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  • 1990-1994  (2)
  • 1
    Electronic Resource
    Electronic Resource
    The role of cysts on population dynamics of Scrippsiella spp. (Dinophyceae) in Onagawa Bay, northeast Japan (1994)
    Springer
    Marine biology 119 (1994), S. 39-44 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The seasonal behavior of both vegetative cells and cysts of dinophytes Scrippsiella spp., mostly S. trochoidea, which is the dominant group among dinoflagellate populations in Onagawa Bay on the northeastern coast of Honshu, Japan, was investigated between 1990 and 1992. The germination of the cysts after 8 d incubation under favorable laboratory conditions was examined using the extinction dilution method. Incessant germination occurred throughout the year, but the germination ratio (no. of germinable cysts/total cysts) varied seasonally with a marked fluctuation during summer when vegetative cells in the water column were abundant. Although such fluctuation largely reflects the variable flux of newly deposited immature cysts produced by the vegetative cells, the regulation of germination caused by a lowered saturation of dissolved oxygen (DO) under thermally stratified conditions was also suggested. During winter, while the cysts germinated in the laboratory, vegetative cells were not found in the water column. These facts suggest that germination in situ is regulated by low temperature in winter and possibly by lowered DO and by cyst age as well in summer. Such regulation prevents simultaneous germination of all the cysts, which is disadvantageous for the population because it would be more difficult to survive adverse conditions such as successive nutrient depletion and higher grazing risk.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00350104
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    New organosols of nickel sulfides, palladium sulfides, manganese sulfide, and mixed metal sulfides and their use in preparation of semiconducting polymer-metal sulfide composites (1991)
    Springer
    Colloid & polymer science 269 (1991), S. 969-971 
    Details
    ISSN: 1435-1536
    Keywords: Organosol ; nickel sulfide ; palladium sulfide ; manganese sulfide ; mixed sulfide
    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 NiS, PdS, and MnS in N,N-dimethylformamide were prepared by reaction of the metal acetate with H2S. Organosols of mixed-metal sulfides (Zn x Cd1−x S, Hg x Cd1−x S, Hg x Cu1−x S, Cd x Mn1−x S, Hg x Mn1−x S, Hg x Cd1−x S, and Mn x Zn1−x S) were similarly obtained by reaction of mixtures of the metal salts with H2S. The organosol of Zn0.5Cd0.5S contained particle with two particle size distributions centered at 6.5 nm and 29 nm, as revealed by Ar laser-scattering analysis. The metal sulfides are recovered by addition of Et2O to the organosols. Zn x Cd1−x S thus obtained shows magnetic susceptibility in the range 0.5×10−6–2.3×10−6 emug−1 depending on thex value. Addition of polymers to the organosols affords semiconducting films of metal sulfide-polymer composites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00657425
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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