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  • 1975-1979  (9)
  • 1
    Electronic Resource
    Electronic Resource
    Improved antitumor effects in 3'-branched homologs of 2'-deoxythioguanine. Synthesis and evaluation of thioguanine nucleosides of 2,3-dideoxy-3-(hydroxymethyl)-D-erythro-pentofuranose (1979)
    s.l. : American Chemical Society
    Journal of medicinal chemistry 22 (1979), S. 518-525 
    Details
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jm00191a012
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Design of potent and specific inhibitors of carboxypeptidases A and B (1979)
    s.l. : American Chemical Society
    Biochemistry 18 (1979), S. 1427-1430 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00575a006
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    One-step, high yield conversion of penicillin sulfoxides to deacetoxycephalosporins (1975)
    s.l. : American Chemical Society
    The @journal of organic chemistry 40 (1975), S. 1346-1347 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00897a037
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Transformation of the perturbation equations for the analysis of magnetohydrodynamic couette flow stability (1976)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 27 (1976), S. 483-485 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Zusammenfassung Das Eigenwertproblem der MHD Stabilitätsanalyse für eine nichtdissipative Couette-Strömung zwischen koaxialen rotierenden Zylindern in Anwesenheit eines axialen Magnetfeldes wird in ein Eigenwertproblem für die modifizierte Mathieu-Gleichung mit komplexem Parameter und komplexer Variablen transformiert.
    Notes: Summary The eigenvalue problem of the MHD stability analysis for nondissipative Couette flow between coaxially rotating cylinders in the presence of a uniform axial magnetic field, is transformed to one for the modified Mathieu equation with complex parameter and variable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01594904
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Cold tolerance of long-distance runners and swimmers in Hawaii (1977)
    Springer
    International journal of biometeorology 21 (1977), S. 51-63 
    Details
    ISSN: 1432-1254
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Abstract The purpose of this study was to measure thermal and metabolic responses of six marathon runners and six long-distance ocean swimmers during a standard cold tolerance test, and to compare the results. The two groups of lean endurance athletes lived in Hawaii and were matched on the basis of age, height, weight, and skinfold thickness. Maximal oxygen uptake, however, was significantly higher in the runners (66.5 versus 58.8 ml/(kg·min) for the swimmers). There were no significant differences in maximal tissue insulation or the derived nonfat insulation, although the runners tended to have higher values. Our findings suggest a possible hypothermic insulative adaptation in the runners and, therefore, indirectly support a recent hypothesis that marathon training may potentiate cross-adaptation to cold. Reasons for a relatively high nonfat insulation in the runners (0.098 (°C.m2)/W) are unknown, but seem related to a vascular mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01552966
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  • 6
    Electronic Resource
    Electronic Resource
    The strength of LTI carbon dental implants (1977)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 11 (1977), S. 435-445 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: In vitro mechanical tests have been performed on a variety of LTI pyrolytic carbon blade-type dental implants, and the test results have been analyzed using an analytical model. Tensile stresses at fracture were calculated to be about 5 × 104 psi and 8 × 103 psi in the LTI carbon coating and the graphite substrate, respectively. These values are close to their respective fracture strengths. The fracture loads predicted by the model are in good agreement with data obtained from the mechanical tests and are higher than forces expected in mastication.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820110310
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  • 7
    Electronic Resource
    Electronic Resource
    The elongation and time dependence of the crystallinity of low-density polyethylene (1975)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 13 (1975), S. 1945-1957 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: It has been presumed in studies of the orientation of low-density polyethylene and its time dependence that the degree of crystallinity remained constant with elongation and did not vary with time following elongation. This paper represents a test of this hypothesis by several methods. The change in crystallinity accompanying stretching has been followed by a modification of an x-ray method for uniaxial orientation proposed by Ruland in which diffraction peaks are resolved into crystalline and amorphous components and their respective areas are determined by two-dimensional integration over both the Bragg angle and the azimuthal angle of diffraction. The weight-fraction crystallinity is then determined from the ratio of the weighted crystalline area to the total area. There appears to be no significant variation in crystallinity up to 50% sample elongation for both slowly and rapidly stretched samples at room temperature. The dynamic crystallinity change accompanying small amplitude vibration has also been determined by the dynamic x-ray diffraction technique and found to be negligible over a wide range of frequency. The degree of crystallinity has also been evaluated from the absolute infrared absorbance of crystallinity-sensitive bands and has also been found to be independent of elongation at room temperature up to 80% elongation. Changes have also been observed by this method during relaxation at constant length following rapid extension and have also been found to be negligible. These results also indicate negligible changes in rotational isomer population. Consequently, we conclude that changes observed during relaxation and vibration arise from orientational changes rather than changes in the degree of crystallinity.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1975.180131009
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of internal field on the birefringence of polyethylene crystals and on the anisotropy of polymer chains. I. Birefringence effects (1975)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 13 (1975), S. 1447-1459 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Values of the anisotropy of polarizability of methylene groups deduced from the refractive indexes of n-paraffin crystals differ appreciably from those obtained from gas- or liquid-phase measurements. The differences is attributed to the erroneous application of the Lorenz - Lorentz internal field to the anisotropic n-paraffin crystal. A more detailed calculation of the internal field is carried out by detailed summation of the dipolar field over an idealized n-paraffin crystal in which the molecular chains are replaced by anisotropic rods. With reasonable values of parameters and assumed crystal shape, the discrepancy in polarizability anisotropy is resolved.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1975.180130714
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  • 9
    Electronic Resource
    Electronic Resource
    Viscoelastic properties of entangled polymers. II. The interchain-intrachain entanglement model (1977)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 1869-1883 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Our earlier model of entangled chain dynamics represented the elastic effects at entanglement points as a coupling with the surrounding medium, which was propagated weakly to every other entanglement site on the parent chain. In this way, a great variety of linear viscoelastic phenomena could be successfully predicted, with the only significant deficiency being a quantitative failure in curve fitting the local minimum in dynamic loss modulus G″(ω). Here we introduce the “intrachain entanglement,” or the “internal entanglement,” in which the parent chain entangles directly with itself. Elastic forces between pairs of internal entanglements are assumed to be stronger than those with the medium (“external entanglement”). Predictions of the new model are compared with rheological data on monodisperse polystyrene. Good agreement is obtained between theory and experiment, including G″(ω).
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1977.180151101
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