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Search Results: 1 - 10 of 54032 matches for " Ronaldo Bezerra;Silva "
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Ultrasound-Assisted Synthesis of 1-N-glycosyl-1H-1,2,3-Triazole Derivatives and their Anti-inflammatory Activity Síntese mediada por ultrassom e atividade anti-inflamatória de derivados 1-N-glicosil-1H-1,2,3-triazóis
Gilson Bezerra Silva,Ronaldo Nascimento de Oliveira
Orbital : the Electronic Journal of Chemistry , 2012,
Abstract: We have been synthesized various glycosyl triazoles from the reaction between glycosyl azide (1) and terminal alkynes (2a-g). The glycopiranosyl 1,2,3-triazoles (3-9) have been obtained in moderate-to-excellent yields (63-99%) through the copper (I)-catalyst 1,3-dipolar cycloaddition reaction at room temperature using ultrasound irradiation. In addition, preliminary anti-inflammatory tests have been performed in the compounds conjugates with benzoheterocycles (3-7) moieties that shown moderate activity Foram sintetizados vários triazóis glocosídicos a partir da rea o entre glicopiranosil azida (1) e vários alcinos terminais (2a-g). Os glicopiranosil-triazóis (3-9) foram obtidos em rendimentos de moderados a excelentes (63-99%) pela rea o de cicloadi o 1,3-dipolar catalisada por cobre (I) à temperatura ambiente empregando a irradia o de ultrassom. Em continua o, foi realizado teste anti-inflamatório preliminar nos compostos conjugados com benzoeterociclos (3-7) que mostraram atividade moderada.
Growth and Photosynthetic Pigments of Cotton Cultivars Irrigated with Saline Water  [PDF]
Elka Costa Santos Nascimento, Ronaldo do Nascimento, André Alisson Rodrigues da Silva, Carlos Vailan de Castro Bezerra, Mateus Costa Batista, Luana Lucas de Sá Almeida Veloso, Márcia Cristina de Araújo Pereira, Hallyson Oliveira
Agricultural Sciences (AS) , 2019, DOI: 10.4236/as.2019.101007
Abstract: The cultivation of cotton is a relevant socioeconomic activity in the Brazilian agricultural scenario. In the Brazilian Northeast, however, production is limited by low rainfall, requiring water supplementation, a problem for the cotton cultivation practiced in the semi-arid region, due to the presence of saline ions in several water sources, from where the water is used for irrigation. It is necessary to identify cultivars that better tolerate saline stress in order to provide subsidies for their cultivation under such conditions. In this sense, the objective was to evaluate the tolerance of cotton cultivars to salinity. The experiment was conducted in a greenhouse, belonging to the Natural Resource Technology Center of the Federal University of Campina Grande, Campus I, Campina Grande, Brazil, in a completely randomized design in a 2 × 5 factorial scheme, with four replications, totaling 40 experimental units (BRS 368 RF and BRS SAFIRA) submitted to five saline levels (1.5, 3.0, 4.5, 6.0 and 7.5 dS·mˉ1). Irrigation with water saline of EC from 1.5 dS·mˉ1 affects adversely the growth of cotton cultivars, causing reductions in plant height, stem diameter, leaf area and number of leaves. Saline stress reduced the levels of the photosynthetic pigments of the cotton plants studied.
Hemiplegia cruzada associada a impress?o basilar, malforma??o de Arnold-Chiari e siringomielia: relato de caso
Silva, José Alberto Gon?alves da;Costa, Maria Desterro Leiros da;Leal, Aliane Barbosa;Reis, Fernanda Rodrigues dos;Queiroz, Ronaldo Bezerra de;
Arquivos de Neuro-Psiquiatria , 1996, DOI: 10.1590/S0004-282X1996000400019
Abstract: the authors report a case of cruciate hemiplegia associated with basilar impression, chiari malformation and syringomyelia. the neuroanatomical controversy, the surgical treatment and the good outcome of the patient are discussed.
Síndrome de Brown-Séquard na esquistossomose: relato de caso
Reis, Fernanda Rodrigues dos;Brito, José Correia de Farias;Costa, Maria do Desterro Leiros;Sousa, Aliane Barbosa Leal de;Queiroz, Ronaldo Bezerra;Silva, José Alberto Gon?alves da;
Arquivos de Neuro-Psiquiatria , 1993, DOI: 10.1590/S0004-282X1993000200024
Abstract: the authors report a case of schistosomiasis mansoni with intraspinal localization on a 39 years old man who presented neurologic manifestation likely a brown-sequard syndrome. cerebrospinal fluid examination showed positive imunofluorescente test for schistosomiasis, and treatment was started at once.
