Jefrey D. Palmer

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Small subunit rRNA sequence data were generated for 27 strains of cyanobacteria and incorporated into a phylogenetic analysis of 1,377 aligned sequence positions from a diverse sampling of 53 cyanobacteria and 10 photosynthetic plastids. Tree inference was carried out using a maximum likelihood method with correction for site-to-site variation in(More)
Phylogenetic relationships among the five groups of extant seed plants are presently quite unclear. For example, morphological studies consistently identify the Gnetales as the extant sister group to angiosperms (the so-called "anthophyte" hypothesis), whereas a number of molecular studies recover gymnosperm monophyly, and few agree with the(More)
Chloroplast DNA was purified from 12 accessions that represent most of the species diversity in the genus Lycopersicon (family Solanaceae) and from 3 closely related species in the genus Solanum. Fragment patterns produced by digestion of these DNAs with 25 different restriction endonucleases were analyzed by agarose gel electrophoresis. In all 15 DNAs, a(More)
Chloroplast genomes of Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] and radiata (Monterey) pine [Pinus radiata D. Don], two conifers from the widespread Pinaceae, were mapped and their genomes were compared to other land plants. Douglas-fir and radiata pine lack the large (20-25 kilobases) inverted repeat that characterizes most land plants. To our(More)
A widely held view of land plant relationships places liverworts as the first branch of the land plant tree, whereas some molecular analyses and a cladistic study of morphological characters indicate that hornworts are the earliest land plants. To help resolve this conflict, we used parsimony and likelihood methods to analyze a 6, 095-character data set(More)
We examined the arrangement of sequences common to seven angiosperm chloroplast genomes. The chloroplast DNAs of spinach, petunia and cucumber are essentially colinear. They share with the corn chloroplast genome a large inversion of approximately 50 kb relative to the genomes of three legumes--mung bean, pea and broad bean. There is one additional(More)
THE false-truffles (Hymenogastrales) are a group of basidomycetous fungi that produce underground truffle-like basidiocarps. They are generally believed to be independently derived from several mushroom lineages, but extensive morphological divergence often obscures recognition of these phylogenetic connections. Comparisons of mitochondrial DNA now(More)
Variation in 30 chloroplast DNAs, representing 22 wild and cultivated accessions in the genus Pisum, was analyzed by comparing fragment patterns produced by 16 restriction endonucleases. Three types of mutations were detected. First, an inversion of between 2.2 kilobase pairs (kb) and 5.2 kb distinguished a population of P. humile from all other Pisum(More)
We have carried out a prospective study of selective peripheral denervation (SPD) in cervical dystonia (CD) patients with primary or secondary botulinum toxin (BT) treatment failure using independent standardized assessment. Patients referred for surgery had a standardized clinical examination, neck muscle EMG, videofluoroscopic swallow and CT of the(More)