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  • Collective effects  (1)
  • Daucus carota L.  (1)
  • cell envelope  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Localization and correlation effects on the magnetoresistance of a degenerate electron gas in InAs below the quantum limit (1996)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 18 (1996), S. 753-761 
    Details
    ISSN: 0392-6737
    Keywords: Collective effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Measurements of the resistivity tensor of a range of moderately dopedn-InAs samples were carried out at low temperatures in the ionized impurity scattering regime. Analyses were performed while the electron gas was in a degenerate state and below the quantum limit. The temperature and the magnetic-field dependences of the two components of the resistivity tensor, ϱ‖ (longitudinal) and ϱ⊥ (transverse), were discussed in terms of localization and correlation effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457362
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The cytokinins of cultured carrot cells (1979)
    Springer
    Protoplasma 101 (1979), S. 103-109 
    Details
    ISSN: 1615-6102
    Keywords: Cytokinins ; Daucus carota L. ; Plant tissue culture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Cytokinin-autotrophic strains of carrot callus contained active substances with Chromatographic mobilities on Sephadex LH-20 corresponding to 6-(4-hydroxy-3-methylbut-trans-2-enylamino)purine (Zeatin, Z), 6-(3-methylbut-2-enylamino)purine (iP) and the ribosides (9R)Z and (9R)iP. The apparent major activity was found in a fraction, with an elution volume of 242–291 ml. Hydrolysis of this fraction with HCl and Β-Glucosidase gave rise to Z, indicating that the major active compound is a polar conjugate of Zeatin. In all experiments the extracts were tested immediately after preparation; deep freeze storage, led to a considerable loss of activity in polar fractions. while the free base cytokinins and their ribosides showed increased activity levels. Analogous results were obtained by means of paper chromatography.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01293439
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Acid stress and lake bacteria: Ultrastructural and physiological correlates of some acid and copper stresses (1988)
    Springer
    Hydrobiologia 160 (1988), S. 241-247 
    Details
    ISSN: 1573-5117
    Keywords: acid stress ; bacteria ; biodegradation ; cell envelope ; copper stress ; ultrastructural/physiological correlates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A description is given of concurrent changes in bacterial ultrastructure and physiology in relation to applied stresses of acid and/or copper: the environmentally-relevant correlations are explored as a potential tool for ascertaining mechanisms of acid rain damage. Ultrastructural analysis permits a differentiation, on a gross scale, between different levels of acid and combined acid/copper stresses in laboratory experiments on enrichment cultures of lacustrine microbial populations rich in Gram-negative bacteria. For the dominant morphotypes of Gram-negative bacteria, changes in the cell envelope (and its extensions) correlate also with changes in activity of envelope-associated enzymes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00007138
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    Paper (German National Licenses)
    Fulltext
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