| |
|
|
|
Registro Completo |
|
Biblioteca(s): |
Embrapa Arroz e Feijão; Embrapa Mandioca e Fruticultura; Embrapa Meio-Norte; Embrapa Semiárido; Embrapa Unidades Centrais. |
|
Data corrente: |
15/12/1993 |
|
Data da última atualização: |
13/09/2013 |
|
Autoria: |
PASSOS, O. S. |
|
Afiliação: |
ORLANDO SAMPAIO PASSOS, CNPMF. |
|
Título: |
Sistemas de ensino, pesquisa e extensão agrícolas no Estado da Califórnia. |
|
Ano de publicação: |
1980 |
|
Fonte/Imprenta: |
Cruz das Almas: EMBRAPA-CNPMF, 1980. |
|
Páginas: |
4p. |
|
Série: |
(EMBRAPA-CNPMF. Miscelânea, 3). |
|
Idioma: |
Português |
|
Conteúdo: |
O desenvolvimento da agricultura nos Estados Unidos apresenta índices dos mais vertiginosos. A eficiência do processo agrícola nesse país pode ser avaliada na relação número de produtos de alimentos e fibras e habitantes. Em 1820, um produtor fornecia alimentos e fibras para 4 pessoas. Um século após essa data, essa relação atingia o dobro e para 1980, a previsão é de 1:65. Significa que houve uma modificação substancial nos sistemas de produção, partindo-se de uma agricultura elementar para um modelo de agro-indústria. |
|
Palavras-Chave: |
Estados Unidos; Extensão; Extensão agrícola; Sistema; Sistema de ensino. |
|
Thesagro: |
Agricultura; Ensino; Extensão Rural; Pesquisa. |
|
Thesaurus Nal: |
California. |
|
Categoria do assunto: |
--
X Pesquisa, Tecnologia e Engenharia |
|
Marc: |
LEADER 01213nam a2200253 a 4500
001 1638089
005 2013-09-13
008 1980 bl uuuu u0uu1 u #d
100 1 $aPASSOS, O. S.
245 $aSistemas de ensino, pesquisa e extensão agrícolas no Estado da Califórnia.
260 $aCruz das Almas: EMBRAPA-CNPMF$c1980
300 $a4p.
490 $a(EMBRAPA-CNPMF. Miscelânea, 3).
520 $aO desenvolvimento da agricultura nos Estados Unidos apresenta índices dos mais vertiginosos. A eficiência do processo agrícola nesse país pode ser avaliada na relação número de produtos de alimentos e fibras e habitantes. Em 1820, um produtor fornecia alimentos e fibras para 4 pessoas. Um século após essa data, essa relação atingia o dobro e para 1980, a previsão é de 1:65. Significa que houve uma modificação substancial nos sistemas de produção, partindo-se de uma agricultura elementar para um modelo de agro-indústria.
650 $aCalifornia
650 $aAgricultura
650 $aEnsino
650 $aExtensão Rural
650 $aPesquisa
653 $aEstados Unidos
653 $aExtensão
653 $aExtensão agrícola
653 $aSistema
653 $aSistema de ensino
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Mandioca e Fruticultura (CNPMF) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
 | Acesso ao texto completo restrito à biblioteca da Embrapa Instrumentação. Para informações adicionais entre em contato com cnpdia.biblioteca@embrapa.br. |
Registro Completo
|
Biblioteca(s): |
Embrapa Instrumentação. |
|
Data corrente: |
21/12/2023 |
|
Data da última atualização: |
15/05/2024 |
|
Tipo da produção científica: |
Artigo em Periódico Indexado |
|
Circulação/Nível: |
A - 3 |
|
Autoria: |
DORM, B. C.; PARIS JUNIOR, J. A.; SILVA, L. H. D. da; FORATO, L. A.; NOSSA, T. S.; CARVALHO, A. J. F.; RESENDE, F. A.; GANDINI, A.; TROVATTI, E. |
|
Afiliação: |
LUCIMARA APARECIDA FORATO, CNPDIA. |
|
Título: |
Synthesis of a cysteine Diels–Alder‑based polymer by simultaneous double‑click chemistry and its cyto‑genotoxicity evaluation. |
|
Ano de publicação: |
2023 |
|
Fonte/Imprenta: |
Macromolecular Research, v. 32, n. 2, 2023. |
|
Páginas: |
133-144 |
|
ISSN: |
2092-7673 |
|
DOI: |
https://doi.org/10.1007/s13233-023-00216-8 |
|
Idioma: |
Inglês |
|
Conteúdo: |
Abstract The click chemistry reactions and its use in living organisms have been widely developed; however, few studies describe the safety of the reagents and products. Furan–maleimide represent one important pair of reagents for the click Diels–Alder reaction, and were chosen here to perform the minimalist click reaction with cysteine to reveal their preliminary safety features by cytotoxicity tests. The functional groups of amino acids allow them to be chemically modifed, mainly for the synthesis of monomers and polymers. Here, cysteine was used in the click reaction, since it displays an SH group in its side chain, useful to perform thiol–ene reactions. Its amine group easily reacts with anhydrides, allowing it to couple with the furan derivative “furan–maleic anhydride adduct”. The mixture of the cysteine with the adduct in solution gives rise to the double simultaneous thiol–ene/amine maleimide click reactions. The thiol group and the furan double bond provide the reactive functional groups for the polymerization. The synthesis