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SUMMARY:Phylogenetic trees and k-dissimilarity maps - Herrmann\, S (East A
 nglia)
DTSTART:20110621T143000Z
DTEND:20110621T145000Z
UID:TALK31812@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Phylogenetic trees are versatile tools in the analysis of sequ
 ence data. Several approaches exist to construct such trees from data usin
 g metrics or distances\, and the Tree Metric Theorem of Dress gives an exp
 licit condition when such a metric defines a tree. More recently\, (see\, 
 e.g.\, Levy\, Yoshida and Pachter [Mol. Biol. Evol. 23(3):491498. 2006])\,
  it was suggested to use the phylogenetic diversity not of pairs\, but of 
 triplets\, quartets or\, in general\, k-tuples\, to construct trees from t
 he given data. Maps assigning values to such k-tuples of taxa as opposed t
 o pairs are called k-dissimilarity maps. \n\nIn this talk\, we will analys
 e when such k-dissimilarity maps correspond to trees and give generalisati
 ons of the Tree Metric Theorem. \n\nThis is joint works with Katharina Hub
 er\, Vincent Moulton and Andreas Spillner.\n
LOCATION:Seminar Room 1\, Newton Institute
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