| |
|
|
|
Registro Completo |
|
Biblioteca(s): |
Embrapa Meio Norte / UEP-Parnaíba. |
|
Data corrente: |
03/06/1993 |
|
Data da última atualização: |
03/06/1993 |
|
Autoria: |
CHILDS, E. C. |
|
Título: |
The water equipotentials and streamlines in drained land: V. the moving water table. |
|
Ano de publicação: |
0 |
|
Fonte/Imprenta: |
s.n.t. |
|
Idioma: |
Inglês |
|
Conteúdo: |
The method of electric analogues as applied to drainage problems is extended to deal with the case of a rising or falling water table, that is, to the unsteady state following changes of rate of rainfall, with a system of equidistantly spaced drains. It is shown that, over a very considerable range of movement following cessation of rain, starting rom a steady state and continuing until the water table is but little is but little higher than the drain level, the water table falls as a whole without appreciable change of shape, after which it naturally falls more slowly over the drain line than elsewhere, since the distance left to fall is samller. The relation between water-table height and time is shown for various horizontal distances from the drain.The water table approaches drain level asymptotically but not, except fortuitously, exponentially, since the heigt-time curve has a different shape for cach distance from the drain line. Over the range where the water table falls without change of shape, it also rises without change of shape when rainfall is resumed. Consequently, the average water table during the period of fluctuation coincides with the water table for steady rainfall of some average instensity, always provided that the movement is not carried outside this range. When the initial state is that of saturation to the soil surface istead of a steady state corresponding to constant rainfall, cessation of rainfall is followed at first by a faster fall of water table over the drainline than... MenosThe method of electric analogues as applied to drainage problems is extended to deal with the case of a rising or falling water table, that is, to the unsteady state following changes of rate of rainfall, with a system of equidistantly spaced drains. It is shown that, over a very considerable range of movement following cessation of rain, starting rom a steady state and continuing until the water table is but little is but little higher than the drain level, the water table falls as a whole without appreciable change of shape, after which it naturally falls more slowly over the drain line than elsewhere, since the distance left to fall is samller. The relation between water-table height and time is shown for various horizontal distances from the drain.The water table approaches drain level asymptotically but not, except fortuitously, exponentially, since the heigt-time curve has a different shape for cach distance from the drain line. Over the range where the water table falls without change of shape, it also rises without change of shape when rainfall is resumed. Consequently, the average water table during the period of fluctuation coincides with the water table for steady rainfall of some average instensity, always provided that the movement is not carried outside this range. When the initial state is that of saturation to the soil surface istead of a steady state corresponding to constant rainfall, cessation of rainfall is followed at first by a faster fall of wate... Mostrar Tudo |
|
Palavras-Chave: |
Ground water; Movement. |
|
Thesagro: |
Água; Drenagem; Lençol Freático; Movimento; Solo. |
|
Thesaurus Nal: |
drainage; soil; water. |
|
Categoria do assunto: |
-- |
|
Marc: |
LEADER 02094naa a2200241 a 4500
001 1073364
005 1993-06-03
008 bl --- 0-- u #d
100 1 $aCHILDS, E. C.
245 $aThe water equipotentials and streamlines in drained land$bV. the moving water table.
260 $c0
520 $aThe method of electric analogues as applied to drainage problems is extended to deal with the case of a rising or falling water table, that is, to the unsteady state following changes of rate of rainfall, with a system of equidistantly spaced drains. It is shown that, over a very considerable range of movement following cessation of rain, starting rom a steady state and continuing until the water table is but little is but little higher than the drain level, the water table falls as a whole without appreciable change of shape, after which it naturally falls more slowly over the drain line than elsewhere, since the distance left to fall is samller. The relation between water-table height and time is shown for various horizontal distances from the drain.The water table approaches drain level asymptotically but not, except fortuitously, exponentially, since the heigt-time curve has a different shape for cach distance from the drain line. Over the range where the water table falls without change of shape, it also rises without change of shape when rainfall is resumed. Consequently, the average water table during the period of fluctuation coincides with the water table for steady rainfall of some average instensity, always provided that the movement is not carried outside this range. When the initial state is that of saturation to the soil surface istead of a steady state corresponding to constant rainfall, cessation of rainfall is followed at first by a faster fall of water table over the drainline than...
650 $adrainage
650 $asoil
650 $awater
650 $aÁgua
650 $aDrenagem
650 $aLençol Freático
650 $aMovimento
650 $aSolo
653 $aGround water
653 $aMovement
773 $ts.n.t.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
 | Acesso ao texto completo restrito à biblioteca da Embrapa Solos. Para informações adicionais entre em contato com cnps.biblioteca@embrapa.br. |
Registro Completo
|
Biblioteca(s): |
Embrapa Solos. |
|
Data corrente: |
14/03/2000 |
|
Data da última atualização: |
25/08/2023 |
|
Tipo da produção científica: |
Artigo em Periódico Indexado |
|
Circulação/Nível: |
Internacional - A |
|
Autoria: |
OLIVEIRA, V. M. de; COUTINHO, H. L. da C.; SOBRAL, B. W. S.; GUIMARAES, C. T.; ELSAS, J. D. van; MANFIO, G. P. |
|
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. |
|
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). |
|
Ano de publicação: |
1999 |
|
Fonte/Imprenta: |
Letters in Applied Microbiology, v. 28, N. 2, p. 137-141, Feb. 1999. |
|
DOI: |
https://doi.org/10.1046/j.1365-2672.1999.00480.x |
|
Idioma: |
Inglês |
|
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. |
|
Palavras-Chave: |
Analysis; Database; Diversidade; Diversity; tropici. |
|
Thesagro: |
Base de Dados; DNA; Eletroforese; Rhizobium; Solo. |
|
Thesaurus NAL: |
electrophoresis; soil. |
|
Categoria do assunto: |
--
P Recursos Naturais, Ciências Ambientais e da Terra |
|
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.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Solos (CNPS) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
| Nenhum registro encontrado para a expressão de busca informada. |
|
|
