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  • 1
    Electronic Resource
    Electronic Resource
    New organosols of ZnS and HgS in N,N-dimethylformamide and dimethyl sulfoxide. Use in the preparation of semiconductive polymer-metal sulfide composite films (1987)
    Springer
    Colloid & polymer science 265 (1987), S. 922-924 
    Details
    ISSN: 1435-1536
    Keywords: Organosol ; zinc sulfide ; mercury sulfide ; semi-conductor ; polymer composite
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Organosols of ZnS and HgS in N,N-dimethylformamide (DMF) and dimethyl sulfoxide (DMSO) were prepared by reaction of Zn and Hg salts with H2S. ZnS in the DMF organosol has a particle size of about 300 Å, determined by an argon laser scattering technique. The form of HgS in the organosols varies with temperature, concentration of HgS, and type of solvent;β-HgS in a DMF organosol is converted intoα-HgS at −30 °C or above. Poly(acrylonitrile)-ZnS or -HgS composite films prepared from organosols are semiconductive, and the electrical conductivity of the film increases by a factor of 102–103 on exposure to moisture or alcohol vapour. Poly(acrylonitrile)-β-HgS composite films, prepared from heatedβ-HgS, show electrical conductivity of a range of 10−1–10−2 S cm−1 and a large electron mobility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01421823
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Phosphorylation-dephosphorylation is involved in Ca2+-controlled cytoplasmic streaming of characean cells (1987)
    Springer
    Protoplasma 136 (1987), S. 161-169 
    Details
    ISSN: 1615-6102
    Keywords: Characeae ; Ca2+ ; Cytoplasmic streaming ; Protein phosphatase ; Protein phosphatase inhibitor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The mechanism of Ca2+ regulation of the cytoplasmic streaming in characean cells was studied in relation to protein phosphorylation and dephosphorylation. A tonoplast-free cell model was developed which was sensitive to Ca2+. Protein phosphatase-1 and its inhibitor-1 were applied into the tonoplast-free cells. A synthetic inhibitor of protein phosphatase, α-naphthylphosphate, was applied either to tonoplast-free cells from inside or to the outside of plasmalemma-permeabilized cells which are known to be very sensitive to Ca2+. ATP-γ-S applied to permeabilized cells strongly inhibited the recovery of the streaming which had been stopped by 10 μ M Ca2+. Both inhibitor-l and α-naphthylphosphate inhibited the streaming even in the absence of Ca2+. On the other hand, protein phosphatase-l recovered the streaming even in the presence of Ca2+. The results indicate that characean streaming is regulated by the phosphorylation state of a regulatory and/or motile protein component. Streaming is activated when the component is dephosphorylated and inactivated when the component is phosphorylated. Ca2+ is assumed to stimulate both phosphorylation and dephosphorylation of the component. Involvement of Ca2+/calmodulin in the streaming recovery was discussed in terms of the stimulation of dephosphorylation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01276365
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    Paper (German National Licenses)
    Fulltext
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