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  • Glucosylglycerol  (3)
  • 2015-2019
  • 1990-1994  (2)
  • 1985-1989  (1)
  • 1950-1954
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  • 2015-2019
  • 1990-1994  (2)
  • 1985-1989  (1)
  • 1950-1954
  • 1995-1999  (1)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 153 (1990), S. 405-408 
    ISSN: 1432-072X
    Keywords: Cyanobacteria ; Exudation ; Salt stress ; Glucosylglycerol ; Synechocystis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract When cells of Synechocystis, adapted to 684 mmol/l NaCl, were exposed to hypoosmotic shock by reducing NaCl concentration to more than 250 mmol/l, significant amounts of organic material were liberated which could be increased by increasing shock strength. After maximal hypoosmotic shock (684 mmol/l→ 2 mmol/l NaCl) 40–50% of photosynthetically labelled organic material occurred in the surrounding medium. The main compound exudates was the osmoprotective compound glucosylglycerol. Minor exudates were amino acids, organic acids and carbohydrates. In contrast a hyperosmotic shock (2 mmol/l→684 mmol/l NaCl) liberated only one fourth of the amount liberated by a hypoosmotic shock.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-072X
    Keywords: Cyanobacteria ; Glucosylglycerol ; Random cartridge mutagenesis ; Salt tolerance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Three mutants of the cyanobacterium Synechocystis sp. PCC 6803 unable to tolerate high salt concentrations were generated using random cartridge mutagenesis. Analysis of the phenotypes revealed that the salt sensitivity of one mutant (6803/143) is caused by a block in the synthesis of the osmoprotective substance glucosylglycerol, while in the two other mutants no physiological defect could be detected which was responsible for the loss of salt tolerance. Southern hybridization analyses and cloning of the integration sites of the resistance marker demonstrated that different genes are affected in each of the three mutants.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 148 (1987), S. 275-279 
    ISSN: 1432-072X
    Keywords: Cyanobacteria ; Microcystis ; Glucosylglycerol ; Salt adaptation ; Synthesis rate ; Turnover
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The unicellular cyanobacterium Microcystis furma tolerates salinity by accumulating the osmoprotective compound glucosylglycerol. After salt shock, the initial rate of glucosylglycerol synthesis is independent of the NaCl concentration used. In pulse chase experiments with NaH14CO3, synthesis of glucosylglycerol by salt-adapted cells was found to be rapid, whereas no sign of its breakdown was detected. Therefore, it is concluded that no turnover of glucosylglycerol takes place in salt-adapted cells. The specific capacity of the glucosylglycerol-forming enzyme system may be one reason for the salt resistance limit.
    Type of Medium: Electronic Resource
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