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EXPOSITION
06.09.2017 - 29.10.2017
MAISON EUROPÉENNE DE LA PHOTOGRAPHIE
Anne et Patrick Poirier développent une œuvre polymorphe dans laquelle la photographie occupe, dès leurs débuts en 1967, une place aussi centrale que méconnue, au même titre que la sculpture ou l’installation. Au fil des ans et de leurs expérimentations, ils n’ont cessé de développer un corpus d’œuvres, explorant sans a priori et sans limite les possibilités du médium photographique. Cette exposition, qui réunit près de 200 tirages, en propose la première rétrospective.
taken in Conservatory of Flower, San Francisco.
A butterfly is an insect of the order Lepidoptera. Like all Lepidoptera, butterflies are notable for their unusual life cycle with a larval caterpillar stage, an inactive pupal stage, and a spectacular metamorphosis into a familiar and colourful winged adult form. Most species are day-flying so they regularly attract attention. The diverse patterns formed by their brightly coloured wings and their erratic yet graceful flight have made butterfly watching a fairly popular hobby.
Butterflies comprise the true butterflies (superfamily Papilionoidea), the skippers (Superfamily Hesperioidea) and the moth-butterflies (Superfamily Hedyloidea). Butterflies exhibit polymorphism, mimicry and aposematism. Some are known to migrate over large distances. Some butterflies have evolved symbiotic and parasitic relationships with social insects such as ants. Butterflies are important economically as one of the major agents of pollination. In addition, a number of species are pests, because they can damage domestic crops and trees.
Phylogenetic relationship of accessions that recognize ATR1 effector relative to overall Arabidopsis phylogeny. The phylogenetic tree on the left represents the genome-wide relationship between accessions based on small nucleotide polymorphism data as in Figure 1[13]. Arabidopsis accessions capable of recognizing subsets of ATR1 and ATR13 alleles are marked by arrows with the corresponding recognition specificities.
Butterfly, Lepidoptera, agents of pollination and change, often exhibiting polymorphism and mimicry, grow from eggs to caterpillar and then to larva, pupa and butterfly.
Pissenlit, ou dent-de-lion, est un nom vernaculaire ambigu en français. On appelle « pissenlit » diverses plantes à tige généralement creuse et dont l'inflorescence est un capitule plat et jaune. Ce capitule est généralement à fleurons ligulés. C'est la couleur jaune du capitule et sa forme plate qui déterminent généralement l'emploi du nom « pissenlit » pour désigner telle ou telle espèce.
Les pissenlits « véritables » sont des espèces du genre Taraxacum. Des espèces d'autres genres de la famille des Asteraceae peuvent prendre néanmoins ce nom vernaculaire. Il s'agit ainsi d'une espèce collective qui comprend de nombreuses sous-espèces ou espèces distinctes suivant les auteurs qui leur donnent des valeurs taxonomiques inégales en raison du grand polymorphisme des plantes. 250 à 300 sous-espèces (ou espèces distinctes) ont été décrites en France, 1 200 en Europe et près de 2 000 dans le monde.
Extrait de Wikipédia.
Agatized coral from the Tertiary of Georgia, USA.
Parts of Georgia and Florida are known for having geodized, agatized corals. The original coral skeletons were composed of aragonite (CaCO3, calcium carbonate), a polymorph of calcite. The fossil corals have since been silicified and geodized, resulting in chalcedony-lined cavities / vugs.
Thie example is remarkable for its rainbow colors.
Stratigraphy: supposedly from marine sedimentary rocks in the Hawthorn Group, Tertiary
Locality: undisclosed / unrecorded site attributed to the Withlacoochee River, near the Georgia-Florida border, far-southern Georgia, USA
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Info. at:
Diamond from Arkansas, USA. (longest dimension of crystal = ~1.65 centimeters; USNM R2-00, National Museum of Natural History, Smithsonian Institution, Washington D.C., USA; public domain photo provided by the USNM)
A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite chemical composition and having fairly definite physical properties. At its simplest, a mineral is a naturally-occurring solid chemical. Currently, there are over 6100 named and described minerals - about 200 of them are common and about 20 of them are very common. Mineral classification is based on anion chemistry. Major categories of minerals are: elements, sulfides, oxides, halides, carbonates, sulfates, phosphates, and silicates.
Elements are fundamental substances of matter - matter that is composed of the same types of atoms. At present, 118 elements are known (four of them are still unnamed). Of these, 98 occur naturally on Earth (hydrogen to californium). Most of these occur in rocks & minerals, although some occur in very small, trace amounts. Only some elements occur in their native elemental state as minerals.
