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  • 1
    ISSN: 0300-9084
    Keywords: adaptation chromatique ; chromatic adaptation ; chromophores ; cyanobacterie ; cyanobacterium ; phycobiliproteines ; phycobiliproteins
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 87 (1972), S. 303-322 
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A facultative photo- and chemoheterotroph, the unicellular bluegreen alga Aphanocapsa 6714, dissimilates glucose with formation of CO2 as the only major product. A substantial fraction of the glucose consumed is assimilated and stored as polyglucose (probably glycogen). The oxidation of glucose proceeds through the pentose phosphate pathway. The first enzyme of this pathway, glucose-6-phosphate dehydrogenase, is partly inducible. In addition, the rate of glucose oxidation is controlled, at the level of glucose-6-phosphate dehydrogenase function, by the intracellular level of an intermediate of the Calvin cycle, ribulose-1,5-diphosphate, which is a specific allosteric inhibitor of this enzyme. As a consequence, the rate of glucose oxidation is greatly reduced by illumination, an effect reversed by the presence of DCMU, an inhibitor of photosystem II. Two obligate photoautotrophs, Synechococcus 6301 and Aphanocapsa 6308, produce CO2 from glucose at extremely low rates, although their levels of pentose pathway enzymes and of hexokinase are similar to those in Aphanocapsa 6714. Failure to grow with glucose appears to reflect the absence of an effective glucose permease. A general hypothesis concerning the primary pathways of carbon metabolism in blue-green algae is presented.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 87 (1972), S. 93-98 
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Thirty eight axenic strains belonging to the Chroococcales were screened for the ability to grow photoheterotrophically in the light with glucose in the presence of 10-5 M DCMU, which inhibits photoautotrophic growth. Seven strains could do so, and four of them could also grow chemoheterotrophically, though more slowly, with glucose in the dark. Six are members of the genus Aphanocapsa and one of the genus Chlorogloea. The remaining 31 strains examined appear to be obligate photoautotrophs. A quantitative study of the growth behaviour of one strain, Aphanocapsa 6714, fully confirmed its facultative photoheterotrophy and chemoheterotrophy.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The fatty acids of 32 axenic strains of filamentous blue-green algae have been analyzed. As an aid to the interpretation of the results, the strains have been assigned to provisional typological groups based upon their morphology and certain physiological characters. The latter are the ability to grow heterotrophically in the dark with glucose as carbon and energy source, the ability to grow in the light at the expense of glucose in the presence of 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU), and the ability to synthesize nitrogenase under anaerobic conditions in the light. Each typological group has been given an appropriate generic name. The strains examined for fatty acid composition can be divided into groups according to the major fatty acid of highest degree of unsaturation found in each strain as was done for the unicellular strains examined previously in this laboratory. Four metabolic groups of strains of unicellular and filamentous blue-green algae can be recognized: 1. those in which there is little or no desaturation of oleate; 2. those in which linoleate is desaturated toward the ω-end of the molecule to give α-linolenate; 3. those in which linoleate is desaturated toward the carboxyl end of the molecule to give γ-linolenate; 4. those in which octadecatetraenoate is synthesized. The nature of the major cellular fatty acids of two of the strains examined is the same whether growth is in the light or in the dark on glucose. All filamentous strains contain glycolipids with the properties of mono- and digalactosyldiglycerides.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 100 (1974), S. 419-436 
    ISSN: 1432-072X
    Keywords: Gloeobacter violaceus ; Photosynthetic Pigments ; DNA Base Composition ; Fatty Acid Composition ; Cyanobacterium ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Gloebacter violaceus gen. and sp. n. is a unicellular photosynthetic prokaryote of unusual cellular structure. The only unit membrane in the small, rod-shaped cells is the cytoplasmic membrane, which has a simple contour, without intrusions. Immediately underlying it is an electron-dense layer 80 nm thick. Gloeobacter is an aerobic photoautotroph which contains chlorophyll α, β-carotene and other carotenoids, allophycocyanin, phycocyanin and phycoerythrin. Chlorophyll and carotenoids are associated with the particulate fraction of cell-free extracts, and are thus probably localized in the cytoplasmic membrane. The phycobiliproteins may be associated with the electron-dense 80 nm layer. The DNA contains 64.4 moles percent GC. The cellular lipids have a high content of polyunsaturated fatty acids, largely linoleate and γ-linolenate. Despite its atypical fine structure, Gloeobacter is evidently a cyanobacterium, sufficiently different from other unicellular cyanobacteria to be placed in a new genus.
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 2 (1977), S. 0 
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1572-9699
    Keywords: cyanobacteria ; Gloeothece ; sheath ; sulfated polysaccharide ; electron spectroscopic imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cells of the unicellular cyanobacteriumGloeothece sp. PCC 6909 are surrounded by an inner (enclosing 1–2 cells) and an outer (enclosing cell groups) sheath. Using conventional Epon-embedding in combination with ruthenium-red staining, the inner and outer sheaths appeared similar and displayed multiple bands of electron-dense subunits. However, embedding in Nanoplast resin to avoid shrinkage led to the detection of two distinct zones (inner and outer zone) each with several distinct layers. The zone delimited by the electron-dense thick inner sheath layer, and the zone enclosed by the thin electron-dense outer sheath layer, are composed of a homogeneous material of little electron-contrast. Whereas the outer zone appears to be of even contrast, the inner zone is characterized by a distinct electron-transparent layer. Element distribution analysis revealed that the electron-transparent layer contained relatively large amounts of sulfur, carbon, and oxygen but only little nitrogen. Inner and outer sheath fractions were isolated by differential mechanical cell breakage and centrifugation. The outer sheath fraction was less hydrated than the inner one. The two fractions differed little in their contents of uronic acids, carbohydrate and protein, although the outer sheath fraction contained less sulfate. A soluble polysaccharide with a chemical composition similar to that of inner and outer sheath fractions was also obtained from the culture supernatant.
    Type of Medium: Electronic Resource
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