The Experts below are selected from a list of 117 Experts worldwide ranked by ideXlab platform
Yasutaka Watanabe - One of the best experts on this subject based on the ideXlab platform.
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the role of the 11bu state in carotenoid to bacteriochlorophyll singlet energy transfer in the lh2 antenna complexes from rhodobacter sphaeroides g1c rhodobacter sphaeroides 2 4 1 Rhodospirillum molischianum and rhodopseudomonas acidophila
Chemical Physics Letters, 2004Co-Authors: Ferdy S Rondonuwu, Ritsuko Fujii, Richard J Cogdell, Kyosuke Yokoyama, Yasushi Koyama, Yasutaka WatanabeAbstract:Abstract Subpicosecond time-resolved absorption spectra were recorded, in the visible and near-infrared regions, for the LH2 antenna complexes from Rhodobacter sphaeroides G1C, Rhodobacter sphaeroides 2.4.1, Rhodospirillum molischianum , and Rhodopseudomonas acidophila . The efficiencies of carotenoid-to-bacteriochlorophyll singlet-energy transfer through the 1 1 B u + , 1 1 B u − , and 2 1 A g − channels in the LH2 complex were determined to be 48%, 19% and 22% in Rhodobacter sphaeroides G1C; 46%, 18% and 20% in Rhodobacter sphaeroides 2.4.1; 48%, ∼2% and ∼1% in Rhodospirillum molischianum ; and 48%, ∼2%, ∼4% in Rhodopseudomonas acidophila . Sums of efficiencies through the three channels in the four LH2 complexes, 88%, 84%, 51% and 54%, nicely correlate with the efficiencies that were determined by comparison of the absorption and fluorescence-excitation spectra, 92%, 89%, 53% and 56%.
Ch. V. Ramana - One of the best experts on this subject based on the ideXlab platform.
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Rhodospirillum oryzae sp. nov., a phototrophic bacterium isolated from rhizosphere soil of paddy.
International Journal of Systematic and Evolutionary Microbiology, 2013Co-Authors: K V N S Lakshmi, Ch Sasikala, E. V. V. Ramaprasad, Ch. V. RamanaAbstract:A reddish-brown bacterium, designated strain JA318T, was purified from a photoheterotrophic enrichment culture obtained from the rhizosphere soil of paddy. Cells of strain JA318T are spiral shaped, Gram-stain-negative and motile by means of amphitrichous flagella. Strain JA318T has no NaCl requirement for growth but can tolerate up to 1.5 % (w/v) NaCl. Internal photosynthetic membranes are present as lamellar stacks. Photoorganoheterotrophy is the only growth mode observed. Strain JA318T contains bacteriochlorophyll a, lycopene and rhodopin as major carotenoids. Thiamine, niacin and para-aminobenzoic acid (PABA) are required as growth factors. Major fatty acids are C18 : 1ω7c and C16 : 0. Ubiquinone-8 and rhodoquinone-8 are the observed quinones. Diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine and an unidentified aminolipid are the major polar lipids in strain JA318T. Phylogenetic analysis based on 16S rRNA gene sequences showed that the strain JA318T clustered with species of the genus Rhodospirillum which belongs to the class Alphaproteobacteria . The highest sequence similarity of strain JA318T was found with Rhodospirillum sulfurexigens JA143T (99.9 %). The DNA–DNA reassociation values of strain JA318T with Rsp. sulfurexigens JA143T and Rhodospirillum photometricum DSM 122T were 52±2 % and 45±1 %, respectively. The genomic DNA G+C content of strain JA318T was 60.2 mol%. Based on the morphological, physiological, chemotaxonomical and molecular evidence, strain JA318T is significantly different from the type strains of species of the genus Rhodospirillum , of the family Rhodospirillaceae , and it is proposed that the strain be classified as a representative of a novel species for which the name Rhodospirillum oryzae sp. nov. is proposed. The type strain is JA318T ( = KCTC 5960T = NBRC 107573T).
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Rhodospirillum sulfurexigens sp. nov., a phototrophic alphaproteobacterium requiring a reduced sulfur source for growth.
INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY, 2008Co-Authors: P. Anil Kumar, Ch Sasikala, P. Aparna, T. N. R. Srinivas, Ch. V. RamanaAbstract:A Gram-negative, spiral-shaped, phototrophic, purple non-sulfur bacterial strain, JA143(T), was isolated from a freshwater habitat. Strain JA143(T) was motile by means of bipolar tufts of flagella. Intracellular photosynthetic membranes are of the lamellar stacked type. Bacteriochlorophyll a and carotenoids of the spirilloxanthin series with rhodovibrin are present as photosynthetic pigments. Thiamine and a reduced sulfur source are required for growth. Phylogenetic analysis on the basis of 16S rRNA gene sequences showed that strain JA143(T) clusters with species of the genus Rhodospirillum, belonging to the class Alphaproteobacteria. The highest sequence similarities of strain JA143(T) were found with the type strains of Rhodospirillum rubrum (95.6 %) and Rhodospirillum photometricum (95.7 %). Based on 16S rRNA gene sequence analysis and morphological and physiological characteristics, strain JA143(T) was significantly different from the other two recognized species of the genus Rhodospirillum and represents a novel species, for which the name Rhodospirillum sulfurexigens sp. nov. is proposed. The type strain is JA143(T) (=DSM 19785(T) =NBRC 104433(T)).
Ch Sasikala - One of the best experts on this subject based on the ideXlab platform.
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reclassification of Rhodospirillum photometricum molisch 1907 Rhodospirillum sulfurexigens anil kumar et al 2008 and Rhodospirillum oryzae lakshmi et al 2013 in a new genus paraRhodospirillum gen nov as paraRhodospirillum photometricum comb nov parar
International Journal of Systematic and Evolutionary Microbiology, 2014Co-Authors: K V N S Lakshmi, B Divyasree, E V V Ramprasad, Ch Sasikala, Chilakamarti V. RamanaAbstract:The genus Rhodospirillum is represented by four species, with three of them showing phylogenetic divergence compared to the type species, Rhodospirillum rubrum . Differences in the major diagnostic properties such as internal photosynthetic membranes, quinones, fatty acids, carotenoid composition and a few other phenotypic properties warrant the reclassification of members of this genus. Resultantly, a new genus, ParaRhodospirillum gen. nov., is proposed based on the analysis of nine strains to accommodate Rhodospirillum photometricum , Rhodospirillum sulfurexigens and Rhodospirillum oryzae as ParaRhodospirillum photometricum comb. nov., ParaRhodospirillum sulfurexigens comb. nov. and ParaRhodospirillum oryzae comb. nov., respectively. The type species of the genus is ParaRhodospirillum photometricum comb. nov. An emended description of the genus Rhodospirillum is also proposed.
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Rhodospirillum oryzae sp. nov., a phototrophic bacterium isolated from rhizosphere soil of paddy.
International Journal of Systematic and Evolutionary Microbiology, 2013Co-Authors: K V N S Lakshmi, Ch Sasikala, E. V. V. Ramaprasad, Ch. V. RamanaAbstract:A reddish-brown bacterium, designated strain JA318T, was purified from a photoheterotrophic enrichment culture obtained from the rhizosphere soil of paddy. Cells of strain JA318T are spiral shaped, Gram-stain-negative and motile by means of amphitrichous flagella. Strain JA318T has no NaCl requirement for growth but can tolerate up to 1.5 % (w/v) NaCl. Internal photosynthetic membranes are present as lamellar stacks. Photoorganoheterotrophy is the only growth mode observed. Strain JA318T contains bacteriochlorophyll a, lycopene and rhodopin as major carotenoids. Thiamine, niacin and para-aminobenzoic acid (PABA) are required as growth factors. Major fatty acids are C18 : 1ω7c and C16 : 0. Ubiquinone-8 and rhodoquinone-8 are the observed quinones. Diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine and an unidentified aminolipid are the major polar lipids in strain JA318T. Phylogenetic analysis based on 16S rRNA gene sequences showed that the strain JA318T clustered with species of the genus Rhodospirillum which belongs to the class Alphaproteobacteria . The highest sequence similarity of strain JA318T was found with Rhodospirillum sulfurexigens JA143T (99.9 %). The DNA–DNA reassociation values of strain JA318T with Rsp. sulfurexigens JA143T and Rhodospirillum photometricum DSM 122T were 52±2 % and 45±1 %, respectively. The genomic DNA G+C content of strain JA318T was 60.2 mol%. Based on the morphological, physiological, chemotaxonomical and molecular evidence, strain JA318T is significantly different from the type strains of species of the genus Rhodospirillum , of the family Rhodospirillaceae , and it is proposed that the strain be classified as a representative of a novel species for which the name Rhodospirillum oryzae sp. nov. is proposed. The type strain is JA318T ( = KCTC 5960T = NBRC 107573T).
