Results 261 to 270 of about 96,403 (305)

Selenium Metabolism in Micro-organisms

1993
Publisher Summary Selenium is one of the youngest elements detected to have a biological function. The form used in biological macromolecules (proteins, tRNAs), however, is the -2 oxidation state. Nature has used the chemical property of the selenol group to incorporate it into the active site of oxidoreductases.
J, Heider, A, Böck
openaire   +2 more sources

Pharmacology of synthetic organic selenium compounds

1991
The similarity in the chemical properties of sulfur and selenium has tempted medical chemists for many years to prepare, for comparative purposes, a wide variety of selenium derivatives of sulphur- or oxygen-containing compounds. Because of the widespread use of this chemical comparison, the list of published and/or patented structures of organic ...
M J, Parnham, E, Graf
openaire   +2 more sources

Organic Phosphorus-Selenium Chemistry

2011
The reactivity and application of typical organic P-Se containing compounds, namely, selenotriphosphines SePR3, secondary selenophosphines SePHR2, selenophophates SeP(OR)3, selenophosphonates SeP(OR)2R, selenophosphinates SeP(OR)R2, their derivatives and closely related compounds is described. The usefulness of Woollins’ Reagent in organic synthesis is
Guoxiong Hua, J. Derek Woollins
openaire   +1 more source

Seleno-lactobacillus

Biological Trace Element Research, 1995
Lactic acid bacteria are nonpathogenic bacteria commonly used in food processing. An evaluation was made of the capacity to concentrate selenium in species of Lactobacillus. A selenium concentration of 1 microgram/mL in the culture medium yielded in a bacterial content of 400 micrograms/g dry biomass.
Calomme, Mario, Hu, J., van den Branden, K., vanden Berghe, Dirk   +3 more
openaire   +3 more sources

Speciation of selenium in the mammalian organism

The Analyst, 1998
As almost all of the selenium present in the mammalian organism is protein-bound, speciation is mostly concerned with the determination of the different selenium-containing proteins. Information on their distribution and their concentrations in the different tissues of the rat was obtained by means of tracer procedures which, after application of 75Se ...
D, Behne, C, Hammel, H, Pfeifer, D, Röthlein, H, Gessner, A, Kyriakopoulos   +5 more
openaire   +2 more sources

The organ distribution of selenium in German adults

Biological Trace Element Research, 1988
The selenium concentrations were determined in liver, kidney, skeletal muscle, heart, brain, prostate, testis, bile, lung, and spleen of German traffic accident victims. In addition, the nitrogen and phosphorus contents were determined in the same organs and tissues.
O, Oster, G, Schmiedel, W, Prellwitz
openaire   +2 more sources

[Selenium and the organism].

Casopis lekaru ceskych, 1999
Selenium is an essential trace element for animals. It is biologically active as selenocysteine in the active centre of selenoproteins with enzymatic functions. Incorporation of selenocysteine occurs on the basis of genetic expression and selenium is the only trace element under direct genetic control.
openaire   +1 more source

Zinc-Selenium reagents in organic synthesis

Physical Sciences Reviews, 2018
Abstract Organoselenolates, due to the high polarizability of the chalcogen atoms, are generally weak bases and soft nucleophiles used to introduce in stereoselective and mild way a selenium functionality through substitution or addition reactions.
Claudio Santi, Lucia Capoccia, Bonifacio Monti   +2 more
openaire   +1 more source

Studies on selenium–organic polymer interfaces

Journal of Applied Polymer Science, 1969
AbstractInterfaces of evaporated viterous selenium and various organic polymeric resins of both the thermosetting and thermoplastic type have been studied by ultra‐thin sectioning and transmission electron microscopy techniques. Epoxy, phenoxy, polyamide, butadien–styrene copolymer, vinyl‐toluene–butadiene copolymer, resins as well as polyethylene are ...
Y. S. Chiang, S. W. Ing
openaire   +1 more source

ORGANIC SELENIUM POLYMERS*

Annals of the New York Academy of Sciences, 1972
Y, Okamoto, T, Yano, R, Homsany
openaire   +2 more sources