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  • 1
    Electronic Resource
    Electronic Resource
    Microbial sulfate reduction in acidic (pH 3) strip-mine lakes (1990)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 73 (1990), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract 35SO4 reduction was detected in slurries of sediments obtained from Reservoir 29 (pH 3.8) and Lake B (pH 6.2), two acid strip-mine lakes in Indiana. The rates varied seasonally and were higher in summer and fall than in the spring. The optimal pH for sulfate reduction in Reservoir 29 sediments was 5, but samples had increased activity at pH 7 within 24 h after adjusting the pH to this value. In Lake B, the optimal pH for sulfate reduction was the in situ pH (6.2). Sulfate reduction in both lakes was stimulated 2–3-fold by increasing pH2. High concentrations (5 mM) of organic acids inhibited sulfate reduction at pH 3.8, but stimulation was observed at concentrations of 0.1 mM. Acid-volatile sulfides accounted for about 70% of the products of 35SO4 reduction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1990.tb03941.x
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  • 2
    Electronic Resource
    Electronic Resource
    The upper temperature limit of Cyanidium caldarium (1970)
    Springer
    Archives of microbiology 72 (1970), S. 326-332 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Field observations of the natural habitats, the temperature maximum for 14CO2 incorporation of natural populations, and the temperature maximum for the growth of cultures of Cyanidium caldarium indicate that the upper temperature limit for C. caldarium is 55–60°C. These results are not compatible with the description of C. caldarium as an extreme thermophile.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00409031
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  • 3
    Electronic Resource
    Electronic Resource
    Requirement of low oxidation-reduction potential for photosynthesis in a blue-green alga (Phormidium sp.) (1975)
    Springer
    Archives of microbiology 104 (1975), S. 7-13 
    Details
    ISSN: 1432-072X
    Keywords: Photosynthesis ; Blue-Green Alga ; Phormidium sp. ; Oxidation-Reduction Potential ; Sulfide ; Hot Spring ; Stronatolite ; Anaerobiosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Photosynthesis in a Phormidium species which forms dense conical-shaped structures in thermal springs is strongly inhibited by aeration but is stimulated by sulfide and other agents (cysteine, thioglycolate, sulfite) which lower the oxidation-reduction potential. The compact structures which this alga forms in nature may restrict oxygen penetration from the environment so that the anaerobic or microaerophilic conditions necessary for photosynthesis can develop. The alga may be defective in a regulatory mechanism that controls the reoxidation of reduced pyridine nucleotides formed during photosynthesis. It is suggested that other mat-forming and benthic blue-green algae may also prefer anaerobic conditions for growth and photosynthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00447293
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