نتایج جستجو برای: zinc metaborate

تعداد نتایج: 73603  

Journal: :Science China. Materials 2021

Oxygen evolution reaction (OER), as the primary anodic reaction, plays a critical role in many electrochemical energy conversion processes. As state-of-the-art OER catalysts, iridium-based materials are largely hindered from practical applications mainly due to extreme scarcity of iridium. Here we demonstrate successful fabrication boron-doped amorphous iridium oxide (IrOx-B) via facile boric a...

Journal: :Advances in nutrition 2013
Wolfgang Maret

The nutritional essentiality of zinc for the growth of living organisms had been recognized long before zinc biochemistry began with the discovery of zinc in carbonic anhydrase in 1939. Painstaking analytical work then demonstrated the presence of zinc as a catalytic and structural cofactor in a few hundred enzymes. In the 1980s, the field again gained momentum with the new principle of "zinc f...

Journal: :Nanoscale 2014
Sarah Triboulet Catherine Aude-Garcia Lucie Armand Adèle Gerdil Hélène Diemer Fabienne Proamer Véronique Collin-Faure Aurélie Habert Jean-Marc Strub Daniel Hanau Nathalie Herlin Marie Carrière Alain Van Dorsselaer Thierry Rabilloud

Two different zinc oxide nanoparticles, as well as zinc ions, are used to study the cellular responses of the RAW 264 macrophage cell line. A proteomic screen is used to provide a wide view of the molecular effects of zinc, and the most prominent results are cross-validated by targeted studies. Furthermore, the alteration of important macrophage functions (e.g. phagocytosis) by zinc is also inv...

Journal: :The Biochemical journal 1980
A O Udom F O Brady

The ability of rat liver zinc-thionein to donate its metal to the apo-enzymes of the zinc enzymes horse liver alcohol dehydrogenase, yeast aldolase, thermolysin, Escherichia coli alkaline phosphatase and bovine erythrocyte carbonic anhydrase was investigated. Zinc-thionein was as good as, or better than, ZnSO(4), Zn(CH(3)CO(2))(2) or Zn(NO(3))(2) in donating its zinc to these apo-enzymes. Apo-(...

Journal: :The Journal of biological chemistry 1998
R S Gitan H Luo J Rodgers M Broderius D Eide

The ZRT1 gene encodes the transporter responsible for high affinity zinc uptake in yeast. ZRT1 is transcribed in zinc-limited cells and its transcription is repressed in zinc-replete cells. In this report, we describe a second, post-translational mechanism that regulates ZRT1 activity. In zinc-limited cells, ZRT1 is a stable, N-glycosylated plasma membrane protein. Exposure to high levels of ex...

2014

Zinc is an essential micronutrient. It plays a role in stabilizing transcription factors in order to maintain normal cellular function. When the concentration of zinc is not regulated within cells, pathological conditions such as cancers, gastrointestinal tract and skin disorders develop. Although dysregulation of cellular zinc results in several pathological conditions, the mechanism of zinc t...

Journal: :The Journal of biological chemistry 1999
L C Costello Y Liu J Zou R B Franklin

The glandular epithelial cells of the human prostate gland have the unique capability and function of accumulating the highest zinc levels of any soft tissue in the body. Zinc accumulation in the prostate is regulated by prolactin and testosterone; however, little information is available concerning the mechanisms associated with zinc accumulation and its regulation in prostate epithelial cells...

Journal: :The Journal of biological chemistry 2005
Uwe Heinz Martin Kiefer Andreas Tholey Hans-Werner Adolph

Extended x-ray absorption fine structure (EXAFS) spectroscopy was combined with thermodynamic and kinetic approaches to investigate zinc binding to a zinc finger (C2H2) and a tetrathiolate (C4) peptide. Both peptides represent structural zinc sites of proteins and rapidly bind a single zinc ion with picomolar dissociation constants. In competition with EDTA the transfer of peptide-bound zinc io...

جانمحمدی, حسین, صحرایی, محمود,

     An experiment was conducted to estimate the bioavailability and evaluation chemical properties of different zinc sources such as zinc sulfate, zinc oxide A, zinc oxide B and Bioplex Zn in broiler chickens fed by semi-puirfeid diets., At first, for chemical and solubility evaluation of different zinc sources in different solvents based on standards methods, 3 samples each containing 1 and 0...

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