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Search Results: 1 - 10 of 32477 matches for " Ayrton Luiz Urizzi Martins "
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Genetic Variability of Pumpkin Landraces in Brazilian Amazon  [PDF]
Lúcia Helena Pinheiro Martins, Hiroshi Noda, Maria Teresa Gomes Lopes, Maria Silvesnizia Paiva Mendon?a, Ayrton Luiz Urizzi Martins
Agricultural Sciences (AS) , 2016, DOI: 10.4236/as.2016.712075
Abstract: The family farm of the Upper Solim?es region has maintained the great genetic variability of the pumpkin (Cucurbita maxima Duchesne) by the in situ conservation of the landraces which are widely used as human food. The aim of this study was to estimate the current level of genetic variability of pumpkin landraces by means of estimation techniques of genetic parameters. Landraces areas samples were the family farming production units located in floodplains ecosystems of Benjamin Constant (Upper Solim?es River) and Iranduba (Lower Solim?es River), Amazonas. The split-plot designs were adopted at the treatments where the main plots were the five pumpkin landraces and one commercial cultivar. Each landrace was obtained six half sib families distributed in the sub-plots. Among the results of this study, it can be concluded that the genetic variation within the each landrace is greater than the genetic variation among the landraces. The qualitative morphological characteristics bring together half-sib families collected in geographically distant locations. It can be concluded that, through the estimation of genetic parameters, there is genetic variability among local cultivars collected in family farming of Benjamin Constant and Iranduba, Amazonas.
Agroecosystems, Landscapes and Knowledge of Family Farmers from Arama?á Island, Upper Solim?es Region, Amazon  [PDF]
Ayrton Luiz Urizzi Martins, Sandra do Nascimento Noda, Hiroshi Noda, Lúcia Helena Pinheiro Martins, Elisabete Brocki
Agricultural Sciences (AS) , 2018, DOI: 10.4236/as.2018.910095
Abstract: The family farmer’s knowledge about floodplains agroecosystems dynamics is part of agrobiodiversity conservation cognitive strategies. This is because the conservation in floodplains is conditioned by the ecophysiological adaptation to the period and flood gradient of the agricultural lands and by the transformations promoted in the environment by the waters pulse. The aim of this study was to understand the cognitive strategies expressed in the organized meaning of agroecosystems by local knowledge, related to the geomorphological dynamics of the Aramaçá Island, Amazonas, Brazil. In this research, the Case Study and Ethnoecology were adopted as approach, taking the systemic complexity paradigm as a theoretical framework. To do so, it was necessary to establish a dialogue with the local knowledge through multitemporal analyses of satellite images, historical series of hydrological data, as well as cartographic documents of the locality. The floodplains amphibian mark, as a living organism in permanent autopoietic process, seems to be imprinted in the family farmer’s knowledge. In order to live in the floodplains and of floodplains, it is necessary, above all, to develop a cognitive ability capable of understanding not only the rivers action on the lands, but also that of the lands on the rivers as well. Therefore, the geomorphological dynamics in the spaces managed by the family farmers impose on them, risks and uncertainties, demanding from them strategies that allow knowing and dealing with this complexity.
Sele??o de genótipos de piment?o resistentes à Xanthomonas campestris pv. vesicatoria (Doidge) Dye. sob condi??es naturais de infec??o
Noda, Hiroshi;Machado, Francisco Manoares;Martins, Ayrton Luiz Urizzi;
Acta Amazonica , 2003, DOI: 10.1590/S0044-59672003000300003
Abstract: the cultivation of pepper is decling in the floodplain ecosystem of the solim?es river, near manaus, amazonas, brazil, because the frequence of severe epidemics of bacterial spot caused by x. campestris pv. vesicatoria (doidge) dye. the inpa pepper improvement program for resistance to x. campestris pv. vesicatoria was initiated in 1976. in this paper is reported results of three experiments in upland and floodplain ecosystems in amazonas, in which f13 and f14 progenies of a interspecific cross of capsicum annuum and c. chinense (named hp-12) were evaluated for resistance to x. campestris pv. vesicatoria and fruit yield potential under natural conditions of plant infection. when the host population is composed of resistant and suceptible cultivars epidemic patterns fit the monomolecular model of disease progress and high levels of resistance, conferred by a genotype, were due to its capacity to restrict the velocity of disease progress. the progenies selected by the program have higher levels of resistance to the pathogen and higher yield potential than control, the susceptible cultivar cascadura ikeda. the potential for fruit yield is related to the host's level of resistance. also c. chinense is an important source of genetic resistance to x. campestris pv. vesicatoria for the pepper genetic improvement program.
