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  • 2000-2004  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Effects of dust charging associated with an electron beam in the cathode sheath of glow discharges (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 1053-1055 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The charging of dust particles caused by the thermal electrons, the cold ions, and the electron beam released from a plane cathode, including secondary emission of dust in a collisionless cathode sheath of glow discharges, is investigated with a self-consistent theoretical model. Effects of the dust charging relevant to the electron beam including secondary emission of dust are important to the dust potential in the close cathode region. Collection of electrons from the electron beam by dust leads to a decline in the dust potential, but secondary emission of dust by the electron beam impact causes a rise in the dust potential. The dust potential can be negative in the whole sheath if an electron beam emitted from a cathode is strong enough. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873907
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Requirement of spermidine for developmental transitions in Aspergillus nidulans (2002)
    Oxford, UK : Blackwell Science Ltd
    Molecular microbiology 46 (2002), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Deletion of the spermidine synthase gene in the fungus Aspergillus nidulans results in a strain, ΔspdA, which requires spermidine for growth and accumulates putrescine as the sole polyamine. Vegetative growth but not sporulation or sterigmatocystin production is observed when ΔspdA is grown on media supplemented with 0.05–0.10 mM exogenous spermidine. Supplementation of ΔspdA with ≥ 0.10 mM spermidine restores sterigmatocystin production and ≥ 0.50 mM spermidine produces a phenotype with denser asexual spore production and decreased radial hyphal growth compared with the wild type. ΔspdA spores germinate in unsupplemented media but germ tube growth ceases after 8 h upon which time the spores swell to approximately three times their normal diameter. Hyphal growth is resumed upon addition of 1.0 mM spermidine. Suppression of a G protein signalling pathway could not force asexual sporulation and sterigmatocystin production in ΔspdA strains grown in media lacking spermidine but could force both processes in ΔspdA strains supplemented with 0.05 mM spermidine. These results show that increasing levels of spermidine are required for the transitions from (i) germ tube to hyphal growth and (ii) hyphal growth to tissue differentiation and secondary metabolism. Suppression of G protein signalling can over-ride the spermidine requirement for the latter but not the former transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2958.2002.03201.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The Impact of the Prospective Payment System on the Technical Efficiency of Hospitals (2000)
    Springer
    Journal of medical systems 24 (2000), S. 159-172 
    Details
    ISSN: 1573-689X
    Keywords: prospective payment system ; technical efficiency ; DEA analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In a longitudinal panel study design, 80 hospitals in Virginia were selected for analysis to test the hypothesis that the introduction of the prospective payment system (PPS) in October 1983 had helped hospitals enhance their operational performance in technical efficiency. A non-parametric method called Data Envelopment Analysis (DEA) was used to calculate and compare the efficiency scores for each peer group of hospitals (by bed size) between the year 1984 and the year 1993. Contrary to expectations, no significant difference in technical efficiency was found in each hospital peer group over the study period. Nevertheless, the case study demonstrates that if hospital managers use this analytical tool appropriately, they may spot where any organizational weakness lies and how they can improve it.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005542324990
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    Paper (German National Licenses)
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