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Search Results: 1 - 10 of 645 matches for " Caio; "
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Evolutionary Changes in the Complexity of the Tectum of Nontetrapods: A Cladistic Approach
Caio Maximino
PLOS ONE , 2008, DOI: 10.1371/journal.pone.0003582
Abstract: Background The tectum is a structure localized in the roof of the midbrain in vertebrates, and is taken to be highly conserved in evolution. The present article assessed three hypotheses concerning the evolution of lamination and citoarchitecture of the tectum of nontetrapod animals: 1) There is a significant degree of phylogenetic inertia in both traits studied (number of cellular layers and number of cell classes in tectum); 2) Both traits are positively correlated accross evolution after correction for phylogeny; and 3) Different developmental pathways should generate different patterns of lamination and cytoarchitecture. Methodology/Principal Findings The hypotheses were tested using analytical-computational tools for phylogenetic hypothesis testing. Both traits presented a considerably large phylogenetic signal and were positively associated. However, no difference was found between two clades classified as per the general developmental pathways of their brains. Conclusions/Significance The evidence amassed points to more variation in the tectum than would be expected by phylogeny in three species from the taxa analysed; this variation is not better explained by differences in the main course of development, as would be predicted by the developmental clade hypothesis. Those findings shed new light on the evolution of an functionally important structure in nontetrapods, the most basal radiations of vertebrates.
O problema da autoria na teoria literária: apagamentos, retomadas e revis?es
Gagliardi, Caio;
Estudos Avan?ados , 2010, DOI: 10.1590/S0103-40142010000200018
Abstract: the latest discussions about authorship are closely related to the searching for the meaning of the text. because of that, the authorship is being understood as one of the most controversial subjects in literature theory. the first two parts of this paper comprehend a critic and sistematic analysis of 1. the author refusal as source of the text meaning (proust, eliot, croce, wimsatt and beardsley, derrida, barthes and foucault), and 2. the defense and reviewing of this concept (booth, bloom, eco e compagnon). and in the last part, 3. it is proposed a particular hypothesis of analises and interpretation of the authorship, through a change of contexts: the recurrence to the heteronomy concept, by fernando pessoa.
Modulation of nociceptive-like behavior in zebrafish (Danio rerio) by environmental stressors
Maximino, Caio;
Psychology & Neuroscience , 2011, DOI: 10.3922/j.psns.2011.1.017
Abstract: zebrafish have been demonstrated to react consistently to noxious chemical stimuli and present reliable phenotypes of stress, fear, and anxiety. in this article, we describe the modulation of nociceptive-like responses of zebrafish to fear-, stress-, and anxiety-eliciting situations. animals were exposed to an alarm substance, confinement stress, or a novel environment before being injected with 1% acetic acid in the tail. the alarm substance and confinement stress reduced the display of erratic movements and tail-beating behavior elicited by acetic acid. the novelty of the environment, in contrast, increased the frequency of tail-beating behavior. the results suggest that descending modulatory control of nociception exists in zebrafish, with apparent fear- and stress-induced analgesia and anxiety-induced hyperalgesia.
Estudo de raios cósmicos utilizando uma camara de nuvens de baixo custo
Laganá, Caio;
Revista Brasileira de Ensino de Física , 2011, DOI: 10.1590/S1806-11172011000300002
Abstract: using images from cosmic rays interactions obtained with a low cost cloud chamber, the main observed phenomena in such an experiment are presented, discussed and classified.
água escondida
Caio Reisewitz
ARS (S?o Paulo) , 2011, DOI: 10.1590/s1678-53202011000100001
Abstract:
Considera es sobre a jurisprudencializa o do Direito
Caio Leal
Revista de Direito dos Monitores da Universidade Federal Fluminense , 2009,
Abstract: Este estudo procura analisar a jurisprudencializa o do direito à luz do preenchimento da inefetividade do legislador e do envelhecimento das codifica es, tomando a jurisprudência como fonte [criadora] do direito. Dentre as considera es, uma análise de caso e um passeio pelos campos da Teoria Geral do Direito, do Direito Constitucional e do Direito Penal.
Modulation of nociceptive-like behavior in zebrafsh (Danio rerio) by environmental stressors
Caio Maximino
Psychology & Neuroscience , 2011,
Abstract: Zebrafsh have been demonstrated to react consistently to noxious chemical stimuli and present reliable phenotypes of stress, fear, and anxiety. In this article, we describe the modulation of nociceptive-like responses of zebrafsh to fear-, stress-, and anxiety-eliciting situations. Animals were exposed to an alarm substance, confnement stress, or a novel environment before being injected with 1% acetic acid in the tail. The alarm substance and confnement stress reduced the display of erratic movements and tail-beating behavior elicited by acetic acid. The novelty of the environment, in contrast, increased the frequency of tail-beating behavior. The results suggest that descending modulatory control of nociception exists in zebrafsh, with apparent fear- and stress-induced analgesia and anxiety-induced hyperalgesia.
Topological study of the first step of nucleophilically unassisted solvolysis of protonated 2-endo/exo-norbornanol and protonated 2-endo/exo-oxabicycloheptanol
Firme, Caio L.;
Journal of the Brazilian Chemical Society , 2012, DOI: 10.1590/S0103-50532012000300019
Abstract: the assistance of s electron delocalization or anchimeric assistance of s electrons accounts for the large rate differences in the solvolysis of 2-exo- and 2-endo-norbornyl-p-bromobenzenesulfonates. this study was formerly analyzed by molecular orbital theory in gas phase. by revisiting this old problem from the quantum theory of atoms in molecules (qtaim), new information on these reactions was obtained. the qtaim results show that, in the first step of the nucleophilically unassisted solvolysis of protonated 2-exo-norbornanol and of protonated 2-endo-norbornanol, both reactions are anchimerically assisted by sigma bond participation. similarly, in the first step of the nucleophilically unassisted solvolysis of protonated 2-endo-oxabicycloheptanol and of protonated 2-exo-oxabicycloheptanol, the qtaim results show that both reactions are anchimerically assisted: the former from sigma bond participation from o-c bonds and valence shell electron participation from oxygen atom and the latter from sigma bond participation from c1-c2 bond.
O conceito de opera??o estabelecedora na análise do comportamento
Miguel, Caio F.;
Psicologia: Teoria e Pesquisa , 2000, DOI: 10.1590/S0102-37722000000300009
Abstract: in general terms, establishing operations can be defined as environmental events that alter the reinforcing effectiveness of a stimulus, as well as evoke all behavior that, in the past, has been followed by such a stimulus. the concept seems to describe, in behavioral terms, what is usually called motivation. the present paper is an attempt to didactically present the theoretical development of the concept and discuss its current status in the experimental analysis of behavior and applied behavior analysis.
1964: o golpe contra as reformas e a democracia
Toledo, Caio Navarro de;
Revista Brasileira de História , 2004, DOI: 10.1590/S0102-01882004000100002
Abstract: it is our intention in this article to demonstrate that the beginning of the military dictatorship in 1964 represented on one hand a blow against social reforms defended by brazilian progressist groups and on the other hand a blow against the inchoate political democracy established in 1945.
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