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Registro Completo |
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Biblioteca(s): |
Embrapa Amazônia Oriental; Embrapa Territorial. |
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Data corrente: |
13/10/2000 |
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Data da última atualização: |
30/08/2009 |
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Autoria: |
CARVALHO, J. C. de M. |
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Título: |
Consideracoes sobre o uso da terra na Amazonia brasileira. |
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Ano de publicação: |
1979 |
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Fonte/Imprenta: |
Rio de Janeiro: Fundacao Brasileira para a Conservacao da Natureza, 1979. |
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Páginas: |
79p. |
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Série: |
(Fundacao Brasileira para a Conservacao da Natureza. Divulgacao, 010). |
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Idioma: |
Português |
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Conteúdo: |
A ocupacao da Amazonia e a conservacao do ambiente. O ecossistema Amazonico. A acao do homem no ecossistema. Pontos criticos resultantes da acao humana. Diretrizes ecologicas para uma acao racional na ocupacao humana da Amazonia. Parques nacionais, Reservas equivalentes e parques indigenas. Pesquisa cientifica e tecnologica. Florestas tropicais. Legislacao. Codigo florestal. Lei de protecao a fauna. Decreto-lei de protecao e estimulo a Pesca. O tratado de cooperacao Amazonica e o conservacionismo. Educacao conservacionista. |
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Palavras-Chave: |
Brasil; Conservation. |
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Thesagro: |
Conservação; Meio Ambiente; Recurso Natural; Uso da Terra. |
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Thesaurus Nal: |
Amazonia; environment; land use; natural resources. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01263nam a2200253 a 4500
001 1388943
005 2009-08-30
008 1979 bl uuuu 00u1 u #d
100 1 $aCARVALHO, J. C. de M.
245 $aConsideracoes sobre o uso da terra na Amazonia brasileira.
260 $aRio de Janeiro: Fundacao Brasileira para a Conservacao da Natureza$c1979
300 $a79p.
490 $a(Fundacao Brasileira para a Conservacao da Natureza. Divulgacao, 010).
520 $aA ocupacao da Amazonia e a conservacao do ambiente. O ecossistema Amazonico. A acao do homem no ecossistema. Pontos criticos resultantes da acao humana. Diretrizes ecologicas para uma acao racional na ocupacao humana da Amazonia. Parques nacionais, Reservas equivalentes e parques indigenas. Pesquisa cientifica e tecnologica. Florestas tropicais. Legislacao. Codigo florestal. Lei de protecao a fauna. Decreto-lei de protecao e estimulo a Pesca. O tratado de cooperacao Amazonica e o conservacionismo. Educacao conservacionista.
650 $aAmazonia
650 $aenvironment
650 $aland use
650 $anatural resources
650 $aConservação
650 $aMeio Ambiente
650 $aRecurso Natural
650 $aUso da Terra
653 $aBrasil
653 $aConservation
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Registro original: |
Embrapa Amazônia Oriental (CPATU) |
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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: |
11/07/2014 |
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Data da última atualização: |
29/03/2023 |
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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: |
AMARAL, C. D. B.; NOBREGA, J. A.; NOGUEIRA, A. R. de A. |
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Afiliação: |
CLARICE D. B. AMARAL, UFSCar/ APPLIES INSTRUMENTAL ANALYSIS/SÃO CARLOS, SP; JOAQUIM A. NÓBREGA, UFSCar/ APPLIES INSTRUMENTAL ANALYSIS/SÃO CARLOS, SP; ANA RITA DE ARAUJO NOGUEIRA, CPPSE. |
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Título: |
Investigation of arsenic species stability by HPLC-ICP-MS in plants stored under different conditions for 12 months. |
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Ano de publicação: |
2014 |
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Fonte/Imprenta: |
Microchemical Journal, v. 117, p. 122-126, nov. 2014. |
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DOI: |
https://doi.org/10.1016/j.microc.2014.06.018 |
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Idioma: |
Inglês |
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Conteúdo: |
