نتایج جستجو برای: hydrogen peroxide

تعداد نتایج: 151082  

2005
M. J. Loeffler R. A. Baragiola

[1] We report infrared reflectance studies in the laboratory that reveal the state of hydrogen peroxide on Europa. Detailed analysis of the 3.5 mm infrared absorption band for hydrogen peroxide grown in a number of water ice environments shows that, for temperatures and concentrations relevant to Europa (80– 130 K), hydrogen peroxide molecules exist in isolated trimers H2O2.2H2O. If the tempera...

2009
A. Goi M. Trapido N. Kulik

The hydrogen peroxide treatment was able to remediate chlorophenols, polycyclic aromatic hydrocarbons, diesel and transformer oil contaminated soil. Chemical treatment of contaminants adsorbed in peat resulted in lower contaminants’ removal and required higher addition of chemicals than the treatment of contaminants in sand. The hydrogen peroxide treatment was found to be feasible for soil reme...

2015
Mohammad E. Rokaya Khaled Beshr Abeer Hashem Mahram Samah Samir Pedir Kusai Baroudi

Objectives. Extra radicular diffusion of hydrogen peroxide associated with intracoronal teeth bleaching was evaluated. Methods. 108 intact single rooted extracted mandibular first premolars teeth were selected. The teeth were instrumented with WaveOne system and obturated with gutta percha and divided into four groups (n = 27) according to the bleaching materials used. Each main group was divid...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1986
R W Morgan M F Christman F S Jacobson G Storz B N Ames

Hydrogen peroxide treatment induces the synthesis of 30 proteins in Salmonella typhimurium. Five of these proteins are also induced by heat shock, including the highly conserved DnaK protein. The induction of one of these five proteins by heat shock is dependent on oxyR, a positive regulator of hydrogen peroxide-inducible genes, while the induction of the other four by heat shock is oxyR indepe...

Journal: :Environmental Health Perspectives 1986
M Nagao Y Fujita K Wakabayashi H Nukaya T Kosuge T Sugimura

A cup of coffee contains mutagens which produce about 5 X 10(4)-10(5) revertants of Salmonella typhimurium TA 100 without S9 mix. One of the mutagens was identified to be methylglyoxal. Methylglyoxal was present in various beverages such as black tea, whisky, and brandy. Methylglyoxal itself induced tumors in rats when administered by subcutaneous injection. However, the mutagenic properties of...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه پیام نور 1388

چکیده ندارد.

Journal: :journal of nanostructures 0
fariba sadri department of chemistry, payame noor university, tehran, iran ali ramazani department of chemistry, university of zanjan, zanjan, iran hamideh ahankar department of chemistry, abhar branch, islamic azad university, abhar, iran saeid taghavi fardood department of chemistry, university of zanjan, zanjan, iran pegah azimzadeh asiabi department of chemistry, university of zanjan, zanjan, iran mehdi khoobi department of medicinal chemistry, faculty of pharmacy and pharmaceutical sciences research center, tehran university of medical sciences, tehran, iran sang woo joo

nanomagnetic mgfe2o4 is an active, stable, and reusable catalyst for the oxidation of alcohols. the oxidation of various primary and secondary alcohols has been examined and related corresponding products were obtained in good yields. the reactions were carried out in the presence of water as solvent and oxone (at room temperature) or h2o2 (at 60 ºc) as an oxidant. the catalyst was investigated...

Journal: :modares journal of medical sciences: pathobiology 2006
maryam moghtadaei ahmad zavaran hosseini mohammad hossein yadegari

patients afflicted by diabetes mellitus (dm) usually have more infections than those without dm. the course of the infections is also more complicated in this group of patients. one of the possible causes of increased infections prevalence is a deficiency in the immunity. besides some decreased cellular responses in vitro, no disturbances in adaptive immunity in diabetic patients have been desc...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2013
masoud mokhtary masoumeh rastegar niaki

a highly efficient method for the oxidation of aldehydes to carboxylic acids using polyvinylpolypyrrolidone supported - boron trifluoride (pvpp-bf3) in the presence of 35% hydrogen peroxide has been developed in acetonitrile at 60 °c. this procedure cleanly oxidizes variety of aldehydes to the corresponding carboxylic acids. oxidative esterification of benzaldehyde utilizing pvpp-bf3/h2o2(35%) ...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2014
ahmad shaabani nasim ganji mozhdeh seyyedhamzeh hamid mofakham

cellulose sulfuric acid as a bio-polymer based solid catalyst efficiently catalyzes the selectively oxidation of sulfides to sulfoxides and thiols to disulfides using hydrogen peroxide as a green oxidant with good yields at room temperature. the developed method offers a number of advantages such as high selectivity, mild reaction conditions, simple operation, cleaner reaction profiles, low cos...

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