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FP 3400 - TALA FÁCIL ARAMADA COM ESPUMA / E.V.A
Tala aramada
REF.: FP 3400 / 3800
(Necessário dois socorristas)
Cobertas com espuma e E.V.A ou totalmente de E.V.A. Nas cores de padrão universal de Resgate.
SEQÜÊNCIA UNIVERSAL DE PROCEDIMENTO:
1) Orientar a vítima sobre o seu socorro, deixando-a mais calma;
2) Remover qualquer vestimenta, calçado, relógio, objetos de adornos, etc;
3) Escolher a tala correta pela cor, que determina o tamanho para a extremidade a ser imobilizada, de forma que envolva uma articulação acima e o que compõe abaixo.
4) O socorrista nº 1, segura a extremidade do membro afetado, exercendo firme e suave tração longitudinal;
5) O socorrista nº 02, molda as talas de acordo com a necessidade de imobilização;
6) O socorrista nº 02, coloca uma tala embaixo e de cada lado do membro afetado;
7) O socorrista nº 01, manterá a tração suave, enquanto o socorrista nº 02, envolve as talas com ataduras ou bandagens triangulares, no sentido distal para o proximal;
8) Verificar sempre, se há pulso, perfusão periférica, cor e temperatura da vítima;
OBSERVAÇÕES IMPORTANTES:
1) Nem sempre é possível o alinhamento de fraturas. Neste caso, moldar as talas, de acordo com a necessidade de aplicação em cada vítima;
2) No caso de tala moldável em espuma, colocar a face da espuma mais espessa sobre a pele e não a parte da espécie mais fina;
3) No caso de tala moldável em E.V.A não há necessidade deste procedimento, pois o EVA é de igual espessura.
titulo
tala aramada 11 4221-53353 carlos@cwresgate.com.br www.cwresgate.com
keyworks
Tapa aramada,tala imobilizadora,tala para tendinite,tala extensora,tala para joelho,tala gessada,tala para joelho,thaila ayala,talafix
www.youtube.com/watch?v=kB49lQ4xgKg youtube
incorporar no site
Yashica44
Ela usa filme 127 ..
Foto Macro com camera Asahi Pentax + filme Fuji 800 ISO + extensor + lente Macro..
Extensor de señal HDMI a través de fibra óptica multimodo (MM) basada en conectores SC duplex. Permite extender la señal HDMI a una distancia de hasta 300 m a una resolución Full HD de 1080p (1920 x 1080 pixels). Se compone de dos módulos: un emisor y un receptor.
Especificaciones
Transmisión de audio y vídeo digital HDMI a una resolución Full HD de 1080p (1920 x 1080 x 30 bpp a 60 fps).
Compatible HDCP sin necesidad de cable basado en cobre.
Evita las interferencias electro-magnéticas al ser un extensor de fibra óptica.
Producto laser de clase 1 (EN 60825-1).
Cada módulo dispone de un conector HDMI hembra y de 2 x SC hembra.
Requiere cable de fibra óptica duplex multi-modo (MMF) de tipo 50/125um terminado en conectores SC duplex.
Transmisión multimodo a 850 nm.
Distancia máxima de la fibra óptica de 300 m.
Compatible HDMI 1.3b, CEC, HDCP, DDC y detección automática de conexión HDMI.
Requiere fuente de alimentación de 5 VDC en cada módulo (incluidas).
Tamaño de cada módulo: 108 x 104 x 28 mm.
Puede comprarlo en : www.cablematic.es/producto/Extensor-HDMI-por-fibra-optica...
Grasshoppers are insects of the suborder Caelifera within the order Orthoptera, which includes crickets and their allies in the other suborder Ensifera. They are probably the oldest living group of chewing herbivorous insects, dating back to the early Triassic around 250 million years ago. Grasshoppers are typically ground-dwelling insects with powerful hind legs which enable them to escape from threats by leaping vigorously. They are hemimetabolous insects (they do not undergo complete metamorphosis) which hatch from an egg into a nymph or "hopper" which undergoes five moults, becoming more similar to the adult insect at each developmental stage. At high population densities and under certain environmental conditions, some grasshopper species can change colour and behaviour and form swarms. Under these circumstances they are known as locusts.
Insects in the group are plant-eaters, with a few species at times becoming serious pests of cereals, vegetables and pasture, especially when they swarm in their millions as locusts and destroy crops over wide areas. They protect themselves from predators by camouflage; when detected, many species attempt to startle the predator with a brilliantly-coloured wing-flash while jumping and (if adult) launching themselves into the air, usually flying for only a short distance. Other species such as the rainbow grasshopper have warning coloration which deters predators. Grasshoppers are affected by parasites and various diseases, and many predatory creatures feed on both nymphs and adults. The eggs are the subject of attack by parasitoids and predators.
Grasshoppers have had a long relationship with humans. Swarms of locusts can have devastating effects and cause famine, and even in smaller numbers, the insects can be serious pests. They are used as food in countries such as Mexico and Indonesia. They feature in art, symbolism and literature.
CHARACTERISTICS
Grasshoppers have the typical insect body plan of head, thorax and abdomen. The head is held vertically at an angle to the body, with the mouth at the bottom. The head bears a large pair of compound eyes which give all-round vision, three simple eyes which can detect light and dark, and a pair of thread-like antennae that are sensitive to touch and smell. The downward-directed mouthparts are modified for chewing and there are two sensory palps in front of the jaws.
The thorax and abdomen are segmented and have a rigid cuticle made up of overlapping plates composed of chitin. The three fused thoracic segments bear three pairs of legs and two pairs of wings. The forewings, known as tegmina, are narrow and leathery while the hindwings are large and membranous, the veins providing strength. The legs are terminated by claws for gripping. The hind leg is particularly powerful; the femur is robust and has several ridges where different surfaces join and the inner ridges bear stridulatory pegs in some species. The posterior edge of the tibia bears a double row of spines and there are a pair of articulated spurs near its lower end. The interior of the thorax houses the muscles that control the wings and legs.
The abdomen has eleven segments, the first of which is fused to the thorax and contains the tympanal organ and hearing system. Segments two to eight are ring-shaped and joined by flexible membranes. Segments nine to eleven are reduced in size; segment nine bears a pair of cerci and segments ten and eleven house the reproductive organs. Female grasshoppers are normally larger than males, with short ovipositors. The name of the suborder "Caelifera" comes from the Latin and means chisel-bearing, referring to the shape of the ovipositor.
Those species that make easily heard noises usually do so by rubbing a row of pegs on the hind legs against the edges of the forewings (stridulation). These sounds are produced mainly by males to attract females, though in some species the females also stridulate.
Grasshoppers may be confused with Ensifera (crickets, etc.), but they differ in many aspects; these include the number of segments in their antennae and the structure of the ovipositor, as well as the location of the tympanal organ and the methods by which sound is produced. Ensiferans have antennae that can be much longer than the body and have at least 20–24 segments, while caeliferans have fewer segments in their shorter, stouter antennae.
PHYLOGENY
Grasshoppers belong to the suborder Caelifera. Although, "grasshopper" is sometimes used as a common name for the suborder in general, some sources restrict it to the more "advanced" groups. They may be placed in the infraorder Acrididea and have been referred-to as "short-horned grasshoppers" in older texts to distinguish them from the also-obsolete term "long-horned grasshoppers" (now bush-crickets or katydids) with their much longer antennae. The phylogeny of the Caelifera, based on mitochondrial ribosomal RNA of thirty-two taxa in six out of seven superfamilies, is shown as a cladogram. The Ensifera, Caelifera and all the superfamilies of grasshoppers except Pamphagoidea appear to be monophyletic.
In evolutionary terms, the split between the Caelifera and the Ensifera is no more recent than the Permo-Triassic boundary; the earliest insects that are certainly Caeliferans are in the extinct families Locustopseidae and Locustavidae from the early Triassic, roughly 250 million years ago. The group diversified during the Triassic and have remained important plant-eaters from that time to now. The first modern families such as the Eumastacidae, Tetrigidae and Tridactylidae appeared in the Cretaceous, though some insects that might belong to the last two of these groups are found in the early Jurassic. Morphological classification is difficult because many taxa have converged towards a common habitat type; recent taxonomists have concentrated on the internal genitalia, especially those of the male. This information is not available from fossil specimens, and the palaentological taxonomy is founded principally on the venation of the hindwings.
The Caelifera includes some 2,400 valid genera and about 11,000 known species. Many undescribed species probably exist, especially in tropical wet forests. The Caelifera have a predominantly tropical distribution with fewer species known from temperate zones, but most of the superfamilies have representatives worldwide. They are almost exclusively herbivorous and are probably the oldest living group of chewing herbivorous insects.
The most diverse superfamily is the Acridoidea, with around 8,000 species. The two main families in this are the Acrididae (grasshoppers and locusts) with a worldwide distribution, and the Romaleidae (lubber grasshoppers), found chiefly in the New World. The Ommexechidae and Tristiridae are South American, and the Lentulidae, Lithidiidae and Pamphagidae are mainly African. The Pauliniids are nocturnal and can swim or skate on water, and the Lentulids are wingless. Pneumoridae are native to Africa, particularly southern Africa, and are distinguished by the inflated abdomens of the males.
