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  • Electronic Resource  (3)
  • 1980-1984  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Bacterial scavenging: Utilization of fatty acids localized at a solid-liquid interface (1982)
    Springer
    Archives of microbiology 133 (1982), S. 257-260 
    Details
    ISSN: 1432-072X
    Keywords: Bacterial scavenging ; Surface localized nutrients ; Leptospira ; Serratia ; Hydrophobic interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A model oligotrophic aquatic system involving localization of fatty acids on a solid surface was used to quantitate scavenging by three bacteria; Leptospira biflexa patoc 1 which adheres reversibly, pigmented Serratia marcescens EF190 which adheres irreversibly, and a non-pigmented hydrophilic mutant of EF190. The Leptospira and pigmented Serratia displayed two distinct scavenging strategies which are related to their different methods of adhesion. The Leptospira efficiently scavenged [1-14C] stearic acid from the surface in 24 h, whereas the pigmented hydrophobic Serratia initially showed a faster rate of removal but the overall rate was considerably slower than that of the Leptospira. The hydrophilic, non-pigmented Serratia required 50h incubation to remove significant amounts of the labelled fatty acid. The greater scavenging ability of the hydrophobic pigmented Serratia strain compared to the hydrophilic non-pigmented mutant could not be attributed to differences in viability of fatty acid metabolism. The hydrophobicity of the pigmented Serratia allows for firmer adhesion and greater interaction with the surface localized nutrients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00521286
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Continuous observations of bacterial gliding motility in a dialysis microchamber: The effects of inhibitors (1980)
    Springer
    Archives of microbiology 124 (1980), S. 169-175 
    Details
    ISSN: 1432-072X
    Keywords: Flexibacter sp. ; Gliding motility ; Dialysis microchamber ; Inhibitors ; Membrane potentials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Use of a dialysis microchamber has allowed continuous observations on the same set of gliding bacteria during changes in the composition of the perfused medium. This procedure has revealed the presence of an adaptive, cyanide-insensitive metabolic pathway, which allows cyanide-treated Flexibacter BH3 to begin gliding again at a reduced rate when glucose is the substrate. In addition, it has revealed that individual flexibacter cells can maintain their gliding motility for up to 20 h in the absence of exogenous substrate. Gliding in Flexibacter BH3 was prevented by those inhibitors blocking the electron transport process. Inhibitors of glucose metabolism did not prevent motility, since the flexibacters obviously metabolize endogenous substrate under such circumstances. Proton ionophores, which induce membrane depolarization, rapidly inhibited gliding in Flexibacter BH3. This inhibition was irreversible in the case of gramicidin S. Gliding was not inhibited by cytochalasin B or antiactin antibody. High concentrations of Ca2+ were particularly inhibitory to the gliding process. The significance of these results is discussed in relation to a possible mechanism of gliding involving the generation of rhythmical contractions in the outer cell membrane of Flexibacter BH3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00427723
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Budding and prosthecate bacteria from freshwater habitats of various trophic states (1980)
    Springer
    Microbial ecology 5 (1980), S. 245-251 
    Details
    ISSN: 1432-184X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Budding and prosthecate bacteria were enumerated in spring and summer by viable counting procedures in several freshwater habitats in Australia including oligotrophic lakes, a mesotrophic lake, and eutrophic ponds.Caulobacter spp. were the most numerous type encountered. They were present in the highest concentrations (exceeding 1000/ml) in the mesotrophic lake during the summer. Their proportion to total viable heterotrophic bacteria was also highest (35.1 to 37.7) in this habitat. From 17 to 330/mlCaulobacter spp. were counted in the eutrophic habitats where their proportion to total viable numbers was less than 1.0%. In the oligotrophic lakes they varied from 5 to 23/ml and comprised greater than 5% of the total viable count.Hyphomicrobium- like bacteria were also numerous in the mesotrophic lake and in one oligotrophic lake during the summer sampling period.Ancalomicrobium spp. occurred in high concentrations (130/ml) in the mesotrophic lake. Budding bacteria of thePlanctomyces-Pasteuria group were most numerous in the eutrophic habitats where as many as 240/ml were counted; their proportion to total heterotrophs remained relatively constant regardless of trophic state, however. A similar pattern was observed withProsthecobacter spp.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02020332
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    Paper (German National Licenses)
    Fulltext
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