Hedges
Mostrando 25-36 de 50 artigos, teses e dissertações.
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25. A genomic timescale for the origin of eukaryotes
BioMed Central.
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26. Comparison of mode estimation methods and application in molecular clock analysis
BioMed Central.
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27. A molecular timescale of eukaryote evolution and the rise of complex multicellular life
BioMed Central.
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28. Resistance to Arsenic Compounds Conferred by a Plasmid Transmissible Between Strains of Escherichia coli
A plasmid, R773, which confers resistance to arsenic compounds, is transmissible between strains of Escherichia coli. It is a member of compatibility group F1.
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29. R Plasmids from Asian Strains of Vibrio cholerae
Five R plasmids transferred from Asian strains of Vibrio cholerae all proved to be members of compatibility group C. A non-self-transmissible plasmid, stable in V. cholerae, was mobilized for transfer to Escherichia coli K-12 and found to be unstably inherited in that host. Plasmids of group C and P transferred to a wild V. cholerae strain were stably inheri
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30. Ross' syndrome (tonic pupil plus).
Two cases of tonic pupil, hyporeflexia, and segmental hypohidrosis (Ross' syndrome) are reported. The relationship of this syndrome to other autonomic dysfunction is discussed. Those symptoms (emotional instability, loss of sweating, orthostatic hypotensive symptoms, and signs of bilaterality of the tonic pupil) which should alert the clinician to more exten
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31. Caribbean biogeography: molecular evidence for dispersal in West Indian terrestrial vertebrates.
The geological association of the Greater Antilles with North and South America in the late Cretaceous led to the hypothesis that the present Antillean biota reflects those ancient land connections. Molecular data from diverse West Indian amphibians and reptiles and their mainland relatives support a more recent derivation of the Antillean vertebrate fauna b
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32. Incompatibility Groups and the Classification of fi− Resistance Factors
Incompatibility between R factors has been reported by several authors, and four incompatibility groups have already been described by Datta and Hedges among Rfi− factors. The stability of 12 plasmids in pairs was studied after 116 crosses, and five new groups were found, designated 5, 6, 7, 8, and 9. Each plasmid studied belongs to one single group. Incom
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33. Molecular evidence for the origin of birds.
The major groups of amniote vertebrates appeared during a relatively short time span at the end of the Paleozoic Era, a fact that has caused difficulty in estimating their relationships. The fossil record suggests that crocodilians are the closest living relatives of birds. However, morphological characters and molecular sequence data from living amniotes ha
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34. Analytical isoelectric focusing of R factor-determined beta-lactamases: correlation with plasmid compatibility.
R factor-determined beta-lactamases have been investigated by analytical isoelectric focusing. The enzymes such as those specified by the R6K and RP4 plasmids (TEM-type enzymes) are notably homogenous in biochemical tests (Hedges et al., 1974), but two subclasses can be distinguished by isoelectric focusing. Three subclasses can be distinguished among the ox
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35. Molecular Specificities of R Factor-Determined Beta-Lactamases: Correlation with Plasmid Compatibility
Beta (β)-lactamases determined by 29 ampicillin resistance plasmids could be divided into two types. One, TEM-type, was very uniform with respect to substrate specificity but heterogeneous in absolute levels of β-lactamase activity. The TEM-type β-lactamase was determined by R factors of compatibility groups FII, Iα, Iε, N, C, A, T, W, P, L, and X, and
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36. Genetic and biochemical properties of AER-1, a novel carbenicillin-hydrolyzing beta-lactamase from Aeromonas hydrophila.
A novel carbenicillin-hydrolyzing beta-lactamase has been discovered in a blood isolate of Aeromonas hydrophila. The enzyme resembles plasmid-determined carbenicillinases in substrate profile but differs in isoelectric point (pI 5.9) and molecular weight (22,000) and has been termed AER-1. No evidence for a plasmid location could be obtained in A. hydrophila