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Fitomassa de adubos verdes e cobertura do solo na regi o do Alto Vale do Jequitinhonha, Minas Gerais = Biomass of green manure and soil cover in the region of Vale do Jequitinhonha, Minas Gerais-Brazil.
Gustavo Antnio Mendes Pereira,Daniel Valad?o Silva,Renan Rodrigues Braga,Felipe Paolinelli de Carvalho
Agro@mbiente On-line , 2012,
Abstract: A aduba o verde constitui prática cultural de relevante impacto positivo em sistemas de produ o agrícola que visam o uso sustentável da terra. Objetivou-se com esse trabalho avaliar o desempenho de seis leguminosas utilizadas para aduba o verde, quanto à produtividade de fitomassa, cobertura do solo e uso da radia o fotossinteticamente ativa na regi o conhecida como Alto Vale do Jequitinhonha em Minas Gerais. O experimento foi conduzido entre os meses de mar o a outubro de 2010, em delineamento em blocos casualizados com quatro repeti es. Os adubos verdes utilizados foram: crotalária (Crotalariaspectabilis), feij o-de-porco (Canavalia ensiformis), feij o-guandu-an o (Cajanus cajan), lab-lab (Lablab purpureus), mucuna-an (Mucuna deenringiana) e tremo o-branco (Lupinus albus L.). Os adubos verdes apresentaram elevadas produ es de fitomassa, mas com diferentes picos de cobertura do solo e intercepta o da radia o. Os maiores acúmulos de matéria seca e fresca foram observados pela crotalária seguido pelo feij o-guandu-an o. Entre as espécies estudadas, o feij o-de-porco é aque apresentou maior período vegetativo, representando elevado potencial para recobrimento do solo, destacando-se também na intercepta o de radia o fotossinteticamente ativa.Green manuring is a positive practice that reduces the impact on agricultural production systems aimed at sustainable land use. The objective of this study was to evaluate the performance of six legumes used for green manure, the productivity of biomass, land cover and use of photosynthetic active radiation in the region of the Vale do Jequitinhonha, Minas Gerais, Brazil. The experiment was conducted during March to October, 2010 in randomized block design with four replications. Green manures were used: Crotalaria spectabilis, Canavalia ensiformis, Cajanus cajan, Lablab purpureus, Mucuna deenringiana and Lupinus albus. Green manures had high yields of biomass, however, different peaks of ground cover and radiation interception were observed. The largest accumulations of dry and fresh matter were observed in C. spectabilis followed by C. cajan. Amongthe species studied, C. ensiformis has a larger growing season, representing great potential for soil covering, and is importantfor the interception of photosynthetically active radiation.
Tratamento fungicida e peliculiza??o de sementes de soja submetidas ao armazenamento
Pereira, Carlos Eduardo;Oliveira, Jo?o Almir;Guimar?es, Renato Mendes;Vieira, Antnio Rodrigues;Evangelista, José Renato Emilioreli;Oliveira, Gustavo Evangelista;
Ciência e Agrotecnologia , 2011, DOI: 10.1590/S1413-70542011000100020
Abstract: the treatment of soybean seeds by fungicides has been used as an important tool in pathogen control. the objective of this work was to verify the performance of soybean seeds treated with fungicide and film coating, prior and after storage. five seed lots, cultivar monsoy 6101, were treated with thiabendazole+thiram without polymer, carbendazin+thiram without polymer, without fungicide (control), without polymer, and treatments by film coating (with polymer). the physiological and sanitary quality of the seeds was evaluated initially and after six months storage, under environmental conditions, according to the following characteristics: water content, test of germination and emergence on tray, blotter test and cold test. the film coating associated with fungicides does not affect the physiological quality of soybean seeds and the soybean seed treatment with the fungicides thiabendazole+thiram and carbendazin+thiram improves performance and sanitary quality.
Which factors could explain the low birth weight paradox?
