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| Registros recuperados: 383 | |
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| Liliana Dávalos. |
| Although the natural history of the Caribbean is better understood now than ever before, a general biogeographic explanation for the peculiar faunal composition of the islands remains elusive. New molecular phylogenetic and divergence analyses presented here show that dispersal and diversification in Caribbean bats are synchronous with sea level drops during inter-stage transitions in the Miocene. The phylogenies indicate that several continental bat species descended from West Indian ancestors, as the exceptionally low sea level of the Miocene transitions allowed for two-way biotic exchange between the islands and the continent. These results suggest a common mechanism underlies colonization and subsequent speciation in the Caribbean, and underscore the... |
| Tipo: Manuscript |
Palavras-chave: Earth & Environment; Evolutionary Biology. |
| Ano: 2009 |
URL: http://precedings.nature.com/documents/3901/version/1 |
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| Carlos Perales-Gravan; Javier de Vicente Buendia; Rafael Lahoz-Beltra. |
| At present, all methods in Evolutionary Computation are bioinspired in the fundamental principles of neo-Darwinism as well as on a vertical gene transfer. Thus, on a mechanism in which an organism receives genetic material from its ancestor. Horizontal, lateral or cross-population gene transfer is any process in which an organism transfers a genetic segment to another one that is not its offspring. Virus transduction is one of the key mechanisms of horizontal gene propagation in microorganism (e.g. bacteria). In the present paper, we model and simulate a transduction operator, exploring a possible role and usefulness of transduction in a genetic algorithm. The genetic algorithm including transduction has been named PETRI (abbreviation of Promoting... |
| Tipo: Manuscript |
Palavras-chave: Microbiology; Bioinformatics; Evolutionary Biology. |
| Ano: 2009 |
URL: http://precedings.nature.com/documents/3732/version/1 |
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| Michael E. Baker. |
| 11[beta]-hydroxysteroid dehydrogenase type-2 (11[beta]-HSD2) regulates the local concentration of cortisol that can activate the glucocorticoid receptor and mineralocorticoid receptor, as well as the concentration of 11-keto-testosterone, the active androgen in fish. Similarly, 17[beta]-HSD2 regulates the levels of testosterone and estradiol that activate the androgen receptor and estrogen receptor, respectively. Interestingly, although human 11[beta]-HSD2 and 17[beta]-HSD2 act at different positions on different steroids, these enzymes are paralogs. Despite the physiological importance of 11[beta]-HSD2 and 17[beta]-HSD2, details of their origins and divergence from a common ancestor are not known. An opportunity to understand their evolution is... |
| Tipo: Manuscript |
Palavras-chave: Cancer; Developmental Biology; Pharmacology; Bioinformatics; Evolutionary Biology. |
| Ano: 2010 |
URL: http://precedings.nature.com/documents/4649/version/1 |
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| Daniel Z. Bar. |
| The horizontal transfer of DNA between different organisms is a major force shaping the genomes of prokaryotes, but is considered to have a minor role in eukaryotes, with only a handful of known examples, mostly of limited size. The nucleotide databases of Plasmodium genomes were divided into small fragments and compared to human, as well as to other Plasmodium genomes. This computational approach revealed that the Plasmodium vivax genome is interlaced with multiple DNA fragments that were likely acquired via horizontal transfer from humans. Contamination is a major concern in such studies; moreover, it must be determined if the identified homologies might be due to chance. These reservations are supported by the fact that the identified homologous... |
| Tipo: Manuscript |
Palavras-chave: Genetics & Genomics; Bioinformatics; Evolutionary Biology. |
| Ano: 2011 |
URL: http://precedings.nature.com/documents/5690/version/1 |
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| Mohit Bhardwaj; Leena Bharadwaj; Kritika Trigunayat; Madan Mohan Trigunayat. |
| The paper reveals thermal characteristics of _P.falciparum_ species specific proteins. These proteins determine why _P. vivex_ species are dominant over _P.falciparum_ in Indian geographical area. Outside human host plasmodium parasite survives in poikilothermal mosquitoes. Climatic temperature conditions greatly affect native state of _P.falciparum_ species specific proteins in mosquitoes. Study of climatic temperature conditions in Indian geographical area reveals that Pfsd protein for _Plasmodium falciparum_ can remain in native state between ≥7 degree centigrade and ≤42.6 degree centigrade temperature conditions. While their best optimum functions (activity) was noted between 25.3 degree centigrade to 33degree centigrade. Pfsd... |
| Tipo: Manuscript |
Palavras-chave: Ecology; Molecular Cell Biology; Evolutionary Biology. |
| Ano: 2010 |
URL: http://precedings.nature.com/documents/4565/version/1 |
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| BaoDe Chen; WeiYi Xu; Chen Yu; ZhenYun Ni; XueFen Li; DaWei Cui. |
| Background: Obesity promotes progression to microalbuminuria and increases the risk of chronic kidney disease. Current protocols of screening microalbuminuria are not recommended for the overweight or obese.

