Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 409155
Title Role of "Dehalococcoides" spp. in the anaerobic transformation of Hexachlorobenzene in European rivers
Author(s) Tas, N.; Schraa, G.; Vos, W.M. de; Smidt, H.
Source Applied and Environmental Microbiology 77 (2011)13. - ISSN 0099-2240 - p. 4437 - 4445.
Department(s) Microbiological Laboratory
Publication type Refereed Article in a scientific journal
Publication year 2011
Keyword(s) sp strain cbdb1 - dehalogenase-homologous genes - reductive dechlorination - chlorinated benzenes - enrichment culture - transcriptional regulators - microbial-communities - quantitative pcr - genome sequence - ethenogenes
Abstract The diffuse pollution by chlorinated organic compounds in river basins is a concern, due to their potential adverse effects on human health and the environment. Organohalides, like hexachlorobenzene (HCB), are recalcitrant to aerobic microbial degradation, and "Dehalococcoides" spp. are the only known microorganisms capable of anaerobic transformation of these compounds coupled to their growth. In this study, sediments from four European rivers were studied in order to determine their HCB dechlorination capacities and the role of Dehalococcoides spp. in this process. Only a weak correlation was observed between Dehalococcoides species abundance and HCB transformation rates from different locations. In one of these locations, in the Ebro River sediment, HCB dechlorination could be linked to Dehalococcoides species growth and activity by 16S rRNA-based molecular methods. Furthermore, HCB dechlorination activity in this sediment was found over the full range of ambient temperatures that this sediment can be exposed to during different seasons throughout the year. The sediment contained several reductive dehalogenase (rdh) genes, and analysis of their transcription revealed the dominance of cbrA, previously shown to encode a trichlorobenzene reductive dehalogenase. This study investigated the role of Dehalococcoides spp. in HCB dechlorination in river sediments and evaluated if the current knowledge of rdh genes could be used to assess HCB bioremediation potential
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