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Search Results: 1 - 10 of 531847 matches for " José Guilherme Lan?a Rodrigues "
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Diagnose foliar em plantas de milho em sistema de semeadura direta em fun o de doses e épocas de aplica o de nitrogênio
Flávia Meinicke Nascimento,Silvio José Bicudo,Dirceu Maximino Fernandes,José Guilherme Lana Rodrigues
Pesquisa Aplicada & Agrotecnologia , 2012, DOI: 10.5777/paet.v5.n1.04
Abstract: O objetivo da pesquisa foi avaliar a resposta da cultura do milho em sucess o à culturas de inverno, havendo a antecipa o da aplica o do nitrogênio na cultura da aveia, em doses crescentes, no SPD. O experimento foi conduzido na FCA/UNESP, Campus de Botucatu-SP. O delineamento experimental foi de blocos ao acaso com quatro repeti es, em parcelas subdivididas, sendo consideradas parcelas as doses de nitrogênio aplicadas na cultura da aveia: 0, 20, 40 e 60 kg ha-1 e as doses de nitrogênio aplicadas em cobertura na cultura do milho, foram consideradas subparcelas, variando nas seguintes doses: 60, 80, 100 e 120 kg ha-1, aplicados de forma parcelada em dois estádios da cultura do milho. A diagnose foliar foi feita no estádio de florescimento e após a colheita foi calculada a produtividade. Os resultados indicam que a aplica o antecipada de N na cultura do milho é dependente da cultura antecessora e que as doses e épocas destas aplica es influíram nas concentra es dos nutrientes, refletindo na produtividade do milho. El objetivo de esta investigación fue evaluar la respuesta del maíz en sucesión con cultivos de invierno, con la anticipación de la aplicación de nitrógeno en la avena, en dosis crecientes, en el sistema de siembra directa SSD. El experimento se realizó en la FCA / UNESP, Campus de Botucatu-SP. El dise o experimental fue en bloques al azar con cuatro repeticiones, en parcelas subdivididas, siendo consideradas parcelas las dosis de nitrógeno aplicadas en la avena: 0, 20, 40 y 60 kg ha-1 y las dosis de nitrógeno aplicadas en cobertura en el cultivo de maíz, fueron consideradas subparcelas, variando en: 60 kg, 80, 100 y 120 ha-1, aplicadas de manera parcelada en dos momentos de crecimiento del maíz. El análisis foliar se realizó durante la floración y después de la cosecha se calculó la productividad. Los resultados indican que la aplicación temprana de N en el maíz depende de la cosecha anterior y que las dosis y tiempos de estas aplicaciones han influido en las concentraciones de nutrientes, reflejando en la productividad del maíz.
Dinámica espacial de la tierra en la cuenca del arroyo de la Figuera - S o Manuel (SP)
Flávia Meinicke Nascimento,Zacarias Xavier de Barros,Sergio Campos,José Guilherme Lana Rodrigues
Pesquisa Aplicada & Agrotecnologia , 2012, DOI: 10.5777/1483
Abstract: Este trabalho teve como objetivo caracterizar a evolu o do uso e ocupa o do solo no período de 20 anos, bem como verificar as possíveis áreas de conflito de uso do solo em APP ocorrentes na Microbacia do Córrego da Figueira – Município de S o Manuel (SP), obtidas de imagens de satélite por meio do aplicativo Carta Linx e do SIG-Idrisi; tendo como base cartográfica as imagens de satélite Landsat 5, bandas 3; 4 e 5, órbita 220, ponto 76, quadrante A, passagens 1990 e 2010. Os resultados mostraram que o SIG Idrisi Andes 15.0 foi eficiente na identifica o e mapeamento das áreas de uso da terra, facilitando o processamento dos dados. A área ocupada predominantemente pela cultura canavieira mostrou que as altera es espa o-temporal praticamente n o ocorreram nos últimos 20 anos. O mapeamento das áreas de conflito de uso permitiu verificar que a área de estudo está bem preservada, sendo o conflito inexpressivo, pois o relevo plano a ondulado da Microbacia é totalmente favorável para o cultivo da cana-de-a úcar. Os resultados permitiram inferir que as classes de declive de 0 a 3% e de 3 a 6% representam mais de 84% da área e as de 0 a 20% predominaram em quase 100% da microbacia. Este estudio tuvo como objetivo caracterizar la evolución del uso y ocupación del suelo dentro de los 20 a os, y determinar las posibles áreas de conflicto de uso del suelo tierra en APP que ocurre en la Cuenca del corego de la Figueira - Municipio de S oManuel (SP), obtenido a partir de imágenes de satelitales a través de la aplicación del aplicativo Carta Linux y del SIG Idrisi: teniendo por base cartográfica imágenes del satélite Landsat 5, bandas 3, 4 y 5, la órbita 220, punto 76, en el cuadrante A, pasajes 1990 y 2010. Los resultados mostraron que el SIG Idrisi Andes - 15,0 fue eficaz en la identificación y mapeo del uso del suelo, facilitando el tratamiento de los datos. El área predominantemente ocupada por la ca a de azúcar mostró que los cambios espacio-temporales casi no se produjeron en los últimos 20 a os. El mapeo de las zonas de conflicto de uso demostró que el área de estudio está bien conservada, siendo el conflicto insignificante, debido a que el relieve del terreno es llano a ondulado de la Cuenca es totalmente favorable para el cultivo de la ca a de azúcar. Los resultados mostraron que las clases de pendiente 0-3% y 3-6% representan más del 84% de la superficie y el 0-20% predominó en casi el 100% de la cuenca.
