| acetonema longum gen. nov. sp. nov., an h2/co2 acetogenic bacterium from the termite, pterotermes occidentis. | a previously undescribed, h2-oxidizing co2-reducing acetogenic bacterium was isolated from gut contents of the wood-feeding termite, pterotermes occidentis. cells of representative strain apo-1 were strictly anaerobic. gram-negative, endospore-forming motile rods which measured 0.30-0.40 x 6-60 microm. cells were catalase positive, oxidase negative, and had 51.5 mol percent g + c in their dna. optimum conditions for growth on h2 + co2 were at 30-33 degrees c and ph (initial) 7.8, and under these ... | 1991 | 1723588 |
| hydrogen-dependent oxygen reduction by homoacetogenic bacteria isolated from termite guts. | although homoacetogenic bacteria are generally considered to be obligate anaerobes, they colonize the intestinal tracts of termites and other environments that are not entirely anoxic in space or time. in this study, we investigated how homoacetogenic bacteria isolated from the hindguts of various termites respond to the presence of molecular oxygen. all strains investigated formed growth bands in oxygen gradient agar tubes under a headspace of h(2)-co(2). the position of the bands coincided wit ... | 2003 | 12570995 |
| sporotalea propionica gen. nov. sp. nov., a hydrogen-oxidizing, oxygen-reducing, propionigenic firmicute from the intestinal tract of a soil-feeding termite. | an unusual propionigenic bacterium was isolated from the intestinal tract of the soil-feeding termite thoracotermes macrothorax. strain tmpn3 is a motile, long rod that stains gram-positive, but reacts gram-negative in the koh test. it forms terminal endospores and ferments lactate, glucose, lactose, fructose, and pyruvate to propionate and acetate via the methyl-malonyl-coa pathway. propionate and acetate are formed at a ratio of 2:1, typical of most propionigenic bacteria. under a h(2)/co(2) a ... | 2007 | 17031618 |
| geobacter pickeringii sp. nov., geobacter argillaceus sp. nov. and pelosinus fermentans gen. nov., sp. nov., isolated from subsurface kaolin lenses. | the goal of this project was to isolate representative fe(iii)-reducing bacteria from kaolin clays that may influence iron mineralogy in kaolin. two novel dissimilatory fe(iii)-reducing bacteria, strains g12(t) and g13(t), were isolated from sedimentary kaolin strata in georgia (usa). cells of strains g12(t) and g13(t) were motile, non-spore-forming regular rods, 1-2 mum long and 0.6 mum in diameter. cells had one lateral flagellum. phylogenetic analyses using the 16s rrna gene sequence of the n ... | 2007 | 17220454 |
| peptidoglycan remodeling and conversion of an inner membrane into an outer membrane during sporulation. | two hallmarks of the firmicute phylum, which includes the bacilli and clostridia classes, are their ability to form endospores and their "gram-positive" single-membraned, thick-cell-wall envelope structure. acetonema longum is part of a lesser-known family (the veillonellaceae) of clostridia that form endospores but that are surprisingly "gram negative," possessing both an inner and outer membrane and a thin cell wall. here, we present macromolecular resolution, 3d electron cryotomographic image ... | 2011 | 21884938 |