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Search Results: 1 - 10 of 483768 matches for " Claudio A. Pereira "
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Termoquímica na Unicamp: depoimento sobre uma jornada de 25 anos
Chagas, Aécio Pereira;Airoldi, Claudio;
Química Nova , 1999, DOI: 10.1590/S0100-40421999000300024
Abstract: this article describes the progress of a group of investigation on thermochemistry, which started in 1972. a homemade calorimeter was employed to provide quantitative support to the information on interative effect between lanthanide cations and halides or pseudohalides, in non-aqueous solvents, previously derived from conductometric titrations. however, the features of this instrument were not able to detect the thermal effects. therefore, the great input to the group came from the acquisition of an lkb commercial apparatus, by the university in 1975. considering the historical development of the coordination chemistry in brazil, which was previously dedicated to strutural features of adducts, without focusing the energetic envolved in any coordinationcompound. since starting the thermochemistry study, numerous masters and doctoral thesis covering more than a hundred adducts and a reasonable number of chelates, were presented systematizing data in order to understand the behavior of this kind of coordination compounds (c. airoldi and a. p. chagas, coord. chem. rev. 1992, 119, 29). this knowledge enabled an extension of the study to include some heterogeneous systems formed by natural or synthetic materials like immobilized silica gel, lamellar phosphate, phosphonate or sulphate compounds, clays, polysaccharides, chrysotile, soils, etc. many students are now engaged as staff members in universities, research instituitions or other private institutions, developing many activities. due to a multiplying effect on the formation of researchers, the group is now reaching the fourth generation.
Termoquímica na Unicamp: depoimento sobre uma jornada de 25 anos
Chagas Aécio Pereira,Airoldi Claudio
Química Nova , 1999,
Abstract: This article describes the progress of a group of investigation on thermochemistry, which started in 1972. A homemade calorimeter was employed to provide quantitative support to the information on interative effect between lanthanide cations and halides or pseudohalides, in non-aqueous solvents, previously derived from conductometric titrations. However, the features of this instrument were not able to detect the thermal effects. Therefore, the great input to the group came from the acquisition of an LKB commercial apparatus, by the University in 1975. Considering the historical development of the coordination chemistry in Brazil, which was previously dedicated to strutural features of adducts, without focusing the energetic envolved in any coordinationcompound. Since starting the thermochemistry study, numerous masters and doctoral thesis covering more than a hundred adducts and a reasonable number of chelates, were presented systematizing data in order to understand the behavior of this kind of coordination compounds (C. Airoldi and A. P. Chagas, Coord. Chem. Rev. 1992, 119, 29). This knowledge enabled an extension of the study to include some heterogeneous systems formed by natural or synthetic materials like immobilized silica gel, lamellar phosphate, phosphonate or sulphate compounds, clays, polysaccharides, chrysotile, soils, etc. Many students are now engaged as staff members in Universities, Research Instituitions or other private institutions, developing many activities. Due to a multiplying effect on the formation of researchers, the group is now reaching the fourth generation.
Anestesia em eqüinos com síndrome cólica: análise de 48 casos e revis?o de literatura
Guedes, Alonso Gabriel Pereira;Natalini, Claudio Corrêa;
Ciência Rural , 2002, DOI: 10.1590/S0103-84782002000300028
Abstract: the equine colic is a syndrome that leads to abdominal pain, hydroeletrolitic and acid-base disturbances and functional alterations of the vital organs like lungs and heart. anesthetic procedures in these animals show certain particularities that elevate the complications risk. the animals should be evaluated at the preanesthetic period and the reposition treatments should be done as necessary. the premeds should give analgesia and sedation to the animal. xylazina and/or butorphanol may be used to this aim. induction can be done with guaiacol glycerine ether, ketamine with/without diazepam, or even with ketamine and diazepam by the intravenous route. isoflurane is the anesthetic of choice for the maintenance of the anesthesia, but halothane also can be used. intermitent positive pressure ventilation should be established, with the animal receiving 100% oxygen throughout the surgical period and the imediate postoperatory period. recovery should be done in a darkness and calm environment, with soft and not slippery floor. analgesia and oxygen therapy also are important during this stage.
