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Search Results: 1 - 10 of 16712 matches for " Cláudio Henrique; "
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A new dark-saddled species of Hypostomus (Siluriformes: Loricariidae) from the upper rio Paraguay basin
Zawadzki, Cláudio Henrique;Weber, Claude;Pavanelli, Carla Simone;
Neotropical Ichthyology , 2010, DOI: 10.1590/S1679-62252010000400003
Abstract: a new hypostomus species is described from the rio cuiabá, upper rio paraguay basin, mato grosso state, brazil. the new species is distinguished from all other hypostomus species, with exception of young specimens of h. latifrons, by the presence of a wide dark transverse bars on laterals of body and fins; and conspicuous dark vermiculations on abdominal region. from h. latifrons it differs by having just one pre-dorsal plate surrounding supraoccipital bone and by the maintenance of the dark saddles in adults. added to the other fish species recently described from the upper rio paraguay basin, this work helps to highlight that the region still functions as a potential source of new species.
Genetic variability in three species of Gymnotus Linnaeus, 1758 (Gymnotiformes: Gymnotidae) from Caracu stream of the upper Paraná River basin, Brazil
Rezende, Judy Ruiz;Renesto, Erasmo;Zawadzki, Cláudio Henrique;
Neotropical Ichthyology , 2009, DOI: 10.1590/S1679-62252009000400010
Abstract: the genetic variability of three gymnotus species from the caracu stream, a small tributary of the left margin of paraná river (brazilian upper paraná river floodplain), was estimated with data of 17 putative allozyme loci, which were obtained by using corn starch gel electrophoresis of 10 enzymatic systems: aspartate aminotransferase (e. c., alcohol dehydrogenase (e. c., esterase (e. c., glucose dehydrogenase (e. c., glycerol-3-phosphate dehydrogenase (e. c., isocitrate dehydrogenase (e. c., l-lactate dehydrogenase (e. c., malate dehydrogenase (e. c., superoxide dismutase (e. c. and sorbitol dehydrogenase (e. c. the genetic diversity was estimated as he = 0.3458 for g. pantanal, he = 0.2481 for g. inaequilabiatus, and he = 0.3152 for g. sylvius. the most divergent species were g. sylvius and g. pantanal (d = 0.117), and the most similar were g. inaequilabiatus and g. pantanal (d = 0.051). the data indicates that the observed genetic variability was very low and the expected variability estimated for these three species is very high, and the genetic differences among them are small. the data suggest that the process of speciation which produced these three species is recent.
Estimula??o da cicatriza??o óssea pelo plasma autógeno rico em plaquetas: estudo experimental em coelhos
Wilson, Elisabete Mitiko Kobaiashi;Barbieri, Cláudio Henrique;Mazzer, Nilton;
Acta Ortopédica Brasileira , 2006, DOI: 10.1590/S1413-78522006000400006
Abstract: the autogenous blood plasma with high platelet concentration obtained through centrifugation (platelet-rich plasma, or prp) has been used in clinical practice to stimulate bone healing in a number of situations, allegedly because of its ability to carry a high concentration of platelet-derived and b-transformer growth factors, which are well known to stimulate different tissues growth and repair. in the present study, prp was used to repair a half-thick, 2-cm long segmental diaphyseal bone gap produced on new zealand rabbits? radius. periosteum was dried at the circumference of the gap site and the spinal cord cavity was sealed with bony wax in all animals in order to block the entrance of repairing cells other than the ones from the bone itself, but from surrounding tissues. three groups of 15 animals each were designed, according to the procedure performed: 1) gap left empty; 2) gap filled with prp; and 3) gap filled with an inert material (gelfoam?). in each group, the animals were deployed into three subgroups according to postoperative follow-up period, of 4, 8, and 12 weeks, respectively, after which animals were sacrificed and the radius was dried for histological study purposes. x-rays and scintiscan were taken within 4 weeks intervals, starting from the fourth postoperative week. full healing and remodeling were seen in group 2 as soon as the 8th postoperative week, while in groups 1 and 3, that process was only partial at the 12th week. tecnetium uptake was increased in all groups, remaining as such throughout the whole follow-up period in groups 1 and 3, but showing reduction between the 8th and 12th week in group 2, accompanying remodeling process, with significant differences between groups (p<0.05).
