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Search Results: 1 - 10 of 658061 matches for " José Roberto M. C. da Silva "
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Diel vertical migration and distribution of zooplankton in a tropical Brazilian reservoir
Ana M. A. da Silva,José E. L. Barbosa,Paulo Roberto de Medeiros,Maria C. B. C. da Silva
Biotemas , 2009,
Abstract: Diel vertical migration of zooplankton is a strategy usually employed to reduce the risk of predation, and it can also be associated with the environmental day/night shifts, particularly of light and temperature. The aim of this study was to identify the diel patterns of zooplankton vertical migration and their relationship to the environmental variables in a shallow reservoir in northeastern Brazil. Water samples were taken at a single five-meter depth sampling station (Subsurface, 50% Io, 1% Io and Bottom) at four-hour intervals over a period of 24 hours. Two Cladocera species (Moina minuta and Diaphanosoma spinulosum) and one Copepoda species (Notodiaptomus cearensis) showed similar patterns of nocturnal migration, staying at the bottom during the day and rising toward the surface in the afternoon and during the night. Brachionus falcatus and Hexarthra mira (Rotifera) showed no patterns of vertical migration and their vertical distributions were relatively homogenous. Environmental variables were poorly correlated to the species distribution, suggesting that other mechanisms may be responsible of inducing vertical migration.
Sistema respiratório de Amphisbaena vermicularis e Amphisbaena microcephala (Squamata, Amphisbaenia, Amphisbaenidae) Respiratory system of Amphisbaena vermicularis and Amphisbaena microcephala (Squamata, Amphisbaenia, Amphisbaenidae)
Maria Eliana C. Navega-Gon?alves,José Roberto M. C. da Silva
Iheringia. Série Zoologia , 2013,
Abstract: A morfologia macro e microscópica da traqueia e pulm es de Amphisbaena vermicularis Wagler, 1824 e Amphisbaena microcephala (Wagler, 1824), assim como a ultraestrutura das camaras respiratórias, foram descritas pela primeira vez neste estudo. A traqueia n o se ramifica e seu segmento caudal, situado entre os pulm es, foi denominado br nquio. O pulm o esquerdo é alongado, saculiforme e unicameral, com parênquima faveolar na por o cranial e trabecular, na por o caudal. Camaras respiratórias est o presentes em ambas as regi es do pulm o, mas é possível que a regi o caudal funcione também como reservatório de ar. O pulm o direito está reduzido nas duas espécies, no entanto em A. vermicularis a redu o é bastante acentuada e apenas um vestígio deste órg o pode ser observado, mas em A. microcephala o pulm o direito é um órg o com limites definidos que se comunica com a por o caudal do tubo traqueal, através de dois orifícios. Pneumócitos tipo I e tipo II est o presentes nas camaras respiratórias. As laminas basais dos pneumócitos I e das células endoteliais encontram-se fundidas, de forma a diminuir a barreira ar-sangue, que é de aproximadamente 0,5 μm em A. microcephala. As características morfológicas descritas neste estudo podem representar adapta es que permitem a sobrevivência dos espécimes de Amphisbaenia nas galerias subterraneas, onde passam a maior parte de suas vidas sob condi es de baixa renova o de ar, níveis de umidade relativamente variáveis e partículas em suspens o. The macroscopic and microscopic morphology of the trachea and lungs of Amphisbaena vermicularis Wagler, 1824 and Amphisbaena microcephala (Wagler, 1824), as well as the ultrastructure of the pulmonary respiratory chambers of the latter, are described for the first time. The trachea does not ramify, and its caudal segment, between the lungs, was named bronchus. The left lung is long, sac-like and unicameral, with a faveolar parenchyma in the cranial portion and a trabecular parenchyma in the caudal portion. Respiratory chambers are present in both regions of the lungs and it is suggested that the caudal portion acts as a reservoir of air. The right lung is reduced in both species, however in A. vermicularis this reduction is fairly pronounced and only a vestige of this organ can be observed, but in A. microcephala the right lung is a delimited organ that links to the caudal portion of the tracheal tube through two holes. Pneumocytes I and II occur in the respiratory chambers. The basal membranes of the pneumocytes I and of the endothelial cells are fused, diminishing the air-t
Estudo comparativo entre os fios de polidioxanona e poliamida na tenorrafia de coelhos
Silva Roberto Antoniolli da,Fagundes Djalma José,Silva Andréia C.M. Antoniolli da,Figueiredo Arthur Silveira de
Acta Cirurgica Brasileira , 2002,
Abstract: OBJETIVO: estabelecer compara o entre as propriedades mecanicas das tenorrafias realizadas com poliamida (náilon) e polidioxanona (PDS). MéTODOS: Foram utilizados 56 coelhos adultos, machos, Nova Zelandia, distribuídos em dois grupos e quatro subgrupos: GIA - tenorrafias com polidioxanona e avalia o após duas semanas; GIB - tenorrafias com polidioxanona e avalia o após quatro semanas; GIIA - tenorrafias com náilon e avalia o após duas semanas; GIIB - tenorrafias com náilon e avalia o após quatro semanas. Foram realizados ensaios de tra o nas tenorrafias dos tend es dos coelhos. RESULTADOS: na avalia o aos quinze dias de pós-operatório, o náilon apresentou como resultados dos ensaios mecanicos, valores superiores que os do PDS para carga máxima, coeficiente de rigidez, deforma o, deforma o no limite de proporcionalidade, carga no limite de proporcionalidade, que foram as variáveis analisadas. CONCLUS O: aos trinta dias de pós-operatório n o houve diferen a significante entre o uso do náilon e o PDS.