BIOLOGY
DIET AND DIGESTION
Most grasshoppers are polyphagous, eating vegetation from multiple plant sources, but some are omnivorous and also eat animal tissue and animal faeces. In general their preference is for grasses, including many cereals grown as crops. The digestive system is typical of insects, with Malpighian tubules discharging into the midgut. Carbohydrates are digested mainly in the crop, while proteins are digested in the ceca of the midgut. Saliva is abundant but largely free of enzymes, helping to move food and Malpighian secretions along the gut. Some grasshoppers possess cellulase, which by softening plant cell walls makes plant cell contents accessible to other digestive enzymes.
SENSORY ORGANS
Grasshoppers have a typical insect nervous system, and have an extensive set of external sense organs. On the side of the head are a pair of large compound eyes which give a broad field of vision and can detect movement, shape, colour and distance. There are also three simple eyes (ocelli) on the forehead which can detect light intensity, a pair of antennae containing olfactory (smell) and touch receptors, and mouthparts containing gustatory (taste) receptors. At the front end of the abdomen there is a pair of tympanal organs for sound reception. There are numerous fine hairs (setae) covering the whole body that act as mechanoreceptors (touch and wind sensors), and these are most dense on the antennae, the palps (part of the mouth), and on the cerci at the tip of the abdomen. There are special receptors (campaniform sensillae) embedded in the cuticle of the legs that sense pressure and cuticle distortion. There are internal "chordotonal" sense organs specialized to detect position and movement about the joints of the exoskeleton. The receptors convey information to the central nervous system through sensory neurons, and most of these have their cell bodies located in the periphery near the receptor site itself.
CIRCULATION AMD RESPIRATION
Like other insects, grasshoppers have an open circulatory system and their body cavities are filled with haemolymph. A heart-like structure in the upper part of the abdomen pumps the fluid to the head from where it percolates past the tissues and organs on its way back to the abdomen. This system circulates nutrients throughout the body and carries metabolic wastes to be excreted into the gut. Other functions of the haemolymph include wound healing, heat transfer and the provision of hydrostatic pressure, but the circulatory system is not involved in gaseous exchange. Respiration is performed using tracheae, air-filled tubes, which open at the surfaces of the thorax and abdomen through pairs of valved spiracles. Larger insects may need to actively ventilate their bodies by opening some spiracles while others remain closed, using abdominal muscles to expand and contract the body and pump air through the system.
JUMPING
A large grasshopper, such as a locust, can jump about a metre (twenty body lengths) without using its wings; the acceleration peaks at about 20 g. Grasshoppers jump by extending their large back legs and pushing against the substrate (the ground, a twig, a blade of grass or whatever else they are standing on); the reaction force propels them into the air. They jump for several reasons; to escape from a predator, to launch themselves into flight, or simply to move from place to place. For the escape jump in particular there is strong selective pressure to maximize take-off velocity, since this determines the range. This means that the legs must thrust against the ground with both high force and a high velocity of movement. However, a fundamental property of muscle is that it cannot contract with both high force and high velocity at the same time. Grasshoppers overcome this apparent contradiction by using a catapult mechanism to amplify the mechanical power produced by their muscles.
The jump is a three-stage process. First, the grasshopper fully flexes the lower part of the leg (tibia) against the upper part (femur) by activating the flexor tibiae muscle (the back legs of the grasshopper in the top photograph are in this preparatory position). Second, there is a period of co-contraction in which force builds up in the large, pennate extensor tibiae muscle, but the tibia is kept flexed by the simultaneous contraction of the flexor tibiae muscle. The extensor muscle is much stronger than the flexor muscle, but the latter is aided by specializations in the joint that give it a large effective mechanical advantage over the former when the tibia is fully flexed. Co-contraction can last for up to half a second, and during this period the extensor muscle shortens and stores elastic strain energy by distorting stiff cuticular structures in the leg. The extensor muscle contraction is quite slow (almost isometric), which allows it to develop high force (up to 14 N in the desert locust), but because it is slow only low power is needed. The third stage of the jump is the trigger relaxation of the flexor muscle, which releases the tibia from the flexed position. The subsequent rapid tibial extension is driven mainly by the relaxation of the elastic structures, rather than by further shortening of the extensor muscle. In this way the stiff cuticle acts like the elastic of a catapult, or the bow of a bow-and-arrow. Energy is put into the store at low power by slow but strong muscle contraction, and retrieved from the store at high power by rapid relaxation of the mechanical elastic structures.
STRIDULATION
Male grasshoppers spend much of the day stridulating, singing more actively under optimal conditions and being more subdued when conditions are adverse; females also stridulate, but their efforts are insignificant when compared to the males. Late-stage male nymphs can sometimes be seen making stridulatory movements, although they lack the equipment to make sounds, demonstrating the importance of this behavioural trait. The songs are a means of communication; the male stridulation seems to express reproductive maturity, the desire for social cohesion and individual well-being. Social cohesion becomes necessary among grasshoppers because of their ability to jump or fly large distances, and the song can serve to limit dispersal and guide others to favourable habitat. The generalised song can vary in phraseology and intensity, and is modified in the presence of a rival male, and changes again to a courtship song when a female is nearby. In male grasshoppers of the family Pneumoridae, the enlarged abdomen amplifies stridulation.
LIFE CYCLE
In most grasshopper species, conflicts between males over females rarely escalate beyond ritualistic displays. Some exceptions include the chameleon grasshopper (Kosciuscola tristis), where males may fight on top of ovipositing females; engaging in leg grappling, biting, kicking and mounting.
The newly emerged female grasshopper has a preoviposition period of a week or two while she increases in weight and her eggs mature. After mating, the female of most species digs a hole with her ovipositor and lays a batch of eggs in a pod in the ground near food plants, generally in the summer. After laying the eggs, she covers the hole with soil and litter. Some, like the semi-aquatic Cornops aquaticum, deposit the pod directly into plant tissue. The eggs in the pod are glued together with a froth in some species. After a few weeks of development, the eggs of most species in temperate climates go into diapause, and pass the winter in this state. Diapause is broken by a sufficiently low ground temperature, with development resuming as soon as the ground warms above a certain threshold temperature. The embryos in a pod generally all hatch out within a few minutes of each other. They soon shed their membranes and their exoskeletons harden. These first instar nymphs can then jump away from predators.
Grasshoppers undergo incomplete metamorphosis: they repeatedly moult (undergo ecdysis), each instar becoming larger and more like an adult, with the wing-buds increasing in size at each stage. The number of instars varies between species but is often six. After the final moult, the wings are inflated and become fully functional. The migratory grasshopper, Melanoplus sanguinipes, spends about 25 to 30 days as a nymph, depending on sex and temperature, and lives for about 51 days as an adult.
SWARMING
Locusts are the swarming phase of certain species of short-horned grasshoppers in the family Acrididae. Swarming behaviour is a response to overcrowding. Increased tactile stimulation of the hind legs causes an increase in levels of serotonin. This causes the grasshopper to change colour, feed more and breed faster. The transformation of a solitary individual into a swarming one is induced by several contacts per minute over a short period.
Following this transformation, under suitable conditions dense nomadic bands of flightless nymphs known as "hoppers" can occur, producing pheromones which attract the insects to each other. With several generations in a year, the locust population can build up from localised groups into vast accumulations of flying insects known as plagues, devouring all the vegetation they encounter. The largest recorded locust swarm was one formed by the now-extinct Rocky Mountain locust in 1875; the swarm was 2,900 km long and 180 km wide, and one estimate puts the number of locusts involved at 3.5 trillion. An adult desert locust can eat about 2 g of plant material each day, so the billions of insects in a large swarm can be very destructive, stripping all the foliage from plants in an affected area and consuming stems, flowers, fruits, seeds and bark.
PREDATORS, PARASITES D PAHOGENS
Grasshoppers have a wide range of predators at different stages of their lives; eggs are eaten by bee-flies, ground beetles and blister beetles; hoppers and adults are taken by other insects such as ants, robber flies and sphecid wasps, by spiders, and by many birds and small mammals.
The eggs and nymphs are under attack by parasitoids including blow flies, flesh flies, and tachinid flies. External parasites of adults and nymphs include mites. Female grasshoppers parasitised by mites produce fewer eggs and thus have fewer offspring than unaffected individuals.
The grasshopper nematode (Mermis nigrescens) is a long slender worm that infects grasshoppers, living in the insect's hemocoel. Adult worms lay eggs on plants and the host becomes infected when the foliage is eaten. Spinochordodes tellinii and Paragordius tricuspidatus are parasitic worms that infect grasshoppers and alter the behaviour of their hosts. When the worms are sufficiently developed, the grasshopper is persuaded to leap into a nearby body of water where it drowns, thus enabling the parasite to continue with the next stage of its life cycle, which takes place in water.
Grasshoppers are affected by diseases caused by bacteria, viruses, fungi and protozoa. The bacteria Serratia marcescens and Pseudomonas aeruginosa have both been implicated in causing disease in grasshoppers, as has the entomopathogenic fungus Beauveria bassiana. This widespread fungus has been used to control various pest insects around the world, but although it infects grasshoppers, the infection is not usually lethal because basking in the sun has the result of raising the insect's temperature above a threshold tolerated by the fungus. The fungal pathogen Entomophaga grylli is able to influence the behaviour of its grasshopper host, causing it to climb to the top of a plant and cling to the stem as it dies. This ensures wide dispersal of the fungal spores liberated from the corpse.
The fungal pathogen Metarhizium acridum is found in Africa, Australia and Brazil where it has caused epizootics in grasshoppers. It is being investigated for possible use as a microbial insecticide for locust control. The microsporidian fungus Nosema locustae, once considered to be a protozoan, can be lethal to grasshoppers. It has to be consumed by mouth and is the basis for a bait-based commercial microbial pesticide. Various other microsporidians and protozoans are found in the gut.
