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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 42 (1959), S. 117-126 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Zusammenfassung Es wurden die Eigenschaften von Kondensationskernen untersucht, die durch Koronaentladung von einer Metallspitze erzeugt wurden. Die Spannungsschwelle für die Erzeugung von Kondensationskernen und kleinen Ionen ist die gleiche. Der Bruchteil der Kerne, welche geladen sind, ist anfangs klein und wird nach einigen Sekunden praktisch null. Es wird gezeigt, dass in dem inhomogenen Felde nahe der Spitze eine Kraft auf die Kerne wirkt, welche sie zur Spitze treibt. Aus Bestimmungen des Diffusionskoeffizienten wird versuchsweise geschlossen, dass wenigstens ein Teil der Kerne ursprünglich molekulare Grösse hat. Keine befriedigende Erklärung für gewisse anomale Eigenschaften der zeitlichen Änderungen der Grösse und Konzentration der Kerne nach ihrer Erzeugung wurde gefunden.
    Notes: Summary The properties of condensation nuclei generated at a metal point corona discharge have been examined. The threshold voltages for nucleus production and for small ion production are the same. The fraction of the nuclei which is charged is initially small and becomes virtually zero after a few seconds. It is demonstrated that in the non-uniform field near the point there is a force on the nuclei driving them to the point. From determinations of the diffusion coefficient it is tentatively concluded that a portion at least of the nuclei are originally of molecular size. No satisfactory explanation has been found for certain anomalous features of the variations in size and in concentration of the nuclei with time after production.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Inorganic Biochemistry 19 (1983), S. 203-211 
    ISSN: 0162-0134
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 230 (1971), S. 187-189 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Ten to fifteen-week old male mice of the CBA strain were used. Washed sheep red blood cells (SRBC) and horse red blood cells (HRBC) were used as antigens. Intraperitoneal injections except when stated otherwise were of 5 x 108 cells in 0.2 ml. physiological saline. Subcutaneous injections were of 5 ...
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1365-2826
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Melanin-concentrating hormone (MCH) is implicated in the control of a number of hormonal axes including the hypothalamic-pituitary adrenal (HPA) axis. Previous studies have shown that there is evidence for both a stimulatory and an inhibitory action on the HPA axis; therefore, we attempted to further characterize the effects of MCH on this axis. Intracerebroventricular injection of MCH increased circulating adrenocorticotropic hormone (ACTH) at 10 min post injection. Injection of MCH directly into the paraventricular nucleus (PVN) was found to increase both circulating ACTH and corticosterone 10 min after injection. Additionally, MCH was found to increase corticotropin-releasing factor (CRF) release from hypothalamic explants, and this effect was abolished by the specific SLC-1 antagonist SB-568849. Neuropeptide EI, a peptide from the same precursor as MCH was also found to increase CRF release from explants. These results suggest that MCH has a stimulatory role in the HPA axis via SLC-1, and that MCH exerts its effects predominantly through the PVN CRF neuronal populations
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Zoologica Scripta 4 (1975), S. 229-251 
    ISSN: 0300-3256
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of inherited metabolic disease 7 (1984), S. 168-170 
    ISSN: 1573-2665
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract An animal model for Menkes' kinky hair syndrome is provided by mice mutant at the X-linked mottled locus. Two mechanisms have been invoked to explain disease manifestations in mottled and in kinky hair syndrome: (i) relative tissue copper deficiencies and corresponding reductions in cuproenzyme activities; or (ii) defective intracellular copper utilization, with impaired intracellular translocation to cuproenzymes or to copper-dependent processes. We addressed the second possibility through measurements of soluble superoxide dismutase (SOD-1) in cytosol extracts of confluent mottled (blotchy) cultured skin fibroblasts. At comparable intracellular copper concentrations over a broad range, SOD-1 specific activities in the mutant cells were not distinguishable from those in controls, or, in some instances, were actually higher. These data suggest that the excess copper anomalously sequestered in a cell expressing the mutation remains available for binding to a cytosolic cuproenzyme. When taken together with data in other systems, the results are consistent with the thesis that the basic lesion in blotchy may primarily affect copper transport or delivery to specific copper transport systems.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1573-1561
    Keywords: Colletes spp. ; bees ; Hymenoptera ; Colletidae ; Dufour's gland secretion ; nest cell lining
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The liquid secretion of the Dufour's gland in mated females comprises a mixture of macrocyclic lactones, straight chain mono- and dicarboxylic acids, together with trace amounts of di- and trihydroxy monocarboxylic acids and a series ofn-alkanes. Polymerization of the liquid to form the membranous nest cell lining, which also contains alanine and glutamic acid as major constituents, may be mediated by an enzyme from the thoracic salivary gland and voided via the mouth. The composition and structure of the cell linings are similar to those of Wigglesworth's “cuticulin.”
    Type of Medium: Electronic Resource
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