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Search Results: 1 - 10 of 329685 matches for " Reis S "
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Role of the serotoninergic system in the sodium appetite control
Reis, Luís C.;
Anais da Academia Brasileira de Ciências , 2007, DOI: 10.1590/S0001-37652007000200009
Abstract: the present article reviews the role of the serotoninergic system in the regulation of the sodium appetite. data from the peripheral and icv administration of serotoninergic (5-htergic) agents showed the participation of 5-ht2/3 receptors in the modulation of sodium appetite. these observations were extended with the studies carried out after brain serotonin depletion, lesions of drn and during blockade of 5-ht2a/2c receptors in lateral parabrachial nucleus (lpbn). brain serotonin depletion and lesions of drn increased the sodium appetite response, in basal conditions, after sodium depletion and hypovolemia or after beta-adrenergic stimulation as well. these observations raised the hypothesis that the suppression of ascending pathways from the drn, possibly, 5-htergic fibers, modifies the angiotensinergic or sodium sensing mechanisms of the subfornical organ involved in the control of the sodium appetite. 5-htergic blockade in lpbn induced to similar results, particularly those regarded to the natriorexigenic response evoked by volume depletion or increase of the hypertonic saline ingestion induced by brain angiotensinergic stimulation. in conclusion, many evidences lead to acceptation of an integrated participation resulting of an interaction, between drn and lpbn, for the sodium appetite control.
Diamagnetic magnetocaloric effect due to a transversal oscillating magnetic field
M. S. Reis
Physics , 2015, DOI: 10.1016/j.physleta.2014.05.002
Abstract: The present Letter describes the magnetocaloric effect of a diamagnetic material with a magnetic field $B_\parallel$ along the $z$ axis and a transversal and oscillating field $B_\perp (\ll B_\parallel)$ parallel to the $x-y$ plane. We show that the magnetocaloric potentials due to a change in $B_\parallel$ is the same as those due to a change in the frequency of $B_\perp$. These results raise the possibility of building magnetocaloric devices without moving parts, since changing frequency is a simple electronic issue, while changing the field from permanent magnets depends on mechanical aspects.
Oscillating magnetocaloric effect of a 2D non-relativistic diamagnetic material
M. S. Reis
Physics , 2015, DOI: 10.1063/1.4812282
Abstract: Among the magnetic materials, those with ferromagnetic character are, by far, the most studied in what concerns applications of the magnetocaloric effect. However, recently, diamagnetic materials received due attention never received before, and an oscillatory behavior, analogous to the de Haas-van Alphen effect, has been found. The present effort describes in details the magnetocaloric properties of a 2D non-relativistic material (a Gold thin film, for instance), where oscillations, depending on the reciprocal magnetic field $1/B$, are found. A comparison of the magnetic entropy change per electron for some cases is presented and we found $\approx10^{-1}$ k$_{\text{B}}$ (@109.3 K) for graphenes, $\approx10^{-5}$ k$_{\text{B}}$ (@0.7 K) for 2D Gold and $\approx 10^{-7}$ k$_{\text{B}}$ (@0.7 K) for 3D Gold.
Influence of longitudinal electric field on the oscillating magnetocaloric effect of graphenes
M. S. Reis
Physics , 2015, DOI: 10.1016/j.ssc.2013.03.002
Abstract: The present effort explores the influence of a longitudinal applied electric field on the magnetocaloric properties of graphenes. The magnetic entropy change $\Delta S(T,\Delta B,E)$ has two contributions: $S_{cos}(T,B,E)$ with an oscillating character on $m$, inversely proportional to the magnetic field; and $S_{per}(T,B,E)$ with a periodic character also on $m$. In comparison to the case without electric field, the maximum value of the magnetic entropy change either increases or decreases due to an applied electric field, depending on the value of $m$; and, in addition, the temperature in which the maximum entropy change occurs decreases due to the electric field.
