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  • Springer  (68)
  • 1980-1984  (68)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Leydig cell andΔ 5-3β-hydroxysteroid dehydrogenase activity in the testis of toad (Bufo melanostictus) following cold exposuredehydrogenase activity in the testis of toad (Bufo melanostictus) following cold exposure (1982)
    Springer
    Cellular and molecular life sciences 38 (1982), S. 692-693 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Leydig cell nuclear area andΔ 5-3β-hydroxysteroid dehydrogenase activity were increased in the testis ofBufo melanostictus 2 days after a single short-term cold exposure. Both parameters returned to normal values 4 days later.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01964100
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  • 2
    Electronic Resource
    Electronic Resource
    Frequency breakdown in semiconductors (1980)
    Springer
    Applied physics 22 (1980), S. 95-99 
    Details
    ISSN: 1432-0630
    Keywords: 77.20 ; 79.20 ; 85.30
    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 effect of the frequency of the applied voltage on the breakdown of semiconductors is investigated. Unlike earlier observations, our experiment yields, in some cases, a breakdown voltage versus frequency curve which is similar in nature to the high-frequency breakdown characteristics in gas devices wherein the breakdown voltage shows a minimum at a certain frequency. A possible theoretical explanation for the above behaviour of semiconductor devices based on dielectric heating is given, which is in fair agreement with the observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00897939
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  • 3
    Electronic Resource
    Electronic Resource
    Energy and nuclear charge dependence of abundance enhancements of solar cosmic ray heavy ions in three large solar events (1983)
    Springer
    Solar physics 89 (1983), S. 163-180 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The differential flux and energy spectra of solar cosmic ray heavy ions of He, C, O, Ne, Mg, Si, and Fe were determined in the energy interval E = 3–30 MeV amu-1 for two large solar events of January 24, 1971 and September 1, 1971 in rocket flights made from Ft. Churchill. From these data the relative abundances and the abundance enhancement factors, ξ, relative to photospheric abundances were obtained for these elements. Similar results were obtained for a third event on August 4, 1972 from the available published data. Characteristic features of ξ vs nuclear charge dependences were deduced for five energy intervals. The energy dependence of ξ for He shows a moderate change by a factor of about 3, whereas for Fe, ξ shows a very dramatic decrease by a factor of 10–20 with increasing energy. It is inferred that these abundance enhancements of solar cosmic ray heavy ions at low energies seem to be related to their ionization states (Z *) and hence studies of Z * can give information on the important parameters such as temperature and density in the accelerating region in the Sun.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00211960
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  • 4
    Electronic Resource
    Electronic Resource
    Studies on some biochemical aspects in the toad after 48 hours of exposure to simulated high altitude (1983)
    Springer
    International journal of biometeorology 27 (1983), S. 133-141 
    Details
    ISSN: 1432-1254
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Abstract Blood glucose, tissue carbohydrate, total plasma and tissue protein and plasma electrolyte concentrations were estimated in male toads, exposed to simulated high altitude of 12,000, 18,000 and 24,000 feet respectively for 48 hours of continuous exposure in a decompression chamber. Blood glucose and muscle carbohydrate were decreased significantly in animals exposed to 18,000 and 24,000 feet altitude, without having any change in the liver carbohydrate. Muscle carbohydrate was also decreased in 12,000 feet altitude exposed animals. Plasma protein content was increased significantly in 18,000 and 24,000 feet altitude exposed animals, whereas no such change was noted in tissue protein content. A slight increase of plasma sodium concentration was found in animals exposed to 24,000 feet, and a decrease of potassium concentration was also noted in 18,000 and 24,000 feet exposed animals. Magnesium concentration of the plasma was increased in 18,000 and 24,000 feet exposed animals. This animal had also shown an eosinopenia, lymphopenia and neutrophilia when exposed at 24,000 feet high altitude.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02185744
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of continuous light on the blood and urinary sugar levels in alloxan diabetic rats (1981)
    Springer
    Cellular and molecular life sciences 37 (1981), S. 153-154 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Continuous light decreases the rise in blood glucose and the excretion of urinary glucose, along with increased urine volume, in alloxan diabetic rats.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01963204