Physical characterization of soil and operational performance of agricultural machines in the deployment of forage sorghum Caracteriza o física do solo e desempenho operacional de máquinas agrícolas na implanta o da cultura do sorgo forrageiro
José Guilherme Lana Rodrigues,Jairo Costa Fernandes,Flávia Meinicke Nascimento,Carlos Antonio Gamero
Semina : Ciências Agrárias , 2011,
Abstract: Forage sorghum can be grown in areas presenting dry and hot environmental situations where the yield of other grasses can often be uneconomical. The objective of this study was to analyze the operating performance of agricultural machines in the deployment of sorghum forage in four tillage systems, as follows: no-tillage system, disk harrow + seeding, disk harrow + two light disking + seeding, minimum tillage + seeding and four seeding different speeds, as follows: 3, 5, 6 and 9 km h-1. The study was performed under field conditions in FCA / UNESP, Botucatu County, SP, Brazil. The data were subjected to variance analysis in a simple factorial 4 x 4, and a random block design with split plots. Operational performance of the agricultural machinery, physical characteristics the soil, its water content and the yield of dry matter and green sorghum were determined. The operational performance of agricultural machines in the deployment of sorghum forage is influenced by the sowing speed and the soil tillage system used. Chisel plow was the equipment that required the highest mean traction force, mean traction and slip, as well as the lowest mean speed for the studied tillage system. Forage sorghum showed higher yields in no-tillage systems at a seeding speed of 5 km h-1. O sorgo forrageiro pode ser cultivado em áreas e situa es ambientais secas e quentes, onde a produtividade de outras forrageiras pode ser normalmente antiecon mica. O objetivo do trabalho foi analisar o desempenho operacional de máquinas agrícolas na implanta o da cultura do sorgo forrageiro em quatro sistemas de preparo do solo: semeadura direta; gradagem pesada + semeadura; gradagem pesada + duas gradagens leves + semeadura; cultivo reduzido + semeadura e quatro velocidades de semeadura: 3, 5, 6 e 9 km h-1. O experimento foi instalado em condi es de campo, na FCA/UNESP, Campus de Botucatu - SP. Os dados obtidos foram submetidos à análise de variancia em esquema fatorial simples, 4 x 4, sendo o delineamento experimental em blocos ao acaso com parcelas subdivididas. Foram estudados o desempenho operacional das máquinas agrícolas, as características físicas do solo, o teor de água e a produtividade de massa seca e verde do sorgo. Concluiu-se que o desempenho operacional de máquinas agrícolas na implanta o da cultura do sorgo forrageiro é influenciado pela velocidade de semeadura e pelo sistema de preparo do solo. O escarificador foi o equipamento que exigiu do trator a maior for a média de tra o, potência média de tra o, patinagem e apresentou a menor velocidade média de trabalho para os
Produtividade de genótipos de milho em resposta à época de semeadura
Nascimento, Flávia Meinicke;Bicudo, Sílvio José;Rodrigues, José Guilherme Lana;Furtado, Mariléia Barros;Campos, Sérgio;
Revista Ceres , 2011, DOI: 10.1590/S0034-737X2011000200010
Abstract: the objective of this study was to evaluate the influence of four sowing times on the yield of three maize cultivars with different phenological stages. field experiments were carried out in the fca/unesp-campus, botucatu, s?o paulo state, brazil. the experiments were arranged in a randomized block design with six repetitions, considering maize genetic composition and sowing times as causes of variation. the treatments were arranged in a 3x4 factorial design, with three cultivars al 34 (late cycle), ag 9010 (early cycle) and dkb 333b (medium-early cycle) planted in 4 sowing times, august, october and december 2003 and february 2004. data were examined by analysis of variance and means were compared by the tukey test at 5% probability level. sowing in february provided a more rapid emergence, differing from the other times regardless of cultivar. the number of leaves above and below the ear and the initial and final population were influenced by sowing time. for plant height, genetics and physiology of cultivars predominated. sowing in february allowed the identification of differences in productivity resulted from the integration of production components. yield of cultivars al 34, ag 9010 and dkb 333b depends on sowing time and vegetative cycle of each cultivar.
