نتایج جستجو برای: organophosphorus hydrolase

تعداد نتایج: 26121  

Journal: :Analytical chemistry 1999
R J Russell M V Pishko A L Simonian J R Wild

A simple approach is described for preparing poly-(ethylene glycol) hydrogel materials with encapsulated seminapthofluorescein (SNAFL)-organophosphorus hydrolase enzyme conjugates. Direct determination of enzyme-catalyzed neurotoxin hydrolysis is provided by the self-referencing, pH-sensitive dye SNAFL-1, whose emission spectrum changes at lambda = 550 in response to pH. Using spectrofluorimetr...

Journal: :Biotechnology progress 2006
Katsumi Takayama Shin-ichiro Suye Kouichi Kuroda Mitsuyoshi Ueda Tetsuya Kitaguchi Kouta Tsuchiyama Takeshi Fukuda Wilfred Chen Ashok Mulchandani

The gene encoding organophosphorus hydrolase (OPH) from Flavobacterium species was expressed on the cell surface of Saccharomyces cerevisiae MT8-1 using a glycosylphosphatidylinositol (GPI) anchor linked to the C-terminal region of OPH. Immunofluorescence microscopy confirmed the localization of OPH on the cell surface, and fluorescence intensity measurement of cells revealed that 1.4 x 10(4) m...

Journal: :International Journal of Chemical Engineering 2022

Pesticides are indispensable in today’s agriculture. Methyl-parathion hydrolase (MPH, E.C.3.1.8.1) could hydrolyze organophosphorus pesticides, including methyl-parathion. MPH rehabilitate soil and water resources contaminated by pesticides. However, natural MPHs generally exhibited a low tolerance to high temperatures catalytic efficiency. In this study, we improved the efficiency toward methy...

Journal: :Analytical chemistry 1998
A Mulchandani I Kaneva W Chen

A fiber-optic microbial biosensor suitable for direct measurement of organophosphate nerve agents was developed. The unique features of this novel microbial biosensor were the recombinant Escherichia coli cells expressing the enzyme organophosphorus hydrolase on the cell surface and the optical detection of the products of enzyme-catalyzed organophosphate hydrolysis. The use of cells with the m...

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