of the polymer based on cysteine–Diels–Alder adduct confrmed the condensation nature of the reaction. Preliminary safety and biocompatibility tests of this new polymer and its starting reagents were carried out, since these parameters represent one of the most important features for operating and scaling up the production. This one-step double-click reaction is interesting for application in several felds, since it has the advantage of using natural and renewable raw materials, in addition to its handling safety. MenosAbstract The click chemistry reactions and its use in living organisms have been widely developed; however, few studies describe the safety of the reagents and products. Furan–maleimide represent one important pair of reagents for the click Diels–Alder reaction, and were chosen here to perform the minimalist click reaction with cysteine to reveal their preliminary safety features by cytotoxicity tests. The functional groups of amino acids allow them to be chemically modifed, mainly for the synthesis of monomers and polymers. Here, cysteine was used in the click reaction, since it displays an SH group in its side chain, useful to perform thiol–ene reactions. Its amine group easily reacts with anhydrides, allowing it to couple with the furan derivative “furan–maleic anhydride adduct”. The mixture of the cysteine with the adduct in solution gives rise to the double simultaneous thiol–ene/amine maleimide click reactions. The thiol group and the furan double bond provide the reactive functional groups for the polymerization. The synthesis of the polymer based on cysteine–Diels–Alder adduct confrmed the condensation nature of the reaction. Preliminary safety and biocompatibility tests of this new polymer and its starting reagents were carried out, since these parameters represent one of the most important features for operating and scaling up the production. This one-step double-click reaction is interesting for application in several felds, since it has the advantage of using nat... Mostrar Tudo |
|
Palavras-Chave: |
Diels–Alder; Renewable resource; Thiol-ene. |
|
Categoria do assunto: |
-- |
|
Marc: |
LEADER 02466naa a2200289 a 4500
001 2160195
005 2024-05-15
008 2023 bl uuuu u00u1 u #d
022 $a2092-7673
024 7 $ahttps://doi.org/10.1007/s13233-023-00216-8$2DOI
100 1 $aDORM, B. C.
245 $aSynthesis of a cysteine Diels–Alder‑based polymer by simultaneous double‑click chemistry and its cyto‑genotoxicity evaluation.$h[electronic resource]
260 $c2023
300 $a133-144
520 $aAbstract The click chemistry reactions and its use in living organisms have been widely developed; however, few studies describe the safety of the reagents and products. Furan–maleimide represent one important pair of reagents for the click Diels–Alder reaction, and were chosen here to perform the minimalist click reaction with cysteine to reveal their preliminary safety features by cytotoxicity tests. The functional groups of amino acids allow them to be chemically modifed, mainly for the synthesis of monomers and polymers. Here, cysteine was used in the click reaction, since it displays an SH group in its side chain, useful to perform thiol–ene reactions. Its amine group easily reacts with anhydrides, allowing it to couple with the furan derivative “furan–maleic anhydride adduct”. The mixture of the cysteine with the adduct in solution gives rise to the double simultaneous thiol–ene/amine maleimide click reactions. The thiol group and the furan double bond provide the reactive functional groups for the polymerization. The synthesis of the polymer based on cysteine–Diels–Alder adduct confrmed the condensation nature of the reaction. Preliminary safety and biocompatibility tests of this new polymer and its starting reagents were carried out, since these parameters represent one of the most important features for operating and scaling up the production. This one-step double-click reaction is interesting for application in several felds, since it has the advantage of using natural and renewable raw materials, in addition to its handling safety.
653 $aDiels–Alder
653 $aRenewable resource
653 $aThiol-ene
700 1 $aPARIS JUNIOR, J. A.
700 1 $aSILVA, L. H. D. da
700 1 $aFORATO, L. A.
700 1 $aNOSSA, T. S.
700 1 $aCARVALHO, A. J. F.
700 1 $aRESENDE, F. A.
700 1 $aGANDINI, A.
700 1 $aTROVATTI, E.
773 $tMacromolecular Research$gv. 32, n. 2, 2023.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Instrumentação (CNPDIA) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
| Expressão de busca inválida. Verifique!!! |
|
|
