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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
31/03/1999 |
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Data da última atualização: |
31/03/1999 |
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Autoria: |
KOVNER, J. L.; PATIL, S. A. |
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Afiliação: |
Rocky Mountain Forest and range Experiment Station, Forest Service, U.S. Department of Agriculture, Fort Collins, Colorado, USA. |
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Título: |
Properties of estimators of wildlife population density for the line transect method. |
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Ano de publicação: |
1974 |
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Fonte/Imprenta: |
Biometrics, v.30, p.225-230, June 1974. |
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Idioma: |
Inglês |
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Conteúdo: |
The variance of several estimators of the population density based on the line transect method of distance sampling are estudied under exponential sighting probability. The estimator suggested by Gates [1969] is shown to be minimum variance unbiased estimator. Efficiency of other estimators is obtained with respect to this estimator. |
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Palavras-Chave: |
Line transect method; Vida selvagem; Wildlife population density. |
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Thesagro: |
População. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00851naa a2200181 a 4500
001 1794970
005 1999-03-31
008 1974 bl --- 0-- u #d
100 1 $aKOVNER, J. L.
245 $aProperties of estimators of wildlife population density for the line transect method.
260 $c1974
520 $aThe variance of several estimators of the population density based on the line transect method of distance sampling are estudied under exponential sighting probability. The estimator suggested by Gates [1969] is shown to be minimum variance unbiased estimator. Efficiency of other estimators is obtained with respect to this estimator.
650 $aPopulação
653 $aLine transect method
653 $aVida selvagem
653 $aWildlife population density
700 1 $aPATIL, S. A.
773 $tBiometrics$gv.30, p.225-230, June 1974.
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Registro original: |
Embrapa Pantanal (CPAP) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Pecuária Sudeste. Para informações adicionais entre em contato com cppse.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Pecuária Sudeste. |
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Data corrente: |
17/02/2023 |
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Data da última atualização: |
17/02/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
BRONDI, S. H. G.; MACEDO, A. N. DE; SOUZA, G. B. de; NOGUEIRA, A. R. de A. |
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Afiliação: |
SILVIA H. G. BRONDI; ADRIANA N. DE MACEDO, UFSCAR; GILBERTO BATISTA DE SOUZA, CPPSE; ANA RITA DE ARAUJO NOGUEIRA, CPPSE. |
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Título: |
Application of QuEChERS method and gas chromatography-mass spectrometry for the analysis of cypermethrin residue in milk. |
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Ano de publicação: |
2011 |
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Fonte/Imprenta: |
Journal of Environmental Science and Health, Part B, v. 46, p. 671?677, 2011. |
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DOI: |
10.1080/03601234.2012.592058 |
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Idioma: |
Inglês |
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Conteúdo: |
Analytical methods for the isolation and determination of cypermethrin in milk, based on the solid-phase microextraction (SPME) and QuEChERS methods (Quick, Easy, Cheap, Effective, Rugged, and Safe) are presented. The SPME technique was not appropriate to analyse cypermethrin in milk, even establishing the best extraction conditions, polydimethylsiloxane fiber, 60 min time extraction, 60 ◦C temperature extraction, addition of salt (NaCl) and stirring rate. The extraction efficiency was low probably because of the matrix constituents. The QuEChERS method involves the extraction of the analyte with acetonitrile and simultaneous liquid-liquid partitioning formed by adding anhydrous MgSO4 plus NaCl, followed by the removal of residual water and cleanup using a procedure called dispersive solid-phase extraction, in which anhydrous MgSO4 plus PSA and C18 are mixed with 1 mL of acetonitrile extract. The detection and quantification limits were 0.01 and 0.04 mg kg−1 , respectively, and the percentage recovery obtained ranged from 92 to 105% with relative standard deviations below 7%. |
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Palavras-Chave: |
Quick Easy Cheap Effective Rugged and Safe (QuEChERS). |
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Thesaurus NAL: |
Cypermethrin; Solid phase microextraction. |
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Categoria do assunto: |
W Química e Física |
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Marc: |
LEADER 01848naa a2200205 a 4500
001 2151849
005 2023-02-17
008 2011 bl uuuu u00u1 u #d
024 7 $a10.1080/03601234.2012.592058$2DOI
100 1 $aBRONDI, S. H. G.
245 $aApplication of QuEChERS method and gas chromatography-mass spectrometry for the analysis of cypermethrin residue in milk.$h[electronic resource]
260 $c2011
520 $aAnalytical methods for the isolation and determination of cypermethrin in milk, based on the solid-phase microextraction (SPME) and QuEChERS methods (Quick, Easy, Cheap, Effective, Rugged, and Safe) are presented. The SPME technique was not appropriate to analyse cypermethrin in milk, even establishing the best extraction conditions, polydimethylsiloxane fiber, 60 min time extraction, 60 ◦C temperature extraction, addition of salt (NaCl) and stirring rate. The extraction efficiency was low probably because of the matrix constituents. The QuEChERS method involves the extraction of the analyte with acetonitrile and simultaneous liquid-liquid partitioning formed by adding anhydrous MgSO4 plus NaCl, followed by the removal of residual water and cleanup using a procedure called dispersive solid-phase extraction, in which anhydrous MgSO4 plus PSA and C18 are mixed with 1 mL of acetonitrile extract. The detection and quantification limits were 0.01 and 0.04 mg kg−1 , respectively, and the percentage recovery obtained ranged from 92 to 105% with relative standard deviations below 7%.
650 $aCypermethrin
650 $aSolid phase microextraction
653 $aQuick Easy Cheap Effective Rugged and Safe (QuEChERS)
700 1 $aMACEDO, A. N. DE
700 1 $aSOUZA, G. B. de
700 1 $aNOGUEIRA, A. R. de A.
773 $tJournal of Environmental Science and Health, Part B$gv. 46, p. 671?677, 2011.
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