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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
    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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  • 5
    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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  • 6
    Electronic Resource
    Electronic Resource
    Exploitation of N2-fixation capacity for enrichment of anoxygenic photosynthetic bacteria in ecological studies (1985)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 31 (1985), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract A procedure is described for the selective enrichment of anoxygenic photosynthetic bacteria from diverse natural sources containing numerous types of microorganisms. The enrichment medium contains a mixture of organic acid carbon sources, and the conditions used favor the growth of organisms that can multiply relatively rapidly anaerobically with N2 as the nitrogen source and light as the source of growth energy; the development of oxygenic cyanobacteria is effectively excluded.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1985.tb01166.x
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  • 7
    Electronic Resource
    Electronic Resource
    Increased activity of respiratory enzymes from photosynthetically grown Rhodopseudomonas capsulata in response to small amounts of oxygen (1983)
    Springer
    Archives of microbiology 134 (1983), S. 324-328 
    Details
    ISSN: 1432-072X
    Keywords: Rhodopseudomonas capsulata ; Continuous culture ; Respiratory chain ; Oxygen uptake ; α-Ketoglutarate dehydrogenase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Assays were performed on the components of the respiratory chain enzyme complex and the citric acid cycle enzyme α-ketoglutarate dehydrogenase (EC 1.2.4.2) from membrane preparations of Rhodopseudomonas capsulata grown in continuous culture. Cells were grown photoheterotrophically then switched to a chemoheterotrophic growth mode. NADH-and succinate-dependent oxygen uptake activities and cytochrome c oxidase (EC 1.9.3.1) activity were 5–6-fold higher in chemotrophically grown cells. The activities of NADH dehydrogenase (EC 1.6.99.3) and succinate dehydrogenase (EC 1.3.99.1) did not differ greatly between the two growth modes, and it is suggested that in respiratory chain electron flow the cytochrome c oxidase segment catalyses the rate limiting step. In addition, a 5-fold increase in α-ketoglutarate dehydrogenase activity was observed after the transition from a phototrophic to chemotrophic growth mode. Oxidase and α-ketoglutarate dehydrogenase activities increased 3–4-fold in phototrophically growing cultures exposed to a low partial pressure of oxygen (50 Pa; 1 atmosphere = 1.013×105 Pa). The data suggest that this small amount of oxygen exerts a significant effect on aerobic bioenergetic enzymes, even during phototrophic growth of Rhodopseudomonas capsulata.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00407811
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  • 8
    Electronic Resource
    Electronic Resource
    Heliobacterium chlorum, an anoxygenic brownish-green photosynthetic bacterium containing a “new” form of bacteriochlorophyll (1983)
    Springer
    Archives of microbiology 136 (1983), S. 11-16 
    Details
    ISSN: 1432-072X
    Keywords: Heliobacterium chlorum ; Bacterial photosynthesis ; Bacteriochlorophyll g-N2 fixation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Heliobacterium chlorum is a brownish-green anoxygenic photosynthetic bacterium, isolated from surface soil. It fixes N2 readily, and contains a hitherto unknown form of bacteriochlorophyll (Bchl). The latter, designated as BchlgGg, shows a major absorbancy peak in vivo at 788 nm. As yet, the subcellular localization of the photosynthetic pigment is uncertain; neither chlorosomes nor extensively developed intracytoplasmic membranes of the kind produced by most photosynthetic bacteria are observed in electron micrographs of thin sections. H. chlorum grows rapidly as a mesophilic photoheterotroph, requires biotin as an essential growth factor, and appears to move by gliding motility. The bacterium is unable to grow aerobically in darkness, and photosynthetic growth is severely inhibited by molecular oxygen. The extreme O2-sensitivity of H. chlorum may be related to its low content of (neurosporene-like) carotenoid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00415602
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  • 9
    Electronic Resource
    Electronic Resource
    Obligately halophilicChromatium vinosum from Hamelin Pool, Shark Bay, Australia (1986)
    Springer
    Current microbiology 14 (1986), S. 335-339 
    Details
    ISSN: 1432-0991
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract A representative of the purple sulfur bacteria was isolated from organic-rich intertidal sediments of Hamelin Pool, Shark Bay, Australia. The isolate, strain HPC, is nutritionally versatile, being capable of photoheterotrophic growth in the absence of reduced sulfur sources and of dark microaerophilic growth, either heterotrophically or lithotrophically. Vitamins are not required. Nine organic carbon substrates, including the C2−C5 fatty acids, support photoheterotrophic growth. The isolate is an obligate halophile capable of growth over a wide salinity range (0.5%–8.5% NaCl). On the basis of its morphology, physiology, pigmentation, and DNA base ratio, strain HPC is considered to be an obligately halophilic representative ofChromatium vinosum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01568700
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