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  • 1
    Electronic Resource
    Electronic Resource
    Effect of dietary cholecalciferol deficiency on plasma thyroid hormone concentrations in rainbow trout,Salmo gairdneri (Pisces, Salmonidae) (1980)
    Springer
    Environmental biology of fishes 5 (1980), S. 167-173 
    Details
    ISSN: 1573-5133
    Keywords: Vitamin D ; Thyroid gland ; Growth ; Endocrines ; Trout ; Calcium ; Thyroxine ; Triiodothyronine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis Diets deficient in vitamin D effected a significant increase in plasma triiodothyronine (T3) concentration in raibow trout (Salmo gairdneri); different levels of dietary calcium exerted no effect on plasma T3 levels. These effects of vitamin D deficiency on plasma T3 levels appeared to be reversible, vitamin D supplementation after a period of vitamin D deficiency lowered T3 levels. Vitamin D3, vitamin D2 and the metabolites 25(OH)-D3 and 1, 25(OH)2D3 were all effective in lowering plasma T3 levels; vitamin D3 appeared to be more effective than vitamin D2. There appeared to be a correlation between weight gain and plasma T3 concentration in the groups fed different types and levels of vitamin D supplementation suggesting that the increased T3 levels may be a compensatory increase to the reduced weight gain of the vitamin D deficient fish. Plasma T4 levels were not affected by dietary vitamin D deficiency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02391624
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  • 2
    Electronic Resource
    Electronic Resource
    Observations of the water expulsion vacoule ofPhytophthora palmivora (1989)
    Springer
    Protoplasma 149 (1989), S. 47-56 
    Details
    ISSN: 1615-6102
    Keywords: Phytophthora palmivora ; Water expulsion vacuole ; Coated vesicles ; Freeze substitution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The water expulsion vacuole ofPhytophthora palmivora was studied with the light microscope after the motility of the spores had been slowed by using a low Ca2 + medium. For transmission electron microscopy, the zoospores were prepared using freeze substitution. The water expulsion vacuole consisted of a central vacuole that collapsed and emptied its contents to the external medium. The central vacuole was surrounded by a series of interconnected vacuoles that are called the surrounding vacuole. The surrounding vacuole and the central vacuole were always associated with coated pits. The vesicles found in the region between the central and surrounding vacuole were exclusively coated vesicles. Consistent changes in the organization of the water expulsion vacuole led us to conclude that, as the central vacuole collapses, the surrounding vacuole is transformed and becomes the new central vacuole. No evidence was obtained for contraction of the central vacuole. The processes involved in membrane recycling during the functioning of the water expulsion vacuole are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01623982
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