Design and Methods: A cross-sectional study was conducted. The relationship between metabolic risk factors and microalbuminuria was investigated. A regression model based on metabolic risk factors was developed and evaluated for predicting microalbuminuria in the overweight or obese.

Results: The prevalence of MA reached up to 17.6% in Chinese overweight men. Obesity, hypertension, hyperglycemia and hyperuricemia were the important risk factors for microalbuminuria in the overweight.... |
| Tipo: Manuscript |
Palavras-chave: Molecular Cell Biology; Evolutionary Biology. |
| Ano: 2010 |
URL: http://precedings.nature.com/documents/5372/version/1 |
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| Srilakshmi Adhyapak; V.Rao Parachuri. |
| The prolate ellipsoid left ventricular geometry is crucial for its unique contraction and relaxation patterns. Perturbations in optimal cardiac function preceding overt heart failure ensue when this ellipsoid shape assumes a more spherical configuration. This stage of spherical configuration, prior to overt dilatation, is when therapy should be intensified. The dynamic shape changes during the cardiac cycle of systole and diastole in valvular regurgitations when ventricular volumes are within normal range have proved that shape changes are clearly dissociated from volume changes in the early stages. In the scenario of advanced heart failure, several therapeutic interventions have been tried with variable success. These therapies aim at decreasing the... |
| Tipo: Manuscript |
Palavras-chave: Evolutionary Biology. |
| Ano: 2011 |
URL: http://precedings.nature.com/documents/6707/version/1 |
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| Howard Rachlin; Bryan A. Jones. |
| The amount of their own monetary reward that undergraduate participants claimed they were willing to forgo, in order to give $75 to another person, decreased hyperbolically as social distance increased between the participant and the other person. Relatives tended to be ranked at closer social distances than were non-relatives. However, even at the same social distance, participants were willing to forgo significantly more money for the benefit of relatives than for the benefit of non-relatives. These results imply that altruism is determined by factors in addition to social distance. |
| Tipo: Manuscript |
Palavras-chave: Ecology; Evolutionary Biology. |
| Ano: 2008 |
URL: http://precedings.nature.com/documents/1565/version/1 |
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| Rodrick Wallace. |
| The Stanley Miller experiment suggests that amino acid-based life is ubiquitous in our universe, although its varieties are not likely to have followed the particular, highly contingent and path-dependent, evolutionary trajectory found on Earth. Are many alien organisms likely to be conscious in ways that we would recognize? Almost certainly. Will some develop high order technology? Less likely, but still fairly probable. If so, will we be able to communicate with them? Only on a basic level, and only with profound difficulty. The argument is fairly direct. |
| Tipo: Manuscript |
Palavras-chave: Ecology; Neuroscience; Bioinformatics; Evolutionary Biology. |
| Ano: 2011 |
URL: http://precedings.nature.com/documents/5286/version/2 |
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| Rodrick Wallace. |
| The 'self-referential' character of evolutionary process noted by Goldenfeld and Woese (2010) can be restated through a 'language' model in which genes, gene expression, and environment are represented as interacting information sources. The larger, composite, source that characterizes the high probability evolutionary paths then becomes, in a real sense, a language that speaks itself. The approach represents a significant extension of nonequilibrium condensed matter formalism in which the asymptotic limit theorems of information theory beat back the mathematical thicket a full step, providing necessary, but not sufficient, conditions for punctuated evolutionary transitions that can themselves be expressed as highly... |
| Tipo: Manuscript |
Palavras-chave: Chemistry; Ecology; Genetics & Genomics; Bioinformatics; Evolutionary Biology. |
| Ano: 2010 |
URL: http://precedings.nature.com/documents/5339/version/1 |
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| Riddhi Datta; Joy Sarkar; Krishnendu Acharya. |
| The evolutionary origin of fungi is important in determining the phylogenetic relationships between fungi, animals and plants. However, determining the true relationship of fungi has been somewhat difficult owing to their simple morphology and presence of convergent characters. With the advent of newer molecular techniques, analysis of conserved protein sequences, cytochrome systems, mitochondrial and nuclear genetic material and rRNAs are being employed in elucidating phylogenetic kinships among the eukaryotes. These emerging evidences suggest that the derivation of the fungi from plants or algae would require more evolutionary changes than its derivation from protozoa, the unicellular ancestor of the animals. To gain an overview of the current state of... |
| Tipo: Manuscript |
Palavras-chave: Evolutionary Biology. |
| Ano: 2012 |
URL: http://precedings.nature.com/documents/7095/version/1 |
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| Registros recuperados: 383 | |
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