نتایج جستجو برای: hydrogen peroxide

تعداد نتایج: 151082  

Journal: :The Journal of General Physiology 2003
John Williams

1. The velocity of decomposition of hydrogen peroxide by catalase as a function of (a) concentration of catalase, (b) concentration of hydrogen peroxide, (c) hydrogen ion concentration, (d) temperature has been studied in an attempt to correlate these variables as far as possible. It is concluded that the reaction involves primarily adsorption of hydrogen peroxide at the catalase surface. 2. Th...

Journal: :Journal of bacteriology 1982
E H Berglin M B Edlund G K Nyberg J Carlsson

Under anaerobic conditions an exponentially growing culture of Escherichia coli K-12 was exposed to hydrogen peroxide in the presence of various compounds. Hydrogen peroxide (0.1 mM) together with 0.1 mM L-cysteine or L-cystine killed the organisms more rapidly than 10 mM hydrogen peroxide alone. The exposure of E. coli to hydrogen peroxide in the presence of L-cysteine inhibited some of the ca...

2017
Tahereh Rohani

*Corresponding Author: [email protected] Abstract In this work, a new method was developed for the catalytic reduction of hydrogen peroxide at glassy carbon electrode modified with silver nanoparticles and multi-wall carbon nanotubes. Silver incorporated in this modified electrode acted as catalyst to reduce hydrogen peroxide. First, the electrochemical behavior of silver, incorporated in m...

Journal: :International Journal of Nanomedicine 2008
Dongwon Lee Venkata R Erigala Madhuri Dasari Junhua Yu Robert M Dickson Niren Murthy

The overproduction of hydrogen peroxide is implicated in the progress of numerous life-threatening diseases and there is a great need for the development of contrast agents that can detect hydrogen peroxide in vivo. In this communication, we present a new contrast agent for hydrogen peroxide, termed peroxalate micelles, which detect hydrogen peroxide through chemiluminescence, and have the phys...

Journal: :Acta crystallographica. Section C, Crystal structure communications 2012
Alexander G Medvedev Alexey A Mikhaylov Andrei V Churakov Petr V Prikhodchenko Ovadia Lev

Diammonium carbonate hydrogen peroxide monosolvate, 2NH(4)(+)·CO(3)(2-)·H(2)O(2), (I), and dicaesium carbonate hydrogen peroxide trisolvate, 2Cs(+)·CO(3)(2-)·3H(2)O(2), (II), were crystallized from 98% hydrogen peroxide. In (I), the carbonate anions and peroxide solvent molecules are arranged on twofold axes. The peroxide molecules act as donors in only two hydrogen bonds with carbonate groups,...

Journal: :Antimicrobial agents and chemotherapy 1981
G K Nyberg J Carlsson

Peptostreptococcus anaerobius VPI 4330-1 was tested under various conditions for examination of the bactericidal effect of hydrogen peroxide. The cells were most rapidly killed by hydrogen peroxide when they were in the exponential-growth phase. Cooling or starving the cells decreased the bactericidal effect of hydrogen peroxide. The ionophore nigericin and the metal ion chelating agent 2,2'-bi...

Journal: :Infectious Diseases in Obstetrics and Gynecology 1995
Bryan Larsen Sandra White

OBJECTIVE Clinical isolates of Candida were tested for the presence of catalase and susceptibility to hydrogen peroxide. METHODS MIC was tested by broth dilution technique and catalase was determined by a spectrophotometric procedure. RESULTS All 38 strains tested were inhibited by hydrogen peroxide in concentrations ranging from 4.4 to 88 mM/l, with non-albicans isolates generally requirin...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2011
Xiuhui Liu Matthew M Ramsey Xiaole Chen Dipankar Koley Marvin Whiteley Allen J Bard

Quantitative detection of hydrogen peroxide in solution above a Streptococcus gordonii (Sg) bacterial biofilm was studied in real time by scanning electrochemical microscopy (SECM). The concentration of hydrogen peroxide was determined to be 0.7 mM to 1.6 mM in the presence of 10 mM glucose over a period of 2 to 8 h. The hydrogen peroxide production measured was higher near the biofilm surface ...

2015
Yun Mi Lee Mi Jung Kim Youngha Kim Hyeyoung Kim

BACKGROUND The Janus kinase (Jak)/Signal transducers of activated transcription (Stat) pathway is an upstream signaling pathway for NF-κB activation in Helicobacter pylori-induced interleukin (IL)-8 production in gastric epithelial AGS cells. H. pylori activates NADPH oxidase and produces hydrogen peroxide, which activates Jak1/Stat3 in AGS cells. Therefore, hydrogen peroxide may be critical fo...

2011
E. Lee H. Lee Y. K. Kim K. Sohn K. Lee

It is known that hydrogen peroxide interferes with chemical oxygen demand analysis by consuming oxidation agents such as potassium dichromate, thus leading to overestimation of the chemical oxygen demand measurements. The objective of the study was to investigate the effects of hydrogen peroxide interference and to determine true chemical oxygen demand values on interpreting treatment performan...

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