| distribution of phototrophic microbes in the flat laminated microbial mat at laguna figueroa, baja california, mexico. | the microbial mat community in the saltmarsh/evaporate flat interface at laguna figueroa involved in the deposition of laminated sediments was investigated. pigment analysis, light microscopy and transmission electron microscopy were used to determine the relative abundance and distribution of phototrophic species. the community is vertically stratified into four distinct phototrophic populations. the layering could be distinguished by pigment and species composition. the two layers closest to t ... | 1990 | 2108737 |
| evidence for the presence of the reductive pentose phosphate cycle in a filamentous anoxygenic photosynthetic bacterium, oscillochloris trichoides strain dg-6. | studies on autotrophic co2 fixation by the filamentous anoxygenic photosynthetic bacterium oscillochloris trichoides strain dg-6 demonstrated that, unlike other green bacteria, this organism metabolized co2 via the reductive pentose phosphate cycle. both key enzymes of this cycle--ribulose-1,5-bisphosphate carboxylase/oxygenase and phosphoribulokinase--were detected in cell extracts. the main product of ribulose 1,5-bisphosphate-dependent co2 fixation was 3-phosphoglyceric acid. kcn, which is kn ... | 1999 | 10439413 |
| proposal of oscillochloridaceae fam. nov. on the basis of a phylogenetic analysis of the filamentous anoxygenic phototrophic bacteria, and emended description of oscillochloris and oscillochloris trichoides in comparison with further new isolates. | the nucleotide sequences of the genes of 16s rrnas were determined for the type strain oscillochloris trichoides dg-6t and three new strains of oscillochloris-like mesophilic filamentous green bacteria. two major clusters have been found within the family chloroflexaceae by phylogenetic-analysis: one cluster includes thermophilic species of chloroflexus and the second includes mesophilic strains of oscillochloris. the degree of relatedness of these clusters was below an intergeneric level, havin ... | 2000 | 10939660 |
| phylogenetic and physiological characterization of a filamentous anoxygenic photoautotrophic bacterium ' candidatus chlorothrix halophila' gen. nov., sp. nov., recovered from hypersaline microbial mats. | we report the phylogenetic and physiological characterization of a mesophilic and halophilic member of the filamentous anoxygenic phototrophic (fap) bacteria, provisionally named ' candidatus chorothrix halophila' gen. nov. sp. nov., that has been maintained in a highly enriched culture in our laboratory for over a decade. phylogenetic analysis of small-subunit rna-encoding sequences places ' candidatus chlorothrix halophila' in a clade that includes cultivated members of the genera chloroflexus ... | 2004 | 14655000 |
| [a study of the content of pigments in the light-harvesting antenna of the green bacterium from the new family oscillochloridaceae]. | the properties of the light-harvesting superantenna of the photosynthesizing bacteria from the new family of green filamentous bacteria oscillochloridaceae were investigated by optical spectroscopy. the antenna of oscillochloris trichoides consists of peripheral chlorosomal and membrane subantennas. a method of isolation of osc. trichoides chlorosomal antenna was developed using the chaothropic agent sodium thiocyanate, which simultaneously acts to stabilize chlorosomal activity. an analysis of ... | 2004 | 15612548 |
| [a comparative study of the fluorescence properties of the chlorosomal antenna of the green bacterium from the family oscillochloridaceae and the members from two other families of green bacteria]. | the fluorescence properties of bacteriochlorophylls (bchl) of the chlorosomal light-harvesting antenna of oscillochloris trichoides (strain dg-6) from a new family of green filamentous bacteria oscillochloridaceae were investigated in comparison with green bacteria from two other families. a strong dependence of the fluorescence intensity of chlorosomal bacteriochlorophyll c of osc. trichoides on the redox potential of medium was found, which previously was observed only in green sulfur bacteria ... | 2005 | 15856984 |
| [carbon metabolism of filamentous anoxygenic phototrophic bacteria of the family oscillochloridaceae]. | the carbon metabolism of representatives of the family oscillochloridaceae (oscillochloris trichoides dg6 and the recent isolates oscillochloris sp. r, kr, and bm) has been studied. based on data from an inhibitory analysis of autotrophic co2 assimilation and measurements of the activities of the enzymes involved in this process, it is concluded that, in all oscillochloris strains, co2 fixation occurs via the operation of the calvin cycle. phosphoenolpyruvate (pep), which is formed in this cycle ... | 2005 | 16119842 |
| study of the chlorosomal antenna of the green mesophilic filamentous bacterium oscillochloris trichoides. | whole cells, chlorosome-membrane complexes and isolated chlorosomes of the green mesophilic filamentous bacterium oscillochloris trichoides, representing a new family of the green bacteria oscillochloridaceae, were studied by optical spectroscopy and electron microscopy. it was shown that the main light-harvesting pigment in the chlorosome is bchl c. the presence of bchl a in chlorosomes was visualized only by pigment extraction and fluorescence spectroscopy at 77 k. the molar ratio bchl c: bchl ... | 2002 | 16228546 |
