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ruegeria pelagia sp. nov., isolated from the sargasso sea, atlantic ocean.gram-negative, facultatively aerobic, chemoheterotrophic, short rod-shaped marine bacterial strains htcc2662(t) and htcc2663, isolated from the sargasso sea by using a dilution-to-extinction culturing method, were investigated to determine their taxonomic position. characterization of the two strains by phenotypic and phylogenetic analyses revealed that they belonged to the same species. the dna g+c content of strain htcc2662(t) was 58.4 mol% and the predominant cellular fatty acids were c(18 : ...200717684263
ruegeria pelagia is a later heterotypic synonym of ruegeria mobilis.the 16s rrna genes of ruegeria pelagia nbrc 102038t and ruegeria mobilis nbrc 101030t were resequenced and the results confirmed that they differ by only one base in their almost full-length sequences (1425 nt). the gyrb gene sequence similarity between the two strains was also high (97.7%). the outcome of api 20ne, api zym and antibiotic susceptibility tests showed that the two strains show only one difference, in beta-galactosidase activity, in api tests and five differences in susceptibility ...201019783609
antibacterial activity of marine culturable bacteria collected from a global sampling of ocean surface waters and surface swabs of marine organisms.the purpose of the present study was to isolate marine culturable bacteria with antibacterial activity and hence a potential biotechnological use. seawater samples (244) and 309 swab samples from biotic or abiotic surfaces were collected on a global danish marine research expedition (galathea 3). total cell counts at the seawater surface were 5 x 10(5) to 10(6) cells/ml, of which 0.1-0.2% were culturable on dilute marine agar (20 degrees c). three percent of the colonies cultured from seawater i ...201019823914
response to uvb radiation and oxidative stress of marine bacteria isolated from south pacific ocean and mediterranean sea.marine bacterial strains isolated from south pacific and mediterranean sea were studied for their resistance to uvb radiation, their repair capacity under photoreactivating light, as well as their oxidative stress response using concentrated hydrogen peroxide (h(2)o(2)), as an oxidizer. a total of 30 marine bacteria were isolated from the hyper-oligotrophic waters of the south pacific gyre to the eutrophic waters of the chilean coast during the biosope cruise (2004), and 10 strains from surface ...201223165168
biofilm formation and antibiotic production in ruegeria mobilis are influenced by intracellular concentrations of cyclic dimeric guanosinmonophosphate.in many species of the marine roseobacter clade, periods of attached life, in association with phytoplankton or particles, are interspersed with planktonic phases. the purpose of this study was to determine whether shifts between motile and sessile life in the globally abundant roseobacter clade species ruegeria mobilis are associated with intracellular concentrations of the signal compound cyclic dimeric guanosinmonophosphate (c-di-gmp), which in bacteria regulates transitions between motile an ...201424118907
influence of iron on production of the antibacterial compound tropodithietic acid and its noninhibitory analog in phaeobacter inhibens.tropodithietic acid (tda) is an antibacterial compound produced by some phaeobacter and ruegeria spp. of the roseobacter clade. tda production is studied in marine broth or agar since antibacterial activity in other media is not observed. the purpose of this study was to determine how tda production is influenced by substrate components. high concentrations of ferric citrate, as present in marine broth, or other iron sources were required for production of antibacterially active tda. however, wh ...201526519388
global occurrence and heterogeneity of the roseobacter-clade species ruegeria mobilis.tropodithietic acid (tda)-producing ruegeria mobilis strains of the roseobacter clade have primarily been isolated from marine aquaculture and have probiotic potential due to inhibition of fish pathogens. we hypothesized that tda producers with additional novel features are present in the oceanic environment. we isolated 42 tda-producing r. mobilis strains during a global marine research cruise. while highly similar on the 16s ribosomal rna gene level (99-100% identity), the strains separated in ...201727552638
global occurrence and heterogeneity of the roseobacter-clade species ruegeria mobilis. 201728117449
toxicity of bioactive and probiotic marine bacteria and their secondary metabolites in artemia sp. and caenorhabditis elegans as eukaryotic model organisms.we have previously reported that some strains belonging to the marine actinobacteria class, the pseudoalteromonas genus, the roseobacter clade, and the photobacteriaceae and vibrionaceae families produce both antibacterial and antivirulence compounds, and these organisms are interesting from an applied point of view as fish probiotics or as a source of pharmaceutical compounds. the application of either organisms or compounds requires that they do not cause any side effects, such as toxicity in ...201424141121
cribrihabitans neustonicus sp. nov., isolated from coastal surface seawater, and emended description of the genus cribrihabitans chen et al. 2014.a gram-stain-negative, strictly aerobic, rod- or oval-shaped, motile, non-spore-forming bacterium, designated strain cc-amhb-3(t), was isolated from coastal surface seawater off hualien, taiwan. the novel strain showed high pairwise 16s rrna gene sequence similarities to ruegeria mobilis nbrc 101030(t) (96.5%), ruegeria scottomollicae lmg 24367(t) (96.4%), phaeobacter aquaemixtae ssk6-1(t) (96.2%), phaeobacter daeponensis tf-218(t) (96.2%), cribrihabitans marinus cz-am5(t) (96.1%) and other spec ...201425180090
phaeobacter and ruegeria species of the roseobacter clade colonize separate niches in a danish turbot (scophthalmus maximus)-rearing farm and antagonize vibrio anguillarum under different growth conditions.members of the roseobacter clade colonize a spanish turbot larval unit, and one isolate (phaeobacter strain 27-4) is capable of disease suppression in in vivo challenge trials. here, we demonstrate that roseobacters with antagonistic activity against vibrio anguillarum also colonize a danish turbot larval farm that relies on a very different water source (the danish fiord limfjorden as opposed to the galician atlantic ocean). phylogenetic analyses based on 16s rrna and gyrase b gene sequences re ...200818952864
ruegeria scottomollicae sp. nov., isolated from a marine electroactive biofilm.seventy isolates were obtained from a marine electroactive biofilm that was generated on a cathodically polarized stainless steel electrode (genoa, italy). the genetic diversity was investigated by means of box-pcr fingerprinting and two clusters of isolates with similar box-pcr profiles were delineated. whole-cell fatty acid methyl ester analysis and 16s rrna gene sequence analysis showed that the isolates belonged to the roseobacter lineage of the class alphaproteobacteria. dna-dna hybridizati ...200819060048
ruegeria mobilis sp. nov., a member of the alphaproteobacteria isolated in japan and palau.the taxonomic positions of two bacterial strains, mbic01146(t) and mbic01099, isolated from marine environments of japan and palau, respectively, were determined by using a polyphasic approach. the bacteria were aerobic, motile, gram-negative rods and formed star-shaped aggregations. the g+c content of the genomic dna ranged from 58.5 to 58.7 mol%. the major respiratory quinone was ubiquinone-10 and the predominant cellular fatty acids were c(16 : 0), c(18 : 1)omega6c and c(18 : 1)omega7c. 16s r ...200717551047
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