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  • 1990-1994  (9)
  • 1970-1974  (1)
  • 1965-1969  (3)
  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 511-513 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Carbon-doped GaAs films have been grown by solid-source molecular beam epitaxy using a graphite filament. The films were doped from 1×1015 cm−3 to 5×1019 cm−3 and the resulting mobilities are equivalent to beryllium-doped films. A slight dependence of As4/Ga flux ratio on carbon doping was observed. The use of either As2 or As4 did not significantly affect the carbon doping concentrations. Lattice contractions were observed for films doped heavily with carbon or beryllium. For a given doping concentration the contraction is more significant for carbon doping which is consistent with the smaller tetrahedral covalent radius of carbon compared to beryllium. Good agreement between observed and calculated lattice contractions with carbon doping is obtained. Annealing studies on a film doped with carbon at 5×1019 cm−3 indicate that the electrical properties and lattice contraction are quite stable.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Industrial relations journal 3 (1972), S. 0 
    ISSN: 1468-2338
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: In spite of the fact that the nature of their jobs is becoming closer to that of the manual worker, white collar workers still appear to see themselves in an essentially intermediate status in an organization, and this is reflected in their attitudes towards their work and towards trade unionism.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 202-204 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: GaAs films were doped with carbon up to a hole concentration of 1.3×1020 cm−3 using CBr4 vapor. The material quality of the heavily doped films was found to be better than that obtained using evaporated carbon. Improvements at the highest doping levels include better surface morphology, higher hole mobilities, significantly stronger photoluminescence, and near unity substitutional incorporation. Doping pulses created using CBr4 exhibited abrupt transitions. From the results it is suggested that the material quality of the films doped with evaporated carbon are degraded at high doping levels due to surface combination of reactive carbon species.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Nutrition 10 (1990), S. 277-295 
    ISSN: 0199-9885
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral pathology & medicine 20 (1991), S. 0 
    ISSN: 1600-0714
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: This study demonstrates gluten-sensitive recurrent oral ulceration (ROU) in the absence of gastrointestinal abnormalities which is associated with a humoral response to wheat protein. Ten patients with severe ROU were investigated; all had normal small intestinal biopsies. Four patients had raised levels of antibodies to alpha gliadin, a wheat protein fraction; in three of these four, the ulceration remitted on treatment with a gluten-free diet (G.F.D.) and relapsed on gluten challenge. None of the remaining six patients had raised alpha gliadin antibody (AGA) levels and none responded to G.F.D. Thus raised AGA levels can be used to identify patients with ROU who are likely to respond to a GFD.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 219 (1968), S. 1276-1277 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Little is known about the degree of response of NZB mice to a normal antigenic stimulus, however. Diener's work9 suggested that the number of spleen cells able to produce antibodies against sheep red cells (SRC) is greater in young Coombs negative NZB mice than in comparable C3H mice, and an early ...
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 215 (1967), S. 1084-1085 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Ten adult New Zealand White rabbits were immunized intravenously with 50 mg bovine serum albumin (BSA) either absorbed onto aluminium hydroxide or in conjunction with a heat-killed suspension of Corynebacterium parvum which is a powerful adjuvant11, The rabbits were bled 9 and 12 days later and the ...
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 215 (1967), S. 870-871 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Experiment 1. In the first experiment, eleven newborn New Zealand White rabbits were injected intraperitoneally with 2 mg (dry weight) of a heat-killed suspension of C. parvum2 less than 12 h after birth and they, together with ten control rabbits, were injected intraperitoneally with 100 mg BSA 6 ...
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The phagocytic activity of mononuclear phagocytes of A/J mice and Wistar rats was estimated by the carbon clearance test following injection of Mycoplasma arthritidis. In mice, the overall phagocytic activity was significantly increased at the end of the first week (P 〈 0.0001), but the increase was marginal by the third and fourth weeks after injection. A significant increase in the relative weight of liver and spleen was observed even when phagocytic activity had returned to levels similar to those of controls (P 〈 0.001). In rats, the overall phagocytic activity was significantly increased until the fourth week (P 〈 0.00001). There was not, however, an increase in the relative weight of liver and spleen as observed for the mice. The results are discussed in the context of factors contributing to the pathogenic mechanisms responsible for differences in the patterns of arthritis due to mycoplasma observed in mice and rats.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    International journal of legal medicine 105 (1993), S. 333-338 
    ISSN: 1437-1596
    Keywords: Bacterial-toxins ; SIDS ; Bakterien-Toxine ; SIDS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Law
    Description / Table of Contents: Zusammenfassung In einigen Fällen des Sudden Infant Death Syndrom (SIDS) wurde die Rolle Toxin bildender Bakterien diskutiert. Obwohl es keinen Beweis gibt, daß Clostridia spp. mit SIDS in Großbritanien assoziiert sind, sind von signifikanter Anzahl dieser Kinder bei der Autopsie Stämme von Stapylokkokus aureus isoliert worden, welche Fieber erzeugende Toxine produzieren. Die Fieber erzeugenden Toxine, welche von einigen Stämmen der Gruppe A Streptokkokus pyogenes produziert werden, wie auch von Staphylokkoken, sind mächtige „Superantigene”, welche signifikante physiologische Effekte haben unter Einbeziehung der Induktion von Fieber mit mehr als 38°C. In diesem Artikel werden Interaktionen zwischen genetischen und Umgebungsfaktoren erörtert, welche die Kolonisierung epithelialer Oberflächen durch Toxin bildende Staphylokkoken steigern könnten: die Expression des Lewisa Antigens des Kindes, welches als Rezeptor für einige Mikroorganismen wirksam ist; virale Infektionen; die Auswirkung des mütterlichen Rauchens auf die Empfänglichkeit für Atemwegsinfektionen. Basierend auf epidemiologischen Befunden und Laboratoriumsuntersuchungen wird eine Hypothese vorgeschlagen, wie Bakterien; welche pyrogene Toxine produzieren, zu einigen plötzlichen Kindstodesfällen beitragen könnten.
    Notes: Summary Toxigenic bacteria have been implicated in some cases of Sudden Infant Death Syndrome (SIDS). Although there is not much evidence thatClostridia spp. are associated with SIDS in Britain, strains ofStaphylococcus aureus producing pyrogenic toxins have been isolated from significant numbers of these infants at autopsy. The pyrogenic toxins, produced by some strains of group AStreptococcus pyogenes as well as staphylococci, are powerful “superantigens” that have significant physiological effects including induction of fever 〉 38°C. In this article, interactions between genetic and environmental factors that might enhance colonization of epithelial surfaces by toxigenic staphylococci are analyzed: infant's expression of Lewisa antigen which acts as a receptor for some microorganisms; viral infections; the effect of mother's smoking on susceptibility to respiratory infection. Based on epidemiological findings and laboratory investigations, a hypothesis is proposed to explain how bacteria producing pyrogenic toxins might contribute to some cot deaths.
    Type of Medium: Electronic Resource
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