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  • 1975-1979  (6)
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Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Variations du taux d'acide ascorbique au cours du développement de l'ovaire et du cycle d'intermue chez Palaemon serratus (Crustacea: Decapoda) (1975)
    Springer
    Marine biology 32 (1975), S. 349-355 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Variations in ascorbic acid content of the ovary, somatic tissues and the whole female body were studied during ovarian development and the molting cycle of Palaemon serratus. The conclusions are incomplete, due to insufficient data on the role of ascorbic acid in the physiology and metabolism of animals, and especially crustaceans. However, some results indicate that Vitamin C is accumulated in the female as the gonad index increases. Ascorbic acid is concentrated preferentially in the ovarian tissue. Some hypotheses are put forward relating to the role of ascorbic acid in the biosynthesis of chitin, steroid hormones, and in ovarian maturation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00388992
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Variation in lipid classes during the molting cycle of the prawn Penaeus japonicus (1977)
    Springer
    Marine biology 39 (1977), S. 129-136 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The variation in the concentration and fatty acid composition of lipid classes during the molting cycle of the prawn Penaeus japonicus was investigated. The lipid concentration of the whole body reached a maximum at mid-premolt (Stage D2) and then decreased to low level at late premolt (Stage D3–4). The accumulation of lipids during the premolt period seemed to be attributable to the increase of both polar and neutral lipids. The increase of neutral lipids at Stage D2 was derived from not only triglycerides but also free sterols and free fatty acids. Regarding the fatty acid composition of every lipid class, a marked variation occurred mainly at the intermolt (Stage C). In this stage, the polar lipids were rich in monoenoic acids such as 18:1 and poor in polyenoic acids such as 20:5ω3 and 22:6ω3. The triglycerides were rich in polyenoic acids at Stage C, but poor in monoenoic acids such as 16:1 and 18:1. The steryl esters contained large amounts of saturated acids such as 16:0 and 18:0 throughout the molting cycle, however the level of polyenoic acids increased at Stage C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00386998
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Studies on the nutritional requirements of the larval stages of Penaeus japonicus using microencapsulated diets (1979)
    Springer
    Marine biology 54 (1979), S. 261-267 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Fatty acid biosynthesis in the larval stages of Penaeus japonicus Bate was examined by feeding microencapsulated diets containing (1-14C) palmitic acid, and fat-free diets supplemented with defined fatty acids. Highest larval growth rates were achieved on diets containing Tapes philippinarum lipid and, when defined fatty acids were substituted, on diets containing 20:6ω3 fatty acid. The radioactive tracer experiments indicate that 16:1ω7, 18:0 and 18:1ω9 fatty acids may be synthesised from palmitic acid and that P. japonicus larvae may possess the ability to elongate 18:3ω3 to 20:5ω3 and 22:6ω3, and 18:2ω6 to 20:4ω6. However, the rates of these reactions appear to be too slow to meet the larval requirements for essential fatty acids and the ω3 series of polyunsaturated fatty acids must be provided in the diet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00395788
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Sterol components of coral-reef molluscs (1979)
    Springer
    Marine biology 50 (1979), S. 169-173 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The sterol composition of 23 species of coral-reef molluscs from Tahiti was investigated in relation to habitat and taxonomy. The elucidation of sterol components was performed by both argentation column and gas-liquid chromatographic techniques. Coral-reef molluscs, especially gastropods, seem to be characterised by sterols rich in 24-methylcholesterol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00397823
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Sterols in coral-reef animals (1976)
    Springer
    Marine biology 34 (1976), S. 53-57 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The sterol constituents of both coral and non-coral-reef animals (mollusks, coelenterates, echinoderms) have been investigated, and determined by gas-liquid chromatography and spectral analyses. All coral-reef animals examined contained larger amounts of C28-sterols, such as 24-methylcholesterol, than non-coral-reef animals. The seastar Acanthaster planci contains the same sterol constituents as some coral-reef coelenterates and mollusks, differing only in the position of the double bond in a steroid ring. This observation suggests the transport of dietary Δ5-sterols to Δ7-sterols through the food-chain in A. planci.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00390787
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Sedimentary record of fecal pollution in part of lake constance by coprostanol determination (1979)
    Springer
    Naturwissenschaften 66 (1979), S. 520-522 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00404867
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    Paper (German National Licenses)
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