ANTI-PREDATOR DEFENCES
Grasshoppers exemplify a range of anti-predator adaptations, enabling them to avoid detection, to escape if detected, and in some cases to avoid being eaten if captured. Grasshoppers are often camouflaged to avoid detection by predators that hunt by sight; some species can change their coloration to suit their surroundings.
Several species such as the hooded leaf grasshopper Phyllochoreia ramakrishnai (Eumastacoidea) are detailed mimics of leaves. Stick grasshoppers (Proscopiidae) mimic wooden sticks in form and colouration. Grasshoppers often have deimatic patterns on their wings, giving a sudden flash of bright colours that may startle predators long enough to give time to escape in a combination of jump and flight.
Some species are genuinely aposematic, having both bright warning coloration and sufficient toxicity to dissuade predators. Dictyophorus productus (Pyrgomorphidae) is a "heavy, bloated, sluggish insect" that makes no attempt to hide; it has a bright red abdomen. A Cercopithecus monkey that ate other grasshoppers refused to eat the species. Another species, the rainbow or painted grasshopper of Arizona, Dactylotum bicolor (Acridoidea), has been shown by experiment with a natural predator, the little striped whiptail lizard, to be aposematic
RELATIONSHIP WITH HUMANS
IN ART AND MEDIA
Grasshoppers are occasionally depicted in artworks, such as the Dutch Golden Age painter Balthasar van der Ast's still life oil painting, Flowers in a Vase with Shells and Insects, c. 1630, now in the National Gallery, London, though the insect may be a bush-cricket.
Another orthopteran is found in Rachel Ruysch's still life Flowers in a Vase, c. 1685. The seemingly static scene is animated by a "grasshopper on the table that looks about ready to spring", according to the gallery curator Betsy Wieseman, with other invertebrates including a spider, an ant, and two caterpillars.
Grasshoppers are also featured in cinema. The 1957 film Beginning of the End portrayed giant grasshoppers attacking Chicago.[59] In the 1998 Pixar film A Bug's Life, the heroes are the members of an ant colony, and the lead villain and his henchmen are grasshoppers.
SYMBOLISM
Grasshoppers are sometimes used as symbols, as in Sir Thomas Gresham's gilded grasshopper in Lombard Street, London, dating from 1563;[a] the building was for a while the headquarters of the Guardian Royal Exchange, but the company declined to use the symbol for fear of confusion with the locust.
When grasshoppers appear in dreams, these have been interpreted as symbols of "Freedom, independence, spiritual enlightenment, inability to settle down or commit to decision". Locusts are taken literally to mean devastation of crops in the case of farmers; figuratively as "wicked men and women" for non-farmers; and "Extravagance, misfortune, & ephemeral happiness" by "gypsies".
AS FOOD
In some countries, grasshoppers are used as food. In southern Mexico, grasshoppers, known as chapulines, are eaten in a variety of dishes, such as in tortillas with chilli sauce. Grasshoppers are served on skewers in some Chinese food markets, like the Donghuamen Night Market. Fried grasshoppers (walang goreng) are eaten in the Gunung Kidul Regency, Yogyakarta, Java in Indonesia. In Native America, the Ohlone people burned grassland to herd grasshoppers into pits where they could be collected as food.
It is recorded in the Bible that John the Baptist ate locusts and wild honey (Greek: ἀκρίδες καὶ μέλι ἄγριον, akrídes kaì méli ágrion) while living in the wilderness; attempts have been made to explain the locusts as suitably ascetic vegetarian food such as carob beans, but the plain meaning of ἀκρίδες is the insects.
AS PESTS
Grasshoppers eat large quantities of foliage both as adults and during their development, and can be serious pests of arid land and prairies. Pasture, grain, forage, vegetable and other crops can be affected. Grasshoppers often bask in the sun, and thrive in warm sunny conditions, so drought stimulates an increase in grasshopper populations. A single season of drought is not normally sufficient to stimulate a massive population increase, but several successive dry seasons can do so, especially if the intervening winters are mild so that large numbers of nymphs survive. Although sunny weather stimulates growth, there needs to be an adequate food supply for the increasing grasshopper population. This means that although precipitation is needed to stimulate plant growth, prolonged periods of cloudy weather will slow nymphal development.
Grasshoppers can best be prevented from becoming pests by manipulating their environment. Shade provided by trees will discourage them and they may be prevented from moving onto developing crops by removing coarse vegetation from fallow land and field margins and discouraging luxurious growth beside ditches and on roadside verges. With increasing numbers of grasshoppers, predator numbers may increase, but this seldom happens sufficiently rapidly to have much effect on populations. Biological control is being investigated, and spores of the protozoan parasite Nosema locustae can be used mixed with bait to control grasshoppers, being more effective with immature insects. On a small scale, neem products can be effective as a feeding deterrent and as a disruptor of nymphal development. Insecticides can be used, but adult grasshoppers are difficult to kill, and as they move into fields from surrounding rank growth, crops may soon become reinfested.
Some grasshopper species, like the Chinese rice grasshopper, are a pest in rice paddies. Ploughing exposes the eggs on the surface of the field, to be destroyed by sunshine or eaten by natural enemies. Some eggs may be buried too deeply in the soil for hatching to take place.
Locust plagues can have devastating effects on human populations, causing famines and population upheavals. They are mentioned in both the Koran and the Bible and have also been held responsible for cholera epidemics, resulting from the corpses of locusts drowned in the Mediterranean Sea and decomposing on beaches. The FAO and other organisations monitor locust activity around the world. Timely application of pesticides can prevent nomadic bands of hoppers from forming before dense swarms of adults can build up. Besides conventional control using contact insecticides, biological pest control using the entomopathogenic fungus Metarhizium acridum, which specifically infects grasshoppers, has been used with some success.
IN LITERATURE
The Egyptian word for locust or grasshopper was written snḥm in the consonantal hieroglyphic writing system. The pharaoh Ramesses II compared the armies of the Hittites to locusts: "They covered the mountains and valleys and were like locusts in their multitude."
One of Aesop's Fables, later retold by La Fontaine, is the tale of The Ant and the Grasshopper. The ant works hard all summer, while the grasshopper plays. In winter, the ant is ready but the grasshopper starves. Somerset Maugham's short story "The Ant and the Grasshopper" explores the fable's symbolism via complex framing. Other human weaknesses besides improvidence have become identified with the grasshopper's behaviour. So an unfaithful woman (hopping from man to man) is "a grasshopper" in "Poprygunya", an 1892 short story by Anton Chekhov, and in Jerry Paris's 1969 film The Grasshopper.
In mechanical engineering
The name "Grasshopper" was given to the Aeronca L-3 and Piper L-4 light aircraft, both used for reconnaissance and other support duties in World War II. The name is said to have originated when Major General Innis P. Swift saw a Piper making a rough landing and remarked that it looked like a "damned grasshopper" for its bouncing progress.
Grasshopper beam engines were beam engines pivoted at one end, the long horizontal arm resembling the hind leg of a grasshopper. The type was patented by William Freemantle in 1803.
WIKIPEDIA
Canon eos 350d + anillos extensores + cosina 100mm macro + flash sigma 530 dg
Sin trípode.
Una de las fotos que realicé durante el pasado verano con mi nuevo objetivo para macro.
ISO 400 + f14? + 1/200s
Sin recorte, raw procesado en Gimp, ajustado niveles y curvas, así como clonar alguna mota de suciedad en la flor/sensor.
Cable de extensión de la zapata de flash (hot-shoe). Este cable de extensión TTL de 3m totalmente extendido, permite ubicar el flash speed light en una posición diferente a la misma que la cámara (a 10m de la cámara). Además de la función de disparo de flash, soporta las funciones de control de exposición y luz auxiliar de foco para flash TTL. Cable rizado de 150 cm retraido y de 10 m extendido. En un extremo dispone de zapata flash macho para conexión a la cámara de fotos. En el otro extremo dispone de rosca universal para fijación a soporte y de zapata de flash (hot-shoe) hembra para acoplar el flash. Compatible con cámaras y flash Nikon.
Puede comprarlo en : www.cablematic.es/producto/Cable-TTL-extensor-para-speed-...
www.smore.com/13ebd-wifi-ultra-boost-opiniones
Cómo Completar Un Acabado, un Wi-Fi repetidor Configuración
Wi-Fi repetidor configuración toma solo un un par de minutos. Esto es proporciona su oficina o en el hogar perfecta Wi-Fi la cobertura de la protección. tenga en cuenta que mejor manera de el extensor Wi-Fi está a medio camino entre que región en los cuales el Wi-Fi puzzlingly desaparece, conocido como la zona muerta, y el router. por Tanto, el ancho de banda de la señal y energía aumentar se inmediata o instantánea y probablemente señalado en lugar que no llegar confiable, confiable Wi-Fi gratuita. En el proceso, el Wi-Fi repetidor o el refuerzo de la voluntad automáticamente ampliar la red política, permitiendo a su ordenadores, Tabletas y teléfonos inteligentes a estancia conectado con disminución o disminuido interferencia.
El consejero de Transportes e Infraestructuras de la Comunidad de Madrid, David Pérez, y la ministra de Cultura de Colombia, Angélica Mayolo, han asistido al acto de inauguración de los dos murales, fruto del trabajo de cuatro reconocidos artistas que, desde el pasado 3 de septiembre, han estado trabajando con pintura de vinilo, aerosoles, rodillos, extensores, brochas, pinceles y cintas. El resultado son dos especulares murales que reflejan la riqueza y la diversidad de este país en diferentes ámbitos.
