View allAll Photos Tagged selenium
Nikon FM, Nikkor 28mm f/2.8 AI. Orange filter.
Ilford HP5+ @ 400 EI, developed in Ilfotec LC-29 1+29.
Kentmere Fineprint VC Warmtone Semi-Matt paper, developed in Ilford Multigrade 1 + 9 for 90 seconds.
The print was first toned in Harman Selenium 1+3 for 45 seconds, then fully washed, bleached to completion in Potassium Ferricyanide and toned to completion in Fotospeed Sepia.
The intended result of this split-toning was cool dark selenium lower tones with warm brown sepia highlights. What actually happened was that the selenium was too strong and toned all parts of the print which prevented the bleach from having any noticeable effect. I carried on with the sepia anyway, and after drying realised that there had been an effect after all - the print tone had lost the selenium aubergine and taken on a cold blue-black hue. Very nice, even though it does jar slightly with the cream paper base colour. I don't understand what happened, but I like it!
Scanned Silver Gelatin Print
Ilford Multigrade Paper
Triple Band toned in Sepia/ Selenium
Shot with Ansco Rediflex on 620 film
Haven't done any Selenium treatment in a while, thought I'd give it another go.
Suncor Energy Centre on 5th Avenue SW.
Seen at 11.5mm and f/8
Larger Here - farm5.static.flickr.com/4128/5206158462_d8d42dd640_b.jpg
oriental new seagull vc-fb II glossy cooltone,
rollei vintage, selenium 1+1+9, neopan ss, m-hexanon 50/2, hc-110, hexar rf.
Posemètre (cellule sélénium) pour la photo ou le cinéma fabriqué par Dorn, Neustadt / Weinstrasse Plus d'infos.
Un exemplaire plus récent est présenté ici.
Brocante du 3 mars 2013, Montrottier (Rhône)
Another day, another lith print...
Next print in the series. The original print colour was much the same as for 'theme', so I split-toned this in selenium and finished it in gold toner.
Lith print on Foma Nature II 532. Developed in warm Fotospeed LD20, plus old brown. Split-toned in selenium, finished in gold.
Mamiya RB67, Kodak Tri-X 400, Rodinal (1+50).
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The clamoring soldiers on the National War Memorial in Ottawa, Ontario
Original:
Plus-X Pan @ ASA-125 in Kodak Microdol-X
Print:
Ilford MGIV RC - Dektol (1+2) 1' - Selenium (1+4) 5'
Cohort Study Indicates That Selenium May Be Protective
Against Advanced Prostate Cancer
Higher toenail selenium levels were associated with a reduced risk for advanced prostate cancer.
Toenail selenium levels reflect long-term selenium intake.
Further studies in low-selenium populations are required.
WASHINGTON, D.C. — A greater level of toenail selenium was associated with a significant decrease in the risk for advanced prostate cancer, according to data presented at the AACR Annual Meeting 2013, held in Washington, D.C., April 6-10.
“This could mean, based on our data and based on data from other studies, that selenium is a modifiable risk factor of advanced, clinically relevant prostate cancer,” said Milan S. Geybels, M.Sc., a doctoral candidate in cancer epidemiology at Maastricht University, in Maastricht, the Netherlands.
The Netherlands Cohort Study on diet and cancer is a prospective cohort study that includes 58,279 men who were aged 55 to 69 years at entry in September 1986. Geybels and colleagues analyzed data from 898 men who were diagnosed with advanced prostate cancer during 17.3 years of follow-up of the cohort.
According to Geybels, previous studies investigating the association between selenium levels and prostate cancer have yielded varying results. One large clinical trial showed that selenium supplementation had no protective effect, while several prospective, observational studies indicated that higher levels of selenium were associated with a reduced prostate cancer risk, especially for advanced prostate cancer.
“Our study is interesting because we specifically investigated men with advanced prostate cancer, a type of prostate cancer associated with a poorer prognosis,” Geybels said. “Also, while most of the prior research, including the large clinical trial, involved men with moderate-to-high selenium levels, men in The Netherlands Cohort Study have selenium levels that range from low to moderate. This is important because low selenium is expected to be related to a higher disease risk.”
He and his colleagues chose toenail selenium as the study biomarker because it reflects long-term exposure, as opposed to blood, which is best for monitoring recent selenium exposures.
