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  • 1
    Electronic Resource
    Electronic Resource
    Fragile sites and breakpoints in constitutional rearrangements and in human sperm chromosomes (1989)
    Springer
    Human genetics 〈Berlin〉 82 (1989), S. 330-334 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Recently, it has been suggested that an association exists between breakpoints involved in constitutional rearrangements and fragile sites; however, statistical analyses of this relationship are controversial. We have analyzed 1200 breakpoint from different constitutional rearrangements, 1522 breakpoints with respect to their recurrence and 217 breakpoints from sperm chromosomes as reported by several authors. The coincidence between breakpoints and fragile sites was 35.3%, 43.6% and 41.9% respectively. The statistical significance of these coincidences depends on whether factors such as the relative length of the bands or the recurrence of the rearrangements are taken into account.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00273992
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of inoculation with Azotobacter chroococcum on nitrogenase activity of Zea mays roots grown in agricultural soils under aseptic and non-sterile conditions (1988)
    Springer
    Biology and fertility of soils 6 (1988), S. 170-173 
    Details
    ISSN: 1432-0789
    Keywords: A. chroococcum ; Seed inoculation ; Zea mays ; Acetylene reduction assay ; Yield response ; Associative N2 fixation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Inoculated and non-inoculated seedlings of Zea mays were grown in agricultural soils under aseptic and non-sterile conditions. Acetylene reduction activity and microbial counts were determined after 7 and 30 days of growth. Irrespective of the soil type Azotobacter spp. were commonly isolated under maize cultivation. Inoculation of agricultural soils with a suspension of A. chroococcum led to an increase in Azotobacter numbers, although this effect diminished with time. Nitrogenase activity was detected on maize roots and increased in response to the inoculation with A. chroococcum, showing that this associative growth could be of primary importance for the plant. The results of assays for acetylene reduction activity indicated that the nitrogenase activity was associated only with the root systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00257669
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  • 3
    Electronic Resource
    Electronic Resource
    Grain yield response of Zea mays (hybrid AE 703) to Azotobacter chroococcum H23 (1988)
    Springer
    Biology and fertility of soils 6 (1988), S. 352-353 
    Details
    ISSN: 1432-0789
    Keywords: A. chroococcum ; Zea mays ; Yield response ; Fertilizer N ; Inoculation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Field experiments were conducted during 1985 and 1986 to examine the effect of Azotobacter chroococcum on the grain yield of maize. Application of 40 kg N ha−1 plus A. chroococcum caused a significant increase in maize yield. Azotobacter inoculation was more efficient at lower doses (40 kg N ha−1) than at high doses (80 kg N ha−1) of urea.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00261026
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  • 4
    Electronic Resource
    Electronic Resource
    Catabolite inactivation of isocitrate lyase from Saccharomyces cerevisiae (1987)
    Springer
    Archives of microbiology 147 (1987), S. 231-234 
    Details
    ISSN: 1432-072X
    Keywords: Isocitrate lyase ; Catabolite inactivation ; Cyclic AMP
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A reversible carbon catabolite inactivation step is described for isocitrate lyase from Saccharomyces cerevisiae. This reversible inactivation step of isocitrate lyase is similar to that described for fructose 1,6-bisphosphatase. Addition of 2,4-dinitrophenol, nystatin or glucose to cultures, grown in ethanol as carbon source, caused a rapid loss of the isocitrate lyase and fructose 1,6-bisphosphatase activities at pH 5.5 but not at pH 7.5. These results suggest that intracellular acidification and thus a cAMP increase is involved in the catabolite inactivation mechanism of both enzymes. From results obtained by addition of glucose to yeast cultures at pH 7.5 it was concluded that others factors than cAMP can play a role in the catabolite inactivation mechanism of both enzymes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00463480
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  • 5
    Electronic Resource
    Electronic Resource
    Adenine nucleotide contents and energy charge of Azotobacter vinelandii grown at low phosphate concentration (1987)
    Springer
    Archives of microbiology 147 (1987), S. 354-357 
    Details
    ISSN: 1432-072X
    Keywords: Azotobacter ; Low-phosphate medium-Adenine nucleotides ; Energy charge-Poly ; β-hydroxybutyrate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effect of a low phosphate concentration on intracellular adenine nucleotide content, oxygen consumption and poly-β-hydroxybutyrate deposition was investigated with N-free and NH 4 + batch cultures of Azotobacter vinelandii. When the microorganisms were cultured under low-phosphate concentrations the cells contained much larger amounts of poly-β-hydroxybutyrate, but displayed lower oxygen consumption activities and energy charge values than did control cells. Also, the ratio ATP to ADP was much higher in control cells and the intracellular levels of ATP were lower in low-phosphate cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00406132
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  • 6
    Electronic Resource
    Electronic Resource
    Flavodoxin from the nitrogen-fixing cyanobacterium Anabaena PCC 7119 (1988)
    Springer
    Archives of microbiology 150 (1988), S. 160-164 
    Details
    ISSN: 1432-072X