Prótese vaginal (mod. 01). Fabricado em polivinílico atóxico, super macia, os lábios vaginal levemente avermelhados proporciona realidade incomparável, além de contar com massageadores no tubo extensor dando maior sensação e conforto.
PREÇOS E INFORMAÇÕES PELO FLICKREMAIL.
Brinquedinho novo! huhuuuuu
ai ai ai
simplesmente amei essa máquina
valeu o quase um mês de espera
tem tantos pontinhos.......
aaaii to feliz! :D
e essa mesa extensora é tuuuudo de bom!
agora é só trabalhar e trabalhar....
Se alguém encontrá-lo ,resgate por favor .
Avisem IMEDIATAMENTE para que possam buscá-lo.
Contato com Eugenia: (51)98285807 Vivo
(51)9330 7031 Claro (51)8270 1795 Tim
Amigos!
A Eugênia, nossa amiga e protetora nos pede ajuda para encontrar o CASTOR! Ele fugiu!!!
Segue seu relato aflito:
resgatei o Castor dia 18.06.12 e ficou aqui em casa. Um fofo. Combinei com a Eneida
que ele iria para lá ontem dia 19.06. O Táxi dog buscou ele por volta das 19:30.
Eu mesma coloquei o Castor na cx de transporte e ainda coloquei mais um extensor por fora da cx para ele não sair. O Taxi saiu daqui de casa , na Gloria e foi para a Saturnino de Brito pegar uma doação para a Eneida. Até ali , o Castor ainda estava no carro. Só quando chegou em Águas Claras é que ele deu falta do Castor. O Castor puxou a porta para dentro ...nem roeu as cordas.
Não foi culpa de ninguém, infelizmente aconteceu.
Então, é um trajeto bem grande para procurar por ele, da Saturnino até Águas Claras.
A Eneida, ontem a noite fez esse trajeto de volta para ver se encontrava ele na estrada.
Hoje a tarde eu fiz esse trajeto até o centro de Viamão e deixei cartazes em vários lugares.
Eu vou continuar procurando, não vou desistir , mas preciso da ajuda de vcs.
Não desistam por favor. Continuem ajudando. Se puderem , imprimam o cartaz em anexo e
andem com ele na agenda, no carro. Coloquem em pets, postos de gasolina....
Um cão pode caminhar quilômetros por dia e como ele é muito apavorado, pode estar escondido.
Castor fugiu dia 19.06.12
Ele tem cerca de 10kg, é baixinho e compridinho. É muito medroso , tem que chegar
de mansinho nele. Não morde...só tem muito medo. Ele está com cicatrizes no rosto , como mostra a foto, no lado esquerdo.
Se alguém encontra-lo ,resgate por favor .
Me avisem IMEDIATAMENTE que irei busca-lo.
Contato com Eugenia: (51)98285807 Vivo
(51)9330 7031 Claro (51)8270 1795 Tim
Muito obrigada a todos que estão ajudando a divulgar o Castor.
Fiquem com Deus...
Beijos
BOA SORTE EUGÊNIA!!! BOA SORTE CASTOR!!!
Sempre haverá um "queridobixo" admirável e amigo a sua espera. Para tê-lo basta disponibilizar seu coração. Adote essa ideia.
Visite nosso flickr:
www.flickr.com/photos/queridobixo
email:nossoamigobixo@gmail.com - Fone 051- 99 83 05 67 (Porto Alegre)
ou
Um abraço,
Marilu
Eu, TENTANDO fazer uma letrinha em foundation, enquanto a Leka pensava que a mesa extensora da minha máquina de costura seria uma excelente cama.. rs
A Leka é meu xodó, me faz companhia o tempo todo enquanto estou costurando. Otto, o outro gato, gosta mesmo é do barulho do cortador circular.. rs
Beijos!!
While the sun was out I managed to steer my camera between my spider's web's guylines and another, smaller, web nearby.
Like my first photograph of the spider living outside my front window, this view shows the very clear cross arrangement of white spots on the abdomen, that gives the spider its name of Araneus diadematus. You can also make out some of the spider's eyes, both the main pair at the front and those at the side of the head.
The transparent nature of the legs is because there are no bones. A spiders legs are straightened by hydraulic force rather than extensor muscles. This is why dead spiders are always curled up.
That this photo turned out as good as it did is partly luck, given that I had to hold the camera two feet in front of my waist, angled up and facing to my right while leaning over a handrail. Live view came in quite handy!
Original D72_4071_2
Foto tirada com a Voigtländer Vitoret (vide álbum) e filme DM Paradies 200.
Medição e focos feitos feitos no chute, já que a câmera não possui assistências (fotômetro/telêmetro).
Digitalização feita com uma DSLR usando uma objetiva 50mm f/1.8, extensor de 25mm e flash.
Parque Natural de Los Collados del Asón.Valle de Soba (Cantabria).
Olympus E 510 + zuiko 70-300mm + Tubo extensor Zuiko Ex-25
Esta foto se puede criticar.
Spiders (order Araneae) are air-breathing arthropods that have eight legs and chelicerae with fangs that inject venom. They are the largest order of arachnids and rank seventh in total species diversity among all other orders of organisms. Spiders are found worldwide on every continent except for Antarctica, and have become established in nearly every habitat with the exceptions of air and sea colonization. As of November 2015, at least 45,700 spider species, and 114 families have been recorded by taxonomists. However, there has been dissension within the scientific community as to how all these families should be classified, as evidenced by the over 20 different classifications that have been proposed since 1900.
Anatomically, spiders differ from other arthropods in that the usual body segments are fused into two tagmata, the cephalothorax and abdomen, and joined by a small, cylindrical pedicel. Unlike insects, spiders do not have antennae. In all except the most primitive group, the Mesothelae, spiders have the most centralized nervous systems of all arthropods, as all their ganglia are fused into one mass in the cephalothorax. Unlike most arthropods, spiders have no extensor muscles in their limbs and instead extend them by hydraulic pressure.
Their abdomens bear appendages that have been modified into spinnerets that extrude silk from up to six types of glands. Spider webs vary widely in size, shape and the amount of sticky thread used. It now appears that the spiral orb web may be one of the earliest forms, and spiders that produce tangled cobwebs are more abundant and diverse than orb-web spiders. Spider-like arachnids with silk-producing spigots appeared in the Devonian period about 386 million years ago, but these animals apparently lacked spinnerets. True spiders have been found in Carboniferous rocks from 318 to 299 million years ago, and are very similar to the most primitive surviving suborder, the Mesothelae. The main groups of modern spiders, Mygalomorphae and Araneomorphae, first appeared in the Triassic period, before 200 million years ago.
A herbivorous species, Bagheera kiplingi, was described in 2008, but all other known species are predators, mostly preying on insects and on other spiders, although a few large species also take birds and lizards. Spiders use a wide range of strategies to capture prey: trapping it in sticky webs, lassoing it with sticky bolas, mimicking the prey to avoid detection, or running it down. Most detect prey mainly by sensing vibrations, but the active hunters have acute vision, and hunters of the genus Portia show signs of intelligence in their choice of tactics and ability to develop new ones. Spiders' guts are too narrow to take solids, and they liquefy their food by flooding it with digestive enzymes and grinding it with the bases of their pedipalps, as they do not have true jaws.
Male spiders identify themselves by a variety of complex courtship rituals to avoid being eaten by the females. Males of most species survive a few matings, limited mainly by their short life spans. Females weave silk egg-cases, each of which may contain hundreds of eggs. Females of many species care for their young, for example by carrying them around or by sharing food with them. A minority of species are social, building communal webs that may house anywhere from a few to 50,000 individuals. Social behavior ranges from precarious toleration, as in the widow spiders, to co-operative hunting and food-sharing. Although most spiders live for at most two years, tarantulas and other mygalomorph spiders can live up to 25 years in captivity.
While the venom of a few species is dangerous to humans, scientists are now researching the use of spider venom in medicine and as non-polluting pesticides. Spider silk provides a combination of lightness, strength and elasticity that is superior to that of synthetic materials, and spider silk genes have been inserted into mammals and plants to see if these can be used as silk factories. As a result of their wide range of behaviors, spiders have become common symbols in art and mythology symbolizing various combinations of patience, cruelty and creative powers. An abnormal fear of spiders is called arachnophobia.
DESCRIPTION
BODY PLAN
Spiders are chelicerates and therefore arthropods. As arthropods they have: segmented bodies with jointed limbs, all covered in a cuticle made of chitin and proteins; heads that are composed of several segments that fuse during the development of the embryo.[7] Being chelicerates, their bodies consist of two tagmata, sets of segments that serve similar functions: the foremost one, called the cephalothorax or prosoma, is a complete fusion of the segments that in an insect would form two separate tagmata, the head and thorax; the rear tagma is called the abdomen or opisthosoma. In spiders, the cephalothorax and abdomen are connected by a small cylindrical section, the pedicel. The pattern of segment fusion that forms chelicerates' heads is unique among arthropods, and what would normally be the first head segment disappears at an early stage of development, so that chelicerates lack the antennae typical of most arthropods. In fact, chelicerates' only appendages ahead of the mouth are a pair of chelicerae, and they lack anything that would function directly as "jaws". The first appendages behind the mouth are called pedipalps, and serve different functions within different groups of chelicerates.
