Hexachlorocyclohexane
Mostrando 1-12 de 24 artigos, teses e dissertações.
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1. EVALUATION OF THE HYDROGEOLOGICAL AND CONTAMINATION CONDITIONS OF THE SUBSOIL AT CIDADE DOS MENINOS, RJ / AVALIAÇÃO DE CONDIÇÕES HIDROGEOLÓGICAS E DA CONTAMINAÇÃO DO SUBSOLO POR HCH NA CIDADE DOS MENINOS, RJ
Este trabalho tem por objetivo fazer uma avaliação das condições de contaminação, por hexaclorociclohexano (HCH), do subsolo da área da antiga fábrica de pesticidas, localizada na Cidade dos Meninos, Duque de Caxias. Pretende também caracterizar as condições hidrogeológicas básicas locais. Para isto foi feita amostragem de solo através de sonda
Publicado em: 1998
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2. Degradation of Alpha-, Beta-, and Gamma-Hexachlorocyclohexane by a Soil Bacterium under Aerobic Conditions
A Pseudomonas sp., isolated from sugarcane rhizosphere soil, readily metabolized not only alpha and gamma isomers of hexachlorocyclohexane, but also the thermodynamically more stable beta isomer, under aerobic conditions. Bacterial degradation of the three isomers led to the accumulation of a transitory metabolite and eventual release of covalently linked ch
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3. Two Different Types of Dehalogenases, LinA and LinB, Involved in γ-Hexachlorocyclohexane Degradation in Sphingomonas paucimobilis UT26 Are Localized in the Periplasmic Space without Molecular Processing
γ-Hexachlorocyclohexane (γ-HCH) is one of several highly chlorinated insecticides that cause serious environmental problems. The cellular proteins of a γ-HCH-degrading bacterium, Sphingomonas paucimobilis UT26, were fractionated into periplasmic, cytosolic, and membrane fractions after osmotic shock. Most of two different types of dehalogenase, LinA (γ-h
American Society for Microbiology.
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4. Does lindane (gamma-hexachlorocyclohexane) increase the rapid delayed rectifier outward K+ current (IKr) in frog atrial myocytes?
BioMed Central.
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5. Plasma gamma-hexachlorocyclohexane concentrations in forestry workers exposed to lindane.
Plasma gamma-hexachlorocyclohexane (gamma-HCH) and three urinary trichlorophenols were measured in forestry workers who were engaged in planting seedlings treated with gamma-HCH. These two procedures were assessed as potential biological monitoring methods and the data were compared with reported clinical symptoms. The measurement of plasma gamma-HCH was con
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6. Aerobic biomineralization of alpha-hexachlorocyclohexane in contaminated soil.
The factors identified to be important for the aerobic biodegradation of alpha-hexachlorocyclohexane (alpha-HCH) in a soil slurry are temperature, auxiliary carbon source, substrate concentration, and soil inhomogeneities. Temperatures in the range of 20 to 30 degrees C were determined to be most favorable for biodegradation of alpha-HCH. No alpha-HCH biodeg
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7. Molecular cloning of a Pseudomonas paucimobilis gene encoding a 17-kilodalton polypeptide that eliminates HCl molecules from gamma-hexachlorocyclohexane.
Pseudomonas paucimobilis UT26 is capable of growing on gamma-hexachlorocyclohexane (gamma-HCH). A genomic library of P. paucimobilis UT26 was constructed in Pseudomonas putida by using the broad-host-range cosmid vector pKS13. After 2,300 clones were screened by gas chromatography, 3 clones showing gamma-HCH degradation were detected. A 5-kb fragment from on
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8. Identification and Characterization of Genes Involved in the Downstream Degradation Pathway of γ-Hexachlorocyclohexane in Sphingomonas paucimobilis UT26
Sphingomonas paucimobilis UT26 utilizes γ-hexachlorocyclohexane (γ-HCH) as a sole source of carbon and energy. In our previous study, we cloned and characterized genes that are involved in the conversion of γ-HCH to maleylacetate (MA) via chlorohydroquinone (CHQ) in UT26. In this study, we identified and characterized an MA reductase gene, designated linF
American Society for Microbiology.
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9. Identification of intermediates formed during the degradation of hexachlorocyclohexanes by Clostridium sphenoides.
Washed cell suspensions of Clostridium sphenoides degraded the alpha-isomer of 1,2,3,4,5,6-hexachlorocyclohexane via delta-3,4,5,6-tetrachloro-1-cyclohexene and the gamma-isomer via gamma-3,4,5,6-tetrachloro-1-cyclohexene. Both intermediates were further metabolized to unknown substances. The tetrachlorocyclohexene intermediates were identified by gas chroma
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10. Degradation of lindane by cell-free preparations of Clostridium sphenoides.
Cell-free preparation of Clostridium sphenoides degraded the insecticide lindane, the gamma-isomer of 1,2,3,4,5,6-hexachlorocyclohexane, to the gamma-isomer of 3,4,5,6-tetrachloro-1-cyclohexene. The activity appeared to be associated with the membrane fraction and required reduced glutathione. The tetrachlorocy-clohexene intermediate was further metabolized
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11. Purification and characterization of a haloalkane dehalogenase of a new substrate class from a gamma-hexachlorocyclohexane-degrading bacterium, Sphingomonas paucimobilis UT26.
The linB gene product (LinB), 1,3,4,6-tetrachloro-1,4-cyclohexadiene halidohydrolase, which is involved in the degradation of gamma-hexachlorocyclohexane in Sphingomonas paucimobilis UT26 (Y. Nagata, T. Nariya, R. Ohtomo, M. Fukuda, K. Yano, and M. Takagi, J. Bacteriol. 175:6403-6410, 1993), was overproduced in E. coli and purified to homogeneity. The molecu
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12. Biodegradation of alpha- and beta-hexachlorocyclohexane in a soil slurry under different redox conditions.
Aerobic conditions proved to be best for the microbiol conversion of alpha-hexachlorocyclohexane (alpha-HCH) in a soil slurry. The dry soil contained 400 mg of alpha-HCH per kg. This xenobiotic compound was mineralized within about 18 days at an initial rate of 23 mg/kg of soil per day by the mixed native microbial population of the soil. The only intermedia