نتایج جستجو برای: selenium extraction

تعداد نتایج: 180097  

Journal: :Dose-response : a publication of International Hormesis Society 2009
Emily C Chiang Shuren Shen Seema S Kengeri Huiping Xu Gerald F Combs J Steven Morris David G Bostwick David J Waters

Our work in dogs has revealed a U-shaped dose response between selenium status and prostatic DNA damage that remarkably parallels the relationship between dietary selenium and prostate cancer risk in men, suggesting that more selenium is not necessarily better. Herein, we extend this canine work to show that the selenium dose that minimizes prostatic DNA damage also maximizes apoptosis-a cancer...

Journal: :Basic & clinical pharmacology & toxicology 2014
Marita Wallenberg Sougat Misra Mikael Björnstedt

Selenium is an essential trace element with growth-modulating properties. Decades of research clearly demonstrate that selenium compounds inhibit the growth of malignant cells in diverse experimental model systems. However, the growth-modulating and cytotoxic mechanisms are diverse and far from clear. Lately, a remarkable tumour selective cytotoxicity of selenium compounds has been shown, indic...

2015
Mourad Aribi Warda Meziane Salim Habi Yasser Boulatika Hélène Marchandin Jean-Luc Aymeric Laurel L Lenz

BACKGROUND Dietary selenium is of fundamental importance to maintain optimal immune function and enhance immunity during infection. To this end, we examined the effect of selenium on macrophage bactericidal activities against Staphylococcus aureus. METHODS Assays were performed in golden Syrian hamsters and peritoneal macrophages cultured with S. aureus and different concentrations of seleniu...

2015
Anton A. Turanov Robert A. Everley Sandra Hybsier Kostja Renko Lutz Schomburg Steven P. Gygi Dolph L. Hatfield Vadim N. Gladyshev Giovanna Bermano

Selenoproteins are a unique group of proteins that contain selenium in the form of selenocysteine (Sec) co-translationally inserted in response to a UGA codon with the help of cis- and trans-acting factors. Mammalian selenoproteins contain single Sec residues, with the exception of selenoprotein P (SelP) that has 7-15 Sec residues depending on species. Assessing an individual's selenium status ...

2012
Jinsong Zhang Ethan W Taylor Xiaochun Wan Dungeng Peng

BACKGROUND Elemental selenium nanoparticles have emerged as a novel selenium source with the advantage of reduced risk of selenium toxicity. The present work investigated whether heat treatment affects the size, structure, and bioactivity of selenium nanoparticles. METHODS AND RESULTS After a one-hour incubation of solution containing 80 nm selenium particles in a 90°C water bath, the nanopar...

M. Kargar Razi, R. Sarraf Maamoury S. Banihashemi

In this study, selenium was recovered from an industrial dust. After the purification process, the researchers were able to prepare selenium micro powder. The objective of this study was to prepare selenium nano particles by water solution phase method from the micro powders. The results showed that selenium micronized powder and nano particles had high purity. The obtained nanoparticles were t...

Journal: :Current opinion in biotechnology 2009
Elizabeth A H Pilon-Smits Danika L LeDuc

Selenium (Se) is a micronutrient for many organisms but also toxic at higher concentrations. Both selenium deficiency and toxicity are serious problems worldwide. Owing to the similarity of selenium to sulfur, plants readily take up and assimilate selenate via sulfur transporters and enzymes and can even volatilize selenium. Selenium accumulating or volatilizing plants may be used for phytoreme...

Journal: :The Journal of nutrition 1998
C Ip

The article reviews the progress in basic research of selenium and cancer prevention during the past decade. Special emphasis is placed on the following four major areas of discussion: 1) chemical forms of selenium and anticarcinogenic activity; 2) selenium-enriched food; 3) in vitro effects of selenite vs. monomethylated selenium; and 4) aromatic selenium compounds. It is clear that basic rese...

Journal: :Cancer research 2008
Ying Hu Graeme H McIntosh Richard K Le Leu Richard Woodman Graeme P Young

The chemical form and bioavailability of dietary selenium may influence its protectiveness against colorectal cancer. Selenium is readily incorporated into milk proteins by feeding cows with selenized-yeast. This study examined whether a dairy source of organic selenium (as milk proteins) is more effective than a yeast source at inhibiting oncogenesis in carcinogen-treated mice and whether it r...

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