Aspectos morfológicos, germina??o e desenvolvimento inicial de plantulas de Archontophoenix alexandrae (F. Mueller) H. Wendl. e Drude (Arecaceae) em diferentes substratos
Charlo, Hamilton César de Oliveira;M?ro, Fabíola Vitti;Silva, Vanessa Lorencini da;Silva, Breno Marques da Silva e;Bianco, Silvano;M?ro, José Roberto;
Revista árvore , 2006, DOI: 10.1590/S0100-67622006000600008
Abstract: this work aimed at describing the morphology and germination phases of diaspores, in order to determine a more suitable substrate for germination and growth of queen palm seedlings. representative units of each germination phase were removed periodically for the morphological descriptions. the used substrates were plantmax?, sand, rich soil and a substrate with equal ratios of soil, sand and manure (tae). the experiment was performed in a completely randomized design. the percentage and the time of germination and the initial growth of seedlings at 135 days after the emergency were evaluated on the basis of seedling height, crown diameter, leaf number, length and width of leaves. seeds are albuminous, with a ruminated and oleaginous endosperm. the embryo is lateral, peripheral and relatively undifferentiated. the germination is hypogeal cryptocotyledonary, initiating with the formation of an undifferentiated cell mass in the micropilary depression. this mass of cells becomes cylindrical, with the differentiation of the shoot and root primordium. it is concluded that for the germination of queen palm seeds, the most indicated substrate is plantmax?, however for the initial growth, both plantmax? and tae are indicated.
Estudo comparativo entre os fios de polidioxanona e poliamida na tenorrafia de coelhos
Silva, Roberto Antoniolli da;Fagundes, Djalma José;Silva, Andréia C.M. Antoniolli da;Figueiredo, Arthur Silveira de;Cantero, Wilson de Barros;
Acta Cirurgica Brasileira , 2002, DOI: 10.1590/S0102-86502002000100006
Abstract: objective: comparative study between the mechanical properties of the tenorraphies with poliamida (nylon) and polidioxanone (pds). methods: 56 adult, male, new zealand rabbits were used, distributed in two groups and four sub groups: gia-tenorraphies with polidioxanone and evaluation after two weeks; gib-tenorraphies with polidioxanone and evaluation after four weeks; giia-tenorraphies with nylon and evaluation after two weeks; giib-tenorraphies with nylon and evaluation after four weeks. traction tests were done in tenorraphies of the rabbits. results: after fifteen days nylon presented as results of the mechanical tests, superior values that the one of pds for maximum load, rigidity coefficient, deformation, deformation in the proportionality limit, load in the proportionality limit, that were the variable analysed. conclusion: after thirty days there was not significant difference between nylon and pds.
Rela??o entre características morfológicas da cariopse e fusariose em milho
Costa, Raquel Silva;M?ro, Fabíola Vitti;M?ro, José Roberto;Silva, Herberte Pereira da;Panizzi, Rita de Cássia;
Pesquisa Agropecuária Brasileira , 2003, DOI: 10.1590/S0100-204X2003000100004
Abstract: fusarium ear rot of corn caused by fusarium moniliforme is responsible for severe yield losses. probably fungal penetration in the caryopsis takes place at the silk scar and is related to the level of infection and the morphological characteristics of the caryopsis. the objective of this work was to identify morphological characteristics that confer resistance to the fungus in caryopsis of corn. caryopsis of six lines of corn, with and without inoculation with the pathogen, were evaluated using a stereomicroscope and scanning electron microscope. morphological characteristics of the caryopsis such as tegument with saliences and reentrances accentuated, pericarp no much thick, starch less compact and presence of the silk canal favor the penetration of f. moniliforme.
Morfologia e avalia??o do crescimento inicial de plantulas de Bactris gasipaes Kunth. (arecaceae) em diferentes substratos
Silva, Vanessa Lorencini da;M?ro, Fabíola Vitti;Dami?o Filho, Carlos Ferreira;M?ro, José Roberto;Silva, Breno Marques da Silva e;Charlo, Hamilton César de Oliveira;
Revista Brasileira de Fruticultura , 2006, DOI: 10.1590/S0100-29452006000300030
Abstract: this work aimed to describe the morphology of the diaspore, the phases of germination and to determine the most adequate substratum for germination and development of peach palm. periodically, representative units of each phase of germination had been removed for the description of the sequence of the morphological events. the used substrata for germination and initial growth were plantmax ht, sand, rich soil and another one with equal ratios of soil, sand and manure (ssm). it was evaluated the percentage and the speed of germination and the initial growth of the seedlings at 101 days after the sowing, on the basis of their leaf height, leaf number, length and width of the leaves. it was observed that the seeds are albuminous, with an oleaginous and hard endosperm. the embryo is lateral, peripheral and relatively undifferentiated, with conic shape. the germination starts with an undifferentiated mass of cells at the micropilar depression. afterward that structure becomes cylindrical, with the differentiation of the shoot and the primordial roots. the shoot is constituted by three sheathings wrapping the primary leaf. they open themselves successively allowing the primary leaf to emerge. among the substrata the more adequate ones for the initial grow of bactris gasipaes seedlings were ssm and plantmax.
