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107 results on '"Mendes, R.S."'

15. Time-resolved thermal mirror method: a theoretical study

Author

Sato, F., Malacarne, L.C., Pedreira, P.R.B., Belancon, M.P., Mendes, R.S., Baesso, M.L., Astrath, N.G.C., and Shen, J.

Subjects
Solids -- Thermal properties, Solids -- Optical properties, Solids -- Mechanical properties, Heat -- Conduction, Heat -- Analysis, Physics
Abstract

The development of a general and complete theoretical model of the time-resolved thermal mirror method for the measurement of thermo-optical-mechanical properties of solid materials is reported. The experimental results obtained by the model are used for determining the physical properties of transparent and opaque solids.

Published
2008

17. Miocardite crônica em um cão naturalmente infectado com Leishmania (Leishmania) infantum chagasi: aspectos clínicos e patológicos

Author

Mendes, R.S., Gurjão, T.A., Oliveira, L.M., Santana, V.L., Tafuri, W.L., Santos, J.R.S., Dantas, A.F.M., and Souza, A.P.

Subjects
troponina I, cão, imuno-histoquímica, immunohistochemical, parasitic diseases, dog, Leishmania infantum chagasi, troponin I, miocardite, myocarditis
Abstract

A leishmaniose visceral (LV) é uma doença infecciosa crônica frequentemente fatal causada pela Leishmania infantum chagasi nas Américas. A enfermidade pode acometer vários órgãos, determinando diferentes manifestações clínicas. Contudo o envolvimento do coração raramente tem sido reportado em cães infectados por Leishmania sp. Dessa forma, descreve-se um caso de miocardite crônica com repercussões clínicas e patológicas em um cão naturalmente infectado por Leishmania infantum chagasi. A positividade para Leishmaniose Visceral foi determinada pela presença de anticorpos antiLeishmania sp. nos testes sorológicos (RIFI, ELISA e DPP) e confirmada por visualização de formas amastigotas de Leishmania sp. em punção aspirativa do linfonodo poplíteo. O exame cardiovascular revelou alterações radiográficas, eletrocardiográficas, na pressão arterial e nos biomarcardores cardíacos. Após eutanásia, amostras de tecido cardíaco foram avaliadas histologicamente e submetidas à imunomarcação, onde foi observado infiltrado mononuclear (plasmo-histiolinfocitário), com presença de estruturas arredondadas de coloracão marrom-amareladas (imunomarcadas), indicando formas amastigotas de Leishmania infantum chagasi no miocárdio. Os aspectos etiopatogênicos da leishmaniose visceral sobre o miocárdio neste caso podem estar relacionados tanto à presença do parasita quanto à resposta "reacional inespecífica" do tecido à agressão do parasita no organismo. Todavia ainda não se sabem se as cepas de Leishmania infantum chagasi da região semiárida paraibana apresentam algum tropismo por tecido cardíaco ou se induzem a reação imunológica cruzada, com implicações clínicas. Visceral leishmaniasis (VL) is a chronic, often fatal infectious disease caused by Leishmania infantum chagasi in the Americas. The disease can affect many organs and may express different clinical forms. However, the involvement of the heart has rarely been reported in dogs infected by Leishmania sp. Thus, we describe a case of chronic myocarditis with clinical and pathological effects in a dog naturally infected by Leishmania infantum chagasi. Positivity for Visceral Leishmaniasis was determined by the presence of anti-Leishmania sp. in serological tests (IFAT, ELISA and DPP) and confirmed by visualization of amastigote forms of the parasite in the popliteal lymph node aspiration samples. The cardiovascular clinical examination showed changes in the radiographic, ECG, blood pressure and heart biomarkers. After euthanasia, heart tissue samples were histologically examined and underwent our immunohistochemistry assessment, where mononuclear infiltrate was observed (plasma cells, lymphocytes and macrophages) with the presence of rounded brownish-yellow (immunomarked) cells, indicating amastigotes of Leishmania infantum chagasi within the myocardium. The etiopathogenic aspects of visceral leishmaniasis in the myocardium in this case may be related either to the presence of the parasite or the "nonspecific reactive" response of the tissue attributable to the aggression of the parasite in the body. However, it is not known if the strains of Leishmania infantum chagasi found in the semi-arid of Paraíba have some tropism for cardiac tissue or if they induce immunological cross-reaction with clinical implications.

Published
2014

23. Identificação de Sistemas a Eventos Discretos Maxplus lineares

Author

Maia, C.A., Mendes, R.S., Hardouin, Laurent, Laboratoire d'Ingéniérie des Systèmes Automatisés (LISA), Université d'Angers (UA), and Gerard, Marie-Françoise

Subjects
ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2005

31. Attractive forces between electrons in (2+1) - dimensional QED

Author

Girotti, Horacio Oscar, Gomes, Marcelo, Lyra, J.L. de, Mendes, R.S., Nascimento, J.R.S., and Silva, Adilson J. da

Subjects
Fisica de particulas elementares e campos, Teoria quantica de campos
Abstract

Vacuum polarization effects are nonperturbatively incorporated into the photon propagator to eliminate the severe infrared problems characteristic of (2+1)-dimensional QED (QED₃). The theory is thus rephrased in terms of a massive vector boson whose mass is e²/8π. Subsequently, it is shown that electron-electron bound states are possible in QED₃.

Published
1992

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