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 | Acesso ao texto completo restrito à biblioteca da Embrapa Gado de Leite. Para informações adicionais entre em contato com cnpgl.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Leite. |
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Data corrente: |
17/12/2018 |
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Data da última atualização: |
24/01/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
MILHOMENS, G. C.; ALMEIDA, C. G. de; ZANETTE, R. de S. S.; SOUZA, N. L. G. D. de; MUNK, M.; BRANDAO, H. de M.; OLIVEIRA, L. F. C. de. |
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Afiliação: |
Gabriela Costa Milhomens, Universidade Federal de Tocantins; Camila Guimarães de Almeida; Rafaella de Sousa Salomão Zanette, UFJF; Nelson Luis Gonçalves Dias de Souza, Universidade Federal de Tocantins; Michele Munk, UFJF; HUMBERTO DE MELLO BRANDAO, CNPGL; Luiz Fernando Cappa de Oliveira, UFJF. |
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Título: |
Biocompatibility and adsorption properties of hydrogels obtained by graft polymerization of acrylic acid on cellulose from rice hulls. |
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Ano de publicação: |
2018 |
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Fonte/Imprenta: |
Iranian Polymer Journal, v. 27, n. 12, p. 1023-1032, 2018. |
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DOI: |
10.1007/s13726-018-0672-z |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract Hydrogels constitute a group of cross-linked polymeric materials with the capability of swelling and retaining large amounts of water without dissolving. In this work, the hydrogels were obtained by grafting the acrylic acid on cellulose from rice hulls and cross-linking it with glycerol, ethylene glycol, and polyethylene glycol (Mw =200 and 10,000 g mol−1). The samples were characterized using IR and Raman spectroscopy, the absence of the bands at 1636 and 1614 cm−1 (in IR) and at 1659 and 1637 cm−1 (in Raman), in the spectra of grafted cellulose and assigned to ν(C=C), indicated the polymerization process and the absence of the monomer residual. The cross-linking process was verified by the appearance of bands at 1090 cm−1 (IR) and 996 cm−1 (Raman), attributed to ν(C?O?C). Thermogravimetric analysis showed that the cross-linked sample with glycerol presented the lowest thermal stability. The molecular mass of CDClCC-g-AA was 55.56±5.21 kDa with an R2 of 0.9741 and the CDClCC average particle size of 694 nm. The topography and the average roughness of the samples were obtained by atomic force microscopy and the samples that were cross-linked with the polyethylene glycol presented greater roughness. The degree of swelling was lower in the sample cross-linked with ethylene glycol, which was related to its higher degree of cross-linking. Finally, the biocompatibility of the samples was studied by analyzing the toxic effect of the samples on human embryonic kidney cells, where results showed that samples cross-linked with ethylene glycol were non-toxic. MenosAbstract Hydrogels constitute a group of cross-linked polymeric materials with the capability of swelling and retaining large amounts of water without dissolving. In this work, the hydrogels were obtained by grafting the acrylic acid on cellulose from rice hulls and cross-linking it with glycerol, ethylene glycol, and polyethylene glycol (Mw =200 and 10,000 g mol−1). The samples were characterized using IR and Raman spectroscopy, the absence of the bands at 1636 and 1614 cm−1 (in IR) and at 1659 and 1637 cm−1 (in Raman), in the spectra of grafted cellulose and assigned to ν(C=C), indicated the polymerization process and the absence of the monomer residual. The cross-linking process was verified by the appearance of bands at 1090 cm−1 (IR) and 996 cm−1 (Raman), attributed to ν(C?O?C). Thermogravimetric analysis showed that the cross-linked sample with glycerol presented the lowest thermal stability. The molecular mass of CDClCC-g-AA was 55.56±5.21 kDa with an R2 of 0.9741 and the CDClCC average particle size of 694 nm. The topography and the average roughness of the samples were obtained by atomic force microscopy and the samples that were cross-linked with the polyethylene glycol presented greater roughness. The degree of swelling was lower in the sample cross-linked with ethylene glycol, which was related to its higher degree of cross-linking. Finally, the biocompatibility of the samples was studied by analyzing the toxic effect of th... Mostrar Tudo |
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Palavras-Chave: |
Graft polymerization; Hydrogel. |
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Thesaurus Nal: |
Acrylic acid; Biocompatibility; Cellulose; Spectroscopy. |
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Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
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Marc: |
LEADER 02500naa a2200277 a 4500
001 2101832
005 2023-01-24
008 2018 bl uuuu u00u1 u #d
024 7 $a10.1007/s13726-018-0672-z$2DOI
100 1 $aMILHOMENS, G. C.
245 $aBiocompatibility and adsorption properties of hydrogels obtained by graft polymerization of acrylic acid on cellulose from rice hulls.$h[electronic resource]
260 $c2018
520 $aAbstract Hydrogels constitute a group of cross-linked polymeric materials with the capability of swelling and retaining large amounts of water without dissolving. In this work, the hydrogels were obtained by grafting the acrylic acid on cellulose from rice hulls and cross-linking it with glycerol, ethylene glycol, and polyethylene glycol (Mw =200 and 10,000 g mol−1). The samples were characterized using IR and Raman spectroscopy, the absence of the bands at 1636 and 1614 cm−1 (in IR) and at 1659 and 1637 cm−1 (in Raman), in the spectra of grafted cellulose and assigned to ν(C