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Rhodospirillum sulfurexigens sp. nov., a phototrophic alphaproteobacterium requiring a reduced sulfur source for growth.
INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY, 2008Co-Authors: P. Anil Kumar, Ch Sasikala, P. Aparna, T. N. R. Srinivas, Ch. V. RamanaAbstract:A Gram-negative, spiral-shaped, phototrophic, purple non-sulfur bacterial strain, JA143(T), was isolated from a freshwater habitat. Strain JA143(T) was motile by means of bipolar tufts of flagella. Intracellular photosynthetic membranes are of the lamellar stacked type. Bacteriochlorophyll a and carotenoids of the spirilloxanthin series with rhodovibrin are present as photosynthetic pigments. Thiamine and a reduced sulfur source are required for growth. Phylogenetic analysis on the basis of 16S rRNA gene sequences showed that strain JA143(T) clusters with species of the genus Rhodospirillum, belonging to the class Alphaproteobacteria. The highest sequence similarities of strain JA143(T) were found with the type strains of Rhodospirillum rubrum (95.6 %) and Rhodospirillum photometricum (95.7 %). Based on 16S rRNA gene sequence analysis and morphological and physiological characteristics, strain JA143(T) was significantly different from the other two recognized species of the genus Rhodospirillum and represents a novel species, for which the name Rhodospirillum sulfurexigens sp. nov. is proposed. The type strain is JA143(T) (=DSM 19785(T) =NBRC 104433(T)).
K V N S Lakshmi - One of the best experts on this subject based on the ideXlab platform.
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reclassification of Rhodospirillum photometricum molisch 1907 Rhodospirillum sulfurexigens anil kumar et al 2008 and Rhodospirillum oryzae lakshmi et al 2013 in a new genus paraRhodospirillum gen nov as paraRhodospirillum photometricum comb nov parar
International Journal of Systematic and Evolutionary Microbiology, 2014Co-Authors: K V N S Lakshmi, B Divyasree, E V V Ramprasad, Ch Sasikala, Chilakamarti V. RamanaAbstract:The genus Rhodospirillum is represented by four species, with three of them showing phylogenetic divergence compared to the type species, Rhodospirillum rubrum . Differences in the major diagnostic properties such as internal photosynthetic membranes, quinones, fatty acids, carotenoid composition and a few other phenotypic properties warrant the reclassification of members of this genus. Resultantly, a new genus, ParaRhodospirillum gen. nov., is proposed based on the analysis of nine strains to accommodate Rhodospirillum photometricum , Rhodospirillum sulfurexigens and Rhodospirillum oryzae as ParaRhodospirillum photometricum comb. nov., ParaRhodospirillum sulfurexigens comb. nov. and ParaRhodospirillum oryzae comb. nov., respectively. The type species of the genus is ParaRhodospirillum photometricum comb. nov. An emended description of the genus Rhodospirillum is also proposed.
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Rhodospirillum oryzae sp. nov., a phototrophic bacterium isolated from rhizosphere soil of paddy.