In studies of speciation, the conservation of species in their original forms is a very challenging issue, and the reliability of the results deeply depends on it. Preliminary steps of sample preparation and storage temperature may influence the conservation of species and extraction efficiency. Plant sample (Brachiaria brizantha Stapf. cv. Marandu) grown in As-containing soil was harvested and divided into four portions. The first portion was frozen-dried, milled with liquid N2 and stored at room temperature; the second portion was lyophilized and stored at 4 °C; and the remaining portions were kept at two storage temperatures (− 18 and − 80 °C) without any prior procedure. Aliquots of samples stored under different conditions were extracted every 2 months for a 12-month period. The total content of As was 2.30 ± 0.27 mg kg− 1 of dried and ground sample and As species were determined by HPLC-ICP-MS. The extraction was more efficient in sample aliquots that were lyophilized and ground (87–90%) than those only stored under different temperatures (53–66%). Furthermore, only for lyophilized and ground samples dimethylarsenic acid (DMA) was extracted. Concerning the storage time under the two tested temperatures, no significant differences on species were found and they remained stable. Standard deviations for replicates of samples that were not frozen-dried and ground were higher, and this behavior can be explained by sample heterogeneity. For the As species here studied it can be concluded that lyophilization and cryogenic grinding strategies were the most suitable sample pretreatments for As speciation in plant tissue. MenosIn studies of speciation, the conservation of species in their original forms is a very challenging issue, and the reliability of the results deeply depends on it. Preliminary steps of sample preparation and storage temperature may influence the conservation of species and extraction efficiency. Plant sample (Brachiaria brizantha Stapf. cv. Marandu) grown in As-containing soil was harvested and divided into four portions. The first portion was frozen-dried, milled with liquid N2 and stored at room temperature; the second portion was lyophilized and stored at 4 °C; and the remaining portions were kept at two storage temperatures (− 18 and − 80 °C) without any prior procedure. Aliquots of samples stored under different conditions were extracted every 2 months for a 12-month period. The total content of As was 2.30 ± 0.27 mg kg− 1 of dried and ground sample and As species were determined by HPLC-ICP-MS. The extraction was more efficient in sample aliquots that were lyophilized and ground (87–90%) than those only stored under different temperatures (53–66%). Furthermore, only for lyophilized and ground samples dimethylarsenic acid (DMA) was extracted. Concerning the storage time under the two tested temperatures, no significant differences on species were found and they remained stable. Standard deviations for replicates of samples that were not frozen-dried and ground were higher, and this behavior can be explained by sample heterogeneity. For the As species here studied it can... Mostrar Tudo |
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Palavras-Chave: |
HPLC ICP MS; Sample processing. |
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Thesaurus NAL: |
arsenic; storage. |
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Categoria do assunto: |
W Química e Física |
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Marc: |
LEADER 02331naa a2200205 a 4500
001 1990421
005 2023-03-29
008 2014 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1016/j.microc.2014.06.018$2DOI
100 1 $aAMARAL, C. D. B.
245 $aInvestigation of arsenic species stability by HPLC-ICP-MS in plants stored under different conditions for 12 months.$h[electronic resource]
260 $c2014
520 $aIn studies of speciation, the conservation of species in their original forms is a very challenging issue, and the reliability of the results deeply depends on it. Preliminary steps of sample preparation and storage temperature may influence the conservation of species and extraction efficiency. Plant sample (Brachiaria brizantha Stapf. cv. Marandu) grown in As-containing soil was harvested and divided into four portions. The first portion was frozen-dried, milled with liquid N2 and stored at room temperature; the second portion was lyophilized and stored at 4 °C; and the remaining portions were kept at two storage temperatures (− 18 and − 80 °C) without any prior procedure. Aliquots of samples stored under different conditions were extracted every 2 months for a 12-month period. The total content of As was 2.30 ± 0.27 mg kg− 1 of dried and ground sample and As species were determined by HPLC-ICP-MS. The extraction was more efficient in sample aliquots that were lyophilized and ground (87–90%) than those only stored under different temperatures (53–66%). Furthermore, only for lyophilized and ground samples dimethylarsenic acid (DMA) was extracted. Concerning the storage time under the two tested temperatures, no significant differences on species were found and they remained stable. Standard deviations for replicates of samples that were not frozen-dried and ground were higher, and this behavior can be explained by sample heterogeneity. For the As species here studied it can be concluded that lyophilization and cryogenic grinding strategies were the most suitable sample pretreatments for As speciation in plant tissue.
650 $aarsenic
650 $astorage
653 $aHPLC ICP MS
653 $aSample processing
700 1 $aNOBREGA, J. A.
700 1 $aNOGUEIRA, A. R. de A.
773 $tMicrochemical Journal$gv. 117, p. 122-126, nov. 2014.
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Embrapa Pecuária Sudeste (CPPSE) |
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