Silva,Antnio Augusto Moura da; Bettiol,Heloisa; Barbieri,Marco Antonio; Brito,Luiz Gustavo Oliveira; Pereira,Márcio Mendes; Arag?o,Vania Maria Farias de; Ribeiro,Valdinar Sousa;
Revista de Saúde Pública , 2006, DOI: 10.1590/S0034-89102006000500014
Abstract: objective: low birth weight children are unusual among well-off families. however, in brazil, low birth weight rate was higher in a more developed city than in a less developed one. the study objective was to find out the reasons to explain this paradox. methods: a study was carried out in two municipalities, ribeir?o preto (southeastern brazil) and s?o luís (northeastern brazil), which low birth weight rates were 10.7% and 7.6% respectively. data from two birth cohorts were analyzed: 2,839 newborns in ribeir?o preto in 1994 and 2,439 births in s?o luís in 1997-1998. multiple logistic regression analysis was performed, adjusted for confounders. results: low birth weight risk factors in s?o luís were primiparity, maternal smoking and maternal age less than 18 years. in ribeir?o preto, the associated variables were family income between one and three minimum wages, maternal age less than 18 and equal to or more than 35 years, maternal smoking and cesarean section. in a combined model including both cohorts, ribeir?o preto presented a 45% higher risk of low birth weight than s?o luís. when adjusted for maternal smoking habit, the excess risk for low birth weight in ribeir?o preto compared to s?o luís was reduced by 49%, but the confidence interval was marginally significant. differences in cesarean section rates between both cities contributed to partially explain the paradox. conclusions: maternal smoking was the most important risk factor for explaining the difference in low birth weight between both cities. the other factors contributed little to explain the difference in low birth weight rates.
Infant mortality and low birth weight in cities of Northeastern and Southeastern Brazil
Silva,Antnio Augusto Moura da; Bettiol,Heloísa; Barbieri,Marco Antnio; Ribeiro,Valdinar Sousa; Arag?o,Vania Maria de Farias; Brito,Luiz Gustavo Oliveira; Pereira,Márcio Mendes;
Revista de Saúde Pública , 2003, DOI: 10.1590/S0034-89102003000600002
Abstract: objective: to compare estimates of low birth weight (lbw), preterm birth, small for gestational age (sga), and infant mortality in two birth cohorts in brazil. methods: the two cohorts were performed during the 1990s, in s?o luís, located in a less developed area in northeastern brazil, and ribeir?o preto, situated in a more developed region in southeastern brazil. data from one-third of all live births in ribeir?o preto in 1994 were collected (2,839 single deliveries). in s?o luís, systematic sampling of deliveries stratified by maternity hospital was performed from 1997 to 1998 (2,439 single deliveries). the chi-squared (for categories and trends) and student t tests were used in the statistical analyses. results: the lbw rate was lower in s?o luís, thus presenting an epidemiological paradox. the preterm birth rates were similar, although expected to be higher in ribeir?o preto because of the direct relationship between preterm birth and lbw. dissociation between lbw and infant mortality was observed, since s?o luís showed a lower lbw rate and higher infant mortality, while the opposite occurred in ribeir?o preto. conclusions: higher prevalence of maternal smoking and better access to and quality of perinatal care, thereby leading to earlier medical interventions (cesarean section and induced preterm births) that resulted in more low weight live births than stillbirths in ribeir?o preto, may explain these paradoxes. the ecological dissociation observed between lbw and infant mortality indicates that the lbw rate should no longer be systematically considered as an indicator of social development.
Crescimento da mandioca e plantas daninhas em resposta à aduba??o fosfatada
Pereira, Gustavo Antnio Mendes;Lemos, Vinícius Teixeira;Santos, José Barbosa dos;Ferreira, Evander Alves;Silva, Daniel Valad?o;Oliveira, Maxwel Coura de;Menezes, Claubert Wagner Guimar?es de;
Revista Ceres , 2012, DOI: 10.1590/S0034-737X2012000500019
Abstract: fertilizers may be used to change the competitive relations, favoring the crop species, providing the competing species have different responses to the nutrient application. thus, the aim of this study was to evaluate the growth of cassava plant, bidens pilosa l. and brachiaria decumbens stapf, as a function of the amount of p supplied at planting. the experiment was conducted in a greenhouse and the, treatments were arranged in a 3 x 4 factorial, involving the three species studied and four levels of phosphate fertilization (absence of p2o5, 80 kg ha-1, 800 kg ha-1 and 4000 kg ha-1 p2o5, equivalent to 0, 1, 10 and 50 times the phosphorus dose recommended, respectively). a randomized block design was used, with five replications. the application of phosphate fertilizer promoted larger growth of the species evaluated, and cassava had higher growth of the shoot with the increased availability of phosphorus. in general, weeds showed higher responses to lower doses of phosphorus.
