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Search Results: 1 - 10 of 217950 matches for " Carlos Rogério de;Curi "
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Hydropedology
Mello, Carlos Rogério de;Curi, Nilton;
Ciência e Agrotecnologia , 2012, DOI: 10.1590/S1413-70542012000200001
Abstract: pedology consists of a sub-area of soil science that studies the soil and its origin as well as its inter-relationship with the landscape. hydrology is the science that studies the water in nature in its different mediums (atmosphere, soil and rock), using the watershed as a reference for analysis of the water dynamics and also its interaction with the landscape. the relationship between these two branches of knowledge has been the object of debate and analysis in recent years, contributing to the creation of a multidisciplinary science, which seeks to integrate the respective fields of research. as such, for hydrology, pedology has been fundamental for enabling a foundation for the processes associated to the generation of runoff and groundwater recharge, especially concerning the micro-morphological analysis of the soil and the horizons which may impede the water flow, and their relationships with the soil structure. for pedology, hydrology can be fundamental to the understanding of the soil formation processes in the different landscapes, in the context of materials deposition as well as the shaping of the relief, as consequence of the soil-climate-drainage interaction, and its importance for pedogenesis. therefore, the understanding and the deepening of the pedologic analyses, on a microscale and in toposequence in a specific landscape, and its insertion in the theories of hydrology will allow the development of more realistic, physically based hydrological models and less parameterization dependence, this now being one of the most important challenges for the hydrologist.
Simula??o da variabilidade espacial da eros?o hídrica em uma sub-bacia hidrográfica de Latossolos no sul de Minas Gerais
Silva, Ant?nio Marciano da;Mello, Carlos Rogério de;Curi, Nilton;Oliveira, Polyanna Mara de;
Revista Brasileira de Ciência do Solo , 2008, DOI: 10.1590/S0100-06832008000500033
Abstract: simulation of water erosion spatial distribution is an important tool for soil conservation planning in watersheds, being an important application of the universal soil loss equation (usle) using interpolation principles, such as geostatistics. this study aimed to simulate spatial distribution of water erosion in a watershed of the alto rio grande (mg) region, applying geostatistical tools for mapping, considering different land use scenarios. water erosion was estimated by the usle applied to grid cells, weighing pedologic units and land use distribution in each cell. the topographical factor (ls) of the cells was obtained based on a digital elevation model of the sub-watershed, identifying length and main flow direction. mean annual rainfall erosivity in the region is 8,030 mj mm ha-1 h-1 year-1 and the underlying soil erodibility values were based on data from the literature. mapping was carried out considering the current land uses in the entire watershed, where eucalyptus was grown on degraded soils, grasses planted as pasture and corn tilled conventionally. under the current land uses, soil losses from the watershed were not relevant, except in areas covered with eucalyptus and grass on cambisol (inceptisol). in all simulations, the highest soil losses were verified on the eastern side of the watershed, especially for eucalyptus and conventional corn on cambisol and dystrophic red-yellow latosol (oxisol), where special soil conservation techniques are needed.
Sea surface temperature (SST) and rainfall erosivity in the Upper Grande River Basin, southeast Brazil
Mello, Carlos Rogério de;Norton, Lloyd Darrell;Curi, Nilton;Yanagi, Silvia Nazaré Monteiro;
Ciência e Agrotecnologia , 2012, DOI: 10.1590/S1413-70542012000100007
Abstract: relationships between regional climates and oceanic and atmospheric anomalies are important in understanding the rainfall regime of a given region. this work aimed to analyze rainfall erosivity in the upper grande river basin, southern minas gerais state, brazil; namely the two most representative environments, the mantiqueira range (mr) and the plateau of campos das vertentes (pcv). these areas can be affected by the el ni?o southern oscillation (enso) phenomena, which can be evaluated by indicators such as sea surface temperature (sst) for the ni?o 3.4 region. rainfall erosivity was calculated for individual rainfall events from january, 2006 to december, 2010. pearson's coefficient of correlation was used to evaluate the relationships between rainfall variables and sst. the coefficients of correlation were significant for both sub-regions. correlations between the rainfall variables and negative oscillations of sst were also significant, especially in the mr sub-region, however, the person's coefficients were lower than those obtained for the sst positive oscillations. these results demonstrate that el-ni?o phenomenon can be considered an important factor in the intense rainfall behavior of the upper grande river basin.
