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  • 1985-1989  (90)
  • 1935-1939  (2)
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Year
  • 11
    Electronic Resource
    Electronic Resource
    The Drosophila clock gene per affects intercellular junctional communication (1987)
    [s.l.] : Nature Publishing Group
    Nature 328 (1987), S. 686-691 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The per locus of Drosophila has been implicated in the control of behavioural rhythms. In fruitfly embryos and larvae per is expressed in salivary glands. Per mutations have striking effects on intercellular communication in salivary glands: gap junction channels are modulated so that their ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/328686a0
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  • 12
    Electronic Resource
    Electronic Resource
    Structure of a cobalt(III) complex with two opically active ligands (1987)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 43 (1987), S. 1487-1490 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270187091364
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  • 13
    Electronic Resource
    Electronic Resource
    Untersuchungen über die Geschlechtszellen der Amphibien (Anuren) (1936)
    Springer
    Cell & tissue research 24 (1936), S. 727-777 
    Details
    ISSN: 1432-0878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00401957
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  • 14
    Electronic Resource
    Electronic Resource
    The effective homogeneous behavior of heterogeneous porous media (1989)
    Springer
    Transport in porous media 4 (1989), S. 213-238 
    Details
    ISSN: 1573-1634
    Keywords: Multiple scales ; double porosity ; heterogeneous porous media ; multiphase flow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract The macroscopic equations that govern the processes of one- and two-phase flow through heterogeneous porous media are derived by using the method of multiple scales. The resulting equations are mathematically similar to the point equations, with the fundamental difference that the local permeabilities are replaced by effective parameters. The method allows the determination of these parameters from a knowledge of the geometrical structure of the medium and its heterogeneities. The technique is applied to determine the effective parameters for one- and two-phase flows through heterogeneous porous media made up of two homogeneous porous media.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00138037
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  • 15
    Electronic Resource
    Electronic Resource
    On the scalar-tetradic theories of gravitation: Cosmology and gravitational radiation (1985)
    Springer
    General relativity and gravitation 17 (1985), S. 579-593 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The so-called scalar-tetradic theoriesA andB generalize Møller's theory of gravitation. In this work, some results previously obtained in Møller's theory are extended to the theoriesA andB. When the parametersW andλ *. of the theoryA are not too small (or large), the losses of energy and angular momentum of a nongravitationally bound system are proved to be the same as in general relativity. The basic equations of cosmology are derived and some topics are treated. In particular, any density of energyρ 0 (10−29 g cm−3 ≳ρ 0 ≳ 10−31 g cm−3) appears to be compatible with the observational values ofH 0 (Hubble constant) andqo (deceleration parameter) in the theory A; thus, no intergalactic energy assumption is necessary.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00763051
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  • 16
    Electronic Resource
    Electronic Resource
    On Møller's tetrad theory of gravitation. Gravitational radiation (1985)
    Springer
    General relativity and gravitation 17 (1985), S. 39-53 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In the background of Møller's theory, two energy-momentum complexest andP, are defined. From them, the losses of energy and angular momentum of a nongravitationally bound system due to the radiation of gravitational waves are evaluated. To solve the field equations some approximation procedures are used. The post-Newtonian limit is studied. When the modulus of the coupling constant of the theory is smaller than 103 and some reasonable conditions are assumed, the results here obtained appear to be identical to those of general relativity. The work performed here would be basic when dealing with some important questions in generalizing Møller's theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00760105
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  • 17
    Electronic Resource
    Electronic Resource
    Static spherically symmetric fields in the scalar-tetradic theoryA (1986)
    Springer
    General relativity and gravitation 18 (1986), S. 479-496 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The scalar-tetradic TheoryA has been recently formulated. In this paper it is proved that, for a suitable tetrad field and any given value of the coupling constantW of the theory, there is a unique static spherically symmetric solution of the field equations describing the outer field of a standard perfect fluid sphere (such as the sun); the explicit form of this solution in terms of the radial isotropic coordinater appears to be different in the three cases: (1)W 〈0 orW 〉 2, (2) 0 〈W 〈 2, and (3)W =2. On account of the Birkhoff theorem the quoted solution appears to have considerable physical interest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00770464
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  • 18
    Electronic Resource
    Electronic Resource
    A nonsingular cosmology in the scalar tetradic theory A (1987)
    Springer
    General relativity and gravitation 19 (1987), S. 581-599 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The basic cosmological equations of the scalar-tetradic theory A were recently obtained. Here, the general matter-dominated solution of these equations (which involve the arbitrary dimensionless constantsD andW) is derived and studied in the caseD=0. One of the cosmological models obtained in this way appears to be free of singularities (W〈0) whereas another singular model (W〉8/3) becomes compatible with small energy densities (10−31 gcm−3). More study about the caseD#0, as well as about other equations of state and other scalar-tetradic theories, could lead to new interesting results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00762555
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  • 19
    Electronic Resource
    Electronic Resource
    Effect of photoperiod on testicular function in blinded and non-blinded marbled newts, Triturus marmoratus (caudata, salamandridae) (1989)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 200 (1989), S. 151-162 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Adult male marbled newts (Triturus marmoratus) were collected at the beginning of the spermatogenetic period and exposed to different photoperiods (natural photoperiod with progressively increasing daylengths, total darkness, 8L:16D, 12L:12D, 16L:8D, and continuous light) for 3 months at 20°C. To evaluate the effect of photoperiodic input via pineal gland photoreceptors, two additional groups of newts were blinded by a non-aggressive method (an elastic rubber cap was adjusted to the head to cover the eyes but not the pineal photoreceptors). These animals were exposed either to the natural photoperiod or to 12 hr of light per day. Quantitative histologic studies on testicular development and germ-cell volume revealed no significant differences between non-blinded and blinded animals. Testicular size and germ-cell development increased in the following order: total darkness, constant light, 8L:12D, natural photoperiod, 12L:12D, and 16L:8D. These results suggest that (1) long photoperiods enhance testicular development, whereas short photoperiods or an environment of continuous light have the opposite effects and (2) the effect of photoperiods on testicular function in newts is independent of the ocular photoreceptors.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1052000205
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  • 20
    Electronic Resource
    Electronic Resource
    Methods of preparation and properties of nickel powder from powdered nickel oxide of Cuban origin I. Kinetic parameters of the reduction of nickel from its oxide (1989)
    Springer
    Powder metallurgy and metal ceramics 28 (1989), S. 1-3 
    Details
    ISSN: 1573-9066
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01171794
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