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Registro Completo |
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Biblioteca(s): |
Embrapa Unidades Centrais. |
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Data corrente: |
20/02/2014 |
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Data da última atualização: |
20/02/2014 |
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Tipo da produção científica: |
Artigo em Anais de Congresso |
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Autoria: |
SOUZA, G. da S. e; GOMES, E. G. |
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Afiliação: |
GERALDO DA SILVA E SOUZA, SGE; ELIANE GONCALVES GOMES, SGE. |
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Título: |
Scale of operation, allocative inefficiencies and separability of inputs and outputs in agricultural research. |
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Ano de publicação: |
2013 |
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Fonte/Imprenta: |
In: SIMPÓSIO BRASILEIRO DE PESQUISA OPERACIONAL, 45., 2013, Natal. "A Pesquisa Operacional na busca de eficiência nos serviços publicos e/ou privados". Rio de Janeiro: Sobrapo, 2013. |
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Páginas: |
p. 399-415 |
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Idioma: |
Inglês |
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Conteúdo: |
In this article we consider some properties of concern for research production at Embrapa. We apply statistical tests to address questions related to the scale of operation, the presence of allocative inefficiencies and separability of inputs and outputs. The production process is assessed by nonparametric methods with the use of Data Envelopment Analysis. The period under analysis is 2002-2009. We conclude that Embrapa’s technology frontier shows variable returns to scale, is allocative efficient in general and is separable in inputs and outputs. These characteristics justify the company policy of adopting a VRS solution and the aggregation of output variables. Scale inefficiencies are the basis for further input congestion studies. |
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Palavras-Chave: |
DEA; Eficiency. |
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Thesaurus Nal: |
agricultural research. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/97874/1/Scale-of-operation-allocative.pdf
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Marc: |
LEADER 01409nam a2200169 a 4500
001 1980754
005 2014-02-20
008 2013 bl uuuu u00u1 u #d
100 1 $aSOUZA, G. da S. e
245 $aScale of operation, allocative inefficiencies and separability of inputs and outputs in agricultural research.$h[electronic resource]
260 $aIn: SIMPÓSIO BRASILEIRO DE PESQUISA OPERACIONAL, 45., 2013, Natal. "A Pesquisa Operacional na busca de eficiência nos serviços publicos e/ou privados". Rio de Janeiro: Sobrapo$c2013
300 $ap. 399-415
520 $aIn this article we consider some properties of concern for research production at Embrapa. We apply statistical tests to address questions related to the scale of operation, the presence of allocative inefficiencies and separability of inputs and outputs. The production process is assessed by nonparametric methods with the use of Data Envelopment Analysis. The period under analysis is 2002-2009. We conclude that Embrapa’s technology frontier shows variable returns to scale, is allocative efficient in general and is separable in inputs and outputs. These characteristics justify the company policy of adopting a VRS solution and the aggregation of output variables. Scale inefficiencies are the basis for further input congestion studies.
650 $aagricultural research
653 $aDEA
653 $aEficiency
700 1 $aGOMES, E. G.
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Registro original: |
Embrapa Unidades Centrais (AI-SEDE) |
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Registro Completo
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Biblioteca(s): |
Embrapa Amazônia Ocidental; Embrapa Florestas. |
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Data corrente: |
11/01/2021 |
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Data da última atualização: |
10/02/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
B - 3 |
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Autoria: |
RAMOS, S. L. F.; DEQUIGIOVANNI, G.; LOPES, M. T. G.; AGUIAR, A. V. de; LOPES, R.; VEASEY, E. A.; MACEDO, J. L. V. de; ALVES-PEREIRA, A.; FRAXE, T. de J. P.; WREGE, M. S.; GARCIA, J. N. |
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Afiliação: |
Santiago Linorio Ferreyra Ramos, Universidade Federal do Amazonas; Gabriel Dequigiovanni, Centro Universitário UNIVEL; Maria Teresa Gomes Lopes, Universidade Federal do Amazonas; ANANDA VIRGINIA DE AGUIAR, CNPF; RICARDO LOPES, CPAA; Elizabeth Ann Veasey, ESALQ; JEFERSON LUIS VASCONCELOS DE MACEDO, CPAA; Alessandro Alves-Pereira, UNICAMP; Therezinha de Jesus Pinto Fraxe, Universidade Federal do Amazonas; MARCOS SILVEIRA WREGE, CNPF; José Nivaldo Garcia, ESALQ. |
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Título: |
Genetic structure in populations of Euterpe precatoria Mart. in the Brazilian Amazon. |
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Ano de publicação: |
2021 |
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Fonte/Imprenta: |
Frontiers in Ecology and Evolution, v, 8, article 603448, Jan. 2021. |
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DOI: |
10.3389/fevo.2020.603448 |
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Idioma: |
Inglês |
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Conteúdo: |
