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Interferências dos pedoambientes nos atributos do solo em uma topossequência de transi??o Campos/Floresta
Campos, Milton César Costa;Ribeiro, Mateus Rosas;Souza Júnior, Valdomiro Severino de;Ribeiro Filho, Mateus Rosas;Oliveira, Ivanildo Amorim de;
Revista Ciência Agron?mica , 2010, DOI: 10.1590/S1806-66902010000400004
Abstract: the pedoenvironmental conditions promote changes in soil properties, so the aim of this work was to study interference of the pedoenvironment on soil properties in a topossequence of the grassland/forest transition in the humaitá region, am. was picked up a topossequence characteristic sequence grassland/forest, then a pathway was established, from a field environment to the natural forest environment. these pedoambients were identified and defined as the expression patterns of vegetation. were collected 20 samples at the representative side of the profiles in each one of the pedoambiental units of the topossequence (top grassland: 0.0-14 and 0.30-0.66 m;low grassland : 0.0-0.15 and 0.27-0.80 m; ecotone zone: 0.0-0.15 and 0.32-0.50 m; forest: 0.0-0.15 m 0.67-100 as a total of 80 samples) being the criteria for sampling depths the coincidence with the surface and subsurface diagnostic horizons determined by the morphological description of the profiles. were performed physical analysis of texture, clay dispersion and flocculation, soil bulk density and particle porosity and hydraulic conductivity. in the chemical analysis were determined ph in water and kcl, ca, mg, k, na and al contents, available p, h + al and organic carbon. the physical and chemical soil were dependent on the pedoambients. with the use of multivariate statistical techniques was possible to distinguish three different environments that are equivalent to three pedoambients.
Spatial variability of soil resistance to penetration and humidity in areas cultivated with cassava in the region of Humaitá, AM = Variabilidade espacial da resistência do solo à penetra o e umidade em áreas cultivadas com mandioca na regi o de Humaitá, AM
Milton César Costa Campos,Ivanildo Amorim de Oliveira,Luís Ant?nio Coutrim dos Santos,Renato Eleotério de Aquino
Agro@mbiente On-line , 2012,
Abstract: Cassava is a regional culture of great importance because of their adaptability and excellent source of protein, on the other hand, the management system is critical to the success of cultivation. Thus, soil preparation is one of the primary steps for planting is done improperly, preventing compaction and loss of physical quality. The resistance to penetration (RSP)has been an important indicator of soil physical quality, to be directly related to plant growth and easy determination. The objective of this work to investigate the spatial variability of soil resistance to penetration (RSP) and the moisture content of soil at different depths in area planted to cassava. The experiment was conducted in a Cambisol. The sample collection points were established by means of a grid of 70 mx 70 m, sampling at the crossing points of the grid with regular spacing of 10 to 10 meters. The RSP and the humidity was measured at depths from 0.0 to 0.15, 0.15 to 0.30 and from 0.30 to 0.45 m. Analyzes were performed exploratory data and geostatistics. The resistance to penetration (RSP) and moisture content showed spatial dependence at all depths studied, except at a depth of 0.30 to 0.45 m of RSP which showed pure nugget effect. The moisture in the soil and the RSP had values with ranges greater than the spacing of the grid, ranging from 15.10 to 67.76 m. = A mandioca é uma cultura de grande importancia regional devido à sua adaptabilidade e excelente fonte de proteína, por outro lado, o sistema de manejo é fundamental para o sucesso do cultivo. Assim, o preparo do solo é uma das etapas primordiais para o plantio seja realizado de forma inadequada, evitando a compacta o e perda da qualidade física. A resistência do solo a penetra o (RSP) tem sido um importante indicador da qualidade física do solo, por ser diretamente relacionado ao crescimento das plantas e de fácil determina o. Objetivou-se com este trabalho investigar a variabilidade espacial da resistência do solo a penetra o (RSP) e do teor de umidade do solo em diferentes profundidades em área cultivada com mandioca. O experimento foi instalado em um Cambissolo Háplico Alítico plíntico. Os pontos de coleta das amostras foram estabelecidos por meio de uma malha de 70 x 70 m, amostrando-se nos pontos de cruzamento da malha, com espa amentos regulares de 10 em 10 m. A RSP e umidade foram avaliadas nas profundidades 0,0–0,15, 0,15–0,30 e 0,30–0,45 m. Foram realizadas análises exploratória dos dados e geoestatística. A resistência do solo a penetra o (RSP) e o teor de umidade apresentaram dependência espacial em to
Decomposition of Arachis pintoi and Hyparrhenia rufa litters in monoculture and intercropped systems under lowland soil
Oliveira Christiane Abreu de,Muzzi Maria Rita Scotti,Purcino Hortênsia Abrantes,Marriel Ivanildo Evódio
Pesquisa Agropecuária Brasileira , 2003,
Abstract: Tropical grasslands under lowland soils are generally underutilized and the litter of forage legumes may be used to recover these degraded pastures. The objective of this work was to study the dynamics of litter decomposition of Arachis pintoi (pinto peanut), Hyparrhenia rufa (thatching grass) and a mixture of both species in a lowland soil. These treatments were analyzed in three areas: grass monoculture, legume monoculture and legume intercropped with the grass during the dry and wet seasons. Litter bags containing the legume, grass or a mixture of both species were incubated to estimate the decomposition rate and microorganism colonization. Decomposition constants (K) and litter half-lives (T1/2) were estimated by an exponential model whereas number of microorganisms in specific media were determined by plate dilution. The decomposition rate, release of nutrients and microorganisms number, especially bacteria, increased when pinto peanut was added to thatching grass, influenced by favorable lignin/N and C/N ratios in legume litter. When pinto peanut litter was incubated in the grass plots, 50% N and P was released within about 135 days in the dry season and in the wet season, the equivalent release occurred within 20 days. These results indicate that A. pintoi has a great potential for nutrient recycling via litter and can be used to recover degraded areas.