Anestesia em eqüinos com síndrome cólica: análise de 48 casos e revis o de literatura
Guedes Alonso Gabriel Pereira,Natalini Claudio Corrêa
Ciência Rural , 2002,
Abstract: A cólica eqüina é uma síndrome que cursa com dor abdominal, distúrbios hidroeletrolíticos e ácido-base e disfun o de órg os vitais como pulm es e cora o. Os procedimentos anestésicos nesses animais apresentam particularidades que aumentam o risco de complica es. Os animais devem ser avaliados no período pré-anestésico e as terapias de reposi o devem ser instituídas quando necessárias. A medica o pré-anestésica deve proporcionar analgesia e seda o do animal. A xilazina e/ou butorfanol podem ser utilizados com esse objetivo. A indu o pode ser realizada com éter gliceril guaiacolato e cetamina com ou sem diazepam, ou mesmo com cetamina e diazepam pela via intravenosa. A manuten o anestésica deve ser feita preferencialmente com isofluorano, mas o halotano também pode ser utilizado. Manter ventila o pulmonar mecanica, com o animal recebendo oxigênio a 100% durante todo o período cirúrgico e pós-operatório imediato. A recupera o deve ser feita em ambiente escurecido e calmo, com forra o e piso n o escorregadio. Analgesia e oxigenoterapia também s o importantes nessa fase.
Trypanosoma cruzi: Transporte de metabolitos esenciales obtenidos del hospedador
Pereira,Claudio A.; Carrillo,Carolina; Miranda,Mariana R.; Bouvier,León A.; Cánepa,Gaspar E.;
Medicina (Buenos Aires) , 2008,
Abstract: trypanosoma cruzi is the etiological agent of chagas disease, a disease endemic not only in argentina but also in all of latinamerica. t. cruzi presents several metabolic characteristics which are completely absent in its insect vectors and in mammalian hosts. some of these differences were acquired after millions of years of adaptation to parasitism, during which this protozoan replaced many biosynthetic routes for transport systems. in the present review, we describe the advances in the knowledge of t. cruzi transport processes and the molecules involved. in particular, we focus on aminoacid and polyamine transporters from the aaap family (amino acid/auxin permeases), because they seem to be exclusive transporters from trypanosomatids. taking into account that these permeases are completely absent in mammals, they could be considered as a potential target against trypanosoma cruzi.
Trypanosoma cruzi: Transporte de metabolitos esenciales obtenidos del hospedador Trypanosoma cruzi: Transport of essential metabolites acquired from the host
Claudio A. Pereira,Carolina Carrillo,Mariana R. Miranda,León A. Bouvier
Medicina (Buenos Aires) , 2008,
Abstract: El Trypanosoma cruzi es el agente causal de la enfermedad de Chagas, endémica en Argentina y en toda América Latina. Presenta numerosas características metabólicas diferenciales respecto a sus hospedadores insectos y mamíferos. Algunas de estas diferencias fueron consecuencia de millones de a os de adaptación al parasitismo en los cuales estos organismos protozoarios reemplazaron, a lo largo de su evolución, muchas rutas metabólicas de biosíntesis por sistemas de transporte de metabolitos desde el hospedador. En esta revisión se describen los avances en el conocimiento de los sistemas de transporte tanto bioquímicos como también de las moléculas involucradas en dichos procesos. Se aborda con especial énfasis los transportadores de aminoácidos y poliaminas de T. cruzi de la familia AAAP (Amino Acid/Auxin Permeases) ya que parece ser exclusiva de los tripanosomátidos. Teniendo en cuenta que estas moléculas se encuentran completamente ausentes en mamíferos podrían ser consideradas como potenciales blancos contra el Trypanosoma cruzi. Trypanosoma cruzi is the etiological agent of Chagas disease, a disease endemic not only in Argentina but also in all of Latinamerica. T. cruzi presents several metabolic characteristics which are completely absent in its insect vectors and in mammalian hosts. Some of these differences were acquired after millions of years of adaptation to parasitism, during which this protozoan replaced many biosynthetic routes for transport systems. In the present review, we describe the advances in the knowledge of T. cruzi transport processes and the molecules involved. In particular, we focus on aminoacid and polyamine transporters from the AAAP family (Amino Acid/Auxin Permeases), because they seem to be exclusive transporters from trypanosomatids. Taking into account that these permeases are completely absent in mammals, they could be considered as a potential target against Trypanosoma cruzi.