    Keywords: Anabaena ; Biochemical properties ; Flavodoxin ; Nitrogenase ; Photosystem-I electron transport ; Spectral characteristics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Flavodoxin has been isolated and purified from cultures of the cyanobacterium Anabaena cultivated in a low-iron medium. This flavoprotein has a molecular weight of 20,000 and contains 1 molecule of flavin mononucleotide per mol of protein. Various biochemical characteristics are reported including amino-acid composition, isoelectric point and the fluorescence properties of the apoprotein. The extinction coefficients and isosbestic points were determined for the oxidized and semiquinone forms of flavodoxin. The electron paramagnetic resonance spectrum of the semiquinone exhibited a spectral linewidth of 23 G, which is typical for a neutral flavoprotein semiquinone. Kinetic measurements give a rate constant of 9.6×107 (M-1 min-1) for the reduction of flavodoxin in the photosynthetic electron-transport chain by the photosystem I and 6.6×106 for the reaction in which flavodoxin is reduced by ferredoxin-NADP+ oxidoreductase. The Michaelis constant for electron donation to nitrogenase by reduced flavodoxin is 8.5 μM.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00425156
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  • 7
    Electronic Resource
    Electronic Resource
    Superoxide dismutase in strains of the genus Flavobacterium: isolation and characterization (1989)
    Springer
    Archives of microbiology 152 (1989), S. 407-410 
    Details
    ISSN: 1432-072X
    Keywords: Superoxide dismutase ; Flavobacterium genus ; Flavobacterium halmephilum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Two electrophoretically different forms of superoxide dismutase, one of them containing manganese-protein and the other iron-protein, were detected in eleven different strains of the genus Flavobacterium. The activities of the different strains were similar to those described for other bacteria. The two molecular forms of the enzyme differed clearly with regard to activity, electrophoretic behaviour, sensitivity to cyanide and peroxide, and NaCl requirement. Both molecular forms were isolated from Flavobacterium halmephilum. Molecular mass absorption spectra, metal content, optimum pH, heat-sensitivity and stability were described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00425182
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  • 8
    Electronic Resource
    Electronic Resource
    Growth and nitrogenase activity of Azotobacter vinelandii in the presence of several phenolic acids (1988)
    Springer
    Archives of microbiology 150 (1988), S. 113-116 
    Details
    ISSN: 1432-072X
    Keywords: Azotobacter vinelandii ; Phenolic acids ; Nitrogenase activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Growth and nitrogenase activity (acetylene reduction) of Azotobacter vinelandii in chemically defined N-free media were studied in the presence of p-hydroxybenzoic, vanillic, p-coumaric, and ferulic acids at concentrations from 0.01 to 1% (w/v). Growth and nitrogenase activity were only detected when the microorganism was cultured on p-hydroxybenzoic acid either as sole carbon source or mixed with other phenolic acids, suggesting that p-hydroxybenzoic acid could be utilized as a carbon source by A. vinelandii for growing under certain environmental conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00425149
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  • 9
    Electronic Resource
    Electronic Resource
    Subcellular localization and glycoprotein nature of the invertase from the fission yeast Schizosaccharomyces pombe (1985)
    Springer
    Archives of microbiology 142 (1985), S. 370-374 
    Details
    ISSN: 1432-072X
    Keywords: Schizosaccharomyces pombe ; Invertase (sucrase) ; Subcellular distribution of enzymes ; Glycoproteins ; Concanavalin A ; Bandeiraea simplicifolia lectin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The subcellular localization of the enzyme invertase in Schizosaccharomyces pombe cells, both repressed and derepressed for synthesis of the enzyme, was studied. Most of the invertase was found to be located outside the plasma membrane and only a small percentage was found to be associated to membranes. A substantial portion of the external enzyme remained firmly bound to cell-wall material. All of the invertase recovered in soluble form from cellular extracts reacted with concanavalin A and with the lectin from Bandeiraea simplicifolia seeds, indicating the presence in the enzyme of a carbohydrate moiety which probably contains terminal mannosyl (or structurally related) and galactosyl residues. The possibility of the presence of two different forms of invertase in S. pombe was considered. An intracellular, soluble form of invertase, devoid of carbohydrate, similar to the small invertase of the budding yeast Saccharomyces cerevisiae, was not found in S. pombe. However, the Michaelis constant for sucrose of the enzyme present in repressed cells was smaller than that of the invertase synthesized under derepressing conditions, although this difference could also be the result of a different pattern of glycosylation of the invertase synthesized under different growth conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00491906
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  • 10
    Electronic Resource
    Electronic Resource
    Differential sensitivities to glucose and galactose repression of gluconeogenic and respiratory enzymes from Saccharomyces cerevisiae (1985)
    Springer
    Archives of microbiology 143 (1985), S. 216-219 
    Details
    ISSN: 1432-072X
    Keywords: Isocitrate lyase ; Induction ; Catabolite repression ; Catabolite inactivation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The synthesis of isocitrate lyase was induced by the presence of ethanol in the chemostat reaching a specific activity of 200 mU·mg-1 at this induced state. In glucoselimited, derepressed cells, 20 mU·mg-1 were detected and under repressed conditions isocitrate lyase activity was not detected. The sensitivity of gluconeogenic enzymes: cytoplasmic malate dehydrogenase; fructose 1,6-bisphosphatase and isocitrate lyase as well as the mitochondrial enzymes NADH dehydrogenase and succinate cytochrome c oxidase to glucose and galactose repression were studied in chemostat cultures. Our results show that galactose was less effective as a repressor than glucose. Malate dehydrogenase was completely inactivated by glucose, whereas galactose only produced a 78% decrease of specific activity. Fructose 1,6-bisphosphatase and isocitrate lyase were completely inactivated by both sugars but at different rate. Glucose produced an 85% decrease of specific activity of the mitochondrial enzymes whereas galactose only decrease an 67%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00411238
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