Desenvolvimento de um software flexível no estudo de regenera??o nervosa periférica
Yamasita, Alexandre Calura;Mazzer, Nilton;Barbieri, Cláudio Henrique;
Acta Ortopédica Brasileira , 2008, DOI: 10.1590/S1413-78522008000300011
Abstract: the study of the peripheral nerve regeneration after sciatic, fibular and tibial injuries, obtained through motion analysis, is regarded as a good evaluation criterion for quantifying the degree of nervous evaluation. the functional analysis of the peripheral nerves (afnp) system that can transform this process into a computed one, not only provides the user with a higher evaluation agility, but also allows researchers to use a larger number of animals on experimental groups, facilitating the capture and data storage and processing, as well. flexibility was a very important result to be highlighted, because more than one user is able to interact with the system.
Genetic variability of Hypostomus (Teleostei, Loricariidae) from the Ribeir?o Maringá, a stream of the upper Rio Paraná basin, Brazil
Paiva, Suzana de;Renesto, Erasmo;Zawadzki, Cláudio Henrique;
Genetics and Molecular Biology , 2005, DOI: 10.1590/S1415-47572005000300005
Abstract: hypostomus strigaticeps and two morphotypes of hypostomus were collected from ribeir?o maringá, a small tributary of the rio pirapó, an effluent of the upper rio paraná. the three populations were analyzed by allozyme electrophoresis that allowed the scoring of 25 loci from 14 enzyme systems. heterozygosity values (he) were 0.028 in h. strigaticeps, 0.027 in hypostomus sp. 1 and zero in hypostomus sp. 2. several diagnostic loci and fixed differences were observed for each population at loci acp-a, gcdh-a and mdhp-a. thus, all populations were genetically distinct, although there were many common alleles. the unbiased genetic identities of nei (i) were estimated as 0.780 for hypostomus sp. 1 and h. strigaticeps, 0.357 for h. strigaticeps and hypostomus sp. 2 and 0.322 for hypostomus sp. 1 and hypostomus sp. 2. the data indicate that the two morphotypes are distinct species from hypostomus strigaticeps.
Genetic evidence for two species of the genus Pimelodus Lacépède, 1803 (Siluriformes, Pimelodidae) in the Igua?u River (Brazil)
Renesto, Erasmo;Zawadzki, Cláudio Henrique;Revaldaves, Eloísa;
Genetics and Molecular Biology , 2000, DOI: 10.1590/S1415-47572000000400017
Abstract: the existence of reproductive isolation between two morphs of catfish, endemic to the igua?u river (brazil), was examined by enzyme starch gel electrophoresis. tissues of 19 catfish (pimelodus ortmanni) and 15 of a similar morph (pimelodus sp.), which differs from p. ortmanni by presenting larger and more scattered dusky spots on its skin, were analyzed. a nei's (1978) genetic identity of 0.551 was determined by the analysis of 22 enzyme loci. the loci est*1, est*2, gdh*1, gpi*1, gpi*2, idh*1, mdh*1, mdh*2, and pgm*1 were fixed for different alleles in each morph, that is, no heterozygote was found for these loci. the enzymatic patterns observed for the two morphs indicate both that the taxa are reproductively isolated and that they in fact represent separate species.