Spiders and scorpions are members of one chelicerate group, the arachnids. Scorpions' chelicerae have three sections and are used in feeding. Spiders' chelicerae have two sections and terminate in fangs that are generally venomous, and fold away behind the upper sections while not in use. The upper sections generally have thick "beards" that filter solid lumps out of their food, as spiders can take only liquid food. Scorpions' pedipalps generally form large claws for capturing prey, while those of spiders are fairly small appendages whose bases also act as an extension of the mouth; in addition, those of male spiders have enlarged last sections used for sperm transfer.
In spiders, the cephalothorax and abdomen are joined by a small, cylindrical pedicel, which enables the abdomen to move independently when producing silk. The upper surface of the cephalothorax is covered by a single, convex carapace, while the underside is covered by two rather flat plates. The abdomen is soft and egg-shaped. It shows no sign of segmentation, except that the primitive Mesothelae, whose living members are the Liphistiidae, have segmented plates on the upper surface.
Like other arthropods, spiders are coelomates in which the coelom is reduced to small areas round the reproductive and excretory systems. Its place is largely taken by a hemocoel, a cavity that runs most of the length of the body and through which blood flows. The heart is a tube in the upper part of the body, with a few ostia that act as non-return valves allowing blood to enter the heart from the hemocoel but prevent it from leaving before it reaches the front end. However, in spiders, it occupies only the upper part of the abdomen, and blood is discharged into the hemocoel by one artery that opens at the rear end of the abdomen and by branching arteries that pass through the pedicle and open into several parts of the cephalothorax. Hence spiders have open circulatory systems. The blood of many spiders that have book lungs contains the respiratory pigment hemocyanin to make oxygen transport more efficient.
Spiders have developed several different respiratory anatomies, based on book lungs, a tracheal system, or both. Mygalomorph and Mesothelae spiders have two pairs of book lungs filled with haemolymph, where openings on the ventral surface of the abdomen allow air to enter and diffuse oxygen. This is also the case for some basal araneomorph spiders, like the family Hypochilidae, but the remaining members of this group have just the anterior pair of book lungs intact while the posterior pair of breathing organs are partly or fully modified into tracheae, through which oxygen is diffused into the haemolymph or directly to the tissue and organs. The trachea system has most likely evolved in small ancestors to help resist desiccation. The trachea were originally connected to the surroundings through a pair of openings called spiracles, but in the majority of spiders this pair of spiracles has fused into a single one in the middle, and moved backwards close to the spinnerets. Spiders that have tracheae generally have higher metabolic rates and better water conservation. Spiders are ectotherms, so environmental temperatures affect their activity.
FEEDING, DIGESTION AND EXCRETION
Uniquely among chelicerates, the final sections of spiders' chelicerae are fangs, and the great majority of spiders can use them to inject venom into prey from venom glands in the roots of the chelicerae. The family Uloboridae has lost its venom glands, and kills its prey with silk instead. Like most arachnids, including scorpions, spiders have a narrow gut that can only cope with liquid food and spiders have two sets of filters to keep solids out. They use one of two different systems of external digestion. Some pump digestive enzymes from the midgut into the prey and then suck the liquified tissues of the prey into the gut, eventually leaving behind the empty husk of the prey. Others grind the prey to pulp using the chelicerae and the bases of the pedipalps, while flooding it with enzymes; in these species, the chelicerae and the bases of the pedipalps form a preoral cavity that holds the food they are processing.
The stomach in the cephalothorax acts as a pump that sends the food deeper into the digestive system. The mid gut bears many digestive ceca, compartments with no other exit, that extract nutrients from the food; most are in the abdomen, which is dominated by the digestive system, but a few are found in the cephalothorax.
Most spiders convert nitrogenous waste products into uric acid, which can be excreted as a dry material. Malphigian tubules ("little tubes") extract these wastes from the blood in the hemocoel and dump them into the cloacal chamber, from which they are expelled through the anus. Production of uric acid and its removal via Malphigian tubules are a water-conserving feature that has evolved independently in several arthropod lineages that can live far away from water,[14] for example the tubules of insects and arachnids develop from completely different parts of the embryo. However, a few primitive spiders, the sub-order Mesothelae and infra-order Mygalomorphae, retain the ancestral arthropod nephridia ("little kidneys"), which use large amounts of water to excrete nitrogenous waste products as ammonia.
CENTRAL NERVOS SYSTEM
The basic arthropod central nervous system consists of a pair of nerve cords running below the gut, with paired ganglia as local control centers in all segments; a brain formed by fusion of the ganglia for the head segments ahead of and behind the mouth, so that the esophagus is encircled by this conglomeration of ganglia. Except for the primitive Mesothelae, of which the Liphistiidae are the sole surviving family, spiders have the much more centralized nervous system that is typical of arachnids: all the ganglia of all segments behind the esophagus are fused, so that the cephalothorax is largely filled with nervous tissue and there are no ganglia in the abdomen; in the Mesothelae, the ganglia of the abdomen and the rear part of the cephalothorax remain unfused.
Despite the relatively small central nervous system, some spiders (like Portia) exhibit complex behaviour, including the ability to use a trial-and-error approach.
SENSE ORGANS
EYES
Most spiders have four pairs of eyes on the top-front area of the cephalothorax, arranged in patterns that vary from one family to another. The pair at the front are of the type called pigment-cup ocelli ("little eyes"), which in most arthropods are only capable of detecting the direction from which light is coming, using the shadow cast by the walls of the cup. However, the main eyes at the front of spiders' heads are pigment-cup ocelli that are capable of forming images. The other eyes are thought to be derived from the compound eyes of the ancestral chelicerates, but no longer have the separate facets typical of compound eyes. Unlike the main eyes, in many spiders these secondary eyes detect light reflected from a reflective tapetum lucidum, and wolf spiders can be spotted by torch light reflected from the tapeta. On the other hand, jumping spiders' secondary eyes have no tapeta. Some jumping spiders' visual acuity exceeds by a factor of ten that of dragonflies, which have by far the best vision among insects; in fact the human eye is only about five times sharper than a jumping spider's. They achieve this by a telephoto-like series of lenses, a four-layer retina and the ability to swivel their eyes and integrate images from different stages in the scan. The downside is that the scanning and integrating processes are relatively slow.
There are spiders with a reduced number of eyes, of these those with six-eyes are the most numerous and are missing a pair of eyes on the anterior median line, others species have four-eyes and some just two. Cave dwelling species have no eyes, or possess vestigial eyes incapable of sight.
OTHER SENSES
As with other arthropods, spiders' cuticles would block out information about the outside world, except that they are penetrated by many sensors or connections from sensors to the nervous system. In fact, spiders and other arthropods have modified their cuticles into elaborate arrays of sensors. Various touch sensors, mostly bristles called setae, respond to different levels of force, from strong contact to very weak air currents. Chemical sensors provide equivalents of taste and smell, often by means of setae. Pedipalps carry a large number of such setae sensitive to contact chemicals and air-borne smells, such as female pheromones. Spiders also have in the joints of their limbs slit sensillae that detect forces and vibrations. In web-building spiders, all these mechanical and chemical sensors are more important than the eyes, while the eyes are most important to spiders that hunt actively.
Like most arthropods, spiders lack balance and acceleration sensors and rely on their eyes to tell them which way is up. Arthropods' proprioceptors, sensors that report the force exerted by muscles and the degree of bending in the body and joints, are well understood. On the other hand, little is known about what other internal sensors spiders or other arthropods may have.
LOCOMOTION
Each of the eight legs of a spider consists of seven distinct parts. The part closest to and attaching the leg to the cephalothorax is the coxa; the next segment is the short trochanter that works as a hinge for the following long segment, the femur; next is the spider's knee, the patella, which acts as the hinge for the tibia; the metatarsus is next, and it connects the tibia to the tarsus (which may be thought of as a foot of sorts); the tarsus ends in a claw made up of either two or three points, depending on the family to which the spider belongs. Although all arthropods use muscles attached to the inside of the exoskeleton to flex their limbs, spiders and a few other groups still use hydraulic pressure to extend them, a system inherited from their pre-arthropod ancestors. The only extensor muscles in spider legs are located in the three hip joints (bordering the coxa and the trochanter). As a result, a spider with a punctured cephalothorax cannot extend its legs, and the legs of dead spiders curl up. Spiders can generate pressures up to eight times their resting level to extend their legs, and jumping spiders can jump up to 50 times their own length by suddenly increasing the blood pressure in the third or fourth pair of legs. Although larger spiders use hydraulics to straighten their legs, unlike smaller jumping spiders they depend on their flexor muscles to generate the propulsive force for their jumps.
Most spiders that hunt actively, rather than relying on webs, have dense tufts of fine hairs between the paired claws at the tips of their legs. These tufts, known as scopulae, consist of bristles whose ends are split into as many as 1,000 branches, and enable spiders with scopulae to walk up vertical glass and upside down on ceilings. It appears that scopulae get their grip from contact with extremely thin layers of water on surfaces. Spiders, like most other arachnids, keep at least four legs on the surface while walking or running.
SILK PRODUCTION
The abdomen has no appendages except those that have been modified to form one to four (usually three) pairs of short, movable spinnerets, which emit silk. Each spinneret has many spigots, each of which is connected to one silk gland. There are at least six types of silk gland, each producing a different type of silk.
