نتایج جستجو برای: mercuric reductase enzyme

تعداد نتایج: 277764  

Journal: :Applied and environmental microbiology 1994
S Nazaret W H Jeffrey E Saouter R Von Haven T Barkay

The relationship of merA gene expression (specifying the enzyme mercuric reductase) to mercury volatilization in aquatic microbial communities was investigated with samples collected at a mercury-contaminated freshwater pond, Reality Lake, in Oak Ridge, Tenn. Levels of merA mRNA transcripts and the rate of inorganic mercury [Hg(II)] volatilization were related to the concentration of mercury in...

Journal: :iranian journal of parasitology 0
f kheirandish m bandehpour a haghighi f mahboudi m mohebali n mosaffa

background : leishmaniasis is an endemic disease in 88 countries. reports on leishmania drug resistance are growing in number. the mechanism of unresponsiveness against glucantime in iranian cutaneous leishmaniasis has not yet been characterized. to begin the first step in finding an anti- leishmania chemotherapy, we prepared recombinant l. major ptr1 enzyme and characterized its activity by en...

Background: Today, the synthesis of silver nanoparticles is very common due to their many applications in various fields. The synthesis of these nanoparticles is done by means of physical, chemical, or biological methods. However, due to its inexpensive and environmentally friendly features, the biological method is more preferable than the other two methods. Previous research has shown that ni...

Journal: :iranian journal of toxicology 0
kanhiya mahour department of zoology, toxicology laboratory, school of life sciences, khandari campus, dr.b.r ambedkar university agra, agra, india prabhu n saxena department of zoology, toxicology laboratory, school of life sciences, khandari campus, dr.b.r ambedkar university agra, agra, india

background: exposure to any xenobiotic can disturb the metabolic activities of particular organs. hence present study is designed to find changes in hepatic biochemistry, histochemistry and histopathology besides serum enzyme levels after acute and sub-acute treatment with mercuric chloride, a heavy metallic compound, in albino rat (rattus norvegicus). materials & methods: thirty albino rats we...

Journal: :The Journal of Experimental Medicine 1953
James G. Hirsch

Sheep serum and bovine serum contain an enzyme which brings about a rapid oxidative deamination of certain biological amines. This enzyme differs from previously described amine oxidases in several regards and especially in its substrate specificity. Studies thus far indicate that only spermine and the closely related compound spermidine serve as substrates for the enzyme in sheep serum. For th...

2012
Eric S. Boyd Tamar Barkay

Mercuric mercury (Hg[II]) is a highly toxic and mobile element that is likely to have had a pronounced and adverse effect on biology since Earth's oxygenation ∼2.4 billion years ago due to its high affinity for protein sulfhydryl groups, which upon binding destabilize protein structure and decrease enzyme activity, resulting in a decreased organismal fitness. The central enzyme in the microbial...

Journal: :Journal of bacteriology 1987
Y Wang I Mahler H S Levinson H O Halvorson

A 7.9-kilobase (kb) chromosomal fragment was cloned from a mercury-resistant Bacillus sp. In Escherichia coli, in the presence of a second plasmid carrying functional transport genes, resistance to HgCl2 and to phenylmercury acetate (PMA) was expressed. Shortening the cloned fragment to 3.8 kb abolished resistance to PMA but not to HgCl2. In Bacillus subtilis, the 3.8-kb fragment produced mercu...

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