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  • 1
    Electronic Resource
    Electronic Resource
    Biotype of the purple nonsulfur photosynthetic bacterium, Rhodospirillum centenum (1996)
    Springer
    Archives of microbiology 165 (1996), S. 91-96 
    Details
    ISSN: 1432-072X
    Keywords: Key words Phototaxis ; R-bodies ; Cysts ; Swarming ; motility ; Photopigment synthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Rhodospirillum centenum exhibited a number of general properties typically observed in nonsulfur purple bacteria, but also displayed a number of unusual characteristics that include: (1) conversion of the vibrioid/spiral cells to thick-walled cysts under certain growth conditions; (2) absence of O2 repression of photopigment synthesis; (3) synthesis of “R-bodies”; and (4) swarming motility on agar surfaces that allows macroscopic observation of colony phototaxis. The unusual characteristics indicate that Rsp.centenum will prove to be a valuable experimental system for investigating various basic problems, especially in connection with photosensory phenomena and the regulation of photopigment synthesis by dioxygen and light. The present comparative study of 13 strains was undertaken to further define the Rsp. centenum biotype.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002030050302
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Macroscopic phototactic behavior of the purple photosynthetic bacterium Rhodospirillum centenum (1995)
    Springer
    Archives of microbiology 163 (1995), S. 1-6 
    Details
    ISSN: 1432-072X
    Keywords: Rhodospirillum centenum ; Phototaxis ; Swarm colonies ; Action spectrum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Most photosynthetic microorganisms have the capability of photosensing light quality and intensity. Movement of motile photosynthetic microorganisms to locales that offer optimal physical and chemical conditions for light-dependent growth provides obvious selective advantages. Among phototrophs, many cyanobacteria and algae migrate towards or away from the direction of light, a process termed phototaxis. In contrast, anoxygenic photosynthetic bacteria are believed to respond to changes in light intensity in a manner that is not related to the direction of light, a process that is often described by the term “photophobic”. We recently reported that “swarm colonies” of the purple photosynthetic bacterium Rhodospirillum centenum are capable of macroscopically visible phototactic behavior. In the present study we further characterize the phototactic behavior of R. centenum swarm colonies and provide an action spectrum that delineates regions of the spectrum that elicit positive and negative phototaxis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00262196
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Macroscopic phototactic behavior of the purple photosynthetic bacterium Rhodospirillum centenum (1995)
    Springer
    Archives of microbiology 163 (1995), S. 1-6 
    Details
    ISSN: 1432-072X
    Keywords: Key wordsRhodospirillum centenum ; Phototaxis ; Swarm colonies ; Action spectrum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Most photosynthetic microorganisms have the capability of photosensing light quality and intensity. Movement of motile photosynthetic microorganisms to locales that offer optimal physical and chemical conditions for light-dependent growth provides obvious selective advantages. Among phototrophs, many cyanobacteria and algae migrate towards or away from the direction of light, a process termed phototaxis. In contrast, anoxygenic photosynthetic bacteria are believed to respond to changes in light intensity in a manner that is not related to the direction of light, a process that is often described by the term "photophobic". We recently reported that "swarm colonies" of the purple photosynthetic bacterium Rhodospirillum centenum are capable of macroscopically visible phototactic behavior. In the present study we further characterize the phototactic behavior of R. centenum swarm colonies and provide an action spectrum that delineates regions of the spectrum that elicit positive and negative phototaxis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00262196
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Phototactic purple bacteria (1994)
    [s.l.] : Nature Publishing Group
    Nature 370 (1994), S. 104-104 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - In 1883 T. Engelmann1 discovered that purple photosynthetic bacteria re-verse their swimming direction when the light intensity is suddenly reduced. He described this photosensory effect as "Schreckbewegung" ('movement of fright'), but it is more properly designated as a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/370104a0
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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