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  • 1
    Electronic Resource
    Electronic Resource
    Distinctive properties of bacilliform photosynthetic heliobacteria (1988)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 49 (1988), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Heliobacterium chlorum and Heliobacillus mobilis are closely related N2-fixing anoxyphoto-trophs that contain bacteriochlorophyll g (Bchl g) as the major photopigment. In the presence of O2 and light, the absorbance peak in the infra-red (788 nm) of this novel photoreceptor disappears and absorbance at 670 nm increases simultaneously. These optical changes appear to be due to a photoisomerization reaction which converts Bchl g to a form of green-plant chlorophyll a (in which farnesol replaces phytol). In addition to this unusual property, the Gram-negative heliobacteria present biochemical features (16S RNA base sequence and peptidoglycan structure) indicating an evolutionary relationship with some Gram-positive bacteria. In comparison to H. chlorum, H. mobilis grows more robustly and shows a much lower tendency to spheroplast and lyse; accordingly, H. mobilis is better suited for further investigations on the biology and biochemistry of these exceptional prokaryotes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1988.tb02774.x
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  • 2
    Electronic Resource
    Electronic Resource
    Isolation and characterization of the N2-fixing marine photosynthetic bacterium Rhodopseudomonas marina, variety agilis (1986)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 36 (1986), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Rhodopseudomonas marina/agilis was enriched from a natural microbial mat by using conditions that favor growth of anoxygenic photoheterotrophs able to fix N2 rapidly. The isolated bacterium grows more readily on fructose or mannitol than on organic acid carbon sources, requires preformed biotin and thiamine as growth factors, and is extraordinarily motile; growth occurs up to a temperature of approx. 44°C. The photosynthetic pigments of R. marina/agilis are housed in intracytoplasmic lamellar membranes which show the in vivo absorbance characteristics of bacteriochlorophyll a and carotenoids of the normal spirilloxanthin series. In common with other non-sulfur purple bacteria, R. marina/agilis can also grow as an aerobic heterotroph in darkness. Under these conditions, photopigment synthesis is severely repressed. R. marina/agilis requires 1–5% NaCl for optimal growth, and cells grown on N2 showed nitrogenase activity of 〉1000 nmol acetylene reduced h/mg dry wt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1986.tb01675.x
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  • 3
    Electronic Resource
    Electronic Resource
    Characterization of Rhodopseudomonas sphaeroides strain ‘cordata/81-1’ (1983)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 17 (1983), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1983.tb00428.x
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  • 4
    Electronic Resource
    Electronic Resource
    Photosynthetic and quasi-photosynthetic bacteria (1993)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 112 (1993), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract The term photosynthesi was coined in 1893 to represent the light-dependent conversion of CO2 and water to organic compounds and molecular oxygen. Despite the discovery in 1907 that bacteriochlorophyll-containing purple bacteria do not produce molecular oxygen and can grow on organic carbon sources using light as the energy source, photosynthesis is still frequently defined as an oxygenic autotrophic process. The meanings of the terms photosynthesis and phototrophy have become increasingly obfuscated, especially by the recent isolation of a number of aerobic bacterial species which produce bacteriochlophyll but appear unable to use light as an energy source for appreciable biosynthesis. This paper focuses on the importance of formulating a more precise definition of photosynthesis, and thereby forcesrecognition of the existence of a class of ‘quasi-photosynthetic’ bacterial species whose bioenergetic patterns require further analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1993.tb06414.x
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  • 5
    Electronic Resource
    Electronic Resource
    Sulphur isotopic compositions of deep-sea hydrothermal vent animals (1983)
    [s.l.] : Nature Publishing Group
    Nature 306 (1983), S. 51-52 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Dried (60 C) samples of vestimentiferan (Riftia pachyptila Jones) and clam (Calyptogena magnified Boss and Turner) tissues were obtained from Scripps Oceanographic Institution; muscle was dissected from dried crab (Bythograea thermydrori) claws obtained from the University of California, Santa ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/306051a0
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  • 6
    Electronic Resource
    Electronic Resource