Similaridade genética entre acessos de goiabeiras e ara?azeiros baseada em marcadores moleculares AFLP
Corrêa, Luiz Claudio;Santos, Carlos Antonio Fernandes;Lima, Giuseppina Pace Pereira;Rodrigues, Marciene Amorim;Costa, Tuany Priscila Pereira;
Revista Brasileira de Fruticultura , 2011, DOI: 10.1590/S0100-29452011000300021
Abstract: species of the genus psidium, like guava and brazilian guava trees, are economically important and have the area of primary genetic diversity in brazil. it was determined the genetic relationships based on aflp marker for accessions of psidium germplasm bank (pgb) of embrapa semiarid to guide improvements and management of genetic resources of the genus. eighty-eight accessions were analyzed, 64 of guava and 24 of brazilian guava, collected in ten brazilian states, adopting for the cluster dendrogram upgma, considering the similarity matrix of jaccard's coefficient of 149 polymorphic aflp bands from 16 combinations of primers ecori and msei. analysis of variance of molecular data was performed considering the variation between and within populations of guava from the ten states. the dendrogram showed good definition, with cophenetic coefficient of 0.94. two major groups were identified: one formed by accessions of guava and other with access to brazilian guava, including some accessions of guava. specific groups were observed in the dendrogram only for individuals guava collected in goias and roraima. these accessions showed similarity ranging from 28 to 98%, suggesting a high genetic variability of them. the variation among accessions was estimated at 0.16 (φst), indicating moderate genetic differentiation among guava populations from the ten states. to increase the genetic variability of the abg studied, it is suggested to collect more hits in the states of goiás and roraima, due to the high degree of similarity among accessions from these states, as well as extensive collections in other brazilian states. crosses among the few accessions of guava which are positioned in the group of brazilian guava were also suggested for the development of interspecific hybrids in the genus psidium.
Do Haematophagous Bugs Assess Skin Surface Temperature to Detect Blood Vessels?
Raquel A. Ferreira, Claudio R. Lazzari, Marcelo G. Lorenzo, Marcos H. Pereira
PLOS ONE , 2007, DOI: 10.1371/journal.pone.0000932
Abstract: Background It is known that some blood-sucking insects have the ability to reach vessels under the host skin with their mouthparts to feed blood from inside them. However, the process by which they locate these vessels remains largely unknown. Less than 5% of the skin is occupied by blood vessels and thus, it is not likely that insects rely on a “random search strategy”, since it would increase the probability of being killed by their hosts. Indeed, heterogeneities along the skin surface might offer exploitable information for guiding insect's bites. Methodology/Principal Findings We tested whether the bug Rhodnius prolixus can evaluate temperature discontinuities along the body surface in order to locate vessels before piercing the host skin. When placed over a rabbit ear, the bug's first bites were mostly directed towards the main vessels. When insects were confronted to artificial linear heat sources presenting a temperature gradient against the background, most bites were directly addressed to the warmer linear source, notwithstanding the temperature of both, the source and the background. Finally, tests performed using uni- and bilaterally antennectomized insects revealed that the bilateral integration of thermal inputs from both antennae is necessary for precisely directing bites. Conclusions/Significance R. prolixus may be able to exploit the temperature differences observed over the skin surface to locate blood vessles. Bugs bite the warmest targets regardless of the target/background temperatures, suggesting that they do not bite choosing a preferred temperature, but select temperature discontinuities along the skin. This strategy seems to be an efficient one for finding blood vessels within a wide temperature range, allowing finding them on different hosts, as well as on different areas of the host body. Our study also adds new insight about the use of antennal thermal inputs by blood sucking bugs.
Hiperaldosteronismo primário revisitado
Passos, Vanessa Quintas;Martins, Leandro Aurélio L.;Pereira, Maria Adelaide A.;Kater, Claudio E.;
Arquivos Brasileiros de Endocrinologia & Metabologia , 2001, DOI: 10.1590/S0004-27302001000300012
Abstract: esta apresenta??o tem o objetivo de discutir o tema "hiperaldosteronismo primário" (hap). inicialmente, ser?o apresentados os dados clínicos, laboratoriais, radiológicos e o resultado do estudo anátomo-patológico do tumor de uma paciente portadora de "aldosteronoma", seguindo-se uma discuss?o centrada em três pontos principais: 1) a investiga??o de hap em pacientes com hipertens?o arterial; 2) o diagnóstico etiológico do hap; e 3) o tratamento das várias formas de apresenta??o do hap.
Hiperaldosteronismo primário revisitado
Passos Vanessa Quintas,Martins Leandro Aurélio L.,Pereira Maria Adelaide A.,Kater Claudio E.
Arquivos Brasileiros de Endocrinologia & Metabologia , 2001,
Abstract: Esta apresenta o tem o objetivo de discutir o tema "hiperaldosteronismo primário" (HAP). Inicialmente, ser o apresentados os dados clínicos, laboratoriais, radiológicos e o resultado do estudo anátomo-patológico do tumor de uma paciente portadora de "aldosteronoma", seguindo-se uma discuss o centrada em três pontos principais: 1) a investiga o de HAP em pacientes com hipertens o arterial; 2) o diagnóstico etiológico do HAP; e 3) o tratamento das várias formas de apresenta o do HAP.
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