| ottowia thiooxydans gen. nov., sp. nov., a novel facultatively anaerobic, n2o-producing bacterium isolated from activated sludge, and transfer of aquaspirillum gracile to hylemonella gracilis gen. nov., comb. nov. | strain k11t was isolated from activated sludge of a municipal wastewater-treatment plant. phylogenetic analysis of the 16s rrna gene sequence revealed that it represents a distinct line of descent within the comamonadaceae. the novel strain was a gram-negative, catalase- and oxidase-positive, non-motile, straight to slightly curved rod. polyhydroxyalkanoate granules were stored intracellularly as reserve material. colonies on agar plates were small, regular and characterized by a water-insoluble ... | 2004 | 14742465 |
| quantification of the filterability of freshwater bacteria through 0.45, 0.22, and 0.1 microm pore size filters and shape-dependent enrichment of filterable bacterial communities. | micro-filtration is a standard process for sterilization in scientific research, medical, and industrial applications, and to remove particles in drinking water or wastewater treatment. it is generally assumed, and confirmed by quantifying filtration efficiency by plating, that filters with a 0.1-0.45 microm pore size can retain bacteria. in contrast to this assumption, we have regularly observed the passage of a significant fraction of natural freshwater bacterial communities through 0.45, 0.22 ... | 2007 | 17993151 |
| influence of size, shape, and flexibility on bacterial passage through micropore membrane filters. | sterilization of fluids by means of microfiltration is commonly applied in research laboratories as well as in pharmaceutical and industrial processes. sterile micropore filters are subject to microbiological validation, where brevundimonas diminuta is used as a standard test organism. however, several recent reports on the ubiquitous presence of filterable bacteria in aquatic environments have cast doubt on the accuracy and validity of the standard filter-testing method. six different bacterial ... | 2008 | 18800559 |
| abundance and community of snow bacteria from three glaciers in the tibetan plateau. | bacterial abundance and diversity in snow of east rongbuk, laohugou and hailuogou glaciers on the tibetan plateau were investigated through epifluorescence microscope and denaturing gradient gel electrophoresis. cell abundance ranged from 4.0 x 10(3) to 290.2 x 10(3) cells/ml. the phylogenetic trees placed the 16s rrna sequences in four major groups: proteobacteria, firmicutes, actinobacteria and bacteroidetes. brevundimonas, flavobacterium, hymenobacter, bacillus, polaromonas, rhodoferax and st ... | 2010 | 21174974 |