The data revealed that greater levels of toenail selenium were associated with a substantially reduced risk for advanced prostate cancer. Men with the highest toenail selenium levels had a more than 60 percent lower risk for advanced prostate cancer compared with men with the lowest toenail selenium levels.
“Our findings need to be replicated in further prospective studies, with an extended follow-up for the assessment of incident advanced prostate cancer, and with a wide range of toenail selenium that includes low selenium levels,” Geybels said. “If our results can be confirmed, a prevention trial of selenium and prostate cancer in a low-selenium population may be justified.”
# # #
Abstract Number: 3613
Presenter: Milan S. Geybels, M.Sc.
Title: Toenail selenium is associated with a decreased risk of advanced prostate cancer
Authors: Milan S. Geybels1, Bas A.J. Verhage1, Frederik J. van Schooten1, Alexandra Goldbohm2, Piet A. van den Brandt1. 1Maastricht University, Maastricht, Netherlands; 2TNO, Netherlands
Introduction: Selenium status has been associated with a reduced risk of total prostate cancer (PCa) and there is evidence that the association is more pronounced for advanced, clinically relevant PCa. This association, however, has been studied over a relatively narrow range of selenium status and data from low-selenium populations are missing. Most prior studies of selenium status and PCa have used plasma/serum selenium, which reflects recent selenium intake, and few studies have used toenail selenium, which reflects longer exposure time windows.
Methods: We studied the association of toenail selenium and advanced PCa risk in the Netherlands Cohort study, which includes 58,279 men aged 55 to 69 years. The study has a case-cohort design; a random subcohort was sampled at baseline in 1986 and incident advanced (stage III/IV) PCa cases were identified during 17.3 years of follow-up. Hazard ratios (HRs) and 95% confidence intervals (CIs) were estimated using Cox proportional hazards regression models.
Results: The study population included 898 advanced PCa cases and 1,203 subcohort members. The average toenail selenium concentration among subcohort members was 0.549 μg/g (standard deviation: 0.128). Toenail selenium was associated with a reduced risk of advanced PCa and adjusted HRs for increasing quintiles of toenail selenium were 1.00 (reference), 0.69 (95% CI: 0.52, 0.90), 0.45 (95% CI: 0.34, 0.60), 0.32 (95% CI: 0.24, 0.44), and 0.24 (95% CI: 0.17, 0.33) (P for trend 6 to 12 years, and >12 years of follow-up were 0.91 (95% CI: 0.85, 0.98), 0.85 (95% CI: 0.75, 0.96), and 0.77 (95% CI: 0.71, 0.84), respectively.
Conclusion: Toenail selenium was associated with a substantial decrease in risk of advanced PCa, particularly during later follow-up. If our results can be confirmed, a prevention trial of selenium and PCa in a low-selenium population may be justified. Selenium exerts important biological functions through its presence in selenoproteins and genetic variation in the major selenoproteins glutathione peroxidase 1 (GPX1) and selenoprotein P (SEPP1) has been associated with the risk of PCa. In a next analysis, in the same population, we will study the association of common variation in GPX1 and SEPP1 with advanced PCa risk, and we will evaluate SNP-selenium interactions.
Four different models of Guerpillon 1st model Guerlux. Top left probably a pre-series model, covered with leather. No ser# on the meter.
Top right ser# 008** , with acc foot.
Bottom left ser# 02*** , bottom plate with rim.
Bottom right, ser# 03***, top section matted, with acc. foot.
Selenium Toned Print
Shot for the NZ Professional Photographers competition in the 90's. This shot won the Transport Section and got the inside back cover of the big book of the comp
Selenium meter, with the "Color Finder" gadget on the side. Shown with the "rolltop" partly closed - this rolls round to be an incident-light diffuser if you stop at the red marks, or when fully extended, to cover the scale and close the meter.
A better-focused, wider shot of This one; in the original, I just could not persuade the auto-focus to lock on to cell. Here I can focus manually.
Rayleigh's Owl (like Rayleigh's Fish ) is made from glass containing a metal vapour that results in a 'perfect' Rayleigh scatterer. When illuminated in different ways, it can mimic the entire range of twilight colours seen in the sky. The two spectra shown here represent the transmission of light through the whole height of the owl (red line) and the scattered blue light looking sideways close to where the light beam enters the glass (blue line). These represent the setting sun and the blue sky respectively. The spectra also show absorption features due to selenium used to remove the green (iron) tint from high quality glasses.