Control of schistosomiasis mansoni in ravena (Sabará, State of Minas Gerais, Brazil) through Water supply and quadrennial treatments
Coura-Filho, Pedro;Rocha, Roberto Sena;Lamartine, Simone da Silva;Farah, Márcio William C;Resende, Dilermando Fazito de;Costa, José Oswaldo;Katz, Naftale;
Memórias do Instituto Oswaldo Cruz , 1996, DOI: 10.1590/S0074-02761996000600001
Abstract: in this study, the results obtained in a control programme of schistosomiasis in ravena (sabará, minas gerais) between 1980 and 1992 are evaluated. control measures used in this programme were: specific treatment of the people infected with schistosoma mansoni at four year-intervals (1980/84/88) and the supply of tap water to 90% of the residences in 1980. a significant reduction of the prevalence (36.7% to 11.5%, p < 0.05) and of the intensity of the infection (228.9 eggs per gram of feces (epg), s = 3.7 to 60.3 epg, s = 3.5, p < 0.05) was observed. no cases of the severe form of the disease were diagnosed in the area. factors independently associated with the infection were in 1980 daily sand extraction and the lack of tap water in residences and in 1992 daily sand extraction and fishing and weekly swimming. concluding, the supply of tap water together with quadrennial treatments significantly diminished both the prevalence and intensity of the s. mansoni infection, with the additional gain of persistent low indices even after four-year intervals between the treatments.
Schistosomiasis haematobia: histopathological course determined by cystoscopy in a patient in whom praziquantel treatment failed
Silva, Iran Mendon?a da;Pereira Filho, Edson;Thiengo, Roberto;Ribeiro, Paulo César;Concei??o, Maria José;Panasco, M?nica;Lenzi, Henrique Leonel;
Revista do Instituto de Medicina Tropical de S?o Paulo , 2008, DOI: 10.1590/S0036-46652008000600006
Abstract: schistosomiasis haematobia or urinary schistosomiasis is one of the main public health problems in africa and the middle east. a single dose of 40 mg praziquantel per kg body weight continues to be the treatment of choice for this infection. the aims of this follow-up were to study the post-treatment course of a patient infected with s. haematobium and not submitted to re-exposure, and to identify complications of the disease and/or therapeutic failure after praziquantel treatment by histopathological analysis. treatments were repeated under medical supervision to ensure the correct use of the drug. in view of the suspicion of lesions in cystoscopy, the patient was submitted to bladder biopsy. the histopathological characteristics observed in biopsies obtained, after each treatment, indicated viability of parasite eggs and activity of granulomas.
Contribui??o da análise eletrofisiológica e anat?mica do circuito atípico da taquicardia atrioventricular nodal
Silva, Maila Seifert Macedo;Sá, Roberto Luiz M. da Silva;Fagundes, Márcio Luiz A.;Cruz Filho, Fernando E. S.;Arantes, Leonardo B.;Boghossian, Silvia;Almeida, Adriana Monteiro C. David de;Fagundes, Rafael Lopes;Romeo Filho, Luiz José;
Arquivos Brasileiros de Cardiologia , 2007, DOI: 10.1590/S0066-782X2007000200003
Abstract: objectives: to analyze retrograde conduction during junctional ectopic tachycardia (jet) episodes and investigate the existence of a relationship between the presence of a retrograde block and the risk of atrioventricular block (avb) development during radiofrequency ablation procedures in patients with nodal atrioventricular tachycardia (navt). methods: 145 male and female patients aged 16-84 years, with navt who had undergone radiofrequency catheter ablation in the posteroseptal region of the right atrium were studied. evaluation criteria were anatomical location and electrophysiological behavior of retrograde conduction during navt, in order to understand the nodal reentrant circuit (classifying the tachycardia as typical or atypical), and monitoring of retrograde conduction during jet episodes for risk-predicting avb events. results: of the 145 patients studied, 132 (91%) met electrophysiological and anatomical criteria of the typical form of navt, and 13 (9%) of atypical form. during the ablation, 5.3% with the typical form and 30.8% of the atypical form presented risk events for avb. after the ablation, complications were a total avb episode in one patient and a first-degree avb episode in another in the typical group, and one first-degree avb in the atypical group. all three episodes were preceded by risk events and resulted in permanent nodal injury. conclusion: patients with atypical navt presented higher percentages of risk events for atrioventricular block than did patients with the typical form (p=0.021).a careful observation of retrograde conduction during jet episodes is vital in order to avoid permanent damage in av nodal conduction, such as tavb, after the ablation procedure.
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