Produ??o de matéria seca em pastagem de Tifton 85 irrigada, com diferentes doses de dejeto líquido de suíno
Drumond, Luís C. D.;Zanini, José R.;Aguiar, Adilson de P. A.;Rodrigues, Guilherme P.;Fernandes, André L. T.;
Engenharia Agrícola , 2006, DOI: 10.1590/S0100-69162006000200010
Abstract: liquid swine dejection (lsd) can constitute excellent source of fertilization in pasture, with sprinkler irrigation system, provided the conditions that assure the protection of the environment. although with proved potential for growth without irrigation, for the cynodon sp cultivar tifton 85 there is little information on its behavior and production in systems under irrigation and with lsd. in order to determine the production of dry matter in irrigated and with lsd fertirrigation, an experiment was carried out in the farm-school of the university of uberaba - mg, brazil, with net-sprinkler irrigation system, applying 0, 50, 100 and 200 m3 ha-1 year-1of lsd. there was significant effect among the doses of lsd in the production of dry matter, occurring additions of production with the increasing the doses. the supply of 200 m3 ha-1 year-1 of lsd made possible the production of 5,928 kg of the forage dry matter for the cycle of 28 days.
Characterization of cassava clones produced in Roraima for in natura consumption. = Caracteriza o e identifica o de clones de mandioca produzidos em Roraima para o consumo in natura.
Natália Trajano de Oliveira,José Maria Arcanjo Alves,Sandra Cátia Pereira Uch?a,Guilherme Silva Rodrigues
Agro@mbiente On-line , 2011,
Abstract: The objective of this study was to characterize and identify cassava clones produced in Roraima State, Brazil, for human consumption. There was the planting of six clones of cassava (Aciolina, P o, P o-do-Chile, água Morna, Enxuta and Amazonas), in double rows, following the spacing of 2.0 m x 0.8 m x 0.8 m, total of 8,928 plants ha-1 . It was used randomized blocks experimental design with four replications. At eight months after planting was carried out to harvest the roots, being evaluated for hydrocyanic acid, starch content by the method of hydrostatic balance and artisanal mining, ability to release the film and bark, bark color and flesh color raw. The cassava clones were classified according to HCN content in: Mansi (Enxuta and P o-do-Chile), intermediate (Aciolina and água Morna) and Brava (P o and Amazonas). The starch obtained by the method of hydrostatic balance overestimates the starch content by the method artisanal mining. The Aciolina clone stood out among the clones for human consumption, it is also recommended for industrial use. The P o and Amazonas clones have restrictions for both human consumption and for industrial used.
CA88, a nuclear repetitive DNA sequence identified in Schistosoma mansoni, aids in the genotyping of nine Schistosoma species of medical and veterinary importance
Bahia, Diana;Rodrigues, Nilton B;Araújo, Flávio Marcos G;Romanha, álvaro José;Ruiz, Jer?nimo C;Johnston, David A;Oliveira, Guilherme;
Memórias do Instituto Oswaldo Cruz , 2010, DOI: 10.1590/S0074-02762010000400008
Abstract: ca88 is the first long nuclear repetitive dna sequence identified in the blood fluke, schistosoma mansoni. the assembled s. mansoni sequence, which contains the ca88 repeat, has 8,887 nucleotides and at least three repeat units of approximately 360 bp. in addition, ca88 also possesses an internal ca microsatellite, identified as smbr18. both pcr and blast analysis have been used to analyse and confirm the ca88 sequence in other s. mansoni sequences in the public database. pcr-acquired nuclear repetitive dna sequence profiles from nine schistosoma species were used to classify this organism into four genotypes. included among the nine species analysed were five sequences of both african and asian lineages that are known to infect humans. within these genotypes, three of them refer to recognised species groups. a panel of four microsatellite loci, including smbr18 and three previously published loci, has been used to characterise the nine schistosoma species. each species has been identified and classified based on its ca88 dna fingerprint profile. furthermore, microsatellite sequences and intra-specific variation have also been observed within the nine schistosoma species sequences. taken together, these results support the use of these markers in studying the population dynamics of schistosoma isolates from endemic areas and also provide new methods for investigating the relationships between different populations of parasites. in addition, these data also indicate that schistosoma magrebowiei is not a sister taxon to schistosoma mattheei, prompting a new designation to a basal clade.
