Results 251 to 260 of about 397,970 (301)
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MAJOR CLADES OF THE ANGIOSPERMS
Cladistics, 1985Abstract— Our knowledge of fundamental angiosperm interrelationships is still very incomplete. The absence of a narrowly circumscribed gymnosperm outgroup, ideally the sister group, makes character evaluation, necessary for a cladistic analysis, difficult.
Rolf, Dahlgren, Kåre, Bremer
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Biological Theory, 2006
Exploring whether clades can reproduce leads to new perspectives on general accounts of biological development and individuation. Here we apply James Griesemer’s general account of reproduction to clades. Griesemer’s account of reproduction includes a requirement for development, raising the question of whether clades may be meaningfully said to ...
Andrew Hamilton, Matthew H. Haber
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Exploring whether clades can reproduce leads to new perspectives on general accounts of biological development and individuation. Here we apply James Griesemer’s general account of reproduction to clades. Griesemer’s account of reproduction includes a requirement for development, raising the question of whether clades may be meaningfully said to ...
Andrew Hamilton, Matthew H. Haber
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Cross-Clade CD8+ T-Cell Responses With a Preference for the Predominant Circulating Clade
JAIDS Journal of Acquired Immune Deficiency Syndromes, 2005Human immunodeficiency virus (HIV) genetic diversity is a major impediment to the design of a successful vaccine. Even if an HIV vaccine is proven effective, it remains to be seen whether this protection will extend to inter-clade, intra-clade, and recombinant strains. We used recombinant vaccinia-based interferon gamma (IFN) Elispot assays to test the
McKinnon, LR +8 more
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Health Security, 2019
Clade X was a day-long pandemic tabletop exercise conducted by the Johns Hopkins Center for Health Security on May 15, 2018, in Washington, DC. In this report, we briefly describe the exercise development process and focus principally on the findings and recommendations that arose from this project.
Crystal, Watson +11 more
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Clade X was a day-long pandemic tabletop exercise conducted by the Johns Hopkins Center for Health Security on May 15, 2018, in Washington, DC. In this report, we briefly describe the exercise development process and focus principally on the findings and recommendations that arose from this project.
Crystal, Watson +11 more
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Molecular Evidence for a Clade of Turtles
Molecular Phylogenetics and Evolution, 1999Although turtles have been generally grouped with the most primitive reptile species, the origin and phylogenetic relationships of turtles have remained unresolved to date. To confirm the phylogenetic position of turtles in amniotes, we have cloned and determined the cDNA sequences encoding for skink lactate dehydrogenase (LDH)-A and LDH-B, snake LDH-A,
H, Mannen, S S, Li
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Clade support measures and their adequacy
Cladistics, 2008AbstractIn addition to hypothesis optimality, the evaluation of clade (group, edge, split, node) support is an important aspect of phylogenetic analysis. Here we clarify the logical relationship between support and optimality and formulate adequacy conditions for support measures. Support, S, and optimality, O, are both empirical knowledge claims about
Taran, Grant, Arnold G, Kluge
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Natural clades differ from “random” clades: simulations and analyses
Paleobiology, 1981Using computer simulations and analytic calculations, we have evaluated whether conspicuous expansions and contractions of natural clades may have represented chance fluctuations that occurred while probabilities of speciation and extinction remained equal and constant.
Steven M. Stanley +3 more
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Origin of arthropods and of the clades of Ecdysozoa
Russian Journal of Developmental Biology, 2013The problem of the origin of the phylum Arthropoda was long considered solved based on evolutionary morphology data. But molecular biological studies of recent years have put forward a new solution that contradicts the old one. Hence, the need arises to review the argumentation of both sides and search for ways to reach a consensus.
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