| |
|
|
|
Registro Completo |
|
Biblioteca(s): |
Embrapa Amazônia Oriental; Embrapa Meio-Norte. |
|
Data corrente: |
10/04/2000 |
|
Data da última atualização: |
01/11/2012 |
|
Autoria: |
RIBEIRO, O.; MACHADO, A. |
|
Título: |
Ocorrencia de um alcaloide do capim gengibre. |
|
Ano de publicação: |
1950 |
|
Fonte/Imprenta: |
Rio de Janeiro: Instituto de Quimica Agricola, 1950. p.7-10. |
|
Série: |
(Instituto de Quimica Agricola. Boletim, 016). |
|
Idioma: |
Português |
|
Notas: |
Encadernado com: RIBEIRO, O.; MACHADO, A. O alcaloide da fruta de lobo. p. 11-13. |
|
Conteúdo: |
Realizaram-se estudos sobre os frutos de Solanum lycocarpum St. Hil. Uma base organica foi isolada em forma cristalina. Pelas constantes da mesma e de seus derivados chegou-se a conclusao ser a lupanina racemica o alcaloide de Solanum lycocarpum St. Hil. Pela primeira vez foi constatada a presenca de lupanina na familia Solanaceae. |
|
Palavras-Chave: |
Capim-gengibre; Fruta-de-lobo; Trichachne vestita. |
|
Thesagro: |
Alcalóide; Capim Gengibre; Composição Química. |
|
Thesaurus Nal: |
alkaloids; chemical composition. |
|
Categoria do assunto: |
-- |
|
Marc: |
LEADER 01089nam a2200241 a 4500
001 1383082
005 2012-11-01
008 1950 bl uuuu u0uu1 u #d
100 1 $aRIBEIRO, O.
245 $aOcorrencia de um alcaloide do capim gengibre.
260 $aRio de Janeiro: Instituto de Quimica Agricola, 1950. p.7-10.$c1950
490 $a(Instituto de Quimica Agricola. Boletim, 016).
500 $aEncadernado com: RIBEIRO, O.; MACHADO, A. O alcaloide da fruta de lobo. p. 11-13.
520 $aRealizaram-se estudos sobre os frutos de Solanum lycocarpum St. Hil. Uma base organica foi isolada em forma cristalina. Pelas constantes da mesma e de seus derivados chegou-se a conclusao ser a lupanina racemica o alcaloide de Solanum lycocarpum St. Hil. Pela primeira vez foi constatada a presenca de lupanina na familia Solanaceae.
650 $aalkaloids
650 $achemical composition
650 $aAlcalóide
650 $aCapim Gengibre
650 $aComposição Química
653 $aCapim-gengibre
653 $aFruta-de-lobo
653 $aTrichachne vestita
700 1 $aMACHADO, A.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Amazônia Oriental (CPATU) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
Registro Completo
|
Biblioteca(s): |
Embrapa Agricultura Digital. |
|
Data corrente: |
21/11/2012 |
|
Data da última atualização: |
14/04/2020 |
|
Tipo da produção científica: |
Artigo em Periódico Indexado |
|
Circulação/Nível: |
A - 1 |
|
Autoria: |
LEPESANT, J. M. J.; COSSEAU, C.; BOISSIER, J.; FREITAG, M.; PORTELA, J.; CLIMENT, D.; PERRIN, C.; ZERLOTINI, A.; GRUNAU, C. |
|
Afiliação: |
JULIE M. J. LEPESANT, Université de Perpignan Via Domitia; CÉLINE COSSEAU, Université de Perpignan Via Domitia; JÉROME BOISSIER, Université de Perpignan Via Domitia; MICHAEL FREITAG, Oregon State University; JULIEN PORTELA, Université de Perpignan Via Domitia; DÉBORAH CLIMENT, Université de Perpignan Via Domitia; CÉCILE PERRIN, Université de Perpignan Via Domitia; ADHEMAR ZERLOTINI NETO, CNPTIA; CHRISTOPH GRUNAU, Université de Perpignan Via Domitia. |
|
Título: |
Chromatin structural changes around satellite repeats on the female sex chromosome in Schistosoma mansoni and their possible role in sex chromosome emergence. |
|
Ano de publicação: |
2012 |
|
Fonte/Imprenta: |
Genome Biology, v. 13, 2012. |
|
Páginas: |
15 p. |
|
DOI: |
10.1186/gb-2012-13-2-r14 |
|
Idioma: |
Inglês |
|
Conteúdo: |
Background: In the leuphotrochozoan parasitic platyhelminth Schistosoma mansoni, male individuals are homogametic (ZZ) whereas females are heterogametic (ZW). To elucidate the mechanisms that led to the emergence of sex chromosomes, we compared the genomic sequence and the chromatin structure of male and female individuals. As for many eukaryotes, the lower estimate for the repeat content is 40%, with an unknown proportion of domesticated repeats. We used massive sequencing to de novo assemble all repeats, and identify unambiguously Z-specific, W-specific and pseudoautosomal regions of the S. mansoni sex chromosomes. Results: We show that 70 to 90% of S. mansoni W and Z are pseudoautosomal. No female-specific gene could be identified. Instead, the W-specific region is composed almost entirely of 36 satellite repeat families, of which 33 were previously unknown. Transcription and chromatin status of female-specific repeats are stage-specific: for those repeats that are transcribed, transcription is restricted to the larval stages lacking sexual dimorphism. In contrast, in the sexually dimorphic adult stage of the life cycle, no transcription occurs. In addition, the euchromatic character of