Results 181 to 190 of about 18,634 (212)

Selenomethionine content of candidate reference materials

Fresenius' Journal of Analytical Chemistry, 2001
Selenium has been identified as an antioxidant of importance in the diet. Accurate determination of its chemical forms depends on the availability of suitable reference materials (RMs). Two candidate reference materials for determination of selenomethionine (Semet) in food-related materials, a standard wheat gluten sample (NIST RM 8418 Wheat Gluten ...
W R, Wolf, H, Zainal, B, Yager
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Intestinal Transport of Selenium-75 Selenomethionine

Science, 1962
When measured simultaneously, selenium-75 selenomethionine accumulated identically with sulfur-35 methionine across everted hamster intestinal sacs in the presence of carrier methionine. The apparent K m for L-methionine transport was 0.8 × 10 -3 M , as calculated from
R P, SPENCER, M, BLAU
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Reaction of selenomethionine with o-benzoquinone

Analytical Biochemistry, 1981
Abstract A new reaction of selenomethionine with o-benzoquinone is described. This reaction can be used to distinguish between methionine and selenomethionine.
M N, Gupta, R, Gopinath, K, Raju
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Electrochemical oxidation of selenocystine and selenomethionine

Colloids and Surfaces B: Biointerfaces, 2009
Electrochemical oxidation of selenocystine (SeCys) and selenomethionine (SeMet), on a gold electrode was studied by cyclic voltammetry (CV), rotating disk electrode technique (RDE) and chronocoulometry (CC). In 0.2 mol/L HAc-NaAc (pH=3.90) supporting electrolyte, anodic peak I potential of SeCys and SeMet was 810 mV and 638 mV, respectively, and this ...
Yan, Bai, Tingting, Wang, Ying, Liu, Wenjie, Zheng   +3 more
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Selenomethionine inhibits ultraviolet radiation‐induced p53 transactivation

Photodermatology, Photoimmunology & Photomedicine, 2006
Background: Ultraviolet (UV) radiation damages the cellular DNA of skin cells. In response, wild‐type p53 protein accumulates in irradiated cells and the stabilized and transactivated protein can then induce genes involved in cell cycle arrest in G1, or in the initiation of apoptosis.
Traynor, Nicola J., McKenzie, Roddie C., Beckett, Geoffrey J., Gibbs, Neil K.   +3 more
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Fast chemical synthesis of [75Sel-selenomethionine

International Journal of Radiation Applications and Instrumentation. Part A. Applied Radiation and Isotopes, 1987
A fast chemical synthesis of high specific activity [75Se]L-selenomethionine (10 Ci/mmol--370 GBq/mmol) is described with a view to 73Se labeling and PET studies. The overall radiochemical yield of the preparation is better than 80%. The purification method uses commercially available reverse phase HPLC columns and 9% NaCl as mobile phase.
Plenevaux, Alain, Cantineau, Robert, Guillaume, Marcel, Christiaens, Léon, Tihange, G.   +4 more
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75Se-selenomethionine in hepatic focal lesions

Seminars in Nuclear Medicine, 1972
Abstract The focal lesion of the liver is usually characterized by the absence of the liver's uptake of radioactive scanning agents. In the focal lesion, the incorporation of 75 Se-selenomethionine is related to its vascularity and capacity to metabolize methionine.
E, Kaplan, M, Domingo
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Selenomethionine Se 75 Scanning

JAMA: The Journal of the American Medical Association, 1967
To the Editor:— Toole and Witcofski ( 198 :1219, 1966) reported visualizing a thymoma by photoscanning 24 and 48 hours following injection of selenomethionine Se 75. During the past three years we have performed such photoscans in more than 30 patients with proved primary hyperparathyroidism, and noted uptake in the mediastinum ( Figure).
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Characterization of selenomethionine in proteins

1984
Publisher Summary This chapter discusses the characterization of selenomethionine in proteins. The incorporation of selenium into protein occurs both specifically and nonspecifically. When selenium concentrations approach or exceed those of sulfur, random substitution of selenium for sulfur can occur.
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Rapid oxidation of dl-selenomethionine by peroxynitrite

Free Radical Biology and Medicine, 1996
Peroxynitrite, the reaction product of nitric oxide and superoxide, rapidly oxidizes DL-selenomethionine (MetSe) with overall second-order kinetics, first-order in peroxynitrite and first-order in MetSe. The oxidation of MetSe by peroxynitrite goes by two competing mechanism. The first produces ethylene by what we propose to be a one-electron oxidation
S, Padmaja, G L, Squadrito, J N, Lemercier, R, Cueto, W A, Pryor   +4 more
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