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  • 1
    Electronic Resource
    Electronic Resource
    Isotopically Substituted Bis(ethylenedithio)tetrathiafulvalene at 15K by Time-of-Flight Neutron Diffraction (1997)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 53 (1997), S. 961-963 
    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/S0108270197003077
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  • 2
    Electronic Resource
    Electronic Resource
    A co-twin study of the effect of calcium supplementation on bone density during adolescence (1997)
    Springer
    Osteoporosis international 7 (1997), S. 219-225 
    Details
    ISSN: 1433-2965
    Keywords: Adolescence ; Bone density ; Calcium supplementation ; Twins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The effect of calcium supplementation on bone mineral density (BMD) was evaluated in female twin pairs aged 10–17 years with a mean age of 14 years. Forty-two twin pairs (22 monozygotic, 20 dizygotic; (including one monozygotic pair from a set of triplets) completed at least 6 months of the intervention: 37 pairs to 12 months and 28 pairs to 18 months. BMD was measured by dual-energy X-ray absorptiometry (DXA). In a double-blind manner, one twin in each pair was randomly assigned to receive daily a 1000 mg effervescent calcium tablet (Sandocal 1000), and the other a placebo tablet similar in taste and appearance to the calcium supplement but containing no calcium. Compliance (at least 80% tablets consumed), as measured by tablet count, was 85% in the placebo group and 83% in the calcium group over the 18 months of the study, on average increasing dietary calcium to over 1600 mg/day. There was no within-pair difference in the change in height or weight. When the effect of calcium supplementation on BMD was compared with placebo at approximately 6, 12 and 18 months, it was found that there was a 0.015±0.007 g/ cm2 greater increase in BMD (1.62±0.84%) at the spine in those on calcium after 18 months. At the end of the first 6 months there was a significant within-pair difference of 1.53±0.56% at the spine and 1.27±0.50% at the hip. However, there were no significant differences in the changes in BMD after the initial effect over the first 6 months. Therefore, we found an increase in BMD at the spine with calcium supplementation in females with a mean age of 14 years. The greatest effect was seen in the first 6 months; thereafter the difference was maintained, but there was no accelerated increase in BMD associated with calcium supplementation. The continuance of the intervention until the attainment of peak bone mass and follow-up after cessation of calcium supplementation will be important in clarifying the optimal timing for increased dietary calcium and the sustained, long-term effects of this intervention.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01622292
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Bovine papillomavirus E5 oncogene stimulates DNA synthesisin C127 fibroblasts without general effects on growth factor responsive protein phosphorylations (1997)
    Springer
    Archives of virology 142 (1997), S. 953-964 
    Details
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary.  The bovine papillomavirus (BPV) transforming gene E5 is thought to modulate growth factor receptor function leading to a stimulation of growth factor signal transduction pathways. However, the influence of E5 on the range of receptor mediated changes in protein phosphorylation has not been addressed. We looked for the influence of E5 on DNA synthesis as well as the phosphorylation of over 1000 cellular phosphoproteins in mouse C127 fibroblasts and subclones harboring wild type (ID13)-, E5- mutant (XL3-2), and E6- (E6oCl) mutant BPVs. The cells containing E5 had an altered growth response to fresh serum or PDGF but we observed no general influences of E5 transformation on sets of serum-, phorbol ester-, and PDGF-responsive phosphoproteins, comprising 25, 18, and 16 overlapping members, respectively. Indeed, most of the phosphoproteins comprising these sets remain equally responsive to these growth factors in all four cell lines. The only evidence of an E5-specific influence on protein phosphorylation was with 4 phosphoproteins, two whose PDGF-responsiveness was abolished and two with abolished serum-, phorbol ester- and PDGF-responsiveness. Thus E5 modulates only a subset of the cascade of receptor-mediated downstream protein phosphorylations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007050050131
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Thermoanalytical evaluation of readily available reference polymers (1997)
    Springer
    Journal of thermal analysis and calorimetry 49 (1997), S. 425-435 
    Details
    ISSN: 1572-8943
