| roseovarius tolerans gen. nov., sp. nov., a budding bacterium with variable bacteriochlorophyll a production from hypersaline ekho lake. | eight gram-negative, aerobic, pointed and budding bacteria were isolated from various depths of the hypersaline, heliothermal and meromictic ekho lake (vestfold hills, east antarctica). the cells contained storage granules and daughter cells could be motile. bacteriochlorophyll a was sometimes produced, but production was repressed by constant dim light. the strains tolerated a wide range of temperature, ph, concentrations of artificial seawater and nacl, but had an absolute requirement for sodi ... | 1999 | 10028255 |
| poles apart: biodiversity and biogeography of sea ice bacteria. | this review introduces the subjects of bacterial biodiversity and biogeography. studies of biogeography are important for understanding biodiversity, the occurrence of threatened species, and the ecological role of free-living and symbiotic prokaryotes. a set of postulates is proposed for biogeography as a guide to determining whether prokaryotes are "cosmopolitan" (found in more than one geographic location on earth) or candidate endemic species. the term "geovar" is coined to define a geograph ... | 1999 | 10547690 |
| phylogenetic diversity of numerically important arctic sea-ice bacteria cultured at subzero temperature. | heterotrophic bacteria in sea ice play a key role in carbon cycling, but little is known about the predominant players at the phylogenetic level. in a study of both algal bands and clear ice habitats within summertime arctic pack ice from the chukchi sea, we determined the abundance of total bacteria and actively respiring cells in melted ice samples using epifluorescence microscopy and the stains 4', 6'-diamidino-2-phenylindole 2hcl (dapi) and 5-cyano-2,3-ditolyl tetrazolium chloride (ctc), res ... | 2002 | 12037610 |
| diversity and structure of bacterial communities in arctic versus antarctic pack ice. | a comprehensive assessment of bacterial diversity and community composition in arctic and antarctic pack ice was conducted through cultivation and cultivation-independent molecular techniques. we sequenced 16s rrna genes from 115 and 87 pure cultures of bacteria isolated from arctic and antarctic pack ice, respectively. most of the 33 arctic phylotypes were >97% identical to previously described antarctic species or to our own antarctic isolates. at both poles, the alpha- and gamma-proteobacteri ... | 2003 | 14602620 |
| loktanella salsilacus gen. nov., sp. nov., loktanella fryxellensis sp. nov. and loktanella vestfoldensis sp. nov., new members of the rhodobacter group, isolated from microbial mats in antarctic lakes. | a taxonomic study was performed on 26 strains isolated from microbial mats in antarctic lakes of the vestfold hills and the mcmurdo dry valleys. phylogenetic analysis based on 16s rrna gene sequences placed these strains within the rhodobacter group of the alpha-subclass of the proteobacteria. sequence similarity values for the strains with their nearest phylogenetic neighbours (jannaschia, octadecabacter and ketogulonicigenium) ranged between 94.0 and 95.8%. dna-dna hybridizations and compariso ... | 2004 | 15280301 |
| roseisalinus antarcticus gen. nov., sp. nov., a novel aerobic bacteriochlorophyll a-producing alpha-proteobacterium isolated from hypersaline ekho lake, antarctica. | a gram-negative, aerobic to microaerophilic rod was isolated from 10 m depths of the hypersaline, heliothermal and meromictic ekho lake (east antarctica). the strain was oxidase- and catalase-positive, metabolized a variety of carboxylic acids and sugars and produced lipase. cells had an absolute requirement for artificial sea water, which could not be replaced by nacl. a large in vivo absorption band at 870 nm indicated production of bacteriochlorophyll a. the predominant fatty acids of this or ... | 2005 | 15653851 |
| roseicyclus mahoneyensis gen. nov., sp. nov., an aerobic phototrophic bacterium isolated from a meromictic lake. | eight strains of gram-negative bacteria able to form ring-like cells were isolated from mahoney lake, a meromictic lake in south-central british columbia, canada. all strains were pink-purple and contained bacteriochlorophyll a incorporated into the light-harvesting 1 and 2 and reaction-centre pigment-protein complexes. growth did not occur anaerobically under illuminated conditions; these strains were obligately aerobic, prompting their designation as members of the aerobic phototrophic bacteri ... | 2005 | 16014488 |
| thalassobacter arenae sp. nov., isolated from sea sand in korea. | a gram-negative, short rod-shaped bacterium, strain ga2-m15(t), was isolated from a sea-sand sample at homi cape, pohang city, republic of korea. 16s rrna gene sequence analysis demonstrated that this isolate was unique, showing 95.9 % sequence similarity to the type strain of thalassobacter stenotrophicus and similarities of 94.0-95.2 % to the type strains of species of the genera octadecabacter (94.4-95.2 %), jannaschia (94.0-94.4 %) and thalassobius (94.0-94.7 %). chemotaxonomic characteristi ... | 2009 | 19244427 |
| gaetbulicola byunsanensis gen. nov., sp. nov., isolated from tidal flat sediment. | a gram-negative, non-motile and pleomorphic bacterial strain, smk-114(t), which belongs to the class alphaproteobacteria, was isolated from a tidal flat sample collected in byunsan, korea. strain smk-114(t) grew optimally at ph 7.0-8.0 and 25-30 degrees c and in the presence of 2 % (w/v) nacl. a neighbour-joining phylogenetic tree based on 16s rrna gene sequences showed that strain smk-114(t) formed a cluster with octadecabacter species, with which it exhibited 16s rrna gene sequence similarity ... | 2010 | 19648332 |
| phylogenetic diversity of bacterial communities in south china sea mesoscale cyclonic eddy perturbations. | eddy pumping drives a set of biogeochemical processes by lifting deep waters into the euphotic zone. to address the potential effect of such physical processes upon the bacterial community, phylogenetic diversity was determined in two cold-core cyclonic eddies in the south china sea. 16s rdna terminal restriction fragment length polymorphism analysis of the microbial communities through the whole water column showed a wider depth range for the intermediate transition water mass at sites inside t ... | 2010 | 21187147 |