Alternative genotyping method for the single nucleotide polymorphism A2959G (AF159246) of the bovine CAST gene
Curi, Rogério Abdallah;Chardulo, Luis Artur Loyola;Silveira, Ant?nio Carlos;Oliveira, Henrique Nunes de;
Pesquisa Agropecuária Brasileira , 2008, DOI: 10.1590/S0100-204X2008000500014
Abstract: the objective of this work was to genotype the single nucleotide polymorphism (snp) a2959g (af159246) of bovine cast gene by pcr-rflp technique, and to report its use for the first time. for this, 147 bos indicus and bos taurus x bos indicus animals were genotyped. the accuracy of the method was confirmed through the direct sequencing of pcr products of nine individuals. the lowest frequency of the meat tenderness favorable allele (a) in bos indicus was confirmed. the use of pcr-rflp for the genotyping of the bovine cast gene snp was shown to be robust and inexpensive, which will greatly facilitate its analysis by laboratories with basic structure.
Levantamento pedológico e sistema de informa??es geográficas naavalia??o do uso das terras em sub-bacia hidrográfica de Minas Gerais
Menezes, Michele Duarte de;Curi, Nilton;Marques, Jo?o José;Mello, Carlos Rogério de;Araújo, Alexandre Romeiro de;
Ciência e Agrotecnologia , 2009, DOI: 10.1590/S1413-70542009000600013
Abstract: the land agricultural suitability is a technical classification that identifies the agricultural potential of land use, considering the soil limitations at differential management levels from the information generated in a pedologic survey. the cross reference of data involving land agricultural suitability and land use in geographical information system (gis) is an adequate tool for planning, because it allows to determine the inadequacy between land use and land agricultural suitability, giving bases to sustainable exploration. therefore, we evaluated in this work the land agricultural suitability and the current use of the land mediated by satellite images and field observations, for the identification of permanent preservation areas (ppas) in a small watershed from alto rio grande basin - mg. based on soil survey, the utilization of remote sensing, by means of satellite images, in association with gis, constitutes adequate tools to evaluate the land suitability and current use, and allows monitoring areas of the small watershed. the pedologic survey supplied a secure and real basis for this purpose and with the help of geoprocessing tools, the resulting maps had better quality and represented with accuracy the different natural environments in the landscape of the hydrographic small watershed. we observed a dominance of less intensive land use in relation to the agricultural suitability classes found here. the permanent preservation areas (ppas) are receiving a variety of agricultural uses, which characterizes an inadequacy between the environmental legislation and the current land use.
Potencial erosivo da chuva no vale do rio doce, regi?o centro leste do estado de Minas Gerais: primeira aproxima??o
Oliveira, Flávio Pereira de;Silva, Marx Leandro Naves;Curi, Nilton;Silva, Mayesse Aparecida da;Mello, Carlos Rogério de;
Ciência e Agrotecnologia , 2009, DOI: 10.1590/S1413-70542009000600016
Abstract: among the climatic factors that interfere in water erosion, precipitation, expressed by the rainfall erosivity, is of great importance. therefore, its knowledge becomes fundamental for the recommendation for soil management and conservation practices that seek the reduction of water erosion. in that context, the objectives of this work were: a) to determine the rainfall erosivity and its distribution at rio doce valley, minas gerais state, for nine sub-regions, b) to estimate the monthly ei30 index in the period from 1969 to 2005 for ferros and guanh?es counties, and c) to determine the return periods of the monthly and yearly erosivity indexes. the average erosivity value obtained was 12.913 mj mm ha-1 h-1 year-1, being classified as very high. among the sub-regions, the erosivity values varied from 8.243 to 26.676 mj mm ha-1 h-1 year-1. the critical periods in relation to water erosion due to the occurrence of erosive rains are january-march and november-december, contributing with 88.6% of the annual erosivity. from april to october, the occurrence of critical erosivity practically does not exist. the estimated individual maximum values for the return periods of 1, 10, 50, and 150 years were of 5.508, 15.534, 18.110, 19.632, and 5.542, 17.653, 20.954, 22.931 mj mm ha-1 h-1 year1 for ferros and guanh?es, respectively. the determination of the erosivity values throughout the year allows to identify the months in which the risks of soil and water losses are higher, which is important for planning the conservation practices.