To find a native element in nature, it must be relatively non-reactive and there must be some concentration process. Metallic, semimetallic (metalloid), and nonmetallic elements are known in their native state.
The element carbon occurs principally in its native state as graphite (C) and diamond (C). Graphite is the common & far less valuable polymorph of carbon. A scarce polymorph of carbon is diamond. The physical properties of diamond and graphite couldn’t be more different, considering they have the same chemistry. Diamond has a nonmetallic, adamantine luster, typically occurs in cubic or octahedral (double-pyramid) crystals, or subspherical to irregularly-shaped masses, and is extremely hard (H≡10). Diamonds can be almost any color, but are typically clearish, grayish, or yellowish. Many diamonds are noticeably fluorescent under black light (ultraviolet light), but the color and intensity of fluorescence varies. Some diamonds are phosphorescent - under certain conditions, they glow for a short interval on their own.
Very rarely, diamond is a rock-forming mineral (see diamondite - www.flickr.com/photos/jsjgeology/14618393527).
The rough diamond seen here is from a Cretaceous-aged lamproite body at Crater of Diamonds State Park in Arkansas. At the site, diamondiferous lamproitic rocks of the Prairie Creek Lamproite are exposed (actually, it’s just a field of rocky dirt). Diamonds are found regularly by tourists. The Prairie Creek Lamproite is an ultramafic pipe that intruded Proterozoic-aged (Grenvillian) basement rocks. Prairie Creek rocks are Cretaceous in age and date to about 106 million years old.
A strange myth has emerged over the years that says Arkansas diamonds are harder than diamonds from elsewhere. This is not true. Diamonds have a hardness of 10 on the Mohs Scale, whether they're from Arkansas or not.
This diamond is somewhat rounded due to magmatic resorption.
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From park signage:
THE “CRATER” PIPE
The “Crater” diamond deposits are the result of a series of volcanic eruptions that carried a diamond-bearing magma called peridotite to the surface. This molten rock slowly cooled, forming a solid, vertical shaft or pipe.
Later, secondary eruptions occurred that shattered much of the peridotite. The fragmented mixture left by the eruptions formed a volcanic breccia that comprises the majority of the searching area. The intrusive peridotite, and a tuff and fine-grained breccia, also formed by the eruptions, cover the remainder of the mine surface.
STRATIGRAPHIC PROFILE
The volcanic eruptions forming the “Crater’s” pipe had to force their way upward through the layers of rock and sediment formed during Paleozoic and Mesozoic times.
Diamonds are located throughout the pipe - from the surface to an undetermined depth (possibly several thousand meters). The mine is simply the exposed surface area of the pipe.
TOPOGRAPHY
Surface features at the “Crater” today reflect the depositional, erosional, and weathering processes which have occurred since the pipe’s formation. Erosional forces, such as wind and water, have erased the original surface features of the pipe and surrounding rock formations.
Most of the exposed volcanic rocks tend to weather rapidly forming soils of various colors. It is in these soils that we find diamonds today.
In 1948, Glen L. Martin leased property to build a diamond processing plant. Martin’s plant operation lasted only eight months after recovering less than 250 carats of diamonds. The original location of the Martin Plant has been preserved. Its location lies just south of the Visitor Center.
DAZZLING DIAMONDS FROM THE CRATER
Over 85,000 Crater diamonds have been found. Each year an average of 600 are found.
1924 - The Uncle Sam, 40.23 carats
1956 - The Star of Arkansas, 15.33 carats
1956 - The Eisenhower, 6.11 carats
1960 - The Gary Moore, 6.43 carats
Over 24,000 diamonds have been found since Crater of Diamonds State Park was established in 1972.
1975 - The Amarillo Starlight, 163.7 carats
1978 - The Lamle Diamond, 8.61 carats
1981 - The Star of Shreveport, 8.82 carats
1986 - The Conell Diamond, 7.95 carats
1990 - The Strawn-Wagner, 3.03 carats
1997 - The Cooper Diamonds, 6.72 & 6.0 carats
1998 - The Dickinson/Stevens, 7.28 carats
An end to a mystery
Since 1906, when John Huddleston discovered the first diamonds in this field, people have wondered what was beneath this green soil surface. Just how deep and how large is this diamond deposit?
From 1990 to 1997, Arkansas State Parks and several international commercial mining companies conducted tests to determine the underground size and shape of the diamond deposit, and to evaluate the grade of diamonds from the mine.
Phase I testing determined that this is the world’s 8th largest diamond deposit, in size and shape. It extends over 660 feet into the earth. In phase II, 210 diamonds totaling 45.7 carats were recovered. This verified that a significant number of diamonds occur within this large deposit. However, the grade was less than commercially profitable at the time and interest in further testing diminished.
