Phylogenetic Signal
Mostrando 25-36 de 147 artigos, teses e dissertações.
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25. Molecular evidences for horizontal transmission of HCV inside couples / Evidências moleculares da transmissão horizontal do vírus da hepatite C (VHC) entre cônjuges
HCV transmission has decreased with the adoption of universal blood donors screening and social policies to reduce risk of infection in IVDU, but HCV is still a worldwide health problem. The epidemiological route of infection cannot be identified in a significant proportion of patients. Some studies demonstrated the presence of viral RNA in different secreti
Publicado em: 2006
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26. Identificação, caracterização e estudo da expressão dos genes hsc70 e hsp83 em Rhynchosciara americana / Identification, characterization and study of expression of the genes hsc70 and hsp83 in Rhynchosciara americana
With the idea of identify some of these proteins involved in the folding process of the proteins synthesized on the Rhynchosciara salivary gland, this project started adopting the shotgun cDNA sequencing strategy. This cDNA library was constructed utilizing salivary glands of Rhynchosciara americana at a developmental period where the cocoon construction beg
Publicado em: 2005
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27. Acoustic evolution in crickets: need for phylogenetic study and a reappraisal of signal effectiveness
Os aparelhos estridulatórios e os chamados dos grilos são altamente estereotipados, exceto aqueles com áreas e/ou venação tegminais fortemente modificadas ou com freqüência, duração e/ou intensidade fora do ''normal''. Esta diversidade acústica ficou insuspeita até recentemente, e os modelos correntes de evolução acústica em grilos consideram e
Anais da Academia Brasileira de Ciências. Publicado em: 2004-06
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28. A growth hormone-based phylogenetic analysis of euteleostean fishes including a representative species of the Atheriniformes Order, Odontesthes argentinensis
The GH (growth hormone) cDNA sequence of the marine silverside fish Odontesthes argentinensis was obtained using the RACE protocol (Rapid Amplification of cDNA Ends). The marine silverside GH cDNA sequence is 928 nucleotides long and was found to encode a polypeptide of 204 amino acids, including a signal peptide of 17 amino acids. The 5' and 3' untranslated
Genetics and Molecular Biology. Publicado em: 2003
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29. Is autoinducer-2 a universal signal for interspecies communication: a comparative genomic and phylogenetic analysis of the synthesis and signal transduction pathways
BioMed Central.
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30. Effects of Character Weighting and Species Sampling on Phylogeny Reconstruction: A Case Study Based on DNA Sequence Data in Cetaceans
Different phylogenetic analyses of the same genetic data set can yield conflicting results, depending on the choic of parameter settings and included taxa. This is particularly true in studies involving data sets where levels of homoplasy are high and likely to obscure the phylogenetic signal. Filtering of this phylogenetic noise can be attempted, with varyi
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31. Morphometrics and hominoid phylogeny: Support for a chimpanzee–human clade and differentiation among great ape subspecies
Taxonomic and phylogenetic analyses of great apes and humans have identified two potential areas of conflict between molecular and morphological data: phylogenetic relationships among living species and differentiation of great ape subspecies. Here we address these problems by using morphometric data. Three-dimensional landmark data from the hominoid tempora
National Academy of Sciences.
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32. Accommodating natural and sexual selection in butterfly wing pattern evolution
Visual patterns in animals may serve different functions, such as attracting mates and deceiving predators. If a signal is used for multiple functions, the opportunity arises for conflict among the different functions, preventing optimization for any one visual signal. Here we investigate the hypothesis that spatial separation of different visual signal func
The Royal Society.
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33. A reevaluation of the higher taxonomy of viruses based on RNA polymerases.
In order to assess the validity of classifications of RNA viruses, published alignments and phylogenies of RNA-dependent RNA and DNA polymerase sequences were reevaluated by a Monte Carlo randomization procedure, bootstrap resampling, and phylogenetic signal analysis. Although clear relationships between some viral taxa were identified, overall the sequence
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34. Avian vocalizations and phylogenetic signal
The difficulty of separating genetic and ecological components of vocalizations has discouraged biologists from using vocal characters to reconstruct phylogenetic and ecological history. By considering the physics of vocalizations in terms of habitat structure, we predict which of five vocal characters of herons are most likely to be influenced by ecology an
The National Academy of Sciences of the USA.
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35. On the origin of the Hirudinea and the demise of the Oligochaeta.
The phylogenetic relationships of the Clitellata were investigated with a data set of published and new complete 18S rRNA gene sequences of 51 species representing 41 families. Sequences were aligned on the basis of a secondary structure model and analysed with maximum parsimony and maximum likelihood. In contrast to the latter method, parsimony did not reco
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36. Secondary Structure Analysis of a Minimal Avian Leukosis-Sarcoma Virus Packaging Signal
We previously identified a 160-nucleotide packaging signal, MΨ, from the 5′ end of the Rous sarcoma virus genome. In this study, we determine the secondary structure of MΨ by using phylogenetic analysis with computer modeling and heterologous packaging assays of point mutants. The results of the in vivo studies are in good agreement with the computer mod
American Society for Microbiology.