A influência da a o coletiva das associa es no poder e no desenvolvimento sociopolítico local, em Tocqueville
José Amorim de Oliveira Júnior
Barbarói , 2006,
Abstract: Este artigo tem por objetivo analisar a influência da coopera o (ocorrida no ambito das associa es locais) na estrutura de poder e no processo de desenvolvimento sociopolítico de pequenas localidades, desenvolvimento este traduzido por dois fen menos: a) a amplia o dos espa os públicos de poder, principalmente por meio da participa o dos cidad os nas associa es locais; b) amplia o da percep o de liberdade e de empoderamento dos atores sociopolíticos locais. Como eixo teórico, adotou-se a obra A democracia na América, de Tocqueville, dialogando-se, quando oportuno, com pensadores modernos e contemporaneos que possam nos auxiliar a compreender a importancia da contribui o de Tocqueville para a compreens o do fen meno do desenvolvimento sociopolítico, a partir da atua o associativa. Abstract In this article we analyze the influence of cooperation (in local association) in the power structure in the process of sociopolitical development of small places, process that is translated for two phenomena: a) growth of public spaces of power, mainly by citizen’s participation in the local associations; b) growth perception about the liberty and the empowerment of sociopolitical local agents. As theoretical axle, it was adopted the A democracia na América, by Tocqueville, dialoging, when appropriate, with thinkers who can help us understand the importance of Tocqueville’s contribution for the study of associativism consequences for the sociopolitical development.
Antioxidant, Iron Chelating and Tyrosinase Inhibitory Activities of Extracts from Talinum triangulare Leach Stem
Ana Paula Oliveira Amorim,Márcia Cristina Campos de Oliveira,Thiago de Azevedo Amorim,Aurea Echevarria
Antioxidants , 2013, DOI: 10.3390/antiox2030090
Abstract: The aim of this work is to evaluate the antioxidant activity against the radical species DPPH, the reducing capacity against Fe II ions, and the inhibitory activity on the tyrosinase enzyme of the T. triangulare. Hydromethanolic crude extract provided two fractions after the liquid/liquid partition with chloroform. The Folin-Ciocalteu method determined the total phenolic content of the crude extract (CE) and the hydromethanolic fraction (Fraction 1), resulting in a concentration of 0.5853 g/100 g for Fraction 1, and 0.1400 g/100 g for the CE. Taking into account the results of the DPPH, the free radical scavenging capacity was confirmed. The formation of complexes with Fe II ions was evaluated by UV/visible spectrometry; results showed that CE has complexing power similar to the positive control ( Gingko biloba extract).The inhibitory capacity of samples against the tyrosinase enzyme was determined by the oxidation of L-DOPA, providing IC 50 values of 13.3 μg·mL ?1 (CE) and 6.6 μg·mL ?1 (Fraction 1). The values indicate that Fraction 1 was more active and showed a higher inhibitory power on the tyrosinase enzyme than the ascorbic acid, used as positive control. The hydromethanolic extract of T. triangulare proved to have powerful antioxidant activity and to inhibit the tyrosinase enzyme; its potential is increased after the partition with chloroform.
Resíduos de sorgo e a mineraliza??o do nitrogênio em LATOSSOLO VERMELHO fase cerrado
Vasconcellos, Carlos Alberto;Marriel, Ivanildo Evodio;Santos, Fredolino Giacomini dos;Magalh?es, Paulo César;Oliveira, Cristiane Abreu de;
Scientia Agricola , 2001, DOI: 10.1590/S0103-90162001000200022
Abstract: management alterations induce significant modifications on organic matter quality and quantity, on n quantity and forms and on the mineralization process. the aim of this work was to study the influence of straw on the n mineralization rates of the n-nh4+ and n-no3 forms during the decomposition of residues of two sorghum genotypes. the experimental design consisted of a 3x2x3 complete block outline, including two soil managements, three cultural residues and two nitrogen levels, with three replications. percolation tubes were prepared with 20 g of soil mixed with 20 g of sand. each tube with soil and sand received 0.1g residual straw from the two sorghum genotypes, with and without 50 mg n kg-1 in the form of ammonium nitrate. a control treatment was maintained without straw in the presence and absence of n. after an initial seven day incubation period, n was extracted weekly, over 49 days, using 100 ml of 0.01 mol l-1 cacl2. the forms n-nh4+ and n-no3- were determined spectroscoptically (uv/vis) in the percolated extracts. n mineralization dependent on sorghum genotype and applied n. sorghum straw influenced time and amount of n mineralized. the n-nh4+/ n-no3- ratio showed variability during the incubation time as influenced by the incorporated residue. that ratio increased up to fifteen days of incubation time and decreased in subsequent periods. without residues the mineralization potential was higher in the n-no3 form.