Euterpe precatoria is a palm tree belonging to the Arecaceae family, occurring inWestern and Central Brazilian Amazonia. Its fruit, which is very appreciated in the Amazon region, produces pulp that is consumed in fresh form. Its production is carried out almost exclusively by extractive farmers. In order to establish adequate strategies to sustain this genetic resource, we need knowledge about the diversity and genetic structure in natural populations. This study aimed to evaluate the influence of geographic distance on genetic structure in the main extractive populations of E. precatoria in the Brazilian Amazon. Leaves from 377 plants were collected in 19 populations located in 16 municipalities in the State of Amazonas and three in the State of Rondônia. Twelve microsatellite loci were used to genotype the plants. The diversity and genetic structure among populations were estimated. The average number of alleles per locus was 5.97. The observed heterozygosity means (HO) were higher than expected (HE) at the population level (HO = 0.72, HE = 0.66) and fixation index (f = -0.100) was negative. The FST value (0.1820) and the AMOVA results (8 = 0.1796) showed population structure. The populations were clustered into three groups (K = 3) in the Bayesian analysis. The Discriminant Analysis of Principal Components (DAPC) confirmed eight clusters, with the populations close to those identified by the Bayesian analysis. The geographic differentiation was confirmed by the groupings obtained in the Structure analysis and the DACP function. Information related to phenotypic, genetic and environmental characterization of populations is important to guide conservation and management strategies and the formulation of public species management policies in Amazonia. MenosEuterpe precatoria is a palm tree belonging to the Arecaceae family, occurring inWestern and Central Brazilian Amazonia. Its fruit, which is very appreciated in the Amazon region, produces pulp that is consumed in fresh form. Its production is carried out almost exclusively by extractive farmers. In order to establish adequate strategies to sustain this genetic resource, we need knowledge about the diversity and genetic structure in natural populations. This study aimed to evaluate the influence of geographic distance on genetic structure in the main extractive populations of E. precatoria in the Brazilian Amazon. Leaves from 377 plants were collected in 19 populations located in 16 municipalities in the State of Amazonas and three in the State of Rondônia. Twelve microsatellite loci were used to genotype the plants. The diversity and genetic structure among populations were estimated. The average number of alleles per locus was 5.97. The observed heterozygosity means (HO) were higher than expected (HE) at the population level (HO = 0.72, HE = 0.66) and fixation index (f = -0.100) was negative. The FST value (0.1820) and the AMOVA results (8 = 0.1796) showed population structure. The populations were clustered into three groups (K = 3) in the Bayesian analysis. The Discriminant Analysis of Principal Components (DAPC) confirmed eight clusters, with the populations close to those identified by the Bayesian analysis. The geographic differentiation was confirmed by the groupings... Mostrar Tudo |
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Palavras-Chave: |
Açaí do Amazonas; Diversidade genética; Estrutura genética; Genetic diversity; Genetic structure; Microsatélite; Microsatellites. |
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Thesaurus NAL: |
Arecaceae; Euterpe precatoria. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/220109/1/Ananda-fevo-08-603448.pdf
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Marc: |
LEADER 02851naa a2200361 a 4500
001 2129168
005 2021-02-10
008 2021 bl uuuu u00u1 u #d
024 7 $a10.3389/fevo.2020.603448$2DOI
100 1 $aRAMOS, S. L. F.
245 $aGenetic structure in populations of Euterpe precatoria Mart. in the Brazilian Amazon.$h[electronic resource]
260 $c2021
520 $aEuterpe precatoria is a palm tree belonging to the Arecaceae family, occurring inWestern and Central Brazilian Amazonia. Its fruit, which is very appreciated in the Amazon region, produces pulp that is consumed in fresh form. Its production is carried out almost exclusively by extractive farmers. In order to establish adequate strategies to sustain this genetic resource, we need knowledge about the diversity and genetic structure in natural populations. This study aimed to evaluate the influence of geographic distance on genetic structure in the main extractive populations of E. precatoria in the Brazilian Amazon. Leaves from 377 plants were collected in 19 populations located in 16 municipalities in the State of Amazonas and three in the State of Rondônia. Twelve microsatellite loci were used to genotype the plants. The diversity and genetic structure among populations were estimated. The average number of alleles per locus was 5.97. The observed heterozygosity means (HO) were higher than expected (HE) at the population level (HO = 0.72, HE = 0.66) and fixation index (f = -0.100) was negative. The FST value (0.1820) and the AMOVA results (8 = 0.1796) showed population structure. The populations were clustered into three groups (K = 3) in the Bayesian analysis. The Discriminant Analysis of Principal Components (DAPC) confirmed eight clusters, with the populations close to those identified by the Bayesian analysis. The geographic differentiation was confirmed by the groupings obtained in the Structure analysis and the DACP function. Information related to phenotypic, genetic and environmental characterization of populations is important to guide conservation and management strategies and the formulation of public species management policies in Amazonia.
650 $aArecaceae
650 $aEuterpe precatoria
653 $aAçaí do Amazonas
653 $aDiversidade genética
653 $aEstrutura genética
653 $aGenetic diversity
653 $aGenetic structure
653 $aMicrosatélite
653 $aMicrosatellites
700 1 $aDEQUIGIOVANNI, G.
700 1 $aLOPES, M. T. G.
700 1 $aAGUIAR, A. V. de
700 1 $aLOPES, R.
700 1 $aVEASEY, E. A.
700 1 $aMACEDO, J. L. V. de
700 1 $aALVES-PEREIRA, A.
700 1 $aFRAXE, T. de J. P.
700 1 $aWREGE, M. S.
700 1 $aGARCIA, J. N.
773 $tFrontiers in Ecology and Evolution, v, 8, article 603448, Jan. 2021.
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Registro original: |
Embrapa Florestas (CNPF) |
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