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  • 1
    Electronic Resource
    Electronic Resource
    J aggregate sensitization of zinc oxide electrodes as studied by internal reflection spectroscopy (1985)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 89 (1985), S. 1448-1453 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100254a029
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  • 2
    Electronic Resource
    Electronic Resource
    Reactions of sulfenyl chlorides and their derivatives. 25. Reaction of chloride ion with thiiranium ions prepared by two different methods (1987)
    s.l. : American Chemical Society
    The @journal of organic chemistry 52 (1987), S. 2403-2407 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00388a013
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  • 3
    Electronic Resource
    Electronic Resource
    Computer microtechnology for a severely disabled preschool child (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Child 14 (1988), S. 0 
    Details
    ISSN: 1365-2214
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine , Psychology
    Notes: Summary The developments and considerations essential to providing microtechnological aids for a preschool severely disabled child confined to a bed in a hospital ward are described. This single case report illustrates the needs of a quadriplegic boy dependent on a ventilator via a tracheostomy. Provision of a computer, a variety of specially designed switches and software together with a self-driven powered wheelchair maximized expression of his developmental needs. The decision-making process of providing the equipment is described as well as the problems encountered. His development in language and cognitive skills is discussed in the context of his change in experience and competence as he learned to control the technological aids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2214.1988.tb00566.x
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  • 4
    Electronic Resource
    Electronic Resource
    Light-initiated surface modification of oxide semiconductors with organic dyes (1988)
    s.l. : American Chemical Society
    Langmuir 4 (1988), S. 861-867 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00082a014
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  • 5
    Electronic Resource
    Electronic Resource
    Natural and synthetic leucites studied by solid state 29-Si and 27-Al NMR and 57-Fe Mossbauer spectroscopy (1987)
    Springer
    Physics and chemistry of minerals 15 (1987), S. 78-83 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract The 29-Si NMR spectra of natural and synthetic leucites (KAlSi2O6) are found to contain a number of resonances which are interpreted in terms of the known structure of low-temperature (tetragonal) leucite. Computer simulation of the spectra suggests that the most distorted tetrahedral lattice site T 1 contains a higher proportion of Al than the other two tetrahedral sites. The occurrence of some ordering of the tetrahedral Si and Al in leucite is confirmed by Mossbauer studies of synthetic iron-containing leucites, including the fully ferric end-member KFeSi2O6, in which the three tetrahedral sites can be distinguished. On replacement of about half this Fe by Al, the most distorted of these sites is lost from the spectrum, reflecting the preference of Al for this site. A linear relationship is found between the unit cell dimensions of all these leucites and their iron content.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307612
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  • 6
    Electronic Resource
    Electronic Resource
    An estimate of the contribution of high nergy cosmic-ray protons to the absorbed dose inventory of a cometary nucleus (1986)
    Springer
    Astrophysics and space science 125 (1986), S. 49-67 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We discuss the contribution of cosmic-ray protons at all energies above 1 MeV to the absorbed doses of the surface layers of a comet. Since there exists no calculation which takes into account proton energy losses by means of losses to electrons and nuclear collisions (in a cascade process), and losses due to the low energy end-products of the cascade, we have made a rough estimate of all of these contributions. An analytical formula is proposed that allows a rapid estimate of ranges and the dose absorbed at any depth. We give dose-depth curves for two extreme values of the energy at which nuclear collisions begin to dominate the slowing-down process, and for an intermediate value we display the dose-depth curve down to 20 m from the surface. The relevance of these findings to dosimetry in comets and some alterations of cometary material are considered. The need for improving the analytical expression proposed is stressed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00643971
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  • 7
    Electronic Resource
    Electronic Resource
    Plant-insect coevolution and inhibition of acetylcholinesterase (1988)
    Springer
    Journal of chemical ecology 14 (1988), S. 1965-1975 
    Details
    ISSN: 1573-1561