Step-like features on caloric effects of graphenes
M. S. Reis
Physics , 2015, DOI: 10.1016/j.physleta.2013.10.054
Abstract: We considered a graphene nano-ribbon with a longitudinal electric field (along $x$ direction) and a transversal magnetic field (along $z$ direction), and then observe (i) the electrocaloric effect ruled by an applied magnetic field and (ii) the magnetocaloric effect ruled by an applied electric field. We focused our attention to the limit of low temperatures, and then observed interesting step-like features. For each filled Landau level $n$, created by the applied magnetic field, both caloric effects increase proportionally to $n+1/2$; and this step measures either important graphene properties (like Fermi velocity) or quantum fundamental quantities (like Planck constant and magnetic flux quantum).
Next-generation sequencing
Jorge S Reis-Filho
Breast Cancer Research , 2009, DOI: 10.1186/bcr2431
Abstract: Since the publication of the first draft of the human genome sequence [1,2], the field of genomics has changed dramatically. Most importantly, the availability of this information has led to a technological boom, with the development of high-throughput methods that could be used to interrogate the wealth of data available in the human genome and transcriptome. The fields of genomic and transcriptomic science have expanded at an unprecedented pace.In the past decade we have witnessed the rise of microarrays, a technology that has been extensively applied to the study of cancer genomes and transcriptomes. Of all solid cancers, breast cancer has been the most comprehensively studied using these methods. Although some of the promises of microarrays have not materialised in the time frame some of the proponents of this technology have foreseen, the high-throughput data generated in microarray-based experiments have changed the way breast cancer is perceived [3,4]. The approach has brought to the forefront of cancer research the concepts of breast cancer heterogeneity - that distinct molecular subtypes of breast cancer are underpinned by distinct genetic and epigenetic aberrations, and that distinct subtypes of breast cancer may have their prognosis and response to therapy governed by distinct molecular pathways and networks [5,6]. It should be noted, however, that microarray-based expression profiling and comparative genomic hybridisation provide data with important limitations. For instance, microarray-based expression profiling only provides a semiquantitative assessment of gene expression; it is limited by the nature of the probes included in the platform and their sensitivity and specificity. Comparative genomic hybridisation and SNP array analysis have provided a wealth of data on gene copy number aberrations in breast cancer and have helped identify potential therapeutic targets for subgroups of breast cancer patients; however, this technology does not provide any
Outbreak of Fusarium oxysporum f. sp. lycopersici race 3 in commercial fresh-market tomato fields in Rio de Janeiro State, Brazil
Reis, Ailton;Boiteux, Leonardo S;
Horticultura Brasileira , 2007, DOI: 10.1590/S0102-05362007000300025
Abstract: fusarium wilt, caused by three races of fusarium oxysporum f. sp. lycopersici, is one of the most important tomato diseases. in brazil, all three races were reported, however, race 3 has been so far restricted only to espírito santo state. in the present work, seven f. oxysporum isolates obtained from wilted plants of the race 1 and 2-resistant tomato hybrids 'giovana', 'carmen' and 'alambra' in s?o josé de ubá and itaocara (rio de janeiro state, brazil) were characterized at race level. virulence assays were performed using a set of race differential cultivars: 'ponderosa' (susceptible to all races), 'ipa-5' (resistant to race 1), 'floradade' (resistant to races 1 and 2), 'bhrs-2,3' (resistant to all three races). two wild tomato accessions (solanum pennellii 'la 716' e s. chilense 'la 1967') previously reported as resistant to all brazilian isolates of f. oxysporum f. sp. lycopersici were also evaluated. isolates from s?o josé de ubá and itaocara were highly virulent to 'ponderosa', 'ipa-5' and 'floradade'. they were also able to infect a few plants of 'bhrs-2,3', inducing vascular browning and wilt symptoms. solanum pennellii and s. chilense accessions displayed an extreme (immune-like) resistant response. these results indicated that all seven isolates could be classified as f. oxysporum f. sp. lycopersici race 3, expanding the geographical distribution of this pathogen within brazil. the hypothesis of transmission via contaminated seeds is reinforced after the present report, which confirms the almost simultaneous outbreak of race 3 in two geographically isolated tomato-growing areas in brazil (espirito santo and rio de janeiro). evaluation of commercial seed lots imported into brazil for contamination with the pathogen would be necessary in order to avoid nation-wide spread of this serious disease.