histone modifications around the W-specific repeats decreases during the life cycle. Recombination repression occurs in this region even if homologous sequences are present on both the Z and W chromosomes. Conclusion: Our study provides for the first time evidence for the hypothesis that, at least in organisms with a ZW type of sex chromosomes, repeat-induced chromatin structure changes could indeed be the initial event in sex chromosome emergence. MenosBackground: In the leuphotrochozoan parasitic platyhelminth Schistosoma mansoni, male individuals are homogametic (ZZ) whereas females are heterogametic (ZW). To elucidate the mechanisms that led to the emergence of sex chromosomes, we compared the genomic sequence and the chromatin structure of male and female individuals. As for many eukaryotes, the lower estimate for the repeat content is 40%, with an unknown proportion of domesticated repeats. We used massive sequencing to de novo assemble all repeats, and identify unambiguously Z-specific, W-specific and pseudoautosomal regions of the S. mansoni sex chromosomes. Results: We show that 70 to 90% of S. mansoni W and Z are pseudoautosomal. No female-specific gene could be identified. Instead, the W-specific region is composed almost entirely of 36 satellite repeat families, of which 33 were previously unknown. Transcription and chromatin status of female-specific repeats are stage-specific: for those repeats that are transcribed, transcription is restricted to the larval stages lacking sexual dimorphism. In contrast, in the sexually dimorphic adult stage of the life cycle, no transcription occurs. In addition, the euchromatic character of histone modifications around the W-specific repeats decreases during the life cycle. Recombination repression occurs in this region even if homologous sequences are present on both the Z and W chromosomes. Conclusion: Our study provides for the first time evidence for the hypothesis that, ... Mostrar Tudo |
|
Thesaurus NAL: |
Schistosoma. |
|
Categoria do assunto: |
-- |
|
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/70524/1/gb-2012-13-2-r14.pdf
|
|
Marc: |
LEADER 02420naa a2200253 a 4500
001 1940197
005 2020-04-14
008 2012 bl uuuu u00u1 u #d
024 7 $a10.1186/gb-2012-13-2-r14$2DOI
100 1 $aLEPESANT, J. M. J.
245 $aChromatin structural changes around satellite repeats on the female sex chromosome in Schistosoma mansoni and their possible role in sex chromosome emergence.$h[electronic resource]
260 $c2012
300 $a15 p.
520 $aBackground: In the leuphotrochozoan parasitic platyhelminth Schistosoma mansoni, male individuals are homogametic (ZZ) whereas females are heterogametic (ZW). To elucidate the mechanisms that led to the emergence of sex chromosomes, we compared the genomic sequence and the chromatin structure of male and female individuals. As for many eukaryotes, the lower estimate for the repeat content is 40%, with an unknown proportion of domesticated repeats. We used massive sequencing to de novo assemble all repeats, and identify unambiguously Z-specific, W-specific and pseudoautosomal regions of the S. mansoni sex chromosomes. Results: We show that 70 to 90% of S. mansoni W and Z are pseudoautosomal. No female-specific gene could be identified. Instead, the W-specific region is composed almost entirely of 36 satellite repeat families, of which 33 were previously unknown. Transcription and chromatin status of female-specific repeats are stage-specific: for those repeats that are transcribed, transcription is restricted to the larval stages lacking sexual dimorphism. In contrast, in the sexually dimorphic adult stage of the life cycle, no transcription occurs. In addition, the euchromatic character of histone modifications around the W-specific repeats decreases during the life cycle. Recombination repression occurs in this region even if homologous sequences are present on both the Z and W chromosomes. Conclusion: Our study provides for the first time evidence for the hypothesis that, at least in organisms with a ZW type of sex chromosomes, repeat-induced chromatin structure changes could indeed be the initial event in sex chromosome emergence.
650 $aSchistosoma
700 1 $aCOSSEAU, C.
700 1 $aBOISSIER, J.
700 1 $aFREITAG, M.
700 1 $aPORTELA, J.
700 1 $aCLIMENT, D.
700 1 $aPERRIN, C.
700 1 $aZERLOTINI, A.
700 1 $aGRUNAU, C.
773 $tGenome Biology$gv. 13, 2012.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Agricultura Digital (CNPTIA) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
| Nenhum registro encontrado para a expressão de busca informada. |
|
|
