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  • 1
    Electronic Resource
    Electronic Resource
    Use of a Neonatal Murine Retrovirus Model To Evaluate the Long-Term Efficacy and Toxicity of Antiviral Agents (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 616 (1990), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1990.tb17844.x
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  • 2
    Electronic Resource
    Electronic Resource
    A new type of spin ordering in a random magnet with competing anisotropies : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6084-6086 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The result of an elastic neutron-scattering study of the phase transition in the random magnet with competing anisotropies Fe0.75Co0.25Br2 is reported. It was found that the ordering of the spin component parallel to the crystalline c axis at the transition from the paramagnetic to antiferromagnetic phase induces an ordering of the spin component perpendicular to it. Thus, there is no boundary separating the higher-temperature antiferromagnetic and lower-temperature mixed-ordering phase. This type of spin ordering is interpreted as arising from a coupling between the orthogonal spin components.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353477
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  • 3
    Electronic Resource
    Electronic Resource
    Seismic Attenuation By Scattering: Theory and Numerical Results (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 114 (1993), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Estimates of seismic wave attenuation are strongly affected by scattering. Scattering is an important effect caused by interaction of seismic wavefields with inhomogeneities of hydrocarbon reservoirs, Earth's crust and mantle. In order to study the contribution of scattering to apparent attenuation we consider plane-wave propagation in acoustic 2-D and 3-D inhomogeneous media. Different attenuation estimates result depending on what wavefield function is being averaged during corresponding processing. By wave-theoretical analysis and high-order finite difference modelling in two dimensions we show that scattering attenuation estimates derived from the mean of amplitude spectra and from the mean logarithm of amplitude spectra depend on travel distance. For not too long travel distances, where the coherent part of the wavefield dominates, we give an analytical description of these estimates. In 2-D and 3-D the relations are established between the autocorrelation functions of velocity fluctuations of a random medium and the autocorrelation functions of amplitude and phase fluctuations on a receiver line perpendicular to the general propagation direction of an originally plane wave. For long distances, where the wavefield fluctuates strongly, we show that both mean logarithm of amplitude and logarithm of mean amplitude tend to constants. They differ approximately by a factor two in both scattering regimes. the scattering attenuation coefficient of the meanfield is not dependent on travel distance. We compared our theoretical results with numerical calculations and found excellent agreements. the concept presented clarifies the nature of seismic Q estimations in the presence of scattering and can help to yield statistical earth models from seismic data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1993.tb03925.x
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  • 4
    Electronic Resource
    Electronic Resource
    Elastic waves scattering and radiation by fractal inhomogeneity of a medium (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 110 (1992), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: I obtain the Born approximation for the scattered intensity I, the differential cross-sections σd, and the total scattering cross-sections σ of elastic wavefields scattered by a mass fractal, an object with a fractal surface and a fragment of a turbulent medium. The results for I and σd are valid for an arbitrary anisotropic random discrete or continuous inhomogeneity and they are in agreement with the well known results for discrete inclusions (Gubernatis, Domany & Krumhansl 1977b). For fractal inhomogeneities I show that: (1) for small angle scattering I∝ω4+ω(sin θ/2)n̈, where θ is a scattering angle and the constant n̈ depends linearly on the fractal dimension; (2) σ∝ω4+ω; (3) σ∝ω4+n̈ if n̈〉-2 and σ∝ω2 if n̈≤ -2; and (4) the Fourier transform of the correlation function of the wavefield Γ which is coherently radiated by white noise point sources distributed on fractal objects obeys [Γ] ∝ωσ. Applying the results for σd I show that the model of inhomogeneities with a fractal surface is in agreement with the fractal dimensions of some fault systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1992.tb02094.x
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  • 5
    Electronic Resource
    Electronic Resource
    An observational test for the existence of a planetary system orbiting PSR1257 + 12 (1992)
    [s.l.] : Nature Publishing Group
    Nature 355 (1992), S. 325-326 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] To each planet orbiting the pulsar there corresponds a mass function3 fj = (ra, sin i)3/(M + nij)2. Here M is the mass of the central neutron star, m, is the mass of the planet, with j = l for the inner planet and j = 2 for the outer planet, and i is the angle between the orbital ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/355325a0
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  • 6
    Electronic Resource
    Electronic Resource
    Congenital complete atrioventricular block in an infant with Miller-Dieker syndrome (1994)
    Springer
    Pediatric cardiology 15 (1994), S. 209-209 
    Details
    ISSN: 1432-1971
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00800679
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  • 7
    Electronic Resource
    Electronic Resource
    Two dimensional XY type magnetism in intercalated graphite: an elastic and inelastic neutron scattering study (1994)
    Springer
    The European physical journal 93 (1994), S. 277-297 
    Details
    ISSN: 1434-6036
    Keywords: 75.30.K ; 68.65 ; 25.40.F