| [factors controlling the biosynthesis of chlorosome antenna bacteriochlorophylls in green filamentous anoxygenic phototrophic bacteria of the family oscillochloridaceae]. | we determined the concentrations of bacteriochlorophylls (bchl) in the light-harvesting antennae of oscillochloris trichoides (of the family oscillochloridaceae belonging to green filamentous mesophilic bacteria) cultivated either with gabaculine, an inhibitor of the c-5 pathway of bchl biosynthesis in a number of bacteria, or at various illumination intensities. we determined the bchl c: bchl a molar ratios in intact cells, in chlorosome-membrane complexes, and in isolated chlorosomes. we revea ... | 2006 | 16758863 |
| [phylogeny of anoxygenic filamentous phototrophic bacteria of the family oscillochloridaceae as inferred from comparative analyses of the rrs, cbbl, and nifh genes]. | phylogeny of anoxygenic filamentous phototrophic bacteria (afpb) of the family oscillochloridaceae (oscillochloris trichoides dg6t and the recently isolated strains oscillochloris sp. r and c6) was studied based on comparative analyses of the genes coding for 16s rrna (rrs), ribulose- 1,5-bisphosphate carboxylase/oxygenase (cbbl), and nitrogenase (nifh). the sequences of the genes studied proved to be identical in the three strains, which is in agreement with data obtained earlier that showed la ... | 2006 | 16758872 |
| optimal spectral coordination of subantennae in natural antennae as an efficient strategy for light harvesting in photosynthesis. | this work continues a series of our investigations on efficient strategies of functioning of natural light-harvesting antennae, initiated by a concept of rigorous optimization of photosynthetic apparatus by functional criterion, and deals with the problem of an optimal spectral coordination of subantennae in photosynthetic superantenna of the green bacterium oscillochloris trichoides from a new family of green bacteria oscillochloridaceae based in 2000. at present, two subantennae were identifie ... | 2006 | 17007073 |
| [analysis of spectral conjugation of nonuniform subantennae in the light-harvesting superantenna of oscillochloridaceae photosynthetic green bacteria]. | the study is concerned with the problem of optimal spectral coupling of subantennal as a strategy of effective functioning of light-harvesting antennal of photosynthesizing organisms. a theoretical analysis of the optimality of spectral coupling of currently known spectrally inhomogeneous subantennal (b750, b805-860) in the superantenna of green bacteria oscillochloris trichoides (from the new family oscillochloridaceal discovered by russian researchers in 2000), performed in the study, showed t ... | 2007 | 17348398 |
| [the structure of phototrophic communities of soda lakes of the southeastern transbaikal region]. | the structure of benthic phototrophic communities of 24 soda lakes of the southeastern transbaikal region was studied. the physicochemical properties of the lakes were determined. the results of the cell count of anoxygenic phototrophic bacteria (apb) belonging to various groups are presented. the influence of salinity on the structure of apb communities was investigated. the apb reaction to environmental conditions was determined. massive development of phototrophic microorganisms in the form o ... | 2007 | 17583222 |
| ribulose bisphosphate carboxylase activity and a calvin cycle gene cluster in sulfobacillus species. | the calvin-benson-bassham (cbb) cycle has been extensively studied in proteobacteria, cyanobacteria, algae and plants, but hardly at all in gram-positive bacteria. some characteristics of ribulose bisphosphate carboxylase/oxygenase (rubisco) and a cluster of potential cbb cycle genes in a gram-positive bacterium are described in this study with two species of sulfobacillus (gram-positive, facultatively autotrophic, mineral sulfide-oxidizing acidophiles). in contrast to the gram-negative, iron-ox ... | 2007 | 17600067 |
| two-dimensional mapping of photopigment distribution and activity of chloroflexus-like bacteria in a hypersaline microbial mat. | pigment analysis in an intact hypersaline microbial mat by hyperspectral imaging revealed very patchy and spatially uncorrelated distributions of photopigments chl a and bchl a/c, which are characteristic photopigments for oxygenic (diatoms and cyanobacteria) and anoxygenic phototrophs (chloroflexaceae). this finding is in contrast to the expectation that these biomarker pigments should be spatially correlated, as oxygenic phototrophs are thought to supply the chloroflexaceae members with organi ... | 2008 | 18616583 |
| draft genome sequence of the anoxygenic filamentous phototrophic bacterium oscillochloris trichoides subsp. dg-6. | oscillochloris trichoides is a mesophilic, filamentous, photoautotrophic, nonsulfur, diazotrophic bacterium which is capable of carbon dioxide fixation via the reductive pentose phosphate cycle and possesses no assimilative sulfate reduction. here, we present the draft genome sequence of oscillochloris trichoides subsp. dg-6, the type strain of the species, which has permitted the prediction of genes for carbon and nitrogen metabolism and for the light-harvesting apparatus. | 2010 | 21037015 |
| CsmA Protein is Associated with BChl a in the Baseplate Subantenna of Chlorosomes of the Photosynthetic Green Filamentous Bacterium Oscillochloris trichoides belonging to the Family Oscillochloridaceae. | The baseplate subantenna in chlorosomes of green anoxygenic photosynthetic bacteria, belonging to the families Chloroflexaceae and Chlorobiaceae, is known to represent a complex of bacteriochlorophyll (BChl) a with the ~6 kDa CsmA proteins. Earlier, we showed the existence of a similar BChl a subantenna in chlorosomes of the photosynthetic green bacterium Oscillochloris trichoides, member of Oscillochloridaceae, the third family of green photosynthetic bacteria. However, this BChl a subantenna w ... | 2011 | 21941538 |