International Journal of Systematic and Evolutionary Microbiology, 2013Co-Authors: K V N S Lakshmi, Ch Sasikala, E. V. V. Ramaprasad, Ch. V. RamanaAbstract:A reddish-brown bacterium, designated strain JA318T, was purified from a photoheterotrophic enrichment culture obtained from the rhizosphere soil of paddy. Cells of strain JA318T are spiral shaped, Gram-stain-negative and motile by means of amphitrichous flagella. Strain JA318T has no NaCl requirement for growth but can tolerate up to 1.5 % (w/v) NaCl. Internal photosynthetic membranes are present as lamellar stacks. Photoorganoheterotrophy is the only growth mode observed. Strain JA318T contains bacteriochlorophyll a, lycopene and rhodopin as major carotenoids. Thiamine, niacin and para-aminobenzoic acid (PABA) are required as growth factors. Major fatty acids are C18 : 1ω7c and C16 : 0. Ubiquinone-8 and rhodoquinone-8 are the observed quinones. Diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine and an unidentified aminolipid are the major polar lipids in strain JA318T. Phylogenetic analysis based on 16S rRNA gene sequences showed that the strain JA318T clustered with species of the genus Rhodospirillum which belongs to the class Alphaproteobacteria . The highest sequence similarity of strain JA318T was found with Rhodospirillum sulfurexigens JA143T (99.9 %). The DNA–DNA reassociation values of strain JA318T with Rsp. sulfurexigens JA143T and Rhodospirillum photometricum DSM 122T were 52±2 % and 45±1 %, respectively. The genomic DNA G+C content of strain JA318T was 60.2 mol%. Based on the morphological, physiological, chemotaxonomical and molecular evidence, strain JA318T is significantly different from the type strains of species of the genus Rhodospirillum , of the family Rhodospirillaceae , and it is proposed that the strain be classified as a representative of a novel species for which the name Rhodospirillum oryzae sp. nov. is proposed. The type strain is JA318T ( = KCTC 5960T = NBRC 107573T).
Ritsuko Fujii - One of the best experts on this subject based on the ideXlab platform.
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probing the effect of the binding site on the electrostatic behavior of a series of carotenoids reconstituted into the light harvesting 1 complex from purple photosynthetic bacterium Rhodospirillum rubrum detected by stark spectroscopy
Journal of Physical Chemistry B, 2008Co-Authors: Katsunori Nakagawa, Satoru Suzuki, Ritsuko Fujii, Alastair T Gardiner, Richard J Cogdell, Mamoru Nango, Hideki HashimotoAbstract:Reconstitutions of the LH1 complexes from the purple photosynthetic bacterium Rhodospirillum rubrum S1 were performed with a range of carotenoid molecules having different numbers of C═C conjugated...
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the role of the 11bu state in carotenoid to bacteriochlorophyll singlet energy transfer in the lh2 antenna complexes from rhodobacter sphaeroides g1c rhodobacter sphaeroides 2 4 1 Rhodospirillum molischianum and rhodopseudomonas acidophila
Chemical Physics Letters, 2004Co-Authors: Ferdy S Rondonuwu, Ritsuko Fujii, Richard J Cogdell, Kyosuke Yokoyama, Yasushi Koyama, Yasutaka WatanabeAbstract:Abstract Subpicosecond time-resolved absorption spectra were recorded, in the visible and near-infrared regions, for the LH2 antenna complexes from Rhodobacter sphaeroides G1C, Rhodobacter sphaeroides 2.4.1, Rhodospirillum molischianum , and Rhodopseudomonas acidophila . The efficiencies of carotenoid-to-bacteriochlorophyll singlet-energy transfer through the 1 1 B u + , 1 1 B u − , and 2 1 A g − channels in the LH2 complex were determined to be 48%, 19% and 22% in Rhodobacter sphaeroides G1C; 46%, 18% and 20% in Rhodobacter sphaeroides 2.4.1; 48%, ∼2% and ∼1% in Rhodospirillum molischianum ; and 48%, ∼2%, ∼4% in Rhodopseudomonas acidophila . Sums of efficiencies through the three channels in the four LH2 complexes, 88%, 84%, 51% and 54%, nicely correlate with the efficiencies that were determined by comparison of the absorption and fluorescence-excitation spectra, 92%, 89%, 53% and 56%.
