نتایج جستجو برای: mild oxidizing agents

تعداد نتایج: 480183  

2001
M. Nasiruddin KHAN Anila SARWAR M. N. KHAN A. SARWAR

The oxidation of ascorbic acid (Vitamin C) is a very important redox reaction, as it has interesting biological properties and is also a powerful reductant. Ascorbic acid is a lactone with a 2,3-endiol group. The enolic group imparts acidity to the molecule; the enol group at position 3 has a pKa of 4.1 and the enol at position 2 has a pKa of 11.6. It is very effective as a reducing agent and i...

2003
LESLIE HELLERMAN MARIE E. PERKINS

Earlier papers from this laboratory have dealt with the activation of urease (1) and of papain (2), with emphasis, particularly, upon reversible inactivations by oxidizing agents and by certain organometallic compounds. This communication describes an investigation of the markedly differing activation chemistry of the enzyme, arginase. There is stressed the conspicuous Ale apparently played by ...

Journal: :The Journal of biological chemistry 1999
M Carballo M Conde R El Bekay J Martín-Nieto M J Camacho J Monteseirín J Conde F J Bedoya F Sobrino

Oxidizing agents are powerful activators of factors responsible for the transcriptional activation of cytokine-encoding genes involved in tissue injury. In this study we show evidence that STAT3 is a transcription factor whose activity is modulated by H2O2 in human lymphocytes, in which endogenous catalase had previously been inhibited. H2O2-induced nuclear translocation of STAT3 to form sequen...

Journal: :Clinical chemistry 1958
S NOBEL D NOBEL

THE LOSS OF MERCURY due to volatilization and incomplete removal of oxidizing agents which destroy dithizone are among the major problems in determining mercury in urine. This paper describes a method by which these difficulties are reduced to a minimum. In actual use, this method has been found efficient in screening large numbers of workers exposed to a mercury hazard. Most methods require a ...

Journal: :Journal of Clinical Biochemistry and Nutrition 2008
Mikinori Kuwabara Taketoshi Asanuma Koichi Niwa Osamu Inanami

Oxidative stress stimulates two opposite signaling pathways leading to cell death and cell survival. Preferential selection of survival signals leads to the protection of cells against damage induced by reactive oxygen species, whereas preferential acceleration of death signals can be used to advantage in tumor therapy with oxidizing agents such as ionizing radiation and anticancer drugs. In vi...

Journal: :Energies 2021

The article presents the results of research on influence enzymatic and oxidizing agents polymers used in drilling mud technology. calcium hypochlorite, urea peroxide, sodium persulfate, amylase cellulase. This allowed us to determine optimal concentrations these order reduce rheological parameters muds. ability enzymes oxidants decompose colloids composition muds was determined basis measureme...

Journal: :Applied and environmental microbiology 1999
S Okabe H Satoh Y Watanabe

We investigated the in situ spatial organization of ammonia-oxidizing and nitrite-oxidizing bacteria in domestic wastewater biofilms and autotrophic nitrifying biofilms by using microsensors and fluorescent in situ hybridization (FISH) performed with 16S rRNA-targeted oligonucleotide probes. The combination of these techniques made it possible to relate in situ microbial activity directly to th...

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