Note that the rise in the scattering curve shoreward of ~400nm is due to uncorrected straylight in the spectrometer. At the time I made this observation, I did not know how to correct for it. Now I do (April 2015). See the comment from me below.
underpass under the A1(M) just north of Leeds, nr Wetherby
i was having a clear out and thought i'd try this in b&w. used my new toy (Silver Efex Pro) to add some structure and a selenium tone (with a bit of gold in the highlights). would be interesting to see if i could get the same detail straight out of the camera.
Selenium in sandstone from New Mexico, USA. (SDSMT 3909, South Dakota School of Mines and Technology Museum of Geology, Rapid City, South Dakota, USA)
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 4900 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 rock shown above is from a "roll front deposit", in which native selenium occurs along a redox front in fluvial sandstone (see Granger & Santos, 1982).
Stratigraphy & age of host rock: fluvial sandstone, Westwater Canyon Member, Morrison Formation, Upper Jurassic
Locality; Section 23 Mine, Ambrosia Lake Mining District, north of Grants, New Mexico, USA
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Reference cited:
Granger & Santos (1982) - Geology and ore deposits of the Section 23 Mine, Ambrosia Lake District, New Mexico. United States Geological Survey Open-File Report 82-207. 70 pp.
Shen Hao 4x10
Fujinon 210mm W
Adox CHS100
Fomalux 111 in Ilford Warmtone 1+9, Selenium toned
Straight scan from contact print
Shot on Kodak TMax 400iso with a Pentax 6x7 camera.
Negative developed by me, and enlarged on Oriental VC-RC pearl photo paper using 2 different enlargers, one with an 80mm lens and the other with a 50mm.
Special appearance by some unexposed Kodak TMax 100 that I melted a bit with a cigarette lighter.
Dual toning courtesy of Berg sepia tone and selenium toner and some Elmer's rubber cement.
Three different models of the Bewi Electra with shutterspeeds and aperture numbers according to the Leica cameras, 1933-1939, Germany
Rangefinder Kiev 4 (KNEB subtype 2a)
sn# 5922914 with Jupiter-8M (ЮПИТЕР-8M) f/2 50mm sn #5930926
manufactured in 1959 by the Arsenal factory in Kiev (Ukraine)
The selenium light meter still works and is quite accurate!
Contax copy, made in 1959
Subtype 2a rarity: 3 out of 5
© Dirk HR Spennemann 2011, All Rights Reserved
Selenium oxidizes readily when heated on steel loop and the vapor burns in contact with aerated butane flame with a bright blue flame, turning brighter and more purplish with stronger heating, forming acidic fumes of selenium dioxide. Selenium does not continue to burn when the gas flame is removed.
Selenium from Colorado, USA. (public display, Montana Bureau of Mines and Geology Mineral Museum, Butte, Montana, USA)
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 4900 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.
Kallitype
Selenium-Toned on Arches Platine
Sodium Citrate Developer
5x5 Contact Print from Digital Negative
This started life as a horizontal shot, but by croppping out some distracting detail each side, I ended up with a photo that focuses on the couple.
I processed it in Lightroom to give a Selenium tone which seemed to me to compliment the mood.
Mansfield Holiday II pose mètre sélénium Lentille Cinepar 13mm f/1.8
Téléphoto Aux. Lens Gruenex
Raydex wide angle Aux. Deux filtres. Film 8mm Année 1959
Scanned papercopy
Nikon F3
Nikkor 180mm f/2.8 ED Ais
Hp5+
D76 1+1
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Kentmere Fineprint 18X24 Glossy
Focomat V35 with Focotar 50mm f/2,8
Exposed for 4 at f/11 (no filter)
Developed for 90s in Ilford Mg developer
Toned in Selenium 1+10 for 1.5 min (?)
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Selenium butterfly
With identical exposure and development and toning with selenium and gold, highlight details are better but in comparison with the previous one the luminosity has decreased significantly.
Adox Variotone in Eco4812 and alkaline fixer (no wash required before selenium toning)
MT1 Selenium 1+10 3 mins > wash 15 mins
MT10 Gold 4 mins > final wash 15 -20 mins
At this stage not all silver is toned, therefore it would be possible to lighten the image by a short weak bleach followed by fixing (or Farmer´s reducer). After fixing the print will come out much brighter with an intensive blue tone. Instead bleach&fix a toning of the remaining silver with a weak iron toner is an option to change colour and luminosity.