Silk is mainly composed of a protein very similar to that used in insect silk. It is initially a liquid, and hardens not by exposure to air but as a result of being drawn out, which changes the internal structure of the protein. It is similar in tensile strength to nylon and biological materials such as chitin, collagen and cellulose, but is much more elastic. In other words, it can stretch much further before breaking or losing shape.
Some spiders have a cribellum, a modified spinneret with up to 40,000 spigots, each of which produces a single very fine fiber. The fibers are pulled out by the calamistrum, a comb-like set of bristles on the jointed tip of the cribellum, and combined into a composite woolly thread that is very effective in snagging the bristles of insects. The earliest spiders had cribella, which produced the first silk capable of capturing insects, before spiders developed silk coated with sticky droplets. However, most modern groups of spiders have lost the cribellum.
Tarantulas also have silk glands in their feet.
Even species that do not build webs to catch prey use silk in several ways: as wrappers for sperm and for fertilized eggs; as a "safety rope"; for nest-building; and as "parachutes" by the young of some species.
REPRODUCTION AND LIFE CYCLE
Spiders reproduce sexually and fertilization is internal but indirect, in other words the sperm is not inserted into the female's body by the male's genitals but by an intermediate stage. Unlike many land-living arthropods, male spiders do not produce ready-made spermatophores (packages of sperm), but spin small sperm webs on to which they ejaculate and then transfer the sperm to special syringe-like structures, palpal bulbs or palpal organs, borne on the tips of the pedipalps of mature males. When a male detects signs of a female nearby he checks whether she is of the same species and whether she is ready to mate; for example in species that produce webs or "safety ropes", the male can identify the species and sex of these objects by "smell".
Spiders generally use elaborate courtship rituals to prevent the large females from eating the small males before fertilization, except where the male is so much smaller that he is not worth eating. In web-weaving species, precise patterns of vibrations in the web are a major part of the rituals, while patterns of touches on the female's body are important in many spiders that hunt actively, and may "hypnotize" the female. Gestures and dances by the male are important for jumping spiders, which have excellent eyesight. If courtship is successful, the male injects his sperm from the palpal bulbs into the female's genital opening, known as the epigyne, on the underside of her abdomen. Female's reproductive tracts vary from simple tubes to systems that include seminal receptacles in which females store sperm and release it when they are ready.
Males of the genus Tidarren amputate one of their palps before maturation and enter adult life with one palp only. The palps are 20% of male's body mass in this species, and detaching one of the two improves mobility. In the Yemeni species Tidarren argo, the remaining palp is then torn off by the female. The separated palp remains attached to the female's epigynum for about four hours and apparently continues to function independently. In the meantime, the female feeds on the palpless male. In over 60% of cases, the female of the Australian redback spider kills and eats the male after it inserts its second palp into the female's genital opening; in fact, the males co-operate by trying to impale themselves on the females' fangs. Observation shows that most male redbacks never get an opportunity to mate, and the "lucky" ones increase the likely number of offspring by ensuring that the females are well-fed. However, males of most species survive a few matings, limited mainly by their short life spans. Some even live for a while in their mates' webs.
Females lay up to 3,000 eggs in one or more silk egg sacs, which maintain a fairly constant humidity level. In some species, the females die afterwards, but females of other species protect the sacs by attaching them to their webs, hiding them in nests, carrying them in the chelicerae or attaching them to the spinnerets and dragging them along.
Baby spiders pass all their larval stages inside the egg and hatch as spiderlings, very small and sexually immature but similar in shape to adults. Some spiders care for their young, for example a wolf spider's brood cling to rough bristles on the mother's back, and females of some species respond to the "begging" behaviour of their young by giving them their prey, provided it is no longer struggling, or even regurgitate food.
Like other arthropods, spiders have to molt to grow as their cuticle ("skin") cannot stretch. In some species males mate with newly molted females, which are too weak to be dangerous to the males. Most spiders live for only one to two years, although some tarantulas can live in captivity for over 20 years.
SIZE
Spiders occur in a large range of sizes. The smallest, Patu digua from Colombia, are less than 0.37 mm in body length. The largest and heaviest spiders occur among tarantulas, which can have body lengths up to 90 mm and leg spans up to 250 mm.
ECOLOGY AND BEHAVIOR
NON-PREDATORY FEEDING
Although spiders are generally regarded as predatory, the jumping spider Bagheera kiplingi gets over 90% of its food from fairly solid plant material produced by acacias as part of a mutually beneficial relationship with a species of ant.
Juveniles of some spiders in the families Anyphaenidae, Corinnidae, Clubionidae, Thomisidae and Salticidae feed on plant nectar. Laboratory studies show that they do so deliberately and over extended periods, and periodically clean themselves while feeding. These spiders also prefer sugar solutions to plain water, which indicates that they are seeking nutrients. Since many spiders are nocturnal, the extent of nectar consumption by spiders may have been underestimated. Nectar contains amino acids, lipids, vitamins and minerals in addition to sugars, and studies have shown that other spider species live longer when nectar is available. Feeding on nectar avoids the risks of struggles with prey, and the costs of producing venom and digestive enzymes.
Various species are known to feed on dead arthropods (scavenging), web silk, and their own shed exoskeletons. Pollen caught in webs may also be eaten, and studies have shown that young spiders have a better chance of survival if they have the opportunity to eat pollen. In captivity, several spider species are also known to feed on bananas, marmalade, milk, egg yolk and sausages.
METHODS OF CAPTURING PREY
The best-known method of prey capture is by means of sticky webs. Varying placement of webs allows different species of spider to trap different insects in the same area, for example flat horizontal webs trap insects that fly up from vegetation underneath while flat vertical webs trap insects in horizontal flight. Web-building spiders have poor vision, but are extremely sensitive to vibrations.
Females of the water spider Argyroneta aquatica build underwater "diving bell" webs that they fill with air and use for digesting prey, molting, mating and raising offspring. They live almost entirely within the bells, darting out to catch prey animals that touch the bell or the threads that anchor it. A few spiders use the surfaces of lakes and ponds as "webs", detecting trapped insects by the vibrations that these cause while struggling.
Net-casting spiders weave only small webs, but then manipulate them to trap prey. Those of the genus Hyptiotes and the family Theridiosomatidae stretch their webs and then release them when prey strike them, but do not actively move their webs. Those of the family Deinopidae weave even smaller webs, hold them outstretched between their first two pairs of legs, and lunge and push the webs as much as twice their own body length to trap prey, and this move may increase the webs' area by a factor of up to ten. Experiments have shown that Deinopis spinosus has two different techniques for trapping prey: backwards strikes to catch flying insects, whose vibrations it detects; and forward strikes to catch ground-walking prey that it sees. These two techniques have also been observed in other deinopids. Walking insects form most of the prey of most deinopids, but one population of Deinopis subrufa appears to live mainly on tipulid flies that they catch with the backwards strike.
Mature female bolas spiders of the genus Mastophora build "webs" that consist of only a single "trapeze line", which they patrol. They also construct a bolas made of a single thread, tipped with a large ball of very wet sticky silk. They emit chemicals that resemble the pheromones of moths, and then swing the bolas at the moths. Although they miss on about 50% of strikes, they catch about the same weight of insects per night as web-weaving spiders of similar size. The spiders eat the bolas if they have not made a kill in about 30 minutes, rest for a while, and then make new bolas. Juveniles and adult males are much smaller and do not make bolas. Instead they release different pheromones that attract moth flies, and catch them with their front pairs of legs.
The primitive Liphistiidae, the "trapdoor spiders" of the family Ctenizidae and many tarantulas are ambush predators that lurk in burrows, often closed by trapdoors and often surrounded by networks of silk threads that alert these spiders to the presence of prey. Other ambush predators do without such aids, including many crab spiders, and a few species that prey on bees, which see ultraviolet, can adjust their ultraviolet reflectance to match the flowers in which they are lurking. Wolf spiders, jumping spiders, fishing spiders and some crab spiders capture prey by chasing it, and rely mainly on vision to locate prey.Some jumping spiders of the genus Portia hunt other spiders in ways that seem intelligent, outflanking their victims or luring them from their webs. Laboratory studies show that Portia's instinctive tactics are only starting points for a trial-and-error approach from which these spiders learn very quickly how to overcome new prey species. However, they seem to be relatively slow "thinkers", which is not surprising, as their brains are vastly smaller than those of mammalian predators.
Ant-mimicking spiders face several challenges: they generally develop slimmer abdomens and false "waists" in the cephalothorax to mimic the three distinct regions (tagmata) of an ant's body; they wave the first pair of legs in front of their heads to mimic antennae, which spiders lack, and to conceal the fact that they have eight legs rather than six; they develop large color patches round one pair of eyes to disguise the fact that they generally have eight simple eyes, while ants have two compound eyes; they cover their bodies with reflective hairs to resemble the shiny bodies of ants. In some spider species, males and females mimic different ant species, as female spiders are usually much larger than males. Ant-mimicking spiders also modify their behavior to resemble that of the target species of ant; for example, many adopt a zig-zag pattern of movement, ant-mimicking jumping spiders avoid jumping, and spiders of the genus Synemosyna walk on the outer edges of leaves in the same way as Pseudomyrmex. Ant-mimicry in many spiders and other arthropods may be for protection from predators that hunt by sight, including birds, lizards and spiders. However, several ant-mimicking spiders prey either on ants or on the ants' "livestock", such as aphids. When at rest, the ant-mimicking crab spider Amyciaea does not closely resemble Oecophylla, but while hunting it imitates the behavior of a dying ant to attract worker ants. After a kill, some ant-mimicking spiders hold their victims between themselves and large groups of ants to avoid being attacked.
