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  • 1980-1984  (16)
  • 1983  (16)
  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 105 (1983), S. 330-336 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1600-0765
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Experiments were performed to determine the effect of delayed-type hypersensitivity (DTH; cell mediated immunity) on subsequent periodontal bone loss in monoinfected (Actinobacillus actinomycetemcomitans [A actinomycetemcomitans]) gnotobiotic rats. Foot pad swelling reactions to A actinomycetemcomitans sonicate were used to monitor both immediate hypersensitivity and DTH. DTH was present in A actinomycetemcomitans immunized (I) animals when initially challenged with A actinomycetemcomitans. This DTH was maintained throughout the experimental period Sham-immunized (SI) animals did not show DTH until after 30 days of infection. The cellular infiltrate in the gingiva of immunized animals was relatively more mononuclear than the infiltrate of SI animals Serum IgG antibody to A actinomycetemcomitans was significantly elevated in I compared to SI animals. The relationship between the foot pad swelling and serum antibody levels suggested that an active Arthus type reaction was observed A actinomycetemcomitans injected rats demonstrated an Arthus-type reaction throughout the duration of the experiment SI animals only showed this reaction 30 days after immunization; the extent of swelling was always less than in the I group. Immunized rats demonstrated significantly elevated horizontal bone loss after infection for 90 days. The data suggest that a “mixed” hypersensitivity reaction to A actinomycetemcomitans occurs in presensitized rats and that the presence of this hypersensitivity can be associated with increased periodontal bone loss.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 10 (1983), S. 0 
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Silent periods were evoked from the masseter muscles bilaterally in response to chin taps during a clench. Injection of 0.75 ml of 3% Mepivicaine posteromedial to each condyle led to a distribution of skin anaesthesia consistent with the distribution of the auriculotemporal nerve. Silent periods were evoked prior to and during anaesthesia in ten subjects.The silent period latencies (mean ± standard deviation) prior to anaesthesia were 12.5 ± 1.8 ms and 11.9 ± 2.5ms in the right and left masseters. During anaesthesia the latency decreased by 0.3 ± 1.3 ms in the right masseter and by 0.3 ± 2.1 ms on the left masseter. Neither change was statistically significant (P 〉 0.05).The silent period durations prior to anaesthesia were 20.3 ± 4.0 ms and 22.8 ± 7.1 ms in the right and left masseters. During anaesthesia, these decreased by 2.74 ± 5.8 ms on the right and 2.15 ± 4.4 ms on the left. These decreases were not statistically significant (P 〉 0.05).These results failed to demonstrate an influence of the predominant nerve supply of the TMJ on either the latency or the duration of the masseteric silent period.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 39 (1983), S. 139-148 
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The conditions appropriate for direct structure imaging of silicon carbide polytypes in the high-resolution electron microscope have been investigated. Weak-phase-object calculations confirm that a resolution of better than 2.5 Å is necessary before polytypic stacking sequences can be identified directly. Furthermore, resolutions closely approaching 1 Å are required to resolve projected pairs of Si-C atoms, and considerably better than 1 Å is necessary to differentiate between the two species. Extensive multi-slice calculations, based on both current and projected electron-optical characteristics, show that polytype stacking should be recognizable at 500 kV up to thicknesses of 45-75 Å, but not at 100 kV, except possibly at the 'reversed' Scherzer defocus position with extremely coherent illumination. The occurrence of Fourier images complicates recognition of the correct objective-lens defocus particularly for thin crystals of the 3C polytype. In thicker-crystal regions (≥ 100 Å), where linear image contributions are small, mutual interference between diffracted beams results generally in polytype images of apparently improved resolution and, at specific thickness and defocus values, leads to images of 3C resembling the 'atom-pair' configuration. The latter are then explained by consideration of the image amplitude and intensity spectra. Finally, the problems of recovering specimen structure from crystals of intermediate thickness, as well as some of the factors affecting any quantitative experimental studies, are briefly discussed.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 39 (1983), S. 422-422 
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: As a result of a printer's error, Figs. 9(a) and 9(b) in Smith & O'Keefe [Acta Cryst. (1983), A39, 139-148] have been transposed, so that (a) is labelled (b) and (b) is labelled (a).
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 39 (1983), S. 838-847 
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Computer-simulated electron-microscope images have been produced for several different aromatic hydrocarbons, as well as the organometallic compound chlorinated copper phthalocyanine. Weak-phase-object images are compared with full multislice imaging calculations that include the resolution-limiting effects of limited spatial and temporal coherence; the comparisons indicate a considerable range of focus and thickness where intuitive image interpretation is possible. This favourable situation arises directly from the low atomic numbers of the atoms comprising the molecules and the almost monotonic fall-off with scattering angle of those structure factors within the resolution limit of the microscope. The occurrence and nature of both first- and second-order resolution-limiting effects on typical 100 and 500 kV images is also discussed.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 48 (1983), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A sound velocimeter was used to study the physical structure of aqueous solutions (0.0–1.20 molal) of five monosaccharides, fructose, galactose, glucose, mannose and xylose. Over most of the temperature range employed (20–80°C) adiabatic compressibility of the solutions was the dominant factor in defining sound velocity through and structural rigidity of solution. Analysis of the data also indicated that differences in the solution rigidity of the various monosaccharides was attributable to structural differences among the sugars. At temperatures less than 30°C, where foods are often stored or consumed, fructose produces the most rigid structure followed in descending order by galactose, glucose, mannose and xylose.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 39 (1983), S. 179-180 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The gliding locomotion of planaria (Dendrocoeleum lacteum) was suppressed similarly by LiCl and RbCl.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Earth, moon and planets 28 (1983), S. 1-9 
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract This paper examines the relaxation of planetary surface features in the size range from one to several hundred kilometers. For this purpose a new type of computational method is used. This involves the assumption of axial symmetry and supposes also that motion takes place in a vertical direction only. Although this later assumption may seem restrictive, comparison with results computed by other techniques show that it produces relatively exact results. Furthermore, the method may be easily applied to a wide variety of situations in which for example the viscosity is a function of position time, shear-gradient, and even previous history, as well as cases in which inertial terms are important. In this paper the results of applying the method to two particular problems are briefly described — relaxation under a highly depth-dependent viscosity condition, and the relaxation of lunar mascons.
    Type of Medium: Electronic Resource
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  • 10
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    Unknown
    Chapel Hill, N.C. : Periodicals Archive Online (PAO)
    Social Forces. 61:4 (1983:June) 1147 
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