    Phototaxis and other sensory phenomena in purple photosynthetic bacteria (1995)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology reviews 16 (1995), S. 0 
    Details
    ISSN: 1574-6976
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract: The mechanisms employed by purple photosynthetic bacteria to convert light to utilizable chemical energy have been a major focus of research over the past 50 years. Utilization of light by photosynthetic bacteria for other purposes, however, has received relatively little attention. The recent discovery of phototaxis by Rhodospirillum centenum provides new opportunities for biochemical and molecular biological analysis of sensory processes in purple bacteria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6976.1995.tb00176.x
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  • 7
    Electronic Resource
    Electronic Resource
    Conservation of the photosynthesis gene cluster in Rhodospirillum centenum (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 6 (1992), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Intraspecies and intergenus complementation analysis were utilized to demonstrate that photosynthesis genes are clustered in distantly related purple photo-synthetic bacteria. Specifically, we show that the linkage order for genes involved in bacteriochlorophyll and carotenoid biosynthesis in Rhodospirillum centenum are arranged essentially as in Rhodobacter capsulatus and Rhodobacter sphaeroides. In addition, the location and relative distance observed between the puf and puh operons which encode for light harvesting and reaction-centre structural genes are also conserved between these species. Conservation of the photosynthesis gene cluster implies either that there are structural or regulatory constraints that limit rearrangement of the photosynthesis gene cluster or that there may have been lateral transfer of the photosynthesis gene cluster among different species of phototrophic bacteria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2958.1992.tb01445.x
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  • 8
    Electronic Resource
    Electronic Resource
    Enrichment of purple photosynthetic bacteria from earthworms (1992)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 91 (1992), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Numerous bacteria present in soil during its passage through the alimentary canal of earthworms resist digestive action and the antimicrobial defenses of the worms. Thus, several kinds of non-sulfur purple photosynthetic bacteria (Rhodospirillaceae) can be enriched from ‘purees’ of washed earthworms (or from intestinal contents of the worms) using a procedure that exploits the capacity to fix N2 during anaerobic phototrophic growth with organic acid carbon sources. It appears that earthworm enrichments can be designed to provide highly selective methods for isolation of Rhodomicrobium vannielli and Rhodopseudomonas palustris, and perhaps of other purple bacteria. The extensive burrowing activities of earthworms undoubtedly contributes to the widespread dissemination of Rhodospirillaceae in soils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1992.tb05219.x
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  • 9
    Electronic Resource
    Electronic Resource
    Physiological properties of the thermotolerant photosynthetic bacterium, Rhodospirillum centenum (1990)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 67 (1990), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Rhodospirillum centenum nov. sp., isolated from Thermopolis Hot Springs (Wyoming), is a thermotolerant non-sulfur purple photosynthetic bacterium that forms desiccation- and heat-resistant cysts under certain nutritional conditions. Phototrophic growth rate is optimal over the temperature range ca. 39–45°C, and the maximum growth temperature is ca. 47°C. The bacterium requires biotin and vitamin B12, and grows readily in synthetic media. Growth rate, however, is markedly stimulated by unknown organic compounds in Soytone and similar preparations from soybeans. Dried cysts of R. centenum show high resistance to heating at 55–75°C for 48 h, suggesting that cysts provide a mechanism for survival and species dispersal in natural thermal environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1990.tb13851.x
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  • 10
    Electronic Resource
    Electronic Resource
    The use of two-dimensional gradient plates in determining the responses of non-sulphur purple bacteria to pH and NaCl concentration (1986)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 37 (1986), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Chemical gradients can easily be established in agar gels to test behaviour of bacteria in respect to two variables. Agar plates with pH and NaCl gradients have provided a simple technique for useful comparison of heterotrophic bacteria and the present paper extends observations to non-sulphur purple photosynthetic bacteria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1986.tb01826.x
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