DEFENSE
There is strong evidence that spiders' coloration is camouflage that helps them to evade their major predators, birds and parasitic wasps, both of which have good color vision. Many spider species are colored so as to merge with their most common backgrounds, and some have disruptive coloration, stripes and blotches that break up their outlines. In a few species, such as the Hawaiian happy-face spider, Theridion grallator, several coloration schemes are present in a ratio that appears to remain constant, and this may make it more difficult for predators to recognize the species. Most spiders are insufficiently dangerous or unpleasant-tasting for warning coloration to offer much benefit. However, a few species with powerful venoms, large jaws or irritant hairs have patches of warning colors, and some actively display these colors when threatened.
Many of the family Theraphosidae, which includes tarantulas and baboon spiders, have urticating hairs on their abdomens and use their legs to flick them at attackers. These hairs are fine setae (bristles) with fragile bases and a row of barbs on the tip. The barbs cause intense irritation but there is no evidence that they carry any kind of venom. A few defend themselves against wasps by including networks of very robust threads in their webs, giving the spider time to flee while the wasps are struggling with the obstacles. The golden wheeling spider, Carparachne aureoflava, of the Namibian desert escapes parasitic wasps by flipping onto its side and cartwheeling down sand dunes.
SOZIAL SPIDERS
A few spider species that build webs live together in large colonies and show social behavior, although not as complex as in social insects. Anelosimus eximius (in the family Theridiidae) can form colonies of up to 50,000 individuals. The genus Anelosimus has a strong tendency towards sociality: all known American species are social, and species in Madagascar are at least somewhat social. Members of other species in the same family but several different genera have independently developed social behavior. For example, although Theridion nigroannulatum belongs to a genus with no other social species, T. nigroannulatum build colonies that may contain several thousand individuals that co-operate in prey capture and share food. Other communal spiders include several Philoponella species (family Uloboridae), Agelena consociata (family Agelenidae) and Mallos gregalis (family Dictynidae). Social predatory spiders need to defend their prey against kleptoparasites ("thieves"), and larger colonies are more successful in this. The herbivorous spider Bagheera kiplingi lives in small colonies which help to protect eggs and spiderlings. Even widow spiders (genus Latrodectus), which are notoriously cannibalistic, have formed small colonies in captivity, sharing webs and feeding together.
WEB TYPES
There is no consistent relationship between the classification of spiders and the types of web they build: species in the same genus may build very similar or significantly different webs. Nor is there much correspondence between spiders' classification and the chemical composition of their silks. Convergent evolution in web construction, in other words use of similar techniques by remotely related species, is rampant. Orb web designs and the spinning behaviors that produce them are the best understood. The basic radial-then-spiral sequence visible in orb webs and the sense of direction required to build them may have been inherited from the common ancestors of most spider groups. However, the majority of spiders build non-orb webs. It used to be thought that the sticky orb web was an evolutionary innovation resulting in the diversification of the Orbiculariae. Now, however, it appears that non-orb spiders are a sub-group that evolved from orb-web spiders, and non-orb spiders have over 40% more species and are four times as abundant as orb-web spiders. Their greater success may be because sphecid wasps, which are often the dominant predators of spiders, much prefer to attack spiders that have flat webs.
ORB WEBS
About half the potential prey that hit orb webs escape. A web has to perform three functions: intercepting the prey (intersection), absorbing its momentum without breaking (stopping), and trapping the prey by entangling it or sticking to it (retention). No single design is best for all prey. For example: wider spacing of lines will increase the web's area and hence its ability to intercept prey, but reduce its stopping power and retention; closer spacing, larger sticky droplets and thicker lines would improve retention, but would make it easier for potential prey to see and avoid the web, at least during the day. However, there are no consistent differences between orb webs built for use during the day and those built for use at night. In fact, there is no simple relationship between orb web design features and the prey they capture, as each orb-weaving species takes a wide range of prey.
The hubs of orb webs, where the spiders lurk, are usually above the center, as the spiders can move downwards faster than upwards. If there is an obvious direction in which the spider can retreat to avoid its own predators, the hub is usually offset towards that direction.
Horizontal orb webs are fairly common, despite being less effective at intercepting and retaining prey and more vulnerable to damage by rain and falling debris. Various researchers have suggested that horizontal webs offer compensating advantages, such as reduced vulnerability to wind damage; reduced visibility to prey flying upwards, because of the back-lighting from the sky; enabling oscillations to catch insects in slow horizontal flight. However, there is no single explanation for the common use of horizontal orb webs.
Spiders often attach highly visible silk bands, called decorations or stabilimenta, to their webs. Field research suggests that webs with more decorative bands captured more prey per hour. However, a laboratory study showed that spiders reduce the building of these decorations if they sense the presence of predators.
In 1973, Skylab 3 took two orb-web spiders into space to test their web-spinning capabilities in zero gravity. At first, both produced rather sloppy webs, but they adapted quickly.
Tangleweb spiders (cobweb spiders)
Members of the family Theridiidae weave irregular, tangled, three-dimensional webs, popularly known as cobwebs. There seems to be an evolutionary trend towards a reduction in the amount of sticky silk used, leading to its total absence in some species. The construction of cobwebs is less stereotyped than that of orb-webs, and may take several days.
OTHER TYPES OF WEBS
The Linyphiidae generally make horizontal but uneven sheets, with tangles of stopping threads above. Insects that hit the stopping threads fall onto the sheet or are shaken onto it by the spider, and are held by sticky threads on the sheet until the spider can attack from below.
EVOLUTION
FOSSIL RECORD
Although the fossil record of spiders is considered poor, almost 1000 species have been described from fossils. Because spiders' bodies are quite soft, the vast majority of fossil spiders have been found preserved in amber. The oldest known amber that contains fossil arthropods dates from 130 million years ago in the Early Cretaceous period. In addition to preserving spiders' anatomy in very fine detail, pieces of amber show spiders mating, killing prey, producing silk and possibly caring for their young. In a few cases, amber has preserved spiders' egg sacs and webs, occasionally with prey attached; the oldest fossil web found so far is 100 million years old. Earlier spider fossils come from a few lagerstätten, places where conditions were exceptionally suited to preserving fairly soft tissues.
The oldest known exclusively terrestrial arachnid is the trigonotarbid Palaeotarbus jerami, from about 420 million years ago in the Silurian period, and had a triangular cephalothorax and segmented abdomen, as well as eight legs and a pair of pedipalps. Attercopus fimbriunguis, from 386 million years ago in the Devonian period, bears the earliest known silk-producing spigots, and was therefore hailed as a spider at the time of its discovery. However, these spigots may have been mounted on the underside of the abdomen rather than on spinnerets, which are modified appendages and whose mobility is important in the building of webs. Hence Attercopus and the similar Permian arachnid Permarachne may not have been true spiders, and probably used silk for lining nests or producing egg-cases rather than for building webs. The largest known fossil spider as of 2011 is the araneid Nephila jurassica, from about 165 million years ago, recorded from Daohuogo, Inner Mongolia in China. Its body length is almost 25 mm.
Several Carboniferous spiders were members of the Mesothelae, a primitive group now represented only by the Liphistiidae. The mesothelid Paleothele montceauensis, from the Late Carboniferous over 299 million years ago, had five spinnerets. Although the Permian period 299 to 251 million years ago saw rapid diversification of flying insects, there are very few fossil spiders from this period.
The main groups of modern spiders, Mygalomorphae and Araneomorphae, first appear in the Triassic well before 200 million years ago. Some Triassic mygalomorphs appear to be members of the family Hexathelidae, whose modern members include the notorious Sydney funnel-web spider, and their spinnerets appear adapted for building funnel-shaped webs to catch jumping insects. Araneomorphae account for the great majority of modern spiders, including those that weave the familiar orb-shaped webs. The Jurassic and Cretaceous periods provide a large number of fossil spiders, including representatives of many modern families.
FAMILY TREE
It is now agreed that spiders (Araneae) are monophyletic (i.e., members of a group of organisms that form a clade, consisting of a last common ancestor and all of its descendants). There has been debate about what their closest evolutionary relatives are, and how all of these evolved from the ancestral chelicerates, which were marine animals. The cladogram on the right is based on J. W. Shultz' analysis (2007). Other views include proposals that: scorpions are more closely related to the extinct marine scorpion-like eurypterids than to spiders; spiders and Amblypygi are a monophyletic group. The appearance of several multi-way branchings in the tree on the right shows that there are still uncertainties about relationships between the groups involved.
Arachnids lack some features of other chelicerates, including backward-pointing mouths and gnathobases ("jaw bases") at the bases of their legs; both of these features are part of the ancestral arthropod feeding system. Instead, they have mouths that point forwards and downwards, and all have some means of breathing air. Spiders (Araneae) are distinguished from other arachnid groups by several characteristics, including spinnerets and, in males, pedipalps that are specially adapted for sperm transfer.
TAXONOMY
Spiders are divided into two suborders, Mesothelae and Opisthothelae, of which the latter contains two infraorders, Mygalomorphae and Araneomorphae. Nearly 46,000 living species of spiders (order Araneae) have been identified and are currently grouped into about 114 families and about 4,000 genera by arachnologists.
WIKIPEDIA
I have done a set of Aona skins with a half open mouth showing some teeth. The skin comes with freckles and plain, aswell as the lime makeup and the smokey makeup options. A total of 6 skins.