Experimental Model of Zymosan-Induced Arthritis in the Rat Temporomandibular Joint: Role of Nitric Oxide and Neutrophils
Hellíada Vasconcelos Chaves,Ronaldo de Albuquerque Ribeiro,André Mattos Brito de Souza,Antonio Alfredo Rodrigues e Silva,Antoniella Souza Gomes,Mariana Lima Vale,Mirna Marques Bezerra,Gerly Anne de Castro Brito
Journal of Biomedicine and Biotechnology , 2011, DOI: 10.1155/2011/707985
Abstract: Aims. To establish a new model of zymosan-induced temporomandibular joint (TMJ) arthritis in the rat and to investigate the role of nitric oxide. Methods. Inflammation was induced by an intra-articular injection of zymosan into the left TMJ. Mechanical hypernociception, cell influx, vascular permeability, myeloperoxidase activity, nitrite levels, and histological changes were measured in TMJ lavages or tissues at selected time points. These parameters were also evaluated after treatment with the nitric oxide synthase (NOS) inhibitors L-NAME or 1400 W. Results. Zymosan-induced TMJ arthritis caused a time-dependent leucocyte migration, plasma extravasation, mechanical hypernociception, and neutrophil accumulation between 4 and 24 h. TMJ immunohistochemical analyses showed increased inducible NOS expression. Treatment with L-NAME or 1400 W inhibited these parameters. Conclusion. Zymosan-induced TMJ arthritis is a reproducible model that may be used to assess both the mechanisms underlying TMJ inflammation and the potential tools for therapies. Nitric oxide may participate in the inflammatory temporomandibular dysfunction mechanisms.
Express?o citofotométrica dos marcadores tumorais Ki-67 e CD34 no adenocarcinoma de est?mago
Campos, José Augusto Menezes Freitas de;Cuenca, Ronaldo Mafia;Schorn, Patrícia Werlang;Ibiapina, Adriano Guimar?es;Japiassu, Glauco Antonio Bezerra;Lima, Olímpia Alves Teixeira;Silva, Paulo Henrique Freitas Farias da;Cavalcanti, Tereza Cristina Santos;
ABCD. Arquivos Brasileiros de Cirurgia Digestiva (S?o Paulo) , 2007, DOI: 10.1590/S0102-67202007000300011
Abstract: background: stomach cancer is rated as the third malignant neoplasm in the world, being the second most frequent cause of death. however, its incidence has been declining in the last few years in countries like the united states, england and australia, and in countries where its incidence has always been high - japan, china, korea and in the eastern part of asia, which has an estimated 780 cases per year per 100,000 inhabitants. aim: to describe the cytophotometric expression of ki-67 and cd-34 with comparison to their expression in stomach adenocarcinomas. methods: 60 paraffin blocks containing specimens of gastric adenocarcinomas, were initially selected in the pathology services of the gama hospital - brasília, df an at the dom orione hospital - araguaiana, to. the immunohistochemistry process using ki-67 and cd-34 was performed at the laboratório de citologia e histopatologia ltda. -citolab, curitiba, pr. a total of 35 paraffin blocks were selected among the other 60 previously selected, being used in histological studies as well as for the immunohistochemistry process. these were analyzed using the computerized image cytophotometric system (samba 4000) at the institute of medical research of the hospital universitário evangélico de curitiba. the parameters studies and analyzed through this system were the labeling index and optical density for both of the tumoral markers being independently analyzed and latter compared with each other. results: of the 35 slides, 15(42,85%) showed the expression of ki-67; 26 (74,28%) of cd-34 and 12 slides (34,28%) showed the expression of both markers. when the labeling indexes between ki-67 and cd-34 were compared, a significant difference was observed (p<0,001) favoring cd-34. when the optical density of the two markers was compared, a significant difference (p<0,001) was also observed, favoring cd-34. conclusions: the average labeling index for ki-67 was of 36,85%, where as the optical density was of 29,33 pixels. cd-34 show
Gas exchange in massai grass under five nitrogen fertilization levels during establishment and regrowth
Lopes, Marcos Neves;Lacerda, Claudivan Feitosa de;Candido, Magno José Duarte;Pompeu, Roberto Cláudio Fernandes Franco;Silva, Rodrigo Gregório da;Lopes, José Wellington Batista;Fernandes, Francisco Ronaldo Belém;Bezerra, Francisco Marcus Lima;
Revista Brasileira de Zootecnia , 2011, DOI: 10.1590/S1516-35982011000900004
Abstract: the objective of this study was to evaluate gas exchange in the massai grass during establishment and regrowth cycles in a greenhouse, using five nitrogen (n) fertilization levels. a completely randomized split-plot design of five nitrogen levels (0; 150; 300; 450 and 600 mg n?dm-3 of soil) was employed with the n levels as plots, and the cycles (establishment, regrowth 1 and 2) as subplots, evaluated with five replicates. we evaluated leaf transpiration (e), leaf temperature (tfol), leaf photosynthesis rate (a), leaf carbon dioxide concentration (ci), stomatal conductance (gs), photosynthesis/transpiration ratio (a/e), photosynthesis/conductance ratio (a/gs), chlorophyll relative index (cri), and nitrogen sufficiency index (nsi). growth cycles influenced all physiological characteristics, except for nsi. n fertilization levels affected tfol, a, cri and nsi variables, whereas for gs, e, ci, a/e and a/gs it did not occur. a increased from 6.38 to 10.33 μmol?m-2.s-1, at levels 0 and 600 mg n?dm-3 of soil, respectively. gas exchange in the massai grass was favored by nitrogen fertilization, since the cycles amended these characteristics of the grass.