An Explicit Rate Bound for the Over-Relaxed ADMM
Guilherme Fran?a,José Bento
Mathematics , 2015,
Abstract: The framework of Integral Quadratic Constraints of Lessard et al. (2014) reduces the computation of upper bounds on the convergence rate of several optimization algorithms to semi-definite programming (SDP). Followup work by Nishihara et al. (2015), applies this technique to the entire family of over-relaxed Alternating Direction Method of Multipliers (ADMM). Unfortunately, they only provide an explicit error bound for sufficiently large values of some of the parameters of the problem, leaving the computation for a general case as a numerical optimization problem. In this paper we provide an exact analytical solution to this SDP and obtain a general and explicit upper bound on the convergence rate of the entire family of over-relaxed ADMM. Furthermore, we demonstrate that it is not possible to extract from this SDP a general bound better than ours. We end with a few numerical illustrations of our result and a comparison between the convergence rate we obtain for the ADMM with known convergence rates for the Gradient Descent.
A geoprocessing approach for studying and controlling schistosomiasis in the state of Minas Gerais, Brazil
Guimar?es, Ricardo José de Paula Souza;Freitas, Corina Costa;Dutra, Luciano Vieira;Scholte, Ronaldo Guilherme Carvalho;Martins-Bedé, Flávia Toledo;Fonseca, Fernanda Rodrigues;Amaral, Ronaldo Santos;Drummond, Sandra Costa;Felgueiras, Carlos Alberto;Oliveira, Guilherme Corrêa;Carvalho, Omar Santos;
Memórias do Instituto Oswaldo Cruz , 2010, DOI: 10.1590/S0074-02762010000400030
Abstract: geographical information systems (gis) are tools that have been recently tested for improving our understanding of the spatial distribution of disease. the objective of this paper was to further develop the gis technology to model and control schistosomiasis using environmental, social, biological and remote-sensing variables. a final regression model (r2 = 0.39) was established, after a variable selection phase, with a set of spatial variables including the presence or absence of biomphalaria glabrata, winter enhanced vegetation index, summer minimum temperature and percentage of houses with water coming from a spring or well. a regional model was also developed by splitting the state of minas gerais (mg) into four regions and establishing a linear regression model for each of the four regions: 1 (r2 = 0.97), 2 (r2 = 0.60), 3 (r2 = 0.63) and 4 (r2 = 0.76). based on these models, a schistosomiasis risk map was built for mg. in this paper, geostatistics was also used to make inferences about the presence of biomphalaria spp. the result was a map of species and risk areas. the obtained risk map permits the association of uncertainties, which can be used to qualify the inferences and it can be thought of as an auxiliary tool for public health strategies.
Assessment of methyl methacrylate genotoxicity by the micronucleus test
Amarildo Mariano de Araújo,Guilherme Rodrigues Alves,Guilherme Trevisan Avan?o,José Luiz Santos Parizi
Brazilian Oral Research , 2013, DOI: 10.1590/s1806-83242013000100006
Abstract: The aim of this study was to evaluate the genotoxic potential of methyl methacrylate (MMA) vapor by simulating standard occupational exposure of 8 hours per day and using the micronucleus test. We used 32 adult male Wistar rats divided into three groups: A - 16 rats exposed to MMA for 8 hours a day, B - Eight rats receiving single subcutaneous doses of cyclophosphamide on the first day of the experiment (positive control), C - Eight rats receiving only water and food ad libitum (negative control). Eight rats from group A and all of the rats from groups B and C were sacrificed 24 hours after beginning the experiment (acute exposure in group A). The remaining animals in group A were sacrificed 5 days after the experiment began (repeated exposure assessment in group A, simulating occupational exposure 40 hours/week). Femoral bone marrow was collected from each rat at the time of sacrifice for use in the micronucleus test. Two slides were completed per animal and were stained with Giemsa staining. Two thousand polychromatic erythrocytes were counted per animal. The Kruskal-Wallis test followed by a multiple comparisons test (Dunn test) was used for statistical analysis. The median number of micronuclei was 7.00 in the group exposed to MMA for 1 day, 2.00 in the group exposed to MMA for 5 days, 9.00 in the group exposed to cyclophosphamide (positive control) and 0.756 in the negative control group (p < 0.0001). MMA was genotoxic when measured after 1 day of exposure but was not evidently genotoxic after 5 days.
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