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  • Electronic Resource  (31)
  • 1990-1994  (21)
  • 1985-1989  (8)
  • 1960-1964  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 553 (1989), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1600-0765
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of periodontal research 27 (1992), S. 0 
    ISSN: 1600-0765
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Phospholipase A2 (PLA2) is a proinflammatory enzyme in the synovial fluids of all - and sera of some - patients with rheumatoid arthritis. Due to the similarities in pathogenesis between rheumatoid arthritis and periodontitis, we sought to study the enzymatic properties of PLA2 in periodontal tissue. In this study, we demonstrated PLA2 activity in rat gingival tissue, about 80% of which was present in the cytosolic fraction. We characterized the cytosolic PLA2 enzyme with respect to substrate specificity, sensitivity to detergent, Ca2+ ion dependency and optimum pH. We found that phosphatidylethanolamine, rather than phosphatidylcholine, was the preferred substrate, the Ca2+ ion was essential for the expression of PLA2 activity, the enzyme was active over a broad pH range, with the optimum at pH 9.0, and sodium-deoxycholate inhibited the enzyme activity strongly in a concentration-dependent manner. These results are consistent with those which have been obtained with synovial fluid PLA2 and suggest that gingival PLA2 may be involved in the pathogenic processes of gingivitis and periodontitis.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 46 (1990), S. 1745-1747 
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 195 (1962), S. 555-557 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A PRELIMINARY investigation of geomagnetic variation in the antarctic region1 has shown that the geomagnetic daily variation field, Sq, on quiet days in the dark polar region, is almost an extension of the well-known Sq -field in temperate latitudes, Sq0, but in the sun-lit polar region, a ...
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 47 (1991), S. 200-201 
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 63 (1992), S. 273-281 
    ISSN: 1570-7458
    Keywords: Diapause ; photoperiod ; rice stem maggot ; Chlorops oryzae ; Chloropidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Chlorops oryzae is bivoltine in northern Japan but trivoltine in the southern part of the country. In the bivoltine strain, both the egg and larval stages were found to be sensitive to photoperiod. When the egg stage was exposed to a long-day photoperiod (16L:8D), larval development showed a short-day type response, and mature third-instar larvae entered a summer diapause under a long-day photoperiod (15L:9D). When eggs experienced short days, the first-instar larvae entered a winter diapause under short-day conditions, and the critical photoperiod in the larval stage ranged from about 14L:10D to about 12L:12D as the photoperiod experienced by the eggs increased from 12L:12D to 14L:10D. However, the development of the larvae after overwintering was not influenced by the photoperiod. In the trivoltine strain, larval development was retarded under a 14L:10D photoperiod but not under either shorter or longer photoperiods, when larvae had spent the egg stage under a 16L:8D photoperiod. The critical photoperiod of the larval stage for the induction of a winter diapause in the first instar was about 12L:12D, though it varied to some extent with the photoperiod during the egg stage. Thus, Chlorops oryzae was able to adapt itself to the local climatic conditions by the development of variable and complicated photoperiodic responses.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of applied electrochemistry 23 (1993), S. 1251-1258 
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract TiN, TiC, TiC/TiN, and Mo electrodes for an Alkali Metal Thermo-Electric Converter (AMTEC) were prepared by ceramic processing and their cathodic polarization characteristics were studied at 600–800°C. The polarization characteristics for TiN and TIC electrodes were similar to those for the Mo electrode. Among three kinds of TiC electrodes with different morphologies, the electrode consisting of finer grains gave a higher power density (0.40 W cm−2). The activation energies for the exchange current density were smaller for ceramic electrodes than for the Mo electrode. In the high current density region above about 1 A cm−2, a limiting current region appeared. When the vacuum level of the low temperature region, which was controlled by introduction of argon, was below 10 Pa, the power density did not depend on the vacuum level but, above 10 Pa, the power density decreased with increase of argon pressure.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Astrophysics and space science 119 (1986), S. 135-139 
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    International journal of legal medicine 98 (1987), S. 49-55 
    ISSN: 1437-1596
    Keywords: Tetrahydrofuran, in histologic materials ; Tetrahydrofuran, Nachweis in biologischem Material
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Law
    Description / Table of Contents: Zusammenfassung Der Einsatz und die Kombination von GC, GC/MS und Headspace-Variante ermöglicht die Routine-Analyse von Tetrahydrofuran (THF) in biologischem Material. Probleme mit der Headspace-Methode, die auf die beträchtliche Wasser- und Lipidlöslichkeit dieser Substanz zurückgehen, konnten durch eine Aussalz-Technik gelöst werden. Bei Konzentrationen von über 5 μg pro Probe wurde die Identifizierung massenspektrometrisch durchgeführt. Im Rahmen quantitativer Bestimmungen kam bei der GC Tetrahydropyran (Pentamethylen-oxid) bzw. bei der GC/SIM octadeuteriertes THF (TDF) als innerer Standard zum Einsatz. THF konnte bis zu 1 μg pro Probe mittels GC und bis zu 0,1 μg pro Probe mittels GC/SIM nachgewiesen werden. Bei Labortieren wurden Maximalspiegel von THF im Blut ungefähr 1 h nach oraler Applikation beobachtet; die Halbwertszeit lag bei etwa 5 h. Das Verteilungsverhältnis zwischen Gewebe und Blut war etwa 1,5–2 bei Fettgewebe und Niere bzw. praktisch übereinstimmend bei Gehirn, Leber, Milz und Muskulatur.
    Notes: Summary Routine analysis of tetrahydrofuran (THF) in biologic materials has become feasible using GC and GC/MS and the headspace method. Problems of the headspace method and this substance which has a high water-and lipid-solubility were overcome by using the salting-out technique. Identification was made by mass spectral examination, in case of concentrations over 5 μg per sample. For quantitative determinations, tetrahydropyran (pentamethylene oxide) was used as an internal standard in GC, and a stable isotopic substance, octadeuterated THF (TDF) in GC/SIM. THF was detected in 1 μg per sample by GC, and 0.1 μg per sample by GC/SIM. THF blood levels in laboratory animals reached their highest values about 1 h after the oral administration, and the half-life was about 5 h. Ratios of tissue levels to blood were ca. 1.5–2 in the adipose tissue and kidney, and fairly equal in the brain, liver, spleen, and muscle.
    Type of Medium: Electronic Resource
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