Landscapes and ethno-knowledge in the Ticuna and Cocama agriculture at upper River Solim es, Amazonas, Brazil
Sandra do Nascimento Noda,Ayrton Luiz Urizzi Martins,Hiroshi Noda,Antonia Ivanilce Castro da Silva
Boletim do Museu Paraense Emílio Goeldi. Ciências Humanas , 2012,
Abstract: The units of landscape in the Cocama and Ticuna agriculture, in the upper River Solim es, are characterized by productionarrangements and management of natural resources. This paper aims to characterize these agro-ecological based practices,the landscaped results and its regional applicability. The survey was conducted in Novo Paraíso, at Bom Intento Island,and in Nova Alian a, both located in the municipality of Benjamin Constant, state of Amazonas, Brazil. The social andeconomic organization of Ticuna and Cocama Peoples is founded on kinship and communal ownership of natural resources,including spaces for gathering. Family units, despite their weak linkages with the market and its rules, have in the logicof reciprocity the motivation for the production, transmission and management of resources and factors of production.The landscapes are reconstructed by agro-ecological production derived from ethno-knowledge and correspond to theinherent processes of management and conservation of flora and fauna. This process allows the existence of compleximbrications of constantly changing landscapes in which forms of production are recreated for sufficiency and sustainability.
Molecular Study of the Genetic Variability of Pumpkins Landraces from Brazilian Amazon  [PDF]
Lúcia Helena Pinheiro Martins, Maria Teresa Gomes Lopes, Hiroshi Noda, Pedro de Queiroz Costa Neto, Ayrton Luiz Urizzi Martins, Fabíola Viana de Almeida, Liane Cristine Rebou?as Demosthenes
Agricultural Sciences (AS) , 2018, DOI: 10.4236/as.2018.94035
Abstract: The Cucurbita maxima Duchesne is a vegetable crop plant cultivated and maintained by traditional Amazon communities, Brazil. The situation is worsened by the possibility of disappearance of local populations and genetic variability of this specie, taking into account the today changes promoted in family farming. The aim of this study was to estimate the current levels of genetic variability of local cultivars through the use of molecular markers (Amplified Fragment Length Polymorphism—AFLP). We chose to collect in two distinct micro regions in order to identify possible influences of geographic isolation and different levels of market requirements in the conservation of the genetic variability of the C. maxima. For the molecular analysis, bulk samples of fresh leaves of 15 plants/half-sibling family were collected in paper bags. There were 34 samples from the half-sib families. The analysis of the results half-sib obtained by methods of estimation of genetic variation by molecular markers shows that the forms of cultivation and management adopted by family farmers maintain the identities of the local/landraces (native cultivars) and, at the same time, the levels of diversity for the assurance of adaptability macro-environmental.
Multivariate optimization of analytical methodology and a first attempt to an environmental risk assessment of β-blockers in hospital wastewater
Wilde, Marcelo L.;Kümmerer, Klaus;Martins, Ayrton F.;
Journal of the Brazilian Chemical Society , 2012, DOI: 10.1590/S0103-50532012005000035
Abstract: this preliminary study evaluated an assessment of the risks arising from environmental exposure to β-blockers from wastewater of an university hospital (university hospital of santa maria (husm), rio grande do sul state, brazil). propranolol showed the highest risk quotient (0.56). the occurrence of β-blockers was evaluated using an analytical procedure spe-hplc-fld (solid phase extraction-high performance liquid chromatography with fluorescence detection), optimizing the variables sample ph, water ph, and methanol:acetonitrile:formic acid ratio of the elution stage. the average concentrations of atenolol, metoprolol and propranolol for a sampling period of one week were 2.45 ± 1.14, 4.67 ± 1.63 and 0.70 ± 0.88 μg l-1 in the 'emergence' sewage; 0.95 ± 0.68, 0.70 ± 0.33 and 0.315 ± 0.62 μg l-1 in the 'husm general' sewage and 1.26 ± 0.47, 1.27 ± 0.35 and 0.56 ± 0.47 μg l-1 in the 'receiving waters', the receptor stream of the effluents, respectively. propranolol showed an mec/pnec ratio > 1, and thus requires more attention in terms of toxicity. the occurrence of β-blockers and the associated environmental risks demonstrate the need of a more efficient treatment system for the hospital wastewater.
