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  • 1
    ISSN: 1432-072X
    Keywords: Oscillatoria ; Cyanobacteria ; Glycogen ; Trehalose ; Fermentation ; Lactate ; Ethanol ; Acetate ; Sulfide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The marine nitrogen-fixing cyanobacterium Oscillatoria limosa, strain 23 (Oldenburg) was investigated with respect to its dark anaerobic metabolism. As soon as the cells were incubated anaerobically in the dark, they started to ferment. Glycogen was presumably degraded via the heterolactic fermentative pathway. Glycogen-glucose was degraded to equimolar amounts of lactate, ethanol and carbon dioxide. The disaccharide trehalose, which serves as an osmoprotectant in O. limosa, was also catabolized. Most probably, this compound was fermented almost exclusively to acetate. Some hydrogen was produced as well. In the presence of elemental sulfur, fermentative hydrogen production ceased and sulfide was produced instead. The presence of elemental sulfur had no effect on the amounts and ratios of the fermentation products produced.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-072X
    Keywords: Cyanobacteria ; Fermentation ; Lactate ; Acetate ; Ethanol ; Glycollate ; Formate ; Oxalate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An arbitrarily chosen selection of 37 cyanobacterial strains of the Oldenburg culture collection were tested for their ability of fermentation and secretion of fermentation products. In all examined strains at least one fermentation product could be detected. For the most part fermentation products were only shed in traces. Thus, for a large part of the investigated strains fermentation does not seem to be a sufficient metabolism to survive dark and anaerobic periods. Only five strains secreted remarkable amounts of products. Glycollate was mostly found in combination with formate and/or traces of oxalate. Lactate, ethanol and acetate were found in combination or single. Most of those strains sheding high amounts of glycollate and formate, did not show a remarkable lactate, ethanol or acetate excretion; those excreting high amounts of lactate, ethanol or acetate produced only minor volumes of glycollate and formate. It was not possible to find similar fermentation patterns by comparing fermentation of species belonging to the same family. Organisms fermenting or not fermenting could be found among marine, brackish and freshwater cyanobacteria. Fermentation, therefore seems to be a unique, and likely old capability among cyanobacteria, which was partly lost during evolution.
    Type of Medium: Electronic Resource
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