Results 131 to 140 of about 118,277 (182)

ALKYLATION OF DNA BY ORGANOPHOSPHORUS PESTICIDES

Acta Pharmacologica et Toxicologica, 1979
Methods for the detection of in vivo alkylation of nucleic acids are discussed. Alkylation of mammalian DNA at N‐7 of guanine provides the most sensitive and least equivocal evidence of methylation by an exogenous chemical or its metabolite. No 7‐methylguanine was detected in the combined DNA from the lungs, livers, hearts, brains, kidneys, testes and ...
M F, Wooder, A S, Wright
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Estrogenicity of Organophosphorus and Pyrethroid Pesticides

Journal of Toxicology and Environmental Health, Part A, 2002
Although organophosphorus and pyrethroid pesticides are considered environmental contaminants, their estrogenic potentials are still ubiquitous and unclear. The present study was undertaken to evaluate the estrogenic activities of nine pesticides (phoxim, malathion, monocrotophos, dimethoate, opunal, fenvalerate, cypermethrin, permethrin, and ...
Haiyan, Chen, Jigao, Xiao, Gang, Hu, Jianwei, Zhou, Hang, Xiao, Xinru, Wang   +5 more
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Biodegradation of organophosphorus pesticides by surface-expressed organophosphorus hydrolase

Nature Biotechnology, 1997
Organophosphorus hydrolase (OPH) was displayed and anchored onto the surface of Escherichia coli using an Lpp-OmpA fusion system. Production of the fusion proteins in membrane fractions was verified by immunoblotting with OmpA antisera. Inclusion of the organophosphorus hydrolase signal sequence was necessary for achieving enzymatic activity on the ...
R D, Richins, I, Kaneva, A, Mulchandani, W, Chen   +3 more
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Determination of organophosphorus pesticides in water

1969
Increasing use of organic chemicals for agricultural purposes has caused great concern in recent years. Rachel Carson (1962) was one of the first to focus public attention on the possible hazards connected with pesticide use. Because of this concern, much work (Dugan et al.
G, Zweig, J M, Devine
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Mammalian toxicology of organophosphorus pesticides

Journal of Toxicology and Environmental Health, 1994
Organophosphorus compounds have been utilized as pesticides for almost five decades. They continue to be used as insecticides, helminthicides, ascaricides, nematocides, and to a lesser degree as fungicides and herbicides. While they have been and continue to be extremely useful in agricultural pest control throughout the world, their extensive use has ...
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Bio-sensing of organophosphorus pesticides: A review

Biosensors and Bioelectronics, 2019
Organophosphorus (OP) pesticides have been used widely as agricultural and household pest control agents for almost five decades and persist in our water resources, fruits, vegetables and processed food as health and environmental hazardous compounds. Thus, detection of these harmful OP pesticides at an ease with high sensitivity and selectivity is the
C.S. Pundir, Ashish Malik, null Preety
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Polyamide layer chromatography of organophosphorus pesticides

Journal of Chromatography A, 1969
Abstract The separation of nineteen organophosphorus pesticides by one-dimensional and two-dimensional chromatography and their detection on polyamide layers were investigated. A comparison was made between the detection limits on polyamide and silica gel layers, and this showed the advantages of polyamide layer chromatography.
K, Nagasawa, H, Yoshidome
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Chirality of organophosphorus pesticides: Analysis and toxicity

Journal of Chromatography B, 2010
Although the importance of chirality in organophosphorus compounds (OPs) is well recognized in relation to their biological effects, as with most chiral pesticides, OPs are generally marketed, used and released to the environment as racemates (i.e., equimolar mixtures of enantiomers).
Mae Grace, Nillos, Jay, Gan, Daniel, Schlenk   +2 more
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Adsorption of Phorate, an Organophosphorus Pesticide, on Vertisol

Archives of Environmental Contamination and Toxicology, 2009
Adsorption of phorate, an organophosphorus pesticide, on a vertisol soil was studied. The resulting data were well described by Freundlich and Langmuir adsorption isotherms. Adsorption was fast and the equilibrium was established within 8 h, which is comparatively less than reported previously.
Radha, Rani, Asha, Juwarkar
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Sulfotepp in diazinon and other organophosphorus pesticides

Bulletin of Environmental Contamination and Toxicology, 1987
The presence of the toxic impurity, sulfotepp (O,O,O',O'tetraethyl dithiopyrophosphate), in technical diazinon has been known since the introduction of diazinon in the marketplace as a broad spectrum insecticide (Martgot and Gysin 1957). Because of i ts tox ic i ty , sulfotepp as an impurity has been implicated in cases of human poisoning (Sovocool et ...
R, Turle, B, Levac
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