Erosividade mensal e anual da chuva no Estado de Minas Gerais
Mello, Carlos Rogério de;Sá, Marcos Aurélio Carolino de;Curi, Nilton;Mello, José Marcio de;Viola, Marcelo Ribeiro;Silva, Ant?nio Marciano da;
Pesquisa Agropecuária Brasileira , 2007, DOI: 10.1590/S0100-204X2007000400012
Abstract: this work aimed to map monthly and annual rainfall erosivity (ei30) mean, to analyze rainfall erosivity distribution, during rainfall season, and to identify rainfall erosivity zones in minas gerais state, brazil. daily pluviometric data from 248 weather stations dispersed in the state were used to determine the fournier′s rainfall coefficient (rc). based on the relation ei30 x rc obtained for some locations, ei30 was calculated for each weather station. geostatistical tools were applied to map ei30 and pluviometric data. minas gerais comprises three zones with annual rainfall erosivity varying from 5,000 to 12,000 mj mm ha-1 year-1: medium-high erosivity, for central, northeastern and part of zona da mata; high, for triangulo mineiro (extreme of the region), and part of northeast and south of state; and very high, for most part of triangulo mineiro, alto paranaíba, northwest and east of state. rainfall erosion behavior has not presented relation with latitude and longitude, and was influenced by orographic effect and weather characteristics of each region.
Genetic polymorphisms related to meat traits in purebred and crossbred Nelore cattle
Curi, Rogério Abdallah;Fortes, Marina Rufino Salinas;Chardulo, Luis Artur Loyola;Silveira, Antonio Carlos;Arrigoni,rio De Beni;Martins, Cyntia Ludovico;Assump??o, Mayra Elena Ortiz D' Avila;Oliveira, Henrique Nunes de;
Pesquisa Agropecuária Brasileira , 2009, DOI: 10.1590/S0100-204X2009001200015
Abstract: the objective of this work was to estimate the allelic and genotypic frequencies of cast/xmni, a calpastatin gene polymorphism, and capn530, a calpain 1 large subunit gene polymorphism, in different beef genetic groups (nelore and nelore x bos taurus), and to investigate associations between these polymorphisms and carcass and meat traits. three hundred animals - comprising 114 nelore, 67 angus x nelore, 44 rubia gallega x nelore, 41 canchim, 19 brangus three-way cross and 15 braunvieh three-way cross- were genotyped by pcr-rflp and phenotyped for rib-eye area (rea), back-fat thickness (bt), intramuscular fat (if), shear force (sf) and myofibrillar fragmentation index (mfi). the occurrence of the two alleles of the cast/xmni and capn530 single nucleotide polymorphisms (snps) in a b. indicus breed, which permitted association studies in purebred and crossbred nelore cattle, was first shown in the present work. no relationship was found between the cast or capn1 snps and growth-related traits (rea) or fat deposition (bt and if), since calpastatin and μ-calpain are not physiologically involved with these traits. moreover, the association results between genotypes and aged meat tenderness (assessed by sf and mfi) showed that these markers are useless in assisted selection for purebred nelore and their crosses with b. taurus.
Mitochondrial DNA of Nellore and European x Nellore crossing cattle of high performance
Curi, Rogério Abdallah;Mota, Lígia Souza Lima Silveira da;Silveira, Ant?nio Carlos;
Pesquisa Agropecuária Brasileira , 2007, DOI: 10.1590/S0100-204X2007000800019
Abstract: the objective of this work was to evaluate, through a polymorphism in the nd5 gene of the bovine mitochondrial dna, the frequency of bos taurus indicus mtdna individuals in a sample of nellore purebred origin animals (n = 69) and crossbred animals originated from crosses of european sires and nellore purebred origin females (n = 275). only 2.26% (8/354) of the animals presented bos taurus indicus mtdna. the high frequency of bos taurus taurus mtdna in these animals can be a consequence of selection, once the animals studied are originated from selected lineages of high performance for meat production.
Hipertens?o arterial experimental e prenhez em ratas: uso do modelo Goldblatt I (1 rim - 1 clipe)
Dias, Rogério;Trindade, José Carlos Souza;Rudge, Marilza Vieira Cunha;Curi, Paulo Roberto;
Revista Brasileira de Ginecologia e Obstetrícia , 1999, DOI: 10.1590/S0100-72031999000400005
Abstract: purpose: to develop an experimental model in rats to study the interaction between hypertension and pregnancy. methods: the present experiment was divided into 5 periods: adaptation (2 weeks), surgical procedures (1 week), hypertension development (6 weeks), mating and blood pressure stabilization (6 weeks), and gestational period (3 weeks). a total of 82 animals in reproductive age, weighing from 180 to 240 g, were used. they were randomly assigned to the 4 different groups (control, handled, nephrectomy and hypertension) and renal hypertension was produced by a controlled constriction of the main left renal artery, according to the technique described by goldblatt, and contralateral nephrectomy (goldblatt i - one kidney, one clip hypertension). they were studied at 15 precise moments. afterwards, periodic blood pressure determinations were made by the tail plethysmographic method. results: pregnancy caused a fall in blood pressure levels in the rat. conclusion: the experimental model was adequate for the purposes of the study, since it proved to be efficient in producing hypertension.
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