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Stage-2 CoCl2-GIC approximates a two-dimensional easy-plane (XY) ferromagnet on a triangular lattice. It has been found in prior work to order in two steps, with the intermediate phase showing long-ranged ferromagnetic correlations within the intercalate plane, but no correlations between neighboring planes. We have probed the wave vector and temperature dependence of the static and dynamic spin correlations in detail, including measurements of the critical scattering, the quasielastic scattering from vortex diffusion and the spin wave excitations with and without an external magnetic field. Some of the predictions for a Kosterlitz-Thouless type transition are met in this compound, at least qualitatively, including an apparent jump in the spin stiffness at the critical point and the existence of a diffusive central peak in the scattering function possibly originating from vortex autocorrelations. However, there are some inconsistencies between our observations and recent analytical studies as well as Monte Carlo-molecular dynamics simulations of the vortex dynamics that prevent unambigous assignment of the upper critical temperature as a vortex-binding transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01312698
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  • 8
    Electronic Resource
    Electronic Resource
    Short-range order effects in amorphous polycondensates as studied by spin polarized diffuse neutron scattering and simulation (1994)
    Springer
    Colloid & polymer science 272 (1994), S. 1403-1419 
    Details
    ISSN: 1435-1536
    Keywords: Polycarbonate ; partial structure factors ; neutron scattering ; simulation
    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 Short-range order effects in amorphous polycondensates, including the technologically important bisphenol-A-polycarbonate, have been investigated by elastic diffuse neutron scattering with spin polarization analysis. Selectively deuterated samples of each polycondensate have been used in order to vary the scattering contrast and thereby emphasize different pair correlations. The technique of spin polarization analysis allowed a reliable separation of the coherent scattering and an intensity calibration on the basis of the incoherent scattering as an internal standard. Thus, (dσ/dΩ)coh has been measured directly by this method. The experimental results are compared to calculated cross-sections from computer-generated structures. Simulations have been performed with the “amorphous cell” method which models the static structure of the amorphous polymer in full chemical detail on the basis of a “random coil” conformation. The results of the simulations yield a fertily ground for the discussion of the measured cross-sections, though a direct comparison with the experiment is not always satisfactory. The observed discrepancies indicate a still insufficient structural relaxation of the simulated structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00654171
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  • 9
    Electronic Resource
    Electronic Resource
    Risk of agranulocytosis and aplastic anemia in relation to history of infectious mononucleosis: A report from the international agranulocytosis and aplastic anemia study (1993)
    Springer
    Annals of hematology 67 (1993), S. 187-190 
    Details
    ISSN: 1432-0584
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The general objective of this study was to evaluate the risks of agranulocytosis and aplastic anemia in relation to drug use. Other potential risk factors, including history of infectious mononucleosis, were also evaluated. In an international populationbased case-control study, cases of agranulocytosis and aplastic anemia and controls, who were patients with selected diagnoses, were identified from the same hospitals. Information on drug use was obtained in a structured interview. Limited information on environmental exposures and on selected items of medical history, including infectious mononucleosis, was also recorded. The possible effects of these factors on the risk of the two blood dyscrasias were evaluated. Relative risks were estimated by stratified analysis and by multiple logistic regression. Among 319 cases of arganulocytosis, 12 patients (4%) gave a history of infectious mononucleosis at least 1 year previously; among 2180 controls the corresponding number was 11 (0.5%) (multivariate relative risk estimate, 6.2; 95% confidence interval, 2.3–17). A nonsignificant elevation in the relative risk was observed for aplastic anemia. The data suggest that infectious mononucleosis may confer a long-term increase in the risk of agranulocytosis. However, the association was an unexpected one, identified in the course of multiple comparisons, and it must be independently confirmed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01695866
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  • 10
    Electronic Resource
    Electronic Resource
    Lysine cataboism and α-aminoadipate synthesis in Streptomyces clavuligerus (1991)
    Springer
    Applied microbiology and biotechnology 35 (1991), S. 358-363 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary The intracellular α-aminoadipic acid pool in Streptomyces glavuligerus mycelium growing in a starch-peptone medium decreased during the late exponential and stationary phases when cephamycin was being produced; however, the amino acid accumulated extracellularly. Although the specific activity of lysine ɛ-aminotransferase (LAT) decreased during this period, there was no indication that the extracellular α-aminoadipic acid functioned as a precursor reserve for synthesis of the β-lactam antibiotic. Measurement of LAT activity in cultures grown in defined media with starch and various nitrogen sources indicated that the enzyme was synthesized preferentially only during early growth. In its insensitivity to induction by a precursor, and in its susceptibility to carbon catabolite repression, LAT behaved as a secondary metabolic pathway enzyme. Unexpectedly, however, the enzyme increased in specific activity when cultures were supplemented with excess phosphate. Unlike LAT, cadeverine aminotransferase was inducible by lysine or cadaverine and insensitive to phosphate; its features were consistent with a role in the catabolism of lysine by S. clavuligerus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00172726
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