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  • Articles  (3)
  • pigeon erythrocyte  (2)
  • Complex life cycles  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Geographic variation and evolution in the life cycle of the witch-hazel leaf gall aphid, Hormaphis hamamelidis (1989)
    Springer
    Oecologia 78 (1989), S. 165-175 
    Details
    ISSN: 1432-1939
    Keywords: Aphids ; Complex life cycles ; Gall ; Hostalternation ; Monoecy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Two divergent life cycles associated with different elevations and latitudes have been documented for the witch-hazel leaf gall aphid, Hormaphis hamamelidis. At low elevation in northern Virginia, the aphid had seven distinct generations alternating between the primary host, witchhazel (Hamamelis virginiana), and a secondary host, river birch (Betula nigra). These findings confirm the original published life cycle description for the same locality. A second, abbreviated life cycle consisting of only three generations restricted to witch-hazel was discovered at high elevation (1000 m) in north central and northwestern Virginia. Aphids of both life cycles were sympatric at a middle elevation site. The life cycles and morphology suggest that the two forms are separate species. Although monoecious life cycles on primary hosts in aphids generally are thought to be ancestral to complex host-alternating ones, it is certainly possible that monoecious cycles are sometimes secondarily derived from complex cycles. By constructing a preliminary phylogeny of the described species in the tribe Hormaphidini, we propose that the abbreviated life cycle is derived from the complex one in the case of these witchhazel gall aphids. Our findings are discussed in the context of current theory regarding the evolutionary stability of complex life cycles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00377152
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Requirement for guanosine triphosphate in the activation of adenylate cyclase by cholera toxin (1979)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 10 (1979), S. 51-60 
    Details
    ISSN: 0091-7419
    Keywords: cholera toxin ; GTP ; pigeon erythrocyte ; adenylate cyclase ; cytosolic factor ; phosphodiesterase protein activator ; Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: The activation of adenylate cyclase in lysed pigeon erythrocytes requires, among several cofactors, a nucleotide which may be ATP, GTP, or many other triphosphates. However, after removal of endogenous nucleotides by gel filtration or by adsorption onto charcoal the requirement can be met only by GTP, or an analog of GTP. The GTP is required during the activation of the cyclase by toxin even if GTP is also included during the subsequent adenylate cyclase assay, conducted without toxin. In the presence of GTP it is possible to assay for the cytosolic protein that is also required for the action of cholera toxin. By gel filtration, its apparent molecular weight is 15,000-20,000.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jss.400100106
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  • 3
    Electronic Resource
    Electronic Resource
    Cholera toxin-catalysed ADP-ribosylation of erythrocyte proteins: General properties (1979)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 10 (1979), S. 151-163 
    Details
    ISSN: 0091-7419
    Keywords: NAD ; ADP-ribose ; poly ADP-ribose ; ADP-ribosyl protein ; cholera toxin ; adenylate cyclase ; pigeon erythrocyte ; Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Upon incubation of lysed pigeon erythrocytes with NAD, adenosine diphosphateribose (ADP-ribose) is incorporated into nuclear poly ADP-ribose and into an unidentified acid-insoluble product of the cytosol. The properties of these incorporations have been examined and a method developed for reducing their amount whilst retaining the sensitivity of the lysate to cholera toxin. This method has allowed the detection and description of a set of cholera toxin-specific ADP-ribose transfers to membrane-bound and soluble proteins under conditions that lead to adenylate cyclase activation.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jss.400100205
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