Profilaxia de tromboembolismo venoso em pacientes com les o cerebral traumática Venous thromboembolism prophylaxis in patients with traumatic brain injury
Tanya L. Zakrison,Bruno Monteiro Pereira,Antnio C. Marttos Jr,Gustavo Pereira Fraga
Revista do Colégio Brasileiro de Cirurgi?es , 2012,
Abstract: Traumatismo cranio-encefálico (TCE), com hemorragia intracraniana associada (HIC) ocorre com frequência em trauma. Pacientes vítimas de trauma também est o em alto risco de desenvolver complica es venosas tromboembólicas (TEV). Heparina de Baixo Peso Molecular (HBPM) é utilizada em pacientes de trauma, como profilaxia para reduzir o risco de eventos de TEV. Ainda n o está claro, no entanto, se a HBPM é segura para uso em pacientes com trauma com HIC por receio da progress o do hematoma. O Clube de Revista "Telemedicina Baseada em Evidências: Cirurgia do Trauma e Emergência (TBE-CiTE)" realizou uma aprecia o crítica de três estudos recentes e mais relevantes no tocante ao momento de início da profilaxia, à seguran a e ao uso de HBPM em pacientes com trauma e HIC. Especificamente, três estudos foram revisados: i) uma revis o crítica da literatura sobre o tema, ii) um estudo multicêntrico, estudo de coorte retrospectivo avaliando a seguran a de HBPM em pacientes com trauma, e com HIC e iii) um estudo piloto randomizado, avaliando a viabilidade e as taxas de eventos de progress o de HIC, servindo como base para futuros ensaios clínicos randomizados (ECR) sobre o tema. Alguns resultados s o conflitantes, com o maior nível de evidência sendo o ECR piloto demonstrando a seguran a para o uso precoce de HBPM no TCE associado com HIC. Grande parte desta pesquisa, porém, foi gerada por um único centro e, consequentemente, carece de validade externa. Além disso, as recomenda es clínicas n o podem ser geradas com base em estudos-piloto. Diretrizes baseadas em evidências e recomenda es n o podem ser feitas, neste momento, até a realiza o de outros estudos sobre este assunto desafiador. Traumatic brain injury (TBI) with associated intracranial hemorrhage (ICH) occurs frequently in trauma. Trauma patients are also at high risk of developing venous thromboembolic (VTE) complications. Low Molecular Weight Heparin (LMWH) is used in trauma patients as prophylaxis to reduce the risk of VTE events. It remains unclear, however, if LMWH is safe to use in trauma patients with ICH for fear of hematoma progression. The "Evidence-based telemedicine: trauma & acute care surgery (EBT-TACS)" Journal Club performed a critical appraisal of 3 recent and most relevant studies on timing to initiate, safety and use of LMWH in trauma patients with ICH. Specifically, we appraised a i) critical literature review on the topic, ii) a multicenter, retrospective cohort study assessing the safety of LMWH in trauma patients with ICH and iii) a randomized, pilot study assessing the feasibility
Avalia??o da produtividade e vigor vegetativo de linhagens das cultivares catuaí vermelho e catuaí amarelo (Coffea arabica L.) plantadas individualmente e em diferentes combina??es
Nogueira, ?ngela Maria;Carvalho, Samuel Pereira de;Bartholo, Gabriel Ferreira;Mendes, Antnio Nazareno Guimar?es;
Ciência e Agrotecnologia , 2005, DOI: 10.1590/S1413-70542005000100003
Abstract: one experiment was conducted at epamig`s experimental station at s?o sebasti?o do paraíso, mg, to evaluate yield characteristics and vegetative vigor, of "catuaí vermelho" (iac 44, iac 81, and iac 99), "catuai amarelo" (iac 47, iac 62, and iac 86), coffee lineage cultivars from 1994 to 1999, planted isolated and in different combinations. an experimental randomized blocks design was used, with 3 replications 14 lineages combination as treatment, each plot with six plants, spaced 3.5 by 1.0 m, respectively among interrows and lines. lineages cultivars were grouped and planted isolated and in multi-lines at proposition of 33% and 50%. characteristics were evaluated individually, and averages compared by duncan test. coffee cultivars combinations planted in multi-lines showed greater yield and greater vigor plants as compared to isolated planting. "catuaí vermelho" iac 44 cultivar in combination with the iac 81 and the lineage combinations of the iac 81 and iac 99 at 50% proportion of each, showed positive interaction by the fact of to present greater yield than when planted isolated. take in account lineages of "catuaí amarelo", better combination was found with iac 47 by iac 62 at 50% proportion. there were no differences in vegetative vigor among lineages; some differences occurred is due to environment interactions with lineage.
