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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Leite. |
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Data corrente: |
17/02/2017 |
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Data da última atualização: |
30/01/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
SOUZA, F. De F. C. De; NASCIMENTO, F. R. Do; OTENIO, M. H. |
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Afiliação: |
Flaviane de Fátima Cândida de Souza, UFF; Flávio Rodrigues do Nascimento, UFF; MARCELO HENRIQUE OTENIO, CNPGL. |
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Título: |
Contexto geoambiental da bacia do Rio do Peixe, Sudeste do Brasil. |
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Ano de publicação: |
2015 |
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Fonte/Imprenta: |
Geoamazônia, v. 3, n. 6, p. 121-132, 2015. |
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Idioma: |
Português |
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Conteúdo: |
Resumo O presente trabalho trata de divulgar os resultados referentes à compartimentação geoambiental da bacia hidrográfica do rio do Peixe, Estado de Minas Gerais, mediante abordagem geossistêmica. O objetivo foi identificar e caracterizar diferentes sistemas ambientais (unidades de paisagens) através de imagens de satélite (SRTM e LANDSAT-8), bases cartográficas e trabalhos de campo para análise ambiental sobre os atributos naturais em conectividade às tipologias de uso/cobertura do solo. Esta bacia agrupa paisagens de significativo interesse em termos de expressão biótica e abiótica, configurando áreas prioritárias e estratégias para conservação da biodiversidade e geodiversidade. Contudo, as atividades humanas, caracterizada pela ocupação e uso da terra para diversos fins, vem delineando cenários de perda de ecossistemas, especialmente naqueles de acesso dificultado pelos altos declives como é o caso dos compartimentos serranos. |
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Palavras-Chave: |
Compartimentação geoambiental; Paisagens. |
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Thesagro: |
Bacia Hidrográfica. |
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Categoria do assunto: |
Z Localizações Geográficas |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/156013/1/Cnpgl-2016-RevGeoAmazonia-Contexto.pdf
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Marc: |
LEADER 01509naa a2200181 a 4500
001 2064622
005 2023-01-30
008 2015 bl uuuu u00u1 u #d
100 1 $aSOUZA, F. De F. C. De
245 $aContexto geoambiental da bacia do Rio do Peixe, Sudeste do Brasil.$h[electronic resource]
260 $c2015
520 $aResumo O presente trabalho trata de divulgar os resultados referentes à compartimentação geoambiental da bacia hidrográfica do rio do Peixe, Estado de Minas Gerais, mediante abordagem geossistêmica. O objetivo foi identificar e caracterizar diferentes sistemas ambientais (unidades de paisagens) através de imagens de satélite (SRTM e LANDSAT-8), bases cartográficas e trabalhos de campo para análise ambiental sobre os atributos naturais em conectividade às tipologias de uso/cobertura do solo. Esta bacia agrupa paisagens de significativo interesse em termos de expressão biótica e abiótica, configurando áreas prioritárias e estratégias para conservação da biodiversidade e geodiversidade. Contudo, as atividades humanas, caracterizada pela ocupação e uso da terra para diversos fins, vem delineando cenários de perda de ecossistemas, especialmente naqueles de acesso dificultado pelos altos declives como é o caso dos compartimentos serranos.
650 $aBacia Hidrográfica
653 $aCompartimentação geoambiental
653 $aPaisagens
700 1 $aNASCIMENTO, F. R. Do
700 1 $aOTENIO, M. H.
773 $tGeoamazônia$gv. 3, n. 6, p. 121-132, 2015.
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Registro original: |
Embrapa Gado de Leite (CNPGL) |
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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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