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  • 1990-1994  (1)
  • 1980-1984  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 37 (1981), S. 93-94 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Two types of yolk develop in the oocyte ofChanna punctatus. The carbohydrate yolk, which develops from the material present in the ooplasm, breaks up for the use of the growing oocyte before ovulation takes place. The proteid yolk, developing from the extraoocytic material, finally crams the fully mature oocyte, perhaps to participate in the process of embryogenesis.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Natural resources research 2 (1993), S. 156-166 
    ISSN: 1573-8981
    Keywords: Fluid-melt inclusions ; Homogeneous pegmatites ; Heterogeneous pegmatites ; Homogenization temperature ; Salinity ; Bihar, India
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Fluid inclusions and melt inclusions have been considered as possible guides for mineral exploration by many researchers. However, the minuteness of the fluid inclusions and the multiplicity of generations within the same deposit have always posed serious problems in the proper utilization of fluid-inclusion data in prospecting. Fluid inclusions preserve a valid and comprehensive record of the fluids coexisting with host minerals at the time of crystallization. A careful comparison of fluid-inclusion parameters and deposit characteristics enables one to distinguish between economically significant and insignificant zones of pegmatites. A systematic study of different pegmatites in an area of about 100 km2 in the central part of the Bihar Mica Belt, India, was made. Mineralogical, fluid-inclusion, and melt-inclusion data of the principal mineral constituents like quartz, beryl, and apatite were collected. Thirty-three occurrences were chosen for the study. Pegmatites were grouped into economically significant (commercial) and barren (noncommercial) types. The fluid-inclusion parameters used in this study are size, population, presence of liquid carbon dioxide, salinity, and temperature of homogenization. Economically significant pegmatites and barren pegmatites have distinctly different populations of fluid inclusions. Economic pegmatites show a preponderance of highly saline, polyphase fluid inclusions, commonly with liquid carbon dioxide; these fluid inclusions homogenize over a wide range of temperature. Their size ranges from 50 μm to 10 μm. On the other hand, quartz of barren pegmatites is characterized by the preponderance of vapor-rich biphase inclusions, which homogenize at a relatively narrower but higher range of temperature. Fluid inclusions that contain halite daughter crystals are rare. The average size of the fluid inclusions in barren pegmatites is smaller (5 μm to 20 μm). Melt inclusions are more abundant in the barren pegmatites.
    Type of Medium: Electronic Resource
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