Phylogenetic Signal
Mostrando 13-24 de 147 artigos, teses e dissertações.
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13. A comparison of metrics for estimating phylogenetic signal under alternative evolutionary models
Several metrics have been developed for estimating phylogenetic signal in comparative data. These may be important both in guiding future studies on correlated evolution and for inferring broad-scale evolutionary and ecological processes (e.g., phylogenetic niche conservatism). Notwithstanding, the validity of some of these metrics is under debate, especiall
Genetics and Molecular Biology. Publicado em: 02/08/2012
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14. Evolução e ecologia de tricomas em Bignonieae (Bignoniaceae): estruturas morfológicas de defesa anti-herbivoria? / Evolution and ecology of trichomes in Bignonieae (Bignoniaceae): morphological structures of anti-herbivory defense?
This thesis focused on the evolutionary-ecology of trichomes in the tribe Bignonieae (Bignoniaceae), and in the potential defensive role of these structures against herbivores. More specifically, we characterized four trichome morphotypes found in vegetative plant parts of representatives of the Bignonieae, as well as studied the macro-evolutionary patterns
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/11/2011
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15. Caracterização e expressão do gene SERK durante a indução de embriogênese somática em soja / Characterization and expression of SERK gene during induction of somatic embryogenesis in soybean
Somatic embryogenesis is a useful tool for plant propagation and a suitable model system for deciphering early events during embryo development. Molecular and genetic studies focused in plant development have reported the involvement of SERK (Somatic Embryogenesis Receptor Kinase) gene in the acquisition of embryogenic competence. In order to increase the ef
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/09/2010
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16. Sequence variability of COI in Sigmodontine rodents highlights the taxonomic bottleneck
Sigmodontinae is a high diverse rodent subfamily with difficult taxonomic identification, which plays a relevant role in environmental impact assessment and public health. We evaluated cytochrome c oxidase subunit I (COX-I) sequence variability in order to investigate the existence of ‘barcoding gap’ and to assess its phylogenetic potential in evolutiona
Publicado em: 2010
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17. Molecular cloning and expression patterns of the Vasa gene from Rana nigromaculata (Amphibia: Anura)
The Vasa protein is a member of the DEAD (Asp-Glu-Alu-Asp) box family of ATP-dependent RNA helicases. The Vasa gene is specifically expressed in germ-line cells of many metazoans and is known to play a critical role in gametogenesis and reproductive regulation. In this paper, we isolate the full length cDNA sequence of the Vasa gene from the frog Rana nigrom
Zoologia (Curitiba). Publicado em: 2009-06
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18. Evolution of genetic diversity : decoupling factors that influence species genetic diversity / Evolução da variabilidade genetica : separando os fatores que determinam a variabilidade das especies
The amount of genetic variability on species can be influenced by factors acting in different levels of biological organization, and the ones related to population dynamics have been extensively studied. However, past studies neglected the influence of evolutionary history on genetic variability. We studied for the first time the influence of evolutionary hi
Publicado em: 2009
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19. Macroecology of the genus Uca (Crustacea, Decapoda): patterns of diversity, distribution and responses to global climate change / Macroecologia do gênero Uca (Crustacea, Decapoda): padrões de diversidade, distribuição e respostas às mudanças climáticas globais
Macroecology of the genus Uca (Crustacea, Decapoda): Patterns of diversity, distribution and responses to global change. The genus Uca, composed by 97 species, has a worldwide distribution on coastal marine regions, mainly in tropical environments. Many researches have used the genus Uca as a model of study, although the actual scientific knowledge about thi
Publicado em: 2009
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20. Relações filogenéticas de rodentia: uma abordagem comportamental / A behavioral approach to the phylogeny of Rodentia
The phylogenetical relationships within Rodentia are complex, and the position of Hystricognathi differs when estimated through different kinds of data (morphology or DNA). This paper focuses on a still different kind of data: we estimate the phylogeny of the group through behavioral characters. We obtained probabilistic grooming sequences with the program E
Publicado em: 2009
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21. Estudos de citogenética e de filogenia molecular em roedores da tribo Akodontini / Cytogenetics and molecular phylogenetics in rodents of the tribe Akodontini
Traditionally comparative cytogenetic studies are based mainly on banding patterns. Nevertheless, when dealing with species with highly rearranged genomes, as in Akodon species, or with other highly divergent species, cytogenetic comparisons of banding patterns prove to be inadequate. Hence, comparative chromosome painting has become the method of choice for
Publicado em: 2009
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22. Development of a database for classification and analysis of type IV secretion systems / Desenvolvimento de um banco de dados para classificação e análise de sistemas de secreção do tipo IV bacteriano
The type IV secretion system can be classified as a large family of macromolecule transporters divided in three recognized sub-families involved in different bacterial functions. The major sub-family of T4SS is the conjugation system, which allows transfer of genetic material as a nucleoprotein via cell contact among bacteria. Analogously to bacterial conjug
Publicado em: 2008
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23. Molecular systematics and wing morphometric variation in species of the Drosophila tripunctata radiation / Sistematica molecular e variação morfometrica da asa de especies de Drosophila da radiação tripunctata
The tripunctata group is the second largest Neotropical group of Drosophila in number of species and was included in the tripunctata radiation which comprises other closely related groups. The second chromosome of Drosophila mediopunctata (a species that belongs to the tripunctata group) is highly polymorphic for inversions. Previous work suggested the pr
Publicado em: 2007
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24. A mitochondrial metazoan phylogeny / Uma filogenia mitocondrial de metazoários
Inferring the evolutive relations between the animal phyla has been a formidable challenge to Science. The animal phyla represent quite distinct baupläne (body architectures) and are, therefore, difficult to compare. At the same time, their fossil record converges mostly to the same period on the geological scale. The recent availability of molecular data h
Publicado em: 2007