    Keywords: reference polymers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A commercial set of polymers has been characterized by TG-DTA, DSC, TMA, FTIR spectroscopy and X-ray diffraction analysis (XRD). Thermal and mechanical stability, as well as the polymer glass transition temperature,T g, and melt temperature,T m, have been documented. There is a good correlation between measuredT g andT m values and published data. The degree of polymer crystallinity for polyethylene has been verified by XRD. The credibility and stability of these reference polymers is based on a comparison of their thermal properties, over a wide range of temperatures from two versions of a reference set, published in 1979 (A) and 1994 (B). The thermal properties and crystallinity of these polymers have stood the test of time and are reliable, readily available and consistent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01987466
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of nanocrystallization on the corrosion resistance of K38G superalloy in CO + CO2 atmospheres (1997)
    Springer
    Oxidation of metals 48 (1997), S. 497-509 
    Details
    ISSN: 1573-4889
    Keywords: corrosion ; CO + CO2 ; K38G alloy ; grain-boundary diffusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The corrosion resistance of the cast superalloy K38G and a sputtered nanocrystalline coating of the same material was investigated in pure CO in the temperature range, 850–1000°C and in CO-20 vol.% CO2 at 900°C. The cast K38G alloy formed Cr2O3 and TiO2 scales, and a zone of internal Al2O3 precipitation. Weight-gain kinetics followed the parabolic rate law under all conditions investigated. The sputtered K38G nanocrystalline coating, however, formed a single-phase Al2O3 scale and no internal-oxidation zone. The parabolic rate constants for nanocrystalline coating oxidation were about one order of magnitude smaller than those of the cast alloy. The changes in reaction morphology and rate are attributed to the more rapid grain-boundary diffusion of aluminum in the nanocrystalline material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02153462
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Digital imaging characterization of the kinematics of water-sediment interaction (1997)
    Springer
    Water, air & soil pollution 99 (1997), S. 173-177 
    Details
    ISSN: 1573-2932
    Keywords: sediment transport ; transient flow fields ; laboratory measurements ; digital patricle tracking velocimetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Digital imaging techniques especially geared towards the laboratory characterization of the kinematics of water-sediment interaction are presented. More specifically, the methods proposed apply to the motion of cohesionless spherical particles in transient water flow, with the aim of obtaining both particle velocity and concentration fields from sequences of digital images. A special particle identification algorithm is devised in order to deal with densely packed particles (in contrast to the sparase seedings of tracers used in studies of pure fluid kinematics) and to allow application of digital particle tracking velocimetry (DPTV). A procedure for extracting the concentration field from the knowledge of the discrete positions is then detailed. Finally, the various tools are illustrated for the laboratory case of a dambreak wave over a movable bed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02406856
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  • 7
    Electronic Resource
    Electronic Resource
    Digital Imaging Characterization of the Kinematics of Water-Sediment Interaction (1997)
    Springer
    Water, air & soil pollution 99 (1997), S. 173-177 
    Details
    ISSN: 1573-2932
    Keywords: sediment transport ; transient flow fields ; laboratory measurements ; digital particle tracking velocimetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Digital imaging techniques especially geared towards the laboratory characterization of the kinematics of water-sediment interaction are presented. More specifically, the methods proposed apply to the motion of cohesionless spherical particles in transient water flow, with the aim of obtaining both particle velocity and concentration fields from sequences of digital images. A special particle identification algorithm is devised in order to deal with densely packed particles (in contrast to the sparse seedings of tracers used in studies of pure fluid kinematics) and to allow application of digital particle tracking velocimetry (DPTV). A procedure for extracting the concentration field from the knowledge of the discrete particle positions is then detailed. Finally, the various tools are illustrated for the laboratory case of a dambreak wave over a movable bed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018305004205
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    Paper (German National Licenses)
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