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  • Helianthus  (1)
  • Methotrexate  (1)
  • 1980-1984  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Correlations between proton-efflux patterns and growth patterns during geotropism and phototropism in maize and sunflower (1981)
    Springer
    Planta 152 (1981), S. 239-241 
    Details
    ISSN: 1432-2048
    Keywords: Acid growth ; Geotropism ; Helianthus ; Phototropism ; Proton secretion ; Zea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract By placing seedlings of sunflower (Helianthus annuus L.) or maize (Zea mays L.) on agar plates containing a pH indicator dye it is possible to observe surface pH patterns along the growing seedling by observing color changes of the indicator dye. Using this method we find that in geotropically stimulated sunflower hypocotyls or maize coleoptiles there is enhanced proton efflux on the lower surface of the organ prior to the initiation of curvature. As curvature develops the pattern of differential acid efflux becomes more intense. A similar phenomenon is observed when these organs are exposed to unilateral illumination, i.e. enhanced acid efflux occurs on the dark side of the organ prior to the initiation of phototropic curvature and the pattern of differential acid efflux intensifies as phototropic curvature develops. These observations indicate that differential acid efflux occurs in response to tropistic stimuli and that the acid efflux pattern may mediate the development of tropistic curvatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00385150
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of anticonvulsants and methotrexate on calcium disposition (1980)
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 315 (1980), S. 63-67 
    Details
    ISSN: 1432-1912
    Keywords: Phenytoin ; Methotrexate ; Anticonvulsants ; Calcium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Administration of phenytoin for 5 days significantly reduces oral absorption and bone uptake of radiolabelled calcium in mice. Acute treatment with phenytoin had no effect on calcium disposition. Pretreatment (1–5 days) with phenobarbital also had no effect of calcium disposition. Methotrexate pretreatment for 5 days increased the bone uptake of radiolabelled calcium presumably by decreasing calcium renal clearance. It is concluded that phenytoin induced reduction in calcium metabolism is unrelated to a state of functional folate deficiency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00504231
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    Paper (German National Licenses)
    Fulltext
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