Sobrevivência e crescimento de mudas de sabiá em podzólico vermelho-amarelo sob eros?o simulada
Pesquisa Agropecuária Brasileira , 2000, DOI: 10.1590/S0100-204X2000000500025
Abstract: the objective of this research was to determine changes in properties of a red-yellow podzolic soil, related to the gradual removal of the plow layer through simulated erosion and its effects on survival and growth of mimosa caesalpiniaefolia benth seedlings. in 1990, the experiment was conducted in a greenhouse of the universidade federal do ceará, in fortaleza, ce, brazil, in layers of 0-15, 5-20, 10-25, 15-30, 20-35 and 25-40 cm which were removed from a red-yellow podzolic profile and contained in plastic bags where seeds were planted and seedlings were grown for 85 days. higher values of clay percentage, available water, k and ca contents and of cec at deeper layers did not reduce the negative impact of erosion on the seedlings survival and growth since they were associated with increases of al saturation as well as with significant decreases in ph, organic matter, base saturation and n, p and mg contents in the soil. as depth of the removed layers increased, seedlings survival percentage, seedlings height, root and aerial part dry weights, as well as total dry biomass gradually decreased. compared to the 0-15 cm layer, at 25-40 cm those decreases were 16.8, 66.3, 67.1, 82.0, and 79.6%, respectively.
Sobrevivência e crescimento de mudas de sabiá em podzólico vermelho-amarelo sob eros o simulada
Pesquisa Agropecuária Brasileira , 2000,
Abstract: O objetivo deste trabalho foi estudar mudan as nas propriedades de um Podzólico Vermelho-Amarelo relacionadas à remo o gradual de sua camada arável por meio de eros o simulada e seus efeitos na sobrevivência e crescimento de mudas de sabiá (Mimosa caesalpiniaefolia Benth). O experimento foi conduzido em casa de vegeta o, em 1990, no Departamento de Ciência do Solo, UFC, em Fortaleza, CE, em camadas do solo de 0-15, 5-20, 10-25, 15-30, 20-35 e 25-40 cm, as quais foram removidas e acondicionadas em sacos de plástico, onde as sementes foram plantadas e as mudas desenvolveram-se por 85 dias. Maiores valores de porcentagem de argila, de água disponível, de teores de K e Ca e da CTC determinados nas camadas mais profundas n o reduziram o impacto negativo da eros o na sobrevivência e crescimento das mudas, pois eles estavam associados a aumentos da satura o por Al, bem como a significativos decréscimos no pH, na matéria organica, na satura o por bases e nos teores de N, P e Mg no solo. à medida que a profundidade das camadas removidas aumentava, a porcentagem de sobrevivência, a altura, o peso seco das raízes e da parte aérea, bem como a biomassa seca total das plantas gradualmente decrescia; esses decréscimos foram de 16,8, 66,3, 67,1, 82,0 e 79,6%, respectivamente, na camada de 25-40 cm, em rela o aos dados da camada 0-15 cm.
The trace formulas yield the inverse metric formula
Ronaldo Rodrigues Silva
Physics , 1998,
Abstract: It is a well-known fact that the first and last non-trivial coefficients of the characteristic polynomial of a linear operator are respectively its trace and its determinant. This work shows how to compute recursively all the coefficients as polynomial functions in the traces of successive powers of the operator. With the aid of Cayley-Hamilton's theorem the trace formulas provide a rational formula for the resolvent kernel and an operator-valued null identity for each finite dimension of the underlying vector space. The 4-dimensional resolvent formula allows an algebraic solution of the inverse metric problem in general relativity.
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