Avalia??o da matura??o dos frutos de linhagens das cultivares Catuaí Amarelo e Catuaí Vermelho(Coffea arabica L.) plantadas individualmente e em combina??es
Nogueira, ?ngela Maria;Carvalho, Samuel Pereira de;Bartholo, Gabriel Ferreira;Mendes, Antnio Nazareno Guimar?es;
Ciência e Agrotecnologia , 2005, DOI: 10.1590/S1413-70542005000100002
Abstract: the experiment conducted in epamig?s experimental station at s?o sebasti?o do paraíso, mg, to evaluate percentage of empty fruits and fruit ripening, of catuaí vermelho (iac 44, iac 81, and iac 99) and catuai amarelo (iac 47, iac 62, and iac 86), all catuai lineages, from 1994 to 1999, planted isolated and in different combinations. a randomized block design was used, with 3 replications and 14 lineages combination as treatment, each plot with six plants, spaced 3.5 by 1.0 m, respectively among interrows and lines. lineages cultivars were grouped and planted isolated and in multi-lines at proposition of 33% and 50%. six characteristics were evaluated, and averages compared by duncan test. there were no differences in planting systems over the fruit maturation stages and empty fruits.
Influência do lantanio nas propriedades elétricas do titanato de bário obtido por síntese hidrotérmica
Pereira, Renato Alves;Mendes Filho, Antnio Alves;Araújo, Fernando Gabriel da Silva;
Rem: Revista Escola de Minas , 2006, DOI: 10.1590/S0370-44672006000200010
Abstract: barium titanate powders were produced by hydrothermal synthesis, at 220oc, for 20 hours, in stoichiometric composition and doped with lantanum varying from 0.2 to 1.0mol%.the powders were characterized by x-ray diffraction and then pressed at 3,000 kgf to form discs. the discs were sinterized on air at 1250oc for 5 hours and characterized by x-ray diffraction, scanning electron microscopy and complex impedanciometry
Rigitano: nova cultivar de umezeiro para porta-enxerto de pessegueiro
Pereira, Fernando Mendes;Mayer, Newton Alex;Campo Dall'orto, Fernando Antnio;
Revista Brasileira de Fruticultura , 2007, DOI: 10.1590/S0100-29452007000100036
Abstract: the brazilian research had not developed until the present moment a clonal rootstock for peach tree culture with desirable agronomic characteristics, including root-knot nematode resistance, herbaceous cuttings propagation facilities and quality induction for fruits. the aim of this work is present the mume cultivar rigitano, selected and approved to constitute a new rootstock for peach tree culture. initially, identified as 'clone 10', 'rigitano' cultivar is resultant of a wide research collaboration project, carried out with clonal vegetal material coming from instituto agron?mico de campinas, brazil, started in 1998 at faculdade de ciências agrárias e veterinárias (fcav), universidade estadual paulista (unesp), jaboticabal campus, s?o paulo state, brazil. the selection and multiplication works began with propagation experiments with herbaceous cuttings in intermittent mist system, whose results indicated viability of the method in four year season, in jaboticabal climatic conditions. the bud with 'aurora-1' peach (ship budding or ship budding modified) was shown vailable in larger diameter rootstocks (± 10 mm). at field conditions, 'rigitano' revealed to be the least vigorous comparing to the other mume's clones studied. besides, 'rigitano' is resistant to meloidogyne javanica and m. incognita, however, it is susceptible to mesocriconema xenoplax. the results at field conditions, as rootstock of 'aurora-1' peach, reveal good productivity, pomological and technological fruits qualities. the research results reveals wide possibilities of 'rigitano' as peach tree rootstock success, with good possibilities for plantation reduction space and better quality of fruit production.
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