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  • 6
    Electronic Resource
    Electronic Resource
    Further studies on the sensitivity of plant pathogenic microorganisms towards some naturally occurring chalcones and flavanones (1981)
    Springer
    Cellular and molecular life sciences 37 (1981), S. 397-398 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The antifungal and antibacterial activities of some quinochalcones, chalcones and flavanones isolated fromDidymocarpus pedicellata have been assayed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01959884
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  • 7
    Electronic Resource
    Electronic Resource
    Prevention of estrogenic inhibition of adrenal 686-1686-1686-1686-2686-2686-2in rats (1981)
    Springer
    Cellular and molecular life sciences 37 (1981), S. 686-687 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The urinary proteinα 2u stimulates adrenalΔ 5-3β dehydrogenase activity and prevents adrenal enlargement in estrogen-treated adult male rats.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01967922
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  • 8
    Electronic Resource
    Electronic Resource
    Magnetic moment of relativistic quark gas in intense magnetic field (1980)
    Springer
    The European physical journal 5 (1980), S. 195-199 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Magnetic properties of a system of noninteracting relativistic quark gas in presence of an external intense magnetic field has been calculated assuming that quarks obey parastatistics of order three. It is found, although the magnetization is greater for quark gas than that for normal hadronic system, it is unlikely that the spontaneous magnetization will take place in a quark star.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01421775
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  • 9
    Electronic Resource
    Electronic Resource
    A comparative study of poiseuille flow of a polar fluid under various boundary conditions with applications to blood flow (1984)
    Springer
    Rheologica acta 23 (1984), S. 435-445 
    Details
    ISSN: 1435-1528
    Keywords: Polar fluid ; Poiseuille flow ; effective viscosity ; slip ; blood flow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract In this paper, Poiseuille flow of a polar fluid (model of a red blood cell suspension) under various boundary conditions at the wall, viz., slip or no-slip in the axial velocity and couple stresses zero or non-zero at the boundary, is considered from the point of view of its applications to blood flow. Analytic expressions for axial and rotational velocities, flow rate, effective viscosity and stresses are obtained. The magnitudes of the length ratioL and the coupling number N are determined in accordance with concentration and tube radius (in the existing literature, values ofL andN are chosen arbitrarily). Velocity profiles (both axial and rotational) and the variation of the effective viscosity with concentration, tube radius and for various values of the boundary condition parameters are shown graphically. The analytic results obtained are compared with experimental results (for blood flow). It is found that they are in a reasonably good agreement. The effective viscosity exhibits the Inverse Fahraeus-Lindquist Effect in all the cases (including the slip or no-slip in the velocity fields). A method is given for determining the non-zero couple stress boundary condition for a given concentration. Applications of this theory to blood flow are briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01329196
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  • 10
    Electronic Resource
    Electronic Resource
    The mechanical and optical properties of oriented fibres of semicrystalline polymers (1984)
    Springer
    Colloid & polymer science 262 (1984), S. 623-626 
    Details
    ISSN: 1435-1536
    Keywords: Orientation of polymer chains ; birefringence ; mechanical properties ; semicrystalline polymers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The mechanical properties of semicrystalline polymers are very much dependent on the molecular orientation. The orientation function to deal with the elastic moduli data of Hadley et al. (1969) are treated under new aspects. To determine the nature of orientation function from empirical data a relation of the form Sinθ=f (n) Sinθ′ is assumed to describe the change in the orientation angle of a unit from θ′ to θ for the draw ration. Birefringence experimental data are used to find the orientation functionf (n) which is then used to calculate elastic properties. The agreement of the experimental values ofE 0 andE 90 over the entire draw ratio range is found to be satisfactory for Nylon, low density polyethylene and polyethylene terephthalate. This furnishes strong empirical evidence for the validity of the orientational model for the above substances.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01452453
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