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  • 1
    Electronic Resource
    Electronic Resource
    Lefschetz Motives and the Tate Conjecture (1999)
    Springer
    Compositio mathematica 117 (1999), S. 47-81 
    Details
    ISSN: 1570-5846
    Keywords: Abelian varieties ; Tate conjecture ; motives.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract A Lefschetz class on a smooth projective variety is an element of the Q-algebra generated by divisor classes. We show that it is possible to define Q-linear Tannakian categories of abelian motives using the Lefschetz classes as correspondences, and we compute the fundamental groups of the categories. As an application, we prove that the Hodge conjecture for complex abelian varieties of CM-type implies the Tate conjecture for all Abelian varieties over finite fields, thereby reducing the latter to a problem in complex analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1000776613765
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  • 2
    Electronic Resource
    Electronic Resource
    The importance of non-pollen plant parts as food sources for the common blossom thrips, Frankliniella schultzei (1996)
    Springer
    Entomologia experimentalis et applicata 78 (1996), S. 271-281 
    Details
    ISSN: 1570-7458
    Keywords: Frankliniella schultzei ; Thysanoptera ; Insecta ; pollen-feeding ; petal-feeding ; development ; fecundity ; Malvaviscus arboreus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Like other flower thrips, Frankliniella schultzei Trybom (Thysanoptera: Thripidae) feeds on pollen. However, the influence of a pollen diet on the life history of F. schultzei may not be as significant as reported for other thrips species. Frankliniella schultzei was reared successfully and with low mortalities (≤20%) on Wax Mallow, (Malvaviscus arboreus Cav.) plant part diets. Development times and fecundity on a petal diet were not significantly different from that on a pollen diet. Fecundity on a diet combining M. arboreus pollen, petal and leaf tissues was significantly higher than those individually containing these tissues. In laboratory choice tests, F. schultzei females encountered petal most often of the three plant parts. Pollen and leaf were encountered with similar frequencies. A significantly higher proportion of petal encounters (0.8) resulted in feeding than did pollen encounters (0.5). Few leaf encounters (0.1) were followed by feeding. Adult and larval F. schultzei were found in M. arboreus flowers but not on leaves. All parts of the flower were inhabited and not just the pollen-bearing petal apices and anthers. We propose that feeding on pollen within M. arboreus flowers is just one of many influences on the life history of F. schultzei and suggest that this may extend to other thrips species/host-plant combinations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00193446
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    Paper (German National Licenses)
    Fulltext
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