Three replacement names for species of the subfamily Leiinae (Diptera, Mycetophilidae)
Oliveira, Sarah Siqueira de;Amorim, Dalton de Souza;
Revista Brasileira de Entomologia , 2010, DOI: 10.1590/S0085-56262010000200019
Abstract: new names are proposed for three cases of homonymy in the mycetophilidae subfamily leiinae, one in the genus docosia winnerz, one in leia meigen, and one in tetragoneura winnertz. docosia garretti nom. nov. is proposed for docosia setosa garrett, 1925; leia walkeri nom. nov. for leia bimaculata (walker, 1848); and tetragoneura sasakawai nom. nov. for tetragoneura tibialis sasakawa, 1961. the context of each new name is discussed.
O HERMENEUTA DA GEOGRAFIA ALAGOANA: HOMENAGEM AO GEóGRAFO E PROFESSOR IVAN FERNANDES LIMA / THE HERMENEUTA OF GEOGRAPHY ALAGOANA: HOMAGE TO THE GEOGRAFHER AND PROFESSOR IVAN FERNANDES LIMA.
David Christopher M. de Amorim.,Moisés Calú de Oliveira.
Revista Geográfica Acadêmica , 2008,
Abstract: This biography has as objective main to present the academics of social sciences, in particular, to the futuregeographer, the most famous profile of one of Geographers of the past, the Professor Ivan FernandesLima. Objective also, from the manuscript of the same for geography students, who are renewed thestimulatons and vocation in the performance of these professional futures, having as reference, a professionalwho exactly of the past, more is brought up to date of what never this biography has as objective main toshow the importance of if searching geographer, of the past. This type of research longs for that thegeography students mainly, know and value such geographer.[full text in portuguese]
Hemophilia in childhood: the impact of the disease on parent's participation in their child's education
Tássia de Oliveira Vidal,Fabiane de Amorim Almeida
Einstein (S?o Paulo) , 2008,
Abstract: Objectives: To identify the limitations faced by the hemophiliac child, according to his/her parents, and how they deal with these limitations, and to verify how parents approach the problem of hemophilia with the child as well as their strategies for disciplining that child and their nonhemophiliac children. Methods: An exploratory descriptive research study with a quantitative approach carried out with 20 parents of hemophiliac children seen at the ambulatory of a medium size public hospital in the city of S o Paulo. The data were collected by means of a structured interview, using a form with open-ended and closed questions. Rresults: All the parents (20; 100%) reported talking to their children about hemophilia, especially as to the definition of the disease (19; 46,35%) and the activities that should be avoided (eight; 19.50%). Most of them (17; 85%) also reported talking about hemophilia with their other children. Eighteen parents (90%) restricted participation in sports and physical activities for their hemophiliac child, including at school: 11 (55%) prohibit participation in physical activities, and 12 (60%) ban extracurricular activities. All the parents also reported raising the subject of their child’s hemophilia with the educational professionals at their child’s school. As to discipline, half of them (ten; 50%) use different strategies for disciplining their hemophiliac and non-hemophiliac children. Cconclusions: All the parents are concerned with discussing the subject of hemophilia with the child, his/her siblings, and teachers at school, imposing limitations especially as to participation in sports and/or physical activities. Differences were noted as to the strategies used by the parents for the discipline of their hemophiliac and non-hemophiliac children.
Evaluation of Storage Potential of Jatropha curcas L. Seeds  [PDF]
Henrique Duarte Vieira, Alessandra Olmo Dardengo, Márcia Terezinha Ramos de Oliveira, Pedro Amorim Berbert, Bruno Borges Deminicis
American Journal of Plant Sciences (AJPS) , 2017, DOI: 10.4236/ajps.2017.812204
Abstract: Ensuring the physiological quality of the seeds depends on storage conditions. Since their quality cannot be improved, good conditions during this period will contribute on keeping them viable for a longer time, delaying the deterioration process. In the present study, the effect of five storage periods in a refrigerated chamber at 15 ± 1, on the seeds viability during 30, 60, 90, 150 and 240 days of storage in glass containers was evaluated. Four replicates of twenty-five seeds per treatment were used and the data were compared by regression equation. It verified that, regardless of the storage time, the seeds when submitted to the drying temperature of 35 and 40 showed a significant linear reduction of germination, GSI and seed vigor after storage.
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