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Registro Completo |
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Biblioteca(s): |
Embrapa Amazônia Oriental; Embrapa Arroz e Feijão; Embrapa Semiárido. |
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Data corrente: |
23/08/1996 |
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Data da última atualização: |
21/01/2004 |
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Autoria: |
GRUIJTER, J. J. de. |
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Título: |
Numerical classification of soils and its application in survey. |
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Ano de publicação: |
1977 |
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Fonte/Imprenta: |
Wageningen: Centre for Agricultural Publishing and Documentation, 1977. |
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Páginas: |
117 p. |
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Série: |
(PUDOC. Agricultural Research Reports, 855). |
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ISBN: |
90-220-0608-5 |
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Idioma: |
Inglês |
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Notas: |
Appendix 1 (maps 1-6), appendix 2 (maps 7-12), appendix 3, appendix 4, appendix 5. |
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Conteúdo: |
Numerical classification of soils was studied with emphasis on methodology and feasibility in survey. A procedure was designed for construction of classes sufficiently homogeneous in terms of relevant properties and handlable by the surveyor. In the procedure 'central' depth-profiles are calculeted separately for each property (e.g. clay content), from a sample of depth-profiles, with a relocation method minimizing within-class variances. Any soil profile can thus be identified in the field by allocating its constituent depth-profiles to the central depth-profile the is most similar for the respective properties. Resulting strings of class labels serve for interim data recording. If too many combinations of central depth-profiles arise to map all individually, they are fused into larger classes and within-class variances are again minimized. This procedure was applied to survey data from a marine clay area in the Netherlands: field estimates for 6 properties in 2212 profiels divided into 20 depth intervals. A new method was used to map classes automatically. Tests showed that: samples of several hundred profiles were needed; other of profiles and initial solution for relocation had little effect on results; only extreme weighting significantly affected homogeneity for different variables. Choise of weights and number of classes should be related and supported by sensitivity analysis. |
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Palavras-Chave: |
Classificacao; Methods. |
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Thesagro: |
Classificação do Solo; Levantamento; Mapa; Método; Solo. |
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Thesaurus Nal: |
Soil; soil classification. |
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Categoria do assunto: |
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P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 02207nam a2200265 a 4500
001 1211655
005 2004-01-21
008 1977 bl uuuu 00u1 u #d
020 $a90-220-0608-5
100 1 $aGRUIJTER, J. J. de
245 $aNumerical classification of soils and its application in survey.
260 $aWageningen: Centre for Agricultural Publishing and Documentation$c1977
300 $a117 p.
490 $a(PUDOC. Agricultural Research Reports, 855).
500 $aAppendix 1 (maps 1-6), appendix 2 (maps 7-12), appendix 3, appendix 4, appendix 5.
520 $aNumerical classification of soils was studied with emphasis on methodology and feasibility in survey. A procedure was designed for construction of classes sufficiently homogeneous in terms of relevant properties and handlable by the surveyor. In the procedure 'central' depth-profiles are calculeted separately for each property (e.g. clay content), from a sample of depth-profiles, with a relocation method minimizing within-class variances. Any soil profile can thus be identified in the field by allocating its constituent depth-profiles to the central depth-profile the is most similar for the respective properties. Resulting strings of class labels serve for interim data recording. If too many combinations of central depth-profiles arise to map all individually, they are fused into larger classes and within-class variances are again minimized. This procedure was applied to survey data from a marine clay area in the Netherlands: field estimates for 6 properties in 2212 profiels divided into 20 depth intervals. A new method was used to map classes automatically. Tests showed that: samples of several hundred profiles were needed; other of profiles and initial solution for relocation had little effect on results; only extreme weighting significantly affected homogeneity for different variables. Choise of weights and number of classes should be related and supported by sensitivity analysis.
