Abstracts

Biological sciences

Search abstracts:

Characterization of an H2-utilizing enrichment culture that reductively dechlorinates tetrachloroethene to vinyl chloride and ethene in the absence of methanogenesis and acetogenesis

Article Abstract:

The microbes which dechlorinate tetrachloroethene (or perchloroethylene, PCE) depend on other organisms for their nutrition, as other anaerobes do. An anaerobic H2-PCE enrichment culture, derived from a diluted methanol-PCE culture, dechlorinated PCE to vinyl chloride and ethene. Dechlorination in the presence of H2 requires neither methanol nor acetate as the electron donor and does not produce methane or methanol indicating that methanogenic and acetogenic bacteria are not present. PCE is a major ground water pollutant and it is not degraded by aerobes.

Microbiology, Cultures (Biology), Organic water pollutants, Organic water pollution, Methanobacteriaceae, Methanogens

---

Hydrogen as an electron donor for dechlorination of tetrachloroethene by an anaerobic mixed culture

Article Abstract:

Previous investigations have shown that a methanogenic enrichment culture can dechlorinate high concentrations of tetrachloroethene (PCE) in a PCE-methanol (MeOH) enrichment culture. This high-PCE enrichment culture was further characterized by comparing results fromMeOH- and hydrogen-fed mixed anaerobic cultures amended with selective inhibitors of eubacteria and methanogenesis. The results showed that hydrogen is the direct electron donor for PCE reduction.

Physiological aspects, Bioremediation, Hydrogen, Vinyl chloride

---

Expression of reductive dehalogenase genes in Dehalococcoides ethenogenes strain 195 growing on tetrachloroethene, trichloroethene, or 2,3-dischlorophenol

Article Abstract:

Reverse transcriptase quantitative PCR during growth and reductive dechlorination of tetrachloroethene (PCE), trichloroethene (TCE) or 2,3-dichlorophenol (2,3-DCP) is used to investigate reductive dehalogenase (RD) gene transcript levels in Dehalococcoides ethenogenes strain 195. It shows chlorophenols naturally occur in soils and are good candidates for the original substrates for PceA.

Science & research, Health aspects, Gene expression, Chlorophenols, Reverse transcriptase inhibitors

Similar abstracts:

• Abstracts: Localization of the auxin permease AUX1 suggests two functionally distinct hormone transport pathways operate in the Arabidopsis root apex
• Abstracts: Complete biological reductive transformation of tetrachloroethene to ethane. Transformation of low concentrations of 3-chlorobenzoate by Pseudomonas sp. strain B13: kinetics and residual concentrations
• Abstracts: Microbial degradation of toluene under sulfate-reducing conditions and the influence of iron on the process. Anaerobic degradation of toluene and xylene by aquifer microorgansisms undersulfate-reducing conditions
• Abstracts: Time allocation by greater white-fronted geese: influence of diet, energy reserves and predation. Morphological differences in Pacific coast populations of Greater White-fronted Geese
• Abstracts: Isolation and characterization of a gene from Aspergillus parasiticus associated with the conversion of versicolorin A to sterigmatocystin in aflatoxin biosynthesis

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.