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  • 1
    Electronic Resource
    Electronic Resource
    Osmoregulation and cell composition in salt-adaptation of Nostoc muscorum (1982)
    Springer
    Archives of microbiology 132 (1982), S. 168-172 
    Details
    ISSN: 1432-072X
    Keywords: Nostoc muscorum ; Cyanobacteria ; Osmoregulation ; Salt-adaptation photosynthesis ; N2-fixation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Adaptation to salt in the cyanobacterium Nostocmuscorum, is composed of a few mechanisms which together lead to the generation of a salt-tolerant cell. The initial mechanism combines a stimulation of photosynthetic activity with the accumulation of sucrose as an osmoregulator. The secondary mechanism involves the adaptation of N2 fixation activity and protein biosynthesis. The adaptation is most efficient in response to NaCl-induced stress and functions only partially under stress induced by either KCl or a nonionic osmoticum such as mannitol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00508725
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  • 2
    Electronic Resource
    Electronic Resource
    Modulation of cell surface hydrophobicity in the benthic cyanobacterium Phormidium J-1 (1985)
    Springer
    Archives of microbiology 142 (1985), S. 21-27 
    Details
    ISSN: 1432-072X
    Keywords: Cell-surface modulation ; Hydrophobicity ; Cyanobacteria ; Phormidium J-1
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A shift from cell-surface hydrophobicity to hydrophilicity was experimentally induced in the benthic hydrophobic cyanobacterium Phormidium sp. strain J-1, by mechanical shearing, chloramphenicol, and proteolytic treatment after preincubation with sodium dodecyl sulfate (SDS). Treatment with SDS alone, while releasing large amounts of protein and carbohydrates from the cell wall, did not affect cell surface hydrophobicity. Ultrastructural analysis showed the cells, to be enveloped by a double-layered minicapsule. Treatments affecting cellsurface hydrophobicity also caused changes in capsular components. A model, describing cell-surface structure, composition and properties in Phormidium J-1, was constructed by correlating ultrastructural data with surface properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00409231
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Structural aspects of the adaptation of Nostoc muscorum to salt (1982)
    Springer
    Archives of microbiology 132 (1982), S. 163-167 
    Details
    ISSN: 1432-072X
    Keywords: Cyanobacteria ; Nostoc muscorum ; Cell envelope ; Thylakoids ; Heterocysts ; Salt adaptation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The physiological and biochemical changes during the adaptation of Nostoc muscorum to salt are accompanied by specific structural changes. Cells of Nostoc muscorum exposed to saline medium vary in size and envelope organization. There are also drastic changes in the intracellular organization of the thylakoidal assembly. The heterocysts exhibit a preferential tolerance to NaCl rather than mannitol. These findings suggest that Nostoc muscorum is equipped with a specific physiological capacity for NaCl tolerance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00508724
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Glutathione reductase activity in heterocysts and vegetative cells of the cyanobacterium Nostoc muscorum (1984)
    Springer
    Archives of microbiology 140 (1984), S. 215-217 
    Details
    ISSN: 1432-072X
    Keywords: Glutathione reductase ; Cyanobacteria ; Nostoc muscorum ; O2 protection ; Glutathione ; Nitrogen fixation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Glutathione reductase activity was detected and characterized in heterocysts and vegetative cells of the cyanobacterium Nostoc muscorum. The activity of the enzyme varied between 50 and 150 nmol reduced glutathione· min-1·mg protein-1, and the apparent Km for NADPH was 0.125 and 0.200 mM for heterocysts and vegetative cells, respectively. The enzyme was found to be sensitive to Zn+2 ions, however, preincubation with oxidized glutathione rendered its resistance to Zn+2 inhibition. Nostoc muscorum filaments were found to contain 0.6–0.7mM glutathione, and it is suggested that glutathione reductase can regenerate reduced glutathione in both cell types. The combined activity of glutathione reductase and isocitrate dehydrogenase in heterocysts was as high as 18 nmol reduced glutathione·min-1·mg protein-1. A relatively high superoxide dismutase activity was found in the two cell types; 34.2 and 64.3 enzyme units·min-1·mg protein-1 in heterocysts and vegetative cells, respectively. We suggest that glutathione reductase plays a role in the protection mechanism which removes oxygen radicals in the N2-fixing cyanobacterium Nostoc muscorum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00454930
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  • 5
    Electronic Resource
    Electronic Resource
    Fructose supports glycogen accumulation, heterocysts differentiation, N2 fixation and growth of the isolated cyanobiont Anabaena azollae (1986)
    Springer
    Archives of microbiology 145 (1986), S. 187-190 
    Details
    ISSN: 1432-072X
    Keywords: Anabaena azollae ; Fructose uptake ; Mixotrophic growth ; Cyanobacteria ; Glycogen ; Heterocysts ; Nitrogenase ; Glucose-6-phosphate dehydrogenase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cells of the cyanobiont Anabaena azollae isolated from the water fern Azolla filiculoides were found to take up and utilize fructose in the light for mixotrophic growth. Fructose was favored by the cyanobiont as a substrate over sucrose and glucose. Cell growth in the presence of 8 mM fructose led to glycogen accumulation in the cells which approached 20% of the cell dry weight within 2 to 3 days, followed by reduction of glycogen content during the fourth day. Glucose-6-phosphate dehydrogenase activity was increased 5–6-fold in the fructose grown cells from the third day of growth onwards. The frequency of heterocysts in fructose-grown cells increased from 6 to 18%, and acetylene reduction by nitrogenase was increased 3-fold in the presence of fructose as compared with control cells, with maximum values observed between the third and fifth day of mixotrophic growth. Fructose-supported growth yielded a 2–4-fold increase in cell dry weight over controls. It is suggested that fructose-supported development and growth of the cyanobiont in batch cultures may resemble its mixotrophic growth and development in situ in the leaf cavity of the host fern Azolla.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00446778
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  • 6
    Electronic Resource
    Electronic Resource
    Cyanobacterial biomass production in saline media (1985)
    Springer
    Plant and soil 89 (1985), S. 107-116 
    Details
    ISSN: 1573-5036
    Keywords: Cyanobacteria ; Ferredoxin-NADP reductase ; Malate dehydrogenase ; Respiration ; Salt tolerance ; Spirulina subsalsa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The cultivation, growth patterns, and physiological activities of the marine cyanobacterium (blue-green alga)Spirulina subsalsa were studied. A comparison of its growth in three different media (diluted seawater, seawater, and seawater +0.5M NaCl) revealed a faster growth in the hypersaline medium. In the hypersaline medium, the culture was homogeneous, in contrast to the aggretates formed in the lower-salt media. Enzymic analysis of the cells demonstrated selective sensitivity of soluble malate dehydrogenase to sodium ions, while chloride ions or nonionic solutes caused no inhibition. The membrane-associated enzyme ferredoxin-NADP reductase was only partially sensitive to sodium ions. The respiratory enzymes exhibited well-coupled activity, and faster respiration was observed with the preparation from the hypersaline culture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02182237
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