| composition and activity of an autotrophic fe(ii)-oxidizing, nitrate-reducing enrichment culture. | 16s rrna gene libraries from the lithoautotrophic fe(ii)-oxidizing, nitrate-reducing enrichment culture described by straub et al. (k. l. straub, m. benz, b. schink, and f. widdel, appl. environ. microbiol. 62:1458-1460, 1996) were dominated by a phylotype related (95% 16s rrna gene homology) to the autotrophic fe(ii) oxidizer sideroxydans lithotrophicus. the libraries also contained phylotypes related to known heterotrophic nitrate reducers comamonas badia, parvibaculum lavamentivorans, and rho ... | 2009 | 19749073 |
| acid-tolerant microaerophilic fe(ii)-oxidizing bacteria promote fe(iii)-accumulation in a fen. | the ecological importance of fe(ii)-oxidizing bacteria (feob) at circumneutral ph is often masked in the presence of o(2) where rapid chemical oxidation of fe(ii) predominates. this study addresses the abundance, diversity and activity of microaerophilic feob in an acidic fen (ph ∼ 5) located in northern bavaria, germany. mean o(2) penetration depth reached 16 cm where the highest dissolved fe(ii) concentrations (up to 140 µm) were present in soil water. acid-tolerant feob cultivated in gradient ... | 2010 | 20545739 |
| characterization of bacterial community structure in a drinking water distribution system during an occurrence of red water. | the role of bacteria in the occasional emergence of red water, which has been documented worldwide, has yet to be determined. to better understand the mechanisms that drive occurrences of red water, the bacterial community composition and the relative abundance of several functional bacterial groups in a water distribution system of beijing during a large-scale red water event were determined using several molecular methods. individual clone libraries of the 16s rrna gene were constructed for th ... | 2010 | 20851995 |
| isolation and characterization of a novel biomineral stalk-forming iron-oxidizing bacterium from a circumneutral groundwater seep. | the fe-depositing microorganism gallionella ferruginea was first described in 1836 based on its association with fe-rich environments and its distinctive morphology. since then, this morphology has been widely used to identify g. ferruginea. researchers have isolated several fe-oxidizing bacteria (feob) related to gallionella; however, few isolates have produced organized extracellular biomineral structures, and of these, only one stalk former has a sequenced 16s rrna gene, listed as g. ferrugin ... | 2011 | 22151253 |
| Influence of uranium on bacterial communities: a comparison of natural uranium-rich soils with controls. | This study investigated the influence of uranium on the indigenous bacterial community structure in natural soils with high uranium content. Radioactive soil samples exhibiting 0.26% - 25.5% U in mass were analyzed and compared with nearby control soils containing trace uranium. EXAFS and XRD analyses of soils revealed the presence of U(VI) and uranium-phosphate mineral phases, identified as sabugalite and meta-autunite. A comparative analysis of bacterial community fingerprints using denaturing ... | 2011 | 21998695 |