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  • Springer  (56)
  • 1975-1979  (56)
Collection
Keywords
Publisher
Years
Year
  • 11
    Electronic Resource
    Electronic Resource
    Isothermic variation of the specific growth rate of Saccharomyces cerevisiae in batch culture (1977)
    Springer
    Archives of microbiology 113 (1977), S. 303-307 
    Details
    ISSN: 1432-072X
    Keywords: Saccharomyces cerevisiae ; Specific growth rate ; Growth control ; Glucose transfer ; Glucose-6-phosphate ; Maintenance requirements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The specific growth rate (μ) of a respiration-deficient mutant of Saccharomyces cerevisiae growing under defined experimental conditions in batch culture (mineral medium plus glucose and vitamins at 25°C) varied from experiment to experiment over a wide range (0.10–0.24 h-1) and showed a normal distribution. Neither the age of the culture, the history of the inoculum, nor experimental error accounted wholy for the variability of μ. The variation was positively correlated with the specific rate of glucose transfer and negatively with the specific rate of production of non-fermentative CO2. The yield decreased with μ implying higher maintenance requirements in batch culture (4.7 mmoles g-1 h-1) than in continuous culture (0.8 mmoles g-1 h-1). It was concluded that the strain is capable of establishing any one of several steady states of growth under the same experimental conditions, each steady state displaying some buildin inertia with respect to change. The variations of the specific rates of glucose transfer and non-fermentative CO2 production, and of the yield appeared to be consequences rather than causes of the variation of μ. The ultimate causes of the variation of μ remained unidentified.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00492039
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  • 12
    Electronic Resource
    Electronic Resource
    Investigations on the cold-work peak of hydrogen in iron by means of the magnetic after-effect (1975)
    Springer
    Applied physics 7 (1975), S. 107-112 
    Details
    ISSN: 1432-0630
    Keywords: Magnetic after-effect ; Interaction point defects ; Dislocations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The magnetic after-effect of hydrogen-charged iron was investigated in the temperature range between 77 and 200 K. The hydrogen cold-work peak, known so far only from internal friction measurements, has been observed at about 130 K together with a less pronounced relaxation peak at 80 K. The activation energy of ∼0.29 eV, determined for the cold-work peak, is explained by a thermally activated motion of dislocations, the cores of which are closely decorated by a condensed atmosphere of hydrogen atoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00884219
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  • 13
    Electronic Resource
    Electronic Resource
    Close relation between hypothalamic and cardiac norepinephrine during stress and its role in acute myocardial infarction disrhythmias (1978)
    Springer
    Cellular and molecular life sciences 34 (1978), S. 1611-1613 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The decrease of the norepinephrine levels in hypothalamus and heart caused by stress is prevented by pargyline and imipramine. Such a decrease in spleen and adrenals is not affected. Chlorpromazine and lithium only prevent the norepinephrine decrease in the spleen. The uptake of H3norepinephrine by isolated atria of guinea-pig increases during anoxia; the change to a normal oxygen situation decreases these norepinephrine levels by more than 50%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02034706
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  • 14
    Electronic Resource
    Electronic Resource
    Quantitative inheritance and barriers to crossability in Cicer arietinum L. (1979)
    Springer
    Theoretical and applied genetics 55 (1979), S. 5-16 
    Details
    ISSN: 1432-2242
    Keywords: Genetic barriers ; Cicer arietinum ; Diallel analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Three different diallel crosses were studied in Cicer arietinum; two of size 6×6, one within each of the two botanical groups ‘macrosperma’ and ‘microsperma’ of the cultivated subspecies, and one of 9×9 involving lines covering most of the morphological variation of chickpea. Barriers to crossability present neither a botanical nor a geographical pattern, being probably a direct consequence of interactions between genotypes. The genetic systems of twelve quantitative characters were analysed. Full dominance in a negative sense (small values dominant) is shown by leaflet length, width and shape index, rachis length, leaflet density on the rachis and pod length. Full dominance in a positive sense is shown by seeds per pod. Overdominance (in a positive sense) is evident for pods, seeds and yield per plant. Weak reciprocal differences were manifested by pod length, and pods, seeds and yield per plant. The system controlling number of leaflets per leaf is not clear. Dominance of ‘primitive’ over ‘selected’ characters seems to be the rule. As far as the environmental effects have permitted the analysis, no differences in genetic systems were observed between botanical groups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00282970
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  • 15
    Electronic Resource
    Electronic Resource
    Germination inhibitors in the pine seed coat (1978)