Maria Leopoldina Keller do Canto,Ayrton Figueiredo Martins
Ciência Florestal , 1996,
Abstract: Com o objetivo de desenvolver metodologia analítica para a determina o de molibdênio (fra o disponível), em amostras de solo e de fertilizante organico, aperfei oou-se procedimento que utiliza solu o de acetato de am nio 1,0 mol.L-1 como meio extrator, pH 6,5 a 7,0, agita o por 7 horas e medida por Espectrometria de Absor o At mica em Forno de Grafite (GFAAS, temperatura de atomiza o de 2650 °C, limite de detec o de 2,0 ng Mo. mL-1). Palavras-chave: Solo, fertilizante organico , molibdênio
A tomada de decis?o em recursos humanos com dados replicados e inconsistentes: uma aplica??o da teoria dos conjuntos aproximativos
Couto, Ayrton Benedito Gaia do;Gomes, Luiz Flavio Autran Monteiro;
Pesquisa Operacional , 2010, DOI: 10.1590/S0101-74382010000300009
Abstract: this study deals about decision-making with replicated and inconsistent data, relating to the universe of human resources, within a domestic financial institution. replication occurs because of technical and/or economic questions, and seeks to meet corporate and departmental requirements of such an institution. as research methodology, direct observation of such inconsistencies was used as well as a simulation based on actual data which would reflect replication with inconsistencies. the authors introduce an application of a multi-criteria method to render the decision-making process rational, and was transformed into an element that stimulated this study. the method used was the rough set theory (rst). an algorithm was developed to indicate the equivalence relations, lower and higher approximations, borderline region, accuracy measure, reducts and core and was subsequently implemented into a software.
Foreign Ownership, Employment and Wages in Brazil: Evidence from Acquisitions, Divestments and Job Movers  [PDF]
Pedro S. Martins, Luiz A. Esteves
Technology and Investment (TI) , 2015, DOI: 10.4236/ti.2015.61003
Abstract: How much do developing countries benefit from foreign investment? We contribute to this question by comparing the employment and wage practices of foreign and domestic firms in Brazil, using detailed matched firm-worker panel data. In order to control for unobserved worker differences, we examine both foreign acquisitions and divestments and worker mobility, including the joint estimation of firm and worker fixed effects. We find that changes in ownership do not tend to affect wages significantly, a result that holds both at the worker- and firm-levels. However, divestments are related to large job cuts, unlike acquisitions. On the other hand, movers from foreign to domestic firms take larger wage cuts than movers from domestic to foreign firms. Moreover, on average, the fixed effects of foreign firms are considerably larger than those of domestic firms, while worker selection effects are relatively small.
Avalia o da Suscetibilidade a Processos Erosivos e Movimentos de Massa: Decis o Multicriterial Suportada em Sistemas de Informa es Geográficas
Luiz Carlos Pittol Martini,Antonio Ayrton Auzani Uberti,Luiz Fernando Scheibe,Jucinei José Comin
Geologia USP : Série Científica , 2006,
Abstract: Este trabalho apresenta um conjunto de procedimentos adotados na avalia o da suscetibilidade a processos erosivos emovimentos de massa na área de influência direta da usina hidrelétrica Quebra-Queixo, localizada no rio Chapecó, SantaCatarina. Para essa avalia o, empregaram-se recursos de decis o multicriterial suportada em Sistema de Informa es Geográficas(SIG). Para compor a decis o multicriterial foram selecionados os critérios relevo, solo e cobertura vegetal, os quaisforam subdivididos em onze fatores predominantes. Na associa o dos fatores utilizou-se o método da combina o linearponderada, com pesos e escores atribuídos por consenso técnico. O principal resultado obtido na aplica o dos procedimentosfoi um mapa temático com a distribui o espacial das classes de suscetibilidade a processos erosivos e movimentos demassa no entorno do reservatório.
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