Ancestral States
Mostrando 1-12 de 21 artigos, teses e dissertações.
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1. Evolutionary study of potentially zoonotic hepatitis E virus genotype 3 from swine in Northeast Brazil
Hepatitis E virus (HEV), an emerging virus associated with acute hepatic disease, leads to thousands of deaths worldwide. HEV has already been reported in Brazil; however, there is a lack of epidemiological and molecular information on the genetic variability, taxonomy, and evolution of HEV. It is thus unclear whether hepatitis E is a neglected disease in Br
Mem. Inst. Oswaldo Cruz. Publicado em: 03/06/2019
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2. Filogenia e biogeografia das espécies de actinote hübner, 1819 (Nymphalidae : Heliconinae) / Phylogeny and biogeography of species of actinote hübner, 1819 (Nymphalidae : Heliconinae)
Many aspects and details of the origin, evolution and biogeographical patterns of butterflies are not yet fully comprehended. The phylogenetic relationships among most butterfly groups remained unknown until recently. Phylogenetic studies have been based mainly on morphological characters of adults, although characters of immature stages had increased in use
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/02/2012
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3. Filogenia e biogeografia do complexo Croton pallidulus(Euphorbiaceae), inferidas por sequências de DNA e marcadores AFLP / Phylogeny and biogeography of complex Croton pallidulus (Euphorbiaceae), inferred by DNA sequences and AFLP markers
The project addressed the detection of genetic polymorphisms in a Complex formed by some species of widespread occurrence in southeast of Brazil, whose limits are not yet well established, by presenting great morphological polymorphism that raises doubts as to whether it is a single or various species. The following species were studied: C. ceanothifolius, C
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/12/2011
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4. Análise populacional de Melipona marginata (Hymenoptera, Apidae, Meliponini) por meio de RFLP do DNA mitocondrial e microssatélites / Population analysis of Melipona marginata (Hymenoptera, Apidae, Meliponini) by RFLP of DNA mitochondrial and microsatellites
The tribe Meliponini (stingless bees) is present in all tropical regions of the world and has an important role in pollination. The genus Melipona has the highest number of species in the tribe. The specie Melipona marginata is considered the most ancestral within the genus, and like other species builds the nests in hollow of trees. Unfortunately several be
Publicado em: 2009
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5. PHYLOGENETICS AND MORPHOLOGICAL EVOLUTION OF SCLERACTINIAN CORALS
Scleractinian corals are modular organisms of great ecological and economic importance that may have solitary or colonial growth forms. In spite of the rich fossil record, the evolutionary history of the group is poorly understood and its taxonomy is highly artificial because many of the features commonly employed in systematic studies of the group exhibit l
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/11/2007
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6. Evolutionary studies of the divisome, a multiprotein complex responsible for bacterial division / Estudos evolutivos do divisomo, um complexo multiprotéico responsável pela divisão bacteriana
O mecanismo de divisão mais comum entre procariotos é a divisão binária, na qual a célula- mãe reparte seu genoma e conteúdo citoplasmático de forma igual entre duas células filhas. Esse processo é mediado por um complexo protéico especializado, chamado divisoma, composto por cerca de 20 proteínas, que promovem a constrição da parede celular e
Publicado em: 2007
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7. Vestigial preference functions in neural networks and túngara frogs.
Although there is a growing interest in understanding how perceptual mechanisms influence behavioral evolution, few studies have addressed how perception itself is shaped by evolutionary forces. We used a combination of artificial neural network models and behavioral experiments to investigate how evolutionary history influenced the perceptual processes used
The National Academy of Sciences.
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8. A New Method of Inference of Ancestral Nucleotide and Amino Acid Sequences
A statistical method was developed for reconstructing the nucleotide or amino acid sequences of extinct ancestors, given the phylogeny and sequences of the extant species. A model of nucleotide or amino acid substitution was employed to analyze data of the present-day sequences, and maximum likelihood estimates of parameters such as branch lengths were used
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9. The Phylogenetic Relationships of the Members of the DROSOPHILA ROBUSTA Group
The phylogenetic relationships among the species of the D. robusta group were investigated by the analysis of chromosomal differences. Six of the ten known members of the D. robusta group were available for the study: D. colorata and D. robusta from the United States, and D. sordidula, D. pseudosordidula, D. lacertosa, and D. moriwakii from Japan. Analysis o
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10. Molecular Analysis by Pulsed-Field Gel Electrophoresis and Antibiogram of Streptococcus pneumoniae Serotype 6B Isolates from Selected Areas within the United States
Fifty-eight clinical isolates of Streptococcus pneumoniae serotype 6B, including 16 from Alaska, 14 from Arizona, 11 from Washington, and 17 from seven additional states, were analyzed. The antibiograms of these isolates were assigned to 10 antibiotic profiles based on their susceptibilities to penicillin, erythromycin, tetracycline, and trimethoprim-sulfame
American Society for Microbiology.
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11. Panglobal distribution of a single clonal lineage of the Irish potato famine fungus.
More than 300 isolates of the Irish potato famine fungus, Phytophthora infestans, collected in 20 countries on five continents, were analyzed for genetic variation at the mating type and two allozyme loci. A subset of more than 200 isolates was also analyzed for DNA "fingerprint" variation. A surprising result was that a single clonal lineage dominated most
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12. Punctuated equilibrium and positive Darwinian evolution in vesicular stomatitis virus.
RNA viruses possess the potential for rapid evolution and serve as excellent models to test evolutionary theory. Molecular phylogenetic analysis of the P gene for a larger number of diverse natural isolates of vesicular stomatitis virus reveals no evidence for a molecular clock but instead shows a stepwise evolutionary pattern unlike that ever seen before. E