This skin pack is offered at half price (L150) until the end of April, after which it will be moved to the "frame wall" and marked up to the usual skin pack price of $L300.
Dress: The simple dress fat pack (Tasty) - free (group gift)
4 colors
slurl.com/secondlife/Cite%20des%20Ases/43/219/23
Jacket: Denim blouson light blue (S@bbia) - lucky board
slurl.com/secondlife/Manduca/222/201/74
Shoes: Square-toe Shoes Sophie (G Field) - free (Lucky Board)
slurl.com/secondlife/petit%20pas/108/133/24
Scarf: Winter is Coming Scarf Gift off white (Royal Blue) - 1L
slurl.com/secondlife/Eugene/130/178/25
Tights: Brown tights (Hanamachi) - free
slurl.com/secondlife/SkyBeam%20Tradewinds/192/208/26
Bag: Laurent Bag orange (Puddles) - not free
slurl.com/secondlife/Gannet%20Island/102/196/24
Hair: Chinatsu - more than 6000 group member celebration - (D!va) - group gift
slurl.com/secondlife/CalanDiva/148/157/24
Skin: Sophie Think Pink (Mynerva) - free (Think Pink Hunt)
util acessório que combinado com o separador de liquidos pode limpar todos os vidros de um ambiente sem esforço.
Vem com uma vara telescópica extensora que permite limpeza em janelas e pele de vidro de pé direito duplo.
Lateral patellar retinaculum. Medial patellar retinaculum. Patellar. Soleus. Extensor digitorium longus (muscle). Peroneus longus t. muscle. Peroneus brevis. Peroneus tertius. Tibialis anterior muscle. Extensor hallucis longus. Super extensor retinaculum. Extensor digitorium. Peroneus tertius.
These are the muscles that make up my calf. Yours too.
La llum d'hivern que ve més de costat, la petitesa de les flors i la seva delicadesa. Sembla que s'apilonen per donar-se calor i per mostrar color. Tot plegat fa que un matí pugui ser un magnífic moment, uns instans per a recordar. A més sentint i olorant el mar, quasi a tocar. Això són aquest jardins de Mar i Murtra de Blanes ara l'hivern. Això vam poder viure i sentir aquest dissabte passat.
A la primavera seran un esclat de colors i d'intensitats, però mai perdaran el gust a salobre i mai es deixarà de sentir la musiqueta de les onades en el seu anar i venir constant.
Avui, dilluns, dilluns una mica apagat, pel despatx tots teniem tos i regera de nas, bé el que meny jo. Potser perqué havia olorat el mar, el Mediterrani. No ho sé.
Diuen que demà és el dia dels enamorats, però estan ben equivocats, per a mi és Sant Corte Inglés i para de contar. Si estàs enamorat, si estimes de veritat, no hi ha un dia, sinó que cada instant, cada respiració és una entrada d'aire enamoradís. El millor regal és poder-se mirar als ulls i saber que encara hi ha el foc de l'estimació en el ulls de l'altre i que cada dia és molt bo per a dir t'estimo, si és veritat, si ho vius així. El dia especial és cada moment junts, cada moment que us trobeu a faltar encara que esteu a dues passes de distància. Totes les altres coses només són afectes consumistes per quedar bé quan ja ens hem oblidat de tot. Ho sento però penso així, no hi puc fer més.
Sigui com sigui que sigueu ben feliços i que pogueu seguir estimant per a sempre.
Pessoal aqui ta minha mochila, posta para o efetividade.net onde tem uma promoção muito boa ( www.efetividade.net/2010/07/19/promocao-mochilas/ )
Vamos ao que interessa, a descrição do que tenho lá:
Começando por cima, sempre da esquerda para direita:
Mochila para notebook, com muitas repartições,
um notebook, fonte mouse e claro, uma flanela para limpar a tela (aquela cinza emcima do note). PS: uso uma flanela também quando fecho o note pois o teclado contém certa gordura dos nossos dedos e assim parece que a tela suja menos ;) ;
Papel e caneta (idéias surgem nas horas mais incríveis), textos, modem 3g;
CDs e DVDs com backups e também em branco, caso necessite, remédio para rinite, benjamin (vulgo "t"), além de uma extensão;
O estojo preto carrega de forma organizada todos aqueles pequenos itens que estão pertinho dele:
- Adaptador universal de tomadas
- HUB USB
- Adaptador wireless USB (já foi bem útil)
- extensor de cabo USB
- carregador USB para tomadas
- Adaptador para microSD (para mini e para SD tamanho padrão)
- adaptador microSD - USB ((muitíssimo útil para passar arquivos maiores para o smartphone))
Isso tudo vai dentro do estojo;
Pen drive de 4GB com materiais de serviço e programas que rodam direto do pendrive (como OpenOffice **extremamente útil** ), que fica mais à mão, com backup dos meus documentos;
Na lateral deixo: carregador USB para nokia (smartphone), cabo USB padrão (também serve para carregar o motorola :D ) e mais um adaptador USB x tomada comum
AH! as moedas eu sempre deixo na mochila, caso necessite pegar onibus ou metro na emergência.
La sort d'anar en colla, és que allò que no veus tu ho poden veure els altres.
Aquest bitxo, a l'igual que la flor que l'aguanta, no feia més de dos centímetres.
I el companys, en Martí em va dir, mira que hi ha i ens hi vam posar a la feina.
No tenia el macro, com la gran majoria, però si havia portat un extensor i el 50-200.
Amb aquests instruments vaig poder fer aquesta foto, després d'uns cinc intents que no m'agraden per estar el bitxo o mogut, feia una mica de vent, o desenfocat. Al final vaig aconseguir .ne un parell d'aproximacions acceptablr, que amb una mica de retall és el que esteu veient.
No sé ben bé quin bitxo és, quan el fotografiava amb va semblar una aranya, ara sé que no ho és. Les aranyes tenen vuit potes i aquest en té sis, per tant és un insecte... però ja no sé ben res més.
Ell, l'insecte, es va deixar fotografiar una bona estona, però al final va marxar. Havia estat "popular" una estona, ja tenia els seus minuts de glòria... o no?.
E aí, o que você carrega dentro da sua mochila ou pasta de trabalho? Motivado por uma promoção do Efetividade.net, resolvi contar - e mostrar - aqui o que levo diariamente na minha mochila de trabalho:
- A mochila: uma relativamente confortável mochila da Trilhas e Rumos, que comprei pois tem local acolchoado para notebook mas nao tem cara nenhuma daquelas "mochilas de notebook". Pensando em segurança mesmo. Mas deixa a desejar em relação a número de compartimentos e divisões, deixando algumas coisas desarrumadas lá dentro.
- Caderno, livro, caneta e lapiseira. Sempre os quatro. O caderno para anotações e registros em geral. O livro varia conforme o que tenha q ler na época. Pode ser técnico ou não. Caneta esferográfica azul, simples, "de brinde". E a lapiseira é a minha adorada Pentel P205. Aquela clássica pretinha. Não vivo sem!
- Caixa do modem 3G, uma propaganda gratuita aí pra operadora que aqui em SP não tem me deixado muito na mão. Alí dentro tem o modem e o cabo extensor USB.
- Câmera point-and-shot da Sony, baratinha e fácil de carregar. Sou apaixonado por fotografia, mas essa é exclusiva para trabalho, onde preciso fazer muitos registros fotográficos e em vídeo. abaixo dela está uma capinha com o cabo USB, que quase não uso, pois fiz questão de ter uma câmera que usasse cartão SD, com entrada em praticamente qualquer computador (o meu inclusive).
- Controle remoto para apresentações, com pointer, controle de volume, etc, da Targus.
- Carregador de bateria da câmera.
- Capinha do óculos de sol. Para usar de vez em quando e fazer de conta que estou em Floripa, como nos velhos tempos.
- Barrinha de cereal. Que deveria ser comida de manhã e a tarde. Deveria...
- Case aberto com HD externo da LG, cabo USB e 3 pen drives.
- Carregador do notebook.
- Extensão do carregador do notebook (na caixinha).
- O todo-poderoso notebook, sobre sua case provisória.
- Celular da empresa, iPod confiscado da esposa e meu smartphone.
- USB do iPod, fones de ouvido e headset do smartphone (que agora virou do notebook).
- Estojo com pasta e escova de dentes.
- E escondido num dos bolsos laterais, meu canivete suíço da Victorinox, sempre muito útil!
E você, o que leva na sua mochila? Se der tempo, participe da promoção do Efetividade.net também!
Fazendo alguns testes com a tralha que tenho aqui, descobri que agora eu posso fazer macros 1:1 com a lente a mais ou menos 55 cm do assunto. Basta usar 2 conjuntos de tubo extensor (um kit eos + adaptador M42/Eos + kit M42) junto com a Super Takumar 150 f4. Essa foto por exemplo não seria feita com o kit que normalmente uso, pois a mosca estava em uma folha a uns 2.30m do chão.
Obs: É muito mais difícil para focar com a câmera na mão, preciso urgente de um trilho de foco.
El lunes estuvo divertido!!! Gracias al ánimo y a la propuesta de Camilo, Pablo y Omar para filmar un corto documental de todo el proceso para realizar esta intervención!!!
Igual venia mirando este espacio hace un tiempo sobre Ayacucho con la 41... con la ayuda de mi infalible compañera y el ánimo de estos jóvenes documentalistas el extensor rodó, la brocha lloró y el misterio se evidenció.
Gracias al maestro Antonio Grass.