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  • Articles  (423)
  • Springer  (423)
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  • Articles  (423)
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  • 1
    Electronic Resource
    Electronic Resource
    Acyl fluorides as reactive mimics of aldehyde pheromones: hyperactivation and aphrodisiac inHeliothis virescens (1986)
    Springer
    Cellular and molecular life sciences 42 (1986), S. 964-966 
    Details
    ISSN: 1420-9071
    Keywords: Acid fluoride ; aldehyde ; mating disruption ; pheromone analogs ; Heliothis ; Lepidoptera ; fluorination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Substitution of fluorine for the aldehydic hydrogen provides behaviorally active, chemically reactive pheromone mimics. In male moths of the tobacco budwormHeliothis virescens, Z9–14:Acf and Z11–16:Acf cause hyperactivity and irreversible extension of the genitalia in over 80% of treated moths. In addition, a combination of the two components leads to 10–50% of the pairs involving one treated partner becoming locked in copula.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01941782
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  • 2
    Electronic Resource
    Electronic Resource
    Embryonic expression of the engrailed homologue of Rhynchosciara americana (1996)
    Springer
    Development genes and evolution 205 (1996), S. 432-436 
    Details
    ISSN: 1432-041X
    Keywords: engrailed ; Embryonic development ; Gene expression ; Segmentation ; Rhynchosciara americana
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The segment polarity gene engrailed is involved in the determination of segment posterior identity in Drosophila. engrailed has been largely used for comparative developmental studies due to its evolutionary conservation from nematodes to humans. By in situ hybridization of an engrailed cDNA probe from Drosophila to polytene chromosomes of fourth instar larvae of Rhynchosciara americana we have shown that engrailed-like sequences must be localized in band 6 of chromosome A in this species. The pattern of engrailed protein expression during R. americana embryo development is diffuse at first evolving into a nuclear striped pattern after quite a length of time. In addition, our results suggest a possible developmentally regulated molecular modification of engrailed protein in R. americana embryos.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00377223
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  • 3
    Electronic Resource
    Electronic Resource
    Mineral water exploration and exploitation at the Portuguese Hercynian Massif (1996)
    Springer
    Environmental geology 27 (1996), S. 252-258 
    Details
    ISSN: 1432-0495
    Keywords: Spas ; Mineral waters ; Hercynian Massif ; Portugal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The thermal baths and bottled water industry are highly related to the hydrogeology of hard rocks in Portugal. In the last 15 years, almost all classical dug wells or simple spring arrangements were replaced by drilled wells. The completion of these new wells was normally preceded by geological, geophysical, and hydrogeological surveys as well as by exploration and observation wells. A step-by-step approach resulted in a positive well location in most sites. Some small-scale, low-enthalpy geothermal projects are in operation in some locations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00770439
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  • 4
    Electronic Resource
    Electronic Resource
    Non-vacuum cosmological solutions of 5D variable mass theory of gravity (1994)
    Springer
    Astrophysics and space science 215 (1994), S. 53-58 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A class of non-vacuum expanding cosmological solutions of Wesson's 5D theory of gravity with variable rest mass is derived. The models are spatially homogeneous and isotropic and the source of gravitation is a pressureless fluid (dust) plus a cosmological constant term. The general and unified solution is found for the equations and some properties of different limiting cases are studied. Particularly, it is shown that for null cosmological constant the predicted age of the universe is smaller than the ones of the 4D FRW models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00627459
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  • 5
    Electronic Resource
    Electronic Resource
    Ages of the universe for FRW-type models in wesson's 5D variable mass theory of gravity (1994)
    Springer
    Astrophysics and space science 219 (1994), S. 29-34 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The age of the universe is computed for spatially homogeneous and isotropic cosmological models of the relativistic Wesson's 5D variable mass theory of gravity. It is shown that if the pressure in the mass dimension is negligible, ages old enough to agree with the observations can only be obtained if the cosmological constant is different from zero. In addition, unlike the standard FRW models in Einstein's 4D theory, the age value itself is not affected by the nature of the matter content (matter and radiation dominated models give the same age).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00657857
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  • 6
    Electronic Resource
    Electronic Resource
    The diffusion model of cosmic-ray propagation (1979)
    Springer
    Astrophysics and space science 61 (1979), S. 3-17 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We show that the observational data on galactic synchrotron radiation can be explained if there is a break in the electron spectrum at about 2 GeV. We also show that one can explain the occurrence of that break by carefully considering the time evolution of the high-energy electron spectrum in supernova remnants, taking into account synchrotron losses, adiabatic expansion and diffusive losses from the remnant. The model considered is also in agreement with the observed radio spectrum of Cas A and the decay rate of its flux density.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00645788
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  • 7
    Electronic Resource
    Electronic Resource
    The diffusion model of cosmic-ray propagation (1979)
    Springer
    Astrophysics and space science 61 (1979), S. 45-64 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The diffusion equation for the electron component of cosmic rays is solved and the solution obtained is used to evaluate the electron spectrum, its spatial distribution, and the distribution of the galactic synchrotron radiation. We find reasonable agreement between theory and observational data for the same values of the parameters as found in Part II.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00645790
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  • 8
    Electronic Resource
    Electronic Resource
    The diffusion model of cosmic-ray propagation (1979)
    Springer
    Astrophysics and space science 61 (1979), S. 19-44 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We set up diffusion equations for the nuclear component of cosmic rays and solve these to find the ratio of light to medium nuclei in the cosmic rays as well as the gamma-ray distribution in our Galaxy. From a comparison of our calculated quantities with observational data we determine the values of various parameters appearing in the model. We find that best agreement between theory and observations is obtained if the cosmic-ray confinement region consists of a narrow disk of total height 160 pc and radius 16 kpc, where the cosmic-ray sources are located, and an extensive halo of height 20 kpc. The diffusion coefficient near the Sun must be between 1026 and 1027 cm2 s−1 while it equals 1028 to 1029 cm2 s−1 in the halo. Finally, we find that the diffusion coefficient in the Galaxy must depend on the gas density as a power law with an index of the order of −1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00645789
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  • 9
    Electronic Resource
    Electronic Resource
    Unified description of the early universe (1996)
    Springer
    International journal of theoretical physics 35 (1996), S. 2019-2028 
    Details
    ISSN: 1572-9575
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A homogeneous and isotropic cosmological model of the universe is studied in which the parameter gamma of the “gamma-law” equation of statep=(γ−1)ρ varies continuously with cosmological time. A unified description of the early evolution of the universe is given in which an inflationary period is followed by a radiation dominated phase. Comparing the dynamics of the model with those models endowed with matter creation or vacuum energy decay, allows us to establish the time dependence of the creation rate and of the cosmological constant in terms of the varying γ index.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02302426
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  • 10
    Electronic Resource
    Electronic Resource
    Direct determination of two-pion correlations for pp→ 2π+2π− annihilation at rest (1998)
    Springer
    The European physical journal 1 (1998), S. 139-148 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We study ππ correlations in the exclusive reaction pp → 2π+2π− at rest measured by the CPLEAR experiment. Avoiding the introduction of an arbitrary reference sample, we analyse differential distributions for equal charge pion pairs removing the phase-space factor event by event. A peak at small relative momenta is most pronounced for large total momentum of the pair. The physical implications of bosonic symmetrization for the properties of the pion source, in particular its radius, are briefly discussed. The two extremes considered are the chaotic Hanbury-Brown-Twiss mechanism and the coherent Skyrmion model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01245804
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