650 $aSoil
650 $asoil classification
650 $aClassificação do Solo
650 $aLevantamento
650 $aMapa
650 $aMétodo
650 $aSolo
653 $aClassificacao
653 $aMethods
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Registro original: |
Embrapa Arroz e Feijão (CNPAF) |
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Biblioteca |
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Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
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URL |
Voltar
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Solos. Para informações adicionais entre em contato com cnps.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Solos. |
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Data corrente: |
14/03/2000 |
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Data da última atualização: |
25/08/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
Internacional - A |
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Autoria: |
OLIVEIRA, V. M. de; COUTINHO, H. L. da C.; SOBRAL, B. W. S.; GUIMARAES, C. T.; ELSAS, J. D. van; MANFIO, G. P. |
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Afiliação: |
V. M. DE OLIVEIRA, FUNDAÇÃO ANDRÉ TOSELLO; HEITOR LUIZ DA COSTA COUTINHO, CNPS; B. W. S. SOBRAL, NATIONAL CENTER FOR GENOME RESOURCES; C. T. GUIMARÃES, NATIONAL CENTER FOR GENOME RESOURCES; J. D. VAN ELSAS, RESEARCH INSTITUTE FOR PLANT PROTECTION; GILSON PAULO MANFIO, FUNDAÇÃO ANDRÉ TOSELLO. |
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Título: |
Discrimination of Rhizobium tropici and R. leguminosarum strains by PCR-specific amplification of 16S-23S rDNA spacer region fragments and denaturing gradient gel electrophoresis (DGGE). |
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Ano de publicação: |
1999 |
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Fonte/Imprenta: |
Letters in Applied Microbiology, v. 28, N. 2, p. 137-141, Feb. 1999. |
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DOI: |
https://doi.org/10.1046/j.1365-2672.1999.00480.x |
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Idioma: |
Inglês |
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Conteúdo: |
With the aim of detecting Rhizobium species directly in the environment, specific PCR primers for Rh, tropici and Rh, leguminosarum were designed on the basis of sequence analysis of 16S-23S rDNA spacer regions of several Rh. tropici, Rh. leguminosarum and Agrobacterium rhizogenes strains. Primer specificity was checked by comparison with available rDNA spacer sequences in databases, and by PCR using DNA from target and reference strains. Sequence polymorphisms of rDNA spacer fragments among strains of the same species were detected by denaturing gradient gel electrophoresis (DGGE). The specific PCR primers designed in the study could be applied to evaluate the diversity of Rh. tropici and Rh. leguminosarum by analysing the polymorphisms of 16S-23S spacer rDNA amplified from either whole-cell or soil-extracted DNA. |
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Palavras-Chave: |
Analysis; Database; Diversidade; Diversity; tropici. |
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Thesagro: |
Base de Dados; DNA; Eletroforese; Rhizobium; Solo. |
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Thesaurus NAL: |
electrophoresis; soil. |
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Categoria do assunto: |
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P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 01876naa a2200337 a 4500
001 1335364
005 2023-08-25
008 1999 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1046/j.1365-2672.1999.00480.x$2DOI
100 1 $aOLIVEIRA, V. M. de
245 $aDiscrimination of Rhizobium tropici and R. leguminosarum strains by PCR-specific amplification of 16S-23S rDNA spacer region fragments and denaturing gradient gel electrophoresis (DGGE).$h[electronic resource]
260 $c1999
520 $aWith the aim of detecting Rhizobium species directly in the environment, specific PCR primers for Rh, tropici and Rh, leguminosarum were designed on the basis of sequence analysis of 16S-23S rDNA spacer regions of several Rh. tropici, Rh. leguminosarum and Agrobacterium rhizogenes strains. Primer specificity was checked by comparison with available rDNA spacer sequences in databases, and by PCR using DNA from target and reference strains. Sequence polymorphisms of rDNA spacer fragments among strains of the same species were detected by denaturing gradient gel electrophoresis (DGGE). The specific PCR primers designed in the study could be applied to evaluate the diversity of Rh. tropici and Rh. leguminosarum by analysing the polymorphisms of 16S-23S spacer rDNA amplified from either whole-cell or soil-extracted DNA.
650 $aelectrophoresis
650 $asoil
650 $aBase de Dados
650 $aDNA
650 $aEletroforese
650 $aRhizobium
650 $aSolo
653 $aAnalysis
653 $aDatabase
653 $aDiversidade
653 $aDiversity
653 $atropici
700 1 $aCOUTINHO, H. L. da C.
700 1 $aSOBRAL, B. W. S.
700 1 $aGUIMARAES, C. T.
700 1 $aELSAS, J. D. van
700 1 $aMANFIO, G. P.
773 $tLetters in Applied Microbiology$gv. 28, N. 2, p. 137-141, Feb. 1999.
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Embrapa Solos (CNPS) |
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