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  • Blackwell Science Inc  (1)
  • Blackwell Science Ltd  (1)
  • Nature Publishing Group  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Al–Al2O3 Composites with Interpenetrating Network Structures: Composite Modulus Estimation (2005)
    Oxford, UK : Blackwell Science Inc
    Journal of the American Ceramic Society 88 (2005), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The effective Young's moduli of co-continuous Al–Al2O3 composites over the 5–97 vol% Al2O3 composition range were experimentally measured and compared with theoretical composite modulus values predicted using the methods of Ravichandran, Tuchinskii, Hashin-Shtrikman, and the effective medium approximation (EMA). The influence of phase morphology and the modulus ratio (E1/E2) of the constituent phases on the resulting experimental and calculated Young's modulus is discussed. For two-phased co-continuous composites with a modulus ratio greater than 5, the EMA, with an appropriate microstructural shape factor, was the most consistent method for approximating the composite Young's modulus over the entire composition range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00115.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    An atypical mitogen-activated protein kinase controls cytokinesis and flagellar motility during male gamete formation in a malaria parasite (2005)
    Oxford, UK : Blackwell Science Ltd
    Molecular microbiology 58 (2005), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: The transmission of malaria parasites to the mosquito depends critically on the rapid initiation of sexual reproduction in response to triggers from the mosquito midgut environment. We here identify an essential function for an atypical mitogen-activated protein kinase of the rodent malaria parasite Plasmodium berghei, Pbmap-2, in male sexual differentiation and parasite transmission to the mosquito. A deletion mutant no longer expressing the Pbmap-2 protein develops as wild type throughout the asexual erythrocytic phase of the life cycle. Gametocytes, the sexual transmission stages, form normally and respond in vitro to the appropriate environmental cues by rounding up and emerging from their host cells. However, microgametocytes fail to release flagellated microgametes. Female development is not affected, as judged by the ability of macrogametes to become cross-fertilized by microgametes from a donor strain. Cellular differentiation of Pbmap-2 KO microgametocytes is blocked at a late stage of male gamete formation, after replication and mitoses have been completed and axonemes have been assembled. These data demonstrate a function for Pbmap-2 in initiating cytokinesis and axoneme motility, possibly downstream of a cell cycle checkpoint for the completion of replication and/or mitosis, which are extraordinarily rapid in the male gametocyte.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2958.2005.04793.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Use of Multiphase Oscillators with a Cyclotron (Lawrence) for the Production of High-Velocity Particles (1936)
    [s.l.] : Nature Publishing Group
    Nature 137 (1936), S. 316-317 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE cyclotron at present has a limited voltage amplification due, in part, to a space charge built up within the duants. The space charge density may be lowered by reducing the intensity of the ion beam alone, or by increasing the high-frequency alternating potential on the duants, thereby ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/137316b0
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    Paper (German National Licenses)
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