    Keywords: Herbivory ; pheromones ; chemical defense ; monoterpenes and diterpenes ; insect paralysis and mortality ; enzyme evolution ; coevolution ; acetylcholinesterase inhibition ; plant-insect coevolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The theory of plant-insect coevolution provides for diffuse coevolution and the expectation that plants evolve broad-spectrum chemical defenses with which some insects coevolve by detoxifying and using the compounds as host-location cues. Specific biochemical modes of action have been assigned to relatively few such defense chemicals and one major class, the terpenoids, is investigated here. Six terpenoids inhibited the enzyme acetylcholinesterase (derived from electric eel) and elicited the appropriate in vivo effects of insect paralysis and mortality. The diterpene gossypol was a reversible uncompetitive inhibitor. Five monoterpenes, representing a range of functional groups, were reversible competitive inhibitors apparently occupying at least the hydrophobic site of the enzyme's active center. Such data suggest the involvement of acetylcholinesterase in the coevolved insect response to terpenoids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01013489
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  • 8
    Electronic Resource
    Electronic Resource
    “Alternative” mating behavior in the swordtails Xiphophorus nigrensis and Xiphophorus pygmaeus (Pisces: Poeciliidae) (1989)
    Springer
    Behavioral ecology and sociobiology 24 (1989), S. 341-348 
    Details
    ISSN: 1432-0762
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The swordtail Xiphophorus nigrensis exhibits three relatively discrete male body-size classes that derive from allelic variation at the Y-linked pituitary (P) locus. Previous studies have shown that larger males have greater relative reproductive success, and that females prefer large males. We describe the mating behavior utilized by males of each size class during individual encounters with females. Small males rely on “chase” behavior, similar to the alternative mating behavior classified as ‘sneaker” in small males of other species. Large males court and intermediate-sized males court or chase, depending on their body size. There is a strong correlation between P alleles for small size (s) and large size (L) with chasing and courting, respectively. The relationship between mating behavior of males of the genotype I is ambiguous. In the closely related species X. pygmaeus, males are of size similar to smaller X. nigrensis males. Paradoxically, these males do not show the courtship display that typifies larger male X. nigrensis and many other species of swordtails, but instead often employ chase behavior identical to the alternative mating behavior in small male X. nigrensis. We suggest that historical and genetic constraints, in addition to current selection forces, might be important factors in explaining the existence of alternative mating behavior in X. pygmaeus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00293262
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  • 9
    Electronic Resource
    Electronic Resource
    A destructive discovertebral lesion: Septic discitis, ankylosing spondylitis, or rheumatoid arthritis ? (1989)
    Springer
    Clinical rheumatology 8 (1989), S. 277-281 
    Details
    ISSN: 1434-9949
    Keywords: Discovertebral Lesions ; Spondylodiscitis ; Ankylosing Spondylitis ; Rheumatoid Arthritis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A 41-year-old male with a 20-year history of classical ankylosing spondylitis, psoriasis and seropositive, nodular erosive rheumatoid arthritis presented with a 12-month history of thoracolumbar junction pain following minor trauma. A pseudoarthrosis was noted at the T11/12 level on plain radiographs and tomograms. A gallium scan showed no increased isotope uptake, and a computed tomogram (CT) revealed no evidence of a paraspinal collection. Conservative management including cast immobilisation and local radiotherapy was ineffective, and spinal fusion was required. A typical Andersson lesion was found at operation. The diagnostic and therapeutic problems of such discovertebral lesions are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02030087
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  • 10
    Electronic Resource
    Electronic Resource
    Extrusion behavior of filled polymeric systems exhibiting an apparent yield stress (1988)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 28 (1988), S. 453-459 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: An investigation was undertaken to study the extrusion behavior of composite systems. A compound made up of approximately 50 percent ceramic particulates by volume dispersed in a high molecular weight thermoplastic polymer was characterized by measuring the shear viscosity on an Instron capillary viscometer. The experimental data indicated that the ceramic composite exhibited an apparent yield stress. As a result, an expression that was previously shown to provide flexibility for describing a yield stress at low rates of deformation could explain the viscosity of the ceramic composite. The expression was then applied to the flow analysis of both a “rod” and a “slit” die in an extrusion process, and the derived equations adequately correlated experimental volumetric flow rate us. Pressure drop data obtained on a laboratory extruder.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760280708
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