نتایج جستجو برای: hydrogen peroxide

تعداد نتایج: 151082  

Journal: :Journal of dental hygiene : JDH 2005
Kelly J Silhacek Kristin R Taake

PURPOSE This in vitro experiment studied the effects of sodium bicarbonate and hydrogen peroxide on the cariogenic bacteria Streptococcus mutans through analysis with a spectrophotometer. METHODS The growth of S. mutans was analyzed using seven different environments. Twelve wells in each of the seven rows of a multi-well plate were used to incubate the test materials. In combinations of 10 m...

Journal: :Infection and immunity 1994
T M Alcorn H Y Zheng M R Gunther D J Hassett M S Cohen

Catalase, which catalyzes the reduction of hydrogen peroxide to oxygen and water, is considered the primary defense of Neisseria gonorrhoeae against exogenous hydrogen peroxide. Recent reports have demonstrated drastically different sensitivities of the organism to hydrogen peroxide ranging from greater than 80% survival after challenge with 30 mM hydrogen peroxide to less than 0.001% survival ...

Journal: :environmental health engineering and management 0
sohrab golmohammadi environmental engineering (trends water and wastewater), kurdistan rural water & wastewater co (kamyaran), sanandaj, iran mohammad ahmadpour department of environmental health engineering, school of public health, maragheh university of medical science, maragheh, iran aliakbar mohammadi department of environmental health engineering, school of public health, neyshabur university of medical sciences, neyshabur, iran azim alinejad social determinants in health promotion research center, hormozgan university of medical sciences, bandar abbas, iran nezam mirzaei environmental health research center, kurdistan university of medical sciences, sanandaj, iran mansour ghaderpoori students research committee, shahid beheshti university of medical sciences, tehran, iran

background: the purpose of the present study was to assess the efficiency of ultrasound/hydrogen peroxide processes and ultrasound/hydrogen peroxide/zno nanoparticles in the removal of blue cat 41 dye from aqueous solutions. methods: zno nanoparticles were prepared using the hydrothermal method. variables including ph, concentration of zno nanoparticles, initial dye concentration, concentration...

2017

Honey and hydrogen peroxide are effective antibacterial agents. The antibacterial activity of honey is mainly attributed to hydrogen peroxide generation that is produced in the honey by the activity of the glucose oxidase (GOX) enzyme. Ziziphus Spina Christi and Acacia spp. honey samples were collected for the study. Hydrogen peroxide was measured using a sensitive enzymatic/colorimetric assay....

Journal: :Compendium of continuing education in dentistry 2002
Robert W Gerlach Paul A Sagel Melissa E Jeffers Xiaojie Zhou

This clinical trial compared the effects of hydrogen peroxide concentration and toothbrushing on clinical response to vital bleaching. Tooth bleaching was accomplished with a flexible, polyethylene strip coated with a hydrogen peroxide bleaching gel worn for 30 minutes twice daily over a 14-day period. A total of 36 subjects were randomized to 1 of 3 treatment groups: 5.3% hydrogen peroxide str...

2010
R. Takanami

Ultraviolet photolysis and ultraviolet and hydrogen peroxide oxidation of fourteen commonly used pharmaceutical compounds and two personal care products in mixed solution using low pressure ultraviolet lamp was investigated in laboratory batch experiments. Removal of the compounds followed the first-order reaction kinetic. Three distinct impacts of hydrogen peroxide on ultraviolet and hydrogen ...

2009
Dhruv Grover Daniel Ford Christopher Brown Nicholas Hoe Aysen Erdem Simon Tavaré John Tower

Circadian rhythms in animals are regulated at the level of individual cells and by systemic signaling to coordinate the activities of multiple tissues. The circadian pacemakers have several physiological outputs, including daily locomotor rhythms. Several redox-active compounds have been found to function in regulation of circadian rhythms in cells, however, how particular compounds might be in...

Journal: :Biological & pharmaceutical bulletin 2002
Kazuyuki Hiramoto Tomoko Kida Kiyomi Kikugawa

Experiments with volunteers in Singapore have demonstrated that coffee drinking increases urinary hydrogen peroxide levels (Long, Halliwell, Free Rad. Res., 32, 463-467 (2000)). We re-examined the effect of coffee drinking of healthy Japanese subjects on urinary hydrogen peroxide levels. A cup of brewed or canned coffee commercially available in Japan generated 120-420 micro mol hydrogen peroxi...

Journal: :iranian journal of blood and cancer 0
paul chikezie adaeze akuwudike ferdinard chilaka

background: the aim of the present study was application of haemoglobin absorption spectroscopy as a distinguishing tool for identification of two haemoglobin types-hba and hbs. material and methods: millimolar absorptivities of normal adult haemoglobin (hba) and sickle cell haemoglobin (hbs) were monitored at ph values of 7.2 and 5.0, within the ultra violet and visible spectral range (250-650...

Journal: :jundishapur journal of microbiology 0
pavan kumar pindi department of microbiology, palamuru university, andhra pradesh, india; department of microbiology, palamuru university, andhra pradesh, india. tel: +91-9849327029, fax: +84-52221020 rebba raja srinath department of microbiology, palamuru university, andhra pradesh, india athinarapu shiva shanker department of microbiology, palamuru university, andhra pradesh, india

background identification of novel pathogenic bacteria always has a crucial role in clinical microbiology to defeat uncontrolled diseases. objectives sample preparation platform has been developed for rapid and simple detection of infectious organisms from the point of care diagnostics and molecular manipulation by using three novel genomic dna isolation protocols. materials and methods most of...

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