Morfometria e estatística multivariada em biologia evolutiva
Reis, Sérgio F. dos;
Revista Brasileira de Zoologia , 1988, DOI: 10.1590/S0101-81751988000400005
Abstract: recent analytical and conceptual developments in multivariate statistics and morphometrics are reviewed. these developments include a modification of principal components analysis, the shear, and the truss networks, a geometric protocol for the generation of variables for statistical analyses. the implications of these techniques for studies of organismal evolution are discussed.
S. M. Reis,徐凡
心理科学进展 , 1989,
Abstract: 文中就与天才女性有关的一些主要问题提出了一个总的看法。这些方面主要包括:未充分发挥潜力的天才女性;女性的创造性生产力;数学和自然科学中的男性优势;文化陈观、性角色和其他;缺乏计划;尽善尽美情结和伪装综合症有关咨询和特殊群体的问题。文章扼要地讨论了与性别有关的能力、成就、个性、社会环境压力等问题的有关研究,并对将来的研究方向提出了一些建议。
O comunitarismo crist o e suas influências na política brasileira – uma revis o bibliográfica sobre o comunitarismo católico no Brasil
Robson Sávio Reis Souza
Horizonte : Revista de Estudos de Teologia e Ciências da Religi?o , 2009, DOI: 10.5752/439
Abstract: Resumo Apresentaremos neste artigo uma breve discuss o acerca das influências do comunitarismo crist o na vida social e política brasileira. Trata-se de um ensaio exploratório. O objetivo é uma revis o bibliográfica sobre o tema. A partir daquilo que foi possível selecionar, tentamos elaborar algumas ideias, no sentido de apresentar, mesmo que sucintamente, tópicos que podem indicar a importancia do comunitarismo crist o, tradi o forte e influente n o somente nas décadas de 1960 e 1970, mas que, sobretudo no atual contexto político, ainda desempenha um papel central na sociedade brasileira. Recorte especial é a análise sobre as influências do comunitarismo nas a es da Igreja Católica, no Brasil. Assim, a Teologia da Liberta o e as Comunidades Eclesiais de Base (CEBs) derivariam do pensamento comunitarista. Por fim, o comunitarismo crist o é apresentado como uma rea o ao neoliberalismo, por priorizar "o valor inelutável da dignidade e da transcendência humana e uma resistência insuperável a deixar engolfar o destino humano em uma lógica mercantil, de individualismo possessivo. Essa tradi o, em grande medida identificada com as posi es hoje encarnadas pela CNBB, é responsável por vastas experiências de solidariedade entre os pobres e oprimidos brasileiros". Palavras-chave: Comunitarismo crist o; Igreja Católica; A o social; Política; Movimentos sociais. Abstract This article discusses briefly the influences of Christian Communitarianism on Brazilian social and political life. It is an exploratory essay aimed at a bibliographical review of the subject. Based on what was possible to select, we tried to elaborate some ideas to present topics that may indicate the importance of Christian Communitarianism, a strong and influent tradition, not only in the 1960s and 1970s, but especially in the current political context, still playing a central role in Brazilian society. A special point is the analysis of the influences of Communitarianism on actions of the Catholic Church in Brazil. Thus, the Theology of Liberation and the Base Ecclesial Communities (BECs) could have derived from the communitarian thought. Finally, Christian Communitarianism is presented as a reaction against neoliberalism, as it gives priority to "the inestimable value of human dignity and transcendence and an insuperable resistance to let human destiny be engulfed by a mercantile logic of possessive individualism. This tradition, largely identified with the positions assumed by CNBB, is responsible for vast experiences of solidarity between the Brazilian poor and oppressed".
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