| effect of extreme salt concentrations on the physiology and biochemistry of halobacteroides acetoethylicus. | halobacteroides acetoethylicus grew in media with 6 to 20% nacl and displayed optimal growth at 10% nacl. when grown in medium with an [nacl] of 1.7 m, the internal cytoplasmic [na+] and [cl-] were 0.92 and 1.2 m, respectively, while k+ and mg2+ concentrations in cells were 0.24 and 0.02 m, respectively. intracellular [na+] was fourfold higher than intracellular [k+]. since na+ and cl- ions were not excluded from the cell, the influence of high salt concentrations on key enzyme activities was in ... | 1988 | 3290195 |
| high levels of glycolipid and low levels of phospholipid in a marine caulobacter. | studies of the lipid composition of the marine bacterium caulobacter halobacteroides revealed the presence of glycolipid as the predominant lipid constituent. the presence of minor amounts of phospholipid was confirmed with the incorporation of 14c- and 32p-labeled compounds. other marine caulobacters had similar lipid compositions. five chromatographically separable glycolipids were detected, two of which were identified as mono- and diglycosyldiglycerides. glycolipid constituted 90 to 99% of t ... | 1985 | 4055697 |
| reevaluating the classification of halobacteroides and haloanaerobacter species based on sequence comparisons of the 16s ribosomal rna gene. | the 16s rrna gene (rdna) sequence analysis of four halophilic anaerobes: halobacteroides halobius, h. lacunaris. haloanaerobacter (hb.) chitinovorans and h. acetoethylicus confirmed that they were all members of the family haloanaerobiaceae. h. lacunaris and h. halobius were found to be more closely related to each other and were distantly related to sporohalobacter lortetti and the members of the genera haloanaerobium and halothermothrix. these data are in agreement with their assignment to the ... | 1995 | 8593948 |
| the phylogenetic relationships of caulobacter, asticcacaulis and brevundimonas species and their taxonomic implications. | the phylogenetic relationships among the species of caulobacter, asticcacaulis and brevundimonas were studied by comparison of their 16s rdna sequences. the analysis of almost complete sequences confirmed the early evolutionary divergence of the freshwater and marine species of caulobacter reported previously [stahl, d. a., key, r., flesher, b. & smit, j. (1992). j bacteriol 174, 2193-2198]. the freshwater species formed two distinct clusters. one cluster contained the species caulobacter bacter ... | 1999 | 10319468 |
| phylogeny and polyphasic taxonomy of caulobacter species. proposal of maricaulis gen. nov. with maricaulis maris (poindexter) comb. nov. as the type species, and emended description of the genera brevundimonas and caulobacter. | the genus caulobacter is composed of prosthecate bacteria often specialized for oligotrophic environments. the taxonomy of caulobacter has relied primarily upon morphological criteria: a strain that visually appeared to be a member of the caulobacter has generally been called one without challenge. a polyphasic approach, comprising 16s rdna sequencing, profiling restriction fragments of 16s-23s rdna interspacer regions, lipid analysis, immunological profiling and salt tolerance characterizations ... | 1999 | 10425763 |
| characterization of halanaerobaculum tunisiense gen. nov., sp. nov., a new halophilic fermentative, strictly anaerobic bacterium isolated from a hypersaline lake in tunisia. | a new halophilic anaerobe was isolated from the hypersaline surface sediments of el-djerid chott, tunisia. the isolate, designated as strain 6sang, grew at nacl concentrations ranging from 14 to 30%, with an optimum at 20-22%. strain 6sang was a non-spore-forming, non-motile, rod-shaped bacterium, appearing singly, in pairs, or occasionally as long chains (0.7-1 x 4-13 microm) and showed a gram-negative-like cell wall pattern. it grew optimally at ph values between 7.2 and 7.4, but had a very br ... | 2009 | 19115035 |
| characterization of halanaerocella petrolearia gen. nov., sp. nov., a new anaerobic moderately halophilic fermentative bacterium isolated from a deep subsurface hypersaline oil reservoir : new taxa: firmicutes (class clostridia, order halanaerobiales, halobacteroidaceae, halobacteroides). | an anaerobic, halophilic, and fermentative bacterium, strain s200(t), was isolated from a core sample of a deep hypersaline oil reservoir. cells were rod-shaped, non-motile, and stained gram-positive. it grew at nacl concentrations ranging from 6 to 26% (w/v), with optimal growth at 15% (w/v) nacl, and at temperatures between 25 and 47°c with an optimum at 40-45°c. the optimum ph was 7.3 (range 6.2-8.8; no growth at ph 5.8 and ph 9). the doubling time in optimized growth conditions was 3.5 h. st ... | 2011 | 21761211 |