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  • 1
    Electronic Resource
    Electronic Resource
    Nitrogen Fixation by Photosynthetic Microorganisms (1973)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Microbiology 27 (1973), S. 283-316 
    Details
    ISSN: 0066-4227
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.mi.27.100173.001435
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  • 2
    Electronic Resource
    Electronic Resource
    Some Aspects of Structure and Function in N Fixing Cyanobacteria (1980)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Microbiology 34 (1980), S. 497-536 
    Details
    ISSN: 0066-4227
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.mi.34.100180.002433
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  • 3
    Electronic Resource
    Electronic Resource
    Osmotic responses of unicellular blue-green algae (cyanobacteria): changes in cell volume and intracellular solute levels in response to hyperosmotic treatment (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 9 (1986), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Changes in cell volume and solute content upon hyperosmotic shock have been studied for six unicellular blue-green algae (cyanobacteria): Synechococcus PCC 6301, PCC 6311; Synechocystis PCC 6702, PCC 6714, PCC 6803 and PCC 7008. The extent of change in volume was shown to be dependent upon the solute used to establish the osmotic gradient, with cells in NaCl showing a reduced shrinkage when compared to cells in media containing added sorbitol and sucrose. Uptake of extracellular solutes during hyperosmotic shock was observed in Synechocystis PCC 6714, with maximum accumulation of external solutes in NaCl and minimum solute uptake in sucrose solutions. Conversely, solute loss from the cells (K+ and amino acids) was greatest in sucrose-containing media and least in NaCl. The results show that these blue-green algae do not behave as ‘ideal osmometers’ in media of high osmotic strength. It is proposed that short-term changes in plasmalemma permeability in these organisms may be due to transient membrane instability resulting from osmotic imbalance between the cell and its surrounding fluid at the onset of hyperosmotic shock.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1365-3040.ep11612699
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  • 4
    Electronic Resource
    Electronic Resource
    NEW TRENDS IN THE CHEMISTRY OF NITROGEN FIXATION (Book). (1982)
    Oxford, UK : Blackwell Publishing
    Plant, cell & environment 5 (1982), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1365-3040.ep11571409
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  • 5
    Electronic Resource
    Electronic Resource
    The compatibility of osmotica in cyanobacteria (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 11 (1988), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract. The solutes accumulated by cyanobacteria in response to hyper-osmotic stress include Na+, K+, sucrose, trehalose, glucosyl-glycerol, glyeine betaine and glutamate betaine. The compatibility of several of these solutes with glutamine synthetase activity has been examined using cell-free extracts from a range of freshwater, marine and halotolerant cyanobacteria. All of the solutes tested were compatible with (i.e. non-inhibitory to) enzymic activity at physiological concentrations and the results demonstrate a rank order of compatibility which correlates with the concentrations at which the organic solutes occur in cyanobacteria, i.e. glycine betaine 〉 polyol-derivatives 〉 disaccharides and with the upper salinity limit for growth. The protection against inhibition by NaCl (halo-protection) afforded by these solutes to enzymic activity was also examined. Only glycine betaine was found to exert a significant halo-protective effect and this may be explained by differences in the mechanism of compatible solute function between small charged molecules and sugars/polyols.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1365-3040.ep11604910
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  • 6
    Electronic Resource
    Electronic Resource
    Phosphorus availability and nitrogenase activity in aquatic blue-green algae (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 1 (1971), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Metabolically active phosphorus-starved cultures of blue-green algae assimilate 32P rapidly in the light and in the dark. The uptake of phosphorus results in a rapid (within 15 min) stimulation in acetylene reduction by Anabaena cylindrica, A. flosaquae, Anabacnopsis circuiaris and Chlorogloea fritschii, with a response being obtained to less than 5 μg/1 of phosphorus. Uptake of phosphorus also causes a rapid increase in respiration in the dark but not in photo respiration, and the size of the cellular ATP pool and the 14CO2 fixation rate both increase more slowly. The metabolism of phosphorus-sufficient cells, which assimilate phosphorus more slowly, shows little response when phosphorus is provided.Excess phosphorus is stored in the vegetative cells of blue-green algae as polyphosphate bodies which may form within 60 min of adding phosphorus to phosphorusstarved cells and which serve as a source of phosphorus for the algae when exogenous phosphorus is limiting. Preliminary results from Scottish waters suggest that urban effluents are important sources of available-phosphorus for algal growth and that the levels entering fresh waters from agricultural land are, per unit volume, lower. In both types of water the levels of available-phosphorus are rather similar to the levels of orthophosphate-phosphorus present. Most detergents tested serve as a source of phosphorus for nitrogen-fixing blue-green algae and cause a rapid stimulation in reduction when added to phosphorus-starved cultures. Of the detergents assayed, the biological types were richest in available phosphorus. The addition of detergents may result in a rapid increase in number of polyphosphate bodies present in the algae. Detergents in general also contain an inhibitor of algal metabolism. Whether a stimu-lation or an inhibition occurs depends on the quantities of detergent added and on whether or not the alga is phosphorus-deficient.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1971.tb01570.x
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  • 7
    Electronic Resource
    Electronic Resource
    Bloom-forming cyanobacterium Microcystis aeruginosa overwinters on sediment surface (1980)
    [s.l.] : Nature Publishing Group
    Nature 288 (1980), S. 365-367 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] On 19 August 1976, HkgNaNO3 (enriched with 9.63 atom% excess 15N) and 789 g KH2PO4 (N : P atomic ratio, 10:1) were dissolved and sprayed onto the surface waters of an 18,500m3 experimental enclosure (45.7m diameter, 12m deep)9 in Blelham Tarn in the English Lake District when the waters were ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/288365a0
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  • 8
    Electronic Resource
    Electronic Resource
    Experimental phycology (1979)
    [s.l.] : Nature Publishing Group
    Nature 278 (1979), S. 484-485 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] ALGAE serve as experimental tools for physiologists, biochemists, molecular biologists, organic chemists and so on, but the experimental techniques which these workers use are scattered throughout the literature. In 1967 the Phycological Society of America had the good sense to promote the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/278484b0
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  • 9
    Electronic Resource
    Electronic Resource
    Nitrogenase Activity in Heterocysts of Blue–Green Algae (1969)
    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 226-228 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The firm identification of the heterocysts as the sites of nitrogenase activity marks them out also as the site of nitrogen fixation in blue green ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/224226a0
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  • 10
    Electronic Resource
    Electronic Resource
    Modifications of nitrogen-fixing algae in lichen symbioses (1977)
    [s.l.] : Nature Publishing Group
    Nature 265 (1977), S. 371-372 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Comparison of symbiotic and free-living Nostoc spp. by light and electron microscopy showed that with P. aphthosa, which also contains a green alga (Coccomyxa sp.) and a fungus (an ascomycete) as symbiotic partners, the heterocyst frequency of the symbiotic Nostoc was 21% while that of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/265371a0
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