    Springer
    Planta 141 (1978), S. 141-144 
    Details
    ISSN: 1432-2048
    Keywords: Abscisic acid ; Dormancy (seeds) ; Germination (seeds) ; Inhibitors (seeds germination) ; Pinus ; Seed coat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Inhibitors from (Pinus pinea L.) seed coats were separated using paper chromatography, thin layer chromatography, and a Sephadex G-10 column. The inhibitory activity was resolved into several fractions. One of these behaved similarly to abscisic acid. It has exhibed the same properties as ABA in thin-layer chromatography, paper chromatography, and Sephadex G-10 chromatography and in UV absorption and fluorescence spectra. These germination inhibitors, present in the seed coats, are involved in the regulation of P. pinea seed germination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00387880
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  • 16
    Electronic Resource
    Electronic Resource
    Contrast ratio variation caused by radiation attenuation in pulse width measurement by two-photon absorption fluorescence (1979)
    Springer
    Optical and quantum electronics 11 (1979), S. 297-304 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract In the technique for measuring pulse width by two-photon absorption fluorescence, theoretical calculations indicate that one can hope to obtain a maximum contrast ratio of three between the point at which the two peaks overlap and the point at which there is no superposition. Nevertheless, this calculation has been carried out assuming that the pulse is not attenuated as it traverses the fluorescent medium. In this paper it will be shown that this attenuation gives rise to a decrease in the contrast ratio. As the fluorescence intensity is proportional to the absorption, an increase in the former will be to the detriment of the contrast ratio. We will attempt to give a criterion for the selection of experimental conditions which lead to maximum intensity without an appreciable decrease in the contrast ratio.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00619363
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  • 17
    Electronic Resource
    Electronic Resource
    Book review (1976)
    Springer
    Bulletin of mathematical biology 38 (1976), S. 209-217 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02471758
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  • 18
    Electronic Resource
    Electronic Resource
    Thermal decomposition of sulphate complexes of uranium(IV) hydrates (1979)
    Springer
    Journal of thermal analysis and calorimetry 17 (1979), S. 115-121 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Résumé On a étudié la décomposition thermique des hydrates de 5 sulfates neutres complexes et de 5 hydroxysulfates complexes de l'uranium(lV). Les hydrates n'ont pas fourni de composés correspondants anhydres stables. Après leur déshydratation, les complexes se décomposent suivant des réactions endothermiques qui font intervenir substitution progressive de l'anhydride sulfurique (libéré) par de l'oxygène, donnant des oxy-sulfates et d'autres composés oxy.
    Abstract: Zusammenfassung Die thermische Zersetzung der Hydrate von 5 neutralen Sulfatokomplexen und 5 Hydroxy-sulfatokomplexen des Uran(IV) wurde untersucht. Die Hydrate ergaben keine entsprechenden stabilen wasserfreien Verbindungen. Nach ihrer Dehydratisierung werden die Komplexe in endothermen Reaktionen durch fortschreitende Substituierung des (freigesetzten) Schwefeltrioxids durch Sauerstoff zersetzt, wobei Oxysulfate und andere Oxyverbindungen entstehen.
    Notes: Abstract A study was made of the thermal decompositions of the hydrates of 5 neutral sulphate complexes and 5 hydroxy-sulphate complexes of uranium(IV). The hydrates did not yield corresponding stable anhydrous compounds. After dehydration, the complexes decomposed in endothermic reactions involving progressive substitution of sulphur trioxide (that is liberated) by oxygen, giving oxy-sulphates and other compunds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02156605
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  • 19
    Electronic Resource
    Electronic Resource
    Kernels and ranges in the variational formalism (1978)
    Springer
    Letters in mathematical physics 2 (1978), S. 385-390 
    Details
    ISSN: 1573-0530
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract We introduce an extension of the concept of variational derivative which allows us to derive an integral identity in the variational formalism. It is applied to characterize the kernel and range of the variational derivative and the divergence operator.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00400164
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  • 20
    Electronic Resource
    Electronic Resource
    On the Noether map (1979)
    Springer
    Letters in mathematical physics 3 (1979), S. 419-424 
    Details
    ISSN: 1573-0530
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract For a wide class of lagrangian systems we show rigorously that the conventional formulation of Noether's theorem provides a bijective map from the set of equivalence classes of Noether's symmetries onto the set of equivalence classes of conserved currents. We further discuss if Noether's theorem is generalized in a significant way by several formulations proposed in this decade.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00397216
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