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Geologic provenance: Prairie Creek Lamproite (Prairie Creek Pipe), mid-Albian Stage, late Early Cretaceous, ~106 Ma
Locality: Crater of Diamonds State Park, just south of the town of Murfreesboro, Pike County, southwestern Arkansas, USA (34° 01’ 55” to 34° 02’ 05” North latitude, 93° 40’ 18” to 93° 40’ 25” West longitude)
The phylogeny of M. tuberculosis in South East Asia.
Large sequence polymorphisms define six major lineages of M. tuberculosis (A) which are strongly associated with specific geographical regions (B). In Vietnam, three lineages cause the majority of disease: the East Asian/Beijing, the Indo-Oceanic, and the Euro-American (adapted from reference 1). Numercial values in the figure represent regions of deletions (RD) that define each of the lineages.
SPC’s Java training in jaipur programs are so designed to help a student with little or no knowledge of any programming language get comfortable and be able to develop cool applications using this powerful programming language.
Java is a programming language originally developed by James Gosling at Sun Microsystems and released in 1995 as a core component of Sun Microsystems’ Java platform. The language derives much of its syntax from C and C++ but has a simpler object model and fewer low-level facilities. Java applications are typically compiled to byte code (class file) that can run on any Java Virtual Machine (JVM) regardless of computer architecture. This programming language is a general-purpose concurrent class based object oriented programming language, specifically designed to have as few implementation dependencies as possible. It is intended to let application developers “write once, run anywhere”.
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Phylogenetic relationships of Ostrinia moths and sex pheromones.
Minor components of sex pheromones are indicated by an asterisk. O. nubilalis and O. scapulalis exhibit polymorphism in sex pheromones (Z and E types). Z11-14:OAc, E11-14:OAc, Z12-14:OAc, and E12-14:OAc denote (Z)-11-tetradecenyl acetate, (E)-11-tetradecenyl acetate, (Z)-12-tetradecenyl acetate, and (E)-12-tetradecenyl acetate, respectively. The phylogenetic tree was constructed by the neighbor-joining method using mitochondrial COII gene sequences [29].
The bridled form of guillemots is an example of dimorphism characterised by a white circle around the eye and a line extending backwards. It seems that this variant is more cold tolerant than the common one, and because of that there is a latitudinal variation in the percentage of bridling guillemots. In the Isle of May (Scotland), the bridled form represents 5% of the total guillemot population (Harris et al., 2001).
Click here if you are curious about this species.
'Psi' and 'Lambda' tools by Alexa & Aisha
Tool superpowers: 'Psi' Describes the quantum state of an isolated quantum system and 'Lambda' emits all wavelengths of light
Pissenlit, ou dent-de-lion, est un nom vernaculaire ambigu en français. On appelle « pissenlit » diverses plantes à tige généralement creuse et dont l'inflorescence est un capitule plat et jaune. Ce capitule est généralement à fleurons ligulés. C'est la couleur jaune du capitule et sa forme plate qui déterminent généralement l'emploi du nom « pissenlit » pour désigner telle ou telle espèce.
Les pissenlits « véritables » sont des espèces du genre Taraxacum. Des espèces d'autres genres de la famille des Asteraceae peuvent prendre néanmoins ce nom vernaculaire. Il s'agit ainsi d'une espèce collective qui comprend de nombreuses sous-espèces ou espèces distinctes suivant les auteurs qui leur donnent des valeurs taxonomiques inégales en raison du grand polymorphisme des plantes. 250 à 300 sous-espèces (ou espèces distinctes) ont été décrites en France, 1 200 en Europe et près de 2 000 dans le monde.
Extrait de Wikipédia.
''La musique que proposent Tim et Meriadeg est une embarcation vers l’inconnu, le polymorphe et la rêverie. L’issue du périple est aussi incertaine que virtuose, la mécanique des sens est réglée sur intense, les questions fusent et se défont au gré de mille réponses qui coulent de source. On est en mer, sur le dos d’une vague en transhumance ou à terre au milieu des herbes hautes, qu’importe !!!… on est bien.''
Pas besoin de balances pour ce ''tandem acoustique résolu à dénicher et composer des mélodies simples, jolies ; puis jouer, s'en amuser.'' Fort de l'attachement de ces deux musiciens ''aux musiques traditionnelles, vivantes, étonnantes et voyageuses'' il a juste fallu qu'Estelle entame les deux chants qu'elle souhaitait proposer à son public en leur compagnie pour qu'une demi-heure plus tard tout soit en place ...