| microbial sulfide oxidation in the oxic-anoxic transition zone of freshwater sediment: involvement of lithoautotrophic magnetospirillum strain j10. | the oxic-anoxic transition zone (oatz) of freshwater sediments, where opposing gradients exist of reduced iron and sulfide with oxygen, creates a suitable environment for microorganisms that derive energy from the oxidation of iron or sulfide. gradient microcosms incubated with freshwater sediment showed rapid microbial turnover of sulfide and oxygen compared with sterile systems. microcosms with fes as a substrate also showed growth at the oatz and subsequent dilution series resulted in the iso ... | 2009 | 19659746 |
| assessment of perchlorate-reducing bacteria in a highly polluted river. | a 1-year monitoring experiment of the sarno river basin was conducted during 2008 to evaluate the overall quality of the water over time and to compare the results with those obtained previously. the physico-chemical and microbiological characteristics of the water course had not changed appreciably with respect to previous determinations, thus emphasizing the major contribution of untreated urban wastewater to the overall pollution of the river. moreover, attention was paid to the perchlorate i ... | 2010 | 20843743 |
| microaerophilic, fe(ii)-dependent growth and fe(ii) oxidation by a dechlorospirillum species. | a species of dechlorospirillum was isolated from an fe(ii)-oxidizing, opposing-gradient-culture enrichment using an inoculum from a circumneutral, freshwater creek that showed copious amounts of fe(iii) (hydr)oxide precipitation. in gradient cultures amended with a redox indicator to visualize the depth of oxygen penetration, dechlorospirillum sp. strain m1 showed fe(ii)-dependent growth at the oxic-anoxic interface and was unable to utilize sulfide as an alternate electron donor. the bacterium ... | 2011 | 21410510 |
| shifts in root-associated microbial communities of typha latifolia growing in naphthenic acids and relationship to plant health. | naphthenic acids (nas) are a complex mixture of organic acid compounds released during the extraction of crude oil from oil sands operations. the accumulation of toxic nas in tailings pond water (tpw) is of significant environmental concern, and phytoremediation using constructed wetlands is one remediation option being assessed. since root-associated microorganisms are an important factor during phytoremediation of organic compounds, this study investigated the impact of nas on the microbial co ... | 2010 | 21166345 |
| oxygen and chlorine isotopic fractionation during perchlorate biodegradation: laboratory results and implications for forensics and natural attenuation studies. | perchlorate is a widespread environmental contaminant having both anthropogenic and natural sources. stable isotope ratios of o and cl in a given sample of perchlorate may be used to distinguish its source(s). isotopic ratios may also be useful for identifying the extent of biodegradation of perchlorate, which is critical for assessing natural attenuation of this contaminant in groundwater. for this approach to be useful, however, the kinetic isotopic fractionations of o and cl during perchlorat ... | 2007 | 17533841 |
| isolation and characterization of dechlorospirillum anomalous strain jb116 from a sewage treatment plant. | the dissimilatory perchlorate reducers mainly belong to two monophyletic groups, viz. dechloromonas and azospira in the beta subclass of proteobacteria. the present study describes isolation and genetic characterization of dechlorospirillum anomalous strain jb116 that belongs to alpha subclass of proteobacteria. the strain jb116 was isolated under facultative anaerobic conditions on a growth medium containing sodium perchlorate and sodium acetate as electron (e(-)) acceptor and e(-) donor, respe ... | 2008 | 16782316 |