Coexistência entre Turdus leucomelas Vieillot, 1818 e Turdus rufiventris Vieillot, 1818 (Aves: Passeriformes) em um fragmento urbano de floresta com araucárias, Sul do Brasil
Vogel, Huilquer Francisco;Zawadzki, Cláudio Henrique;Metri, Rafael;
Biota Neotropica , 2011, DOI: 10.1590/S1676-06032011000300002
Abstract: we investigated the strategies which make possible the coexistence of two congeneric and relatively similar species that share habitat (turdus leucomelas and turdus rufiventris) in an urban forest fragment with araucárias. the parameters applied were average abundance, forest stratum used by birds, forest environments, morphological aspects, and diet between the species. these parameters were assessed through samplings with mist nets in the understory, verification of abundance using transects, and acquisition of regurgitation. the species showed similar patterns of occurrence in the surveyed environments - exposed border, transition, and inner forest. there was a morphological overlap of 98.67 (bray-curtis index), andt a test of canonical variables (f6, 88 = 25.39; p < 0.01) pointed significant difference for a set of seven morphological variables. although there is certain similarity between species, t. rufiventris showed higher extreme values and higher morphological variation. the overlap of trophic niche was elevated (ojk = 0.76) and the species were considered as generalists, with higher extent of trophic niche for t. rufiventris. a competitive exclusion based on feeding is not quite evident. yet, the consumed items diverged when analyzed for presence/absence, the minimum of morphological evidence and variation on the consumed resources may partially explain the coexistence. segregation between environments and occupied forest strata was not clearly demonstrated, despite detectable when regarding interior and border of the forest fragment.
Biochemical taxonomy of Crenicichla (Pisces: Perciformes: Cichlidae) of the Igua?u River, Brazil
Renesto, Erasmo;Zawadzki, Cláudio Henrique;Revaldaves, Eloísa;
Brazilian Archives of Biology and Technology , 2001, DOI: 10.1590/S1516-89132001000100003
Abstract: samples of crenicichla iguassuensis and a morph from the igua?u river which differed from c. iguassuensis by its lips morphology were examined by isozyme starch electrophoresis technique. the analysis of 27 enzyme loci exhibited a genetic identity of 0.993 between the two morphs. no diagnostic locus was found that permitted to distinguish the two crenicichla morphs. the data obtained in this investigation did not support the existence of two distinct species for this genus in the igua?u river, which suggested that the morphs stood for two polymorphic forms of crenicichla iguassuensis.
Constru??o e valida??o de uma escala de extrovers?o no modelo dos Cinco Grandes Fatores de Personalidade
Nunes, Carlos Henrique Sancineto da Silva;Hutz, Cláudio Simon;
Psico-USF , 2006, DOI: 10.1590/S1413-82712006000200003
Abstract: the present study was designed to develop and obtain construct validity for a scale to measure extraversion in the big five model. in this model, extraversion is comprised by traits that describe level of communication, assertivity, gregariousness, search for pleasure, among others. the participants in the construct validity study of the extraversion factorial scale (efe) were 1.084 individuals, from five states in brazil, of both sexes, with high school or university level of education. factor analyses were conducted to determine the efe dimensions. a 4-factor solution was found to be more adequate. the factors found were named communication, pride, assertiveness, and social interaction. cronbach's alphas were .90, .78, .78, and .83 respectively. the general scale presented internal consistency level of .91.
Avalia??o da integridade estrutural do quartzito Itacolomi empregado em monumentos históricos de Ouro Preto sem e com colagem usando diferentes resinas
Neves, José Henrique;Godefroid, Leonardo Barbosa;Candido, Luiz Cláudio;
Rem: Revista Escola de Minas , 2011, DOI: 10.1590/S0370-44672011000500015
Abstract: the art of carving stone using itacolomi quartzite was employed in the monuments of ouro preto city in minas gerais. more than 350 years after being built, some of these monuments are in an advanced stage of deterioration. in the restoration of these buildings, some restaurateurs employ orthophthalic polyester resin. in the present study, both non-glued and glued (using different types of resins) itacolomi quartzite were submitted to a flexion strength test. after some trials, it was verified that the resins supported greater loads than the quartzite. all specimens broke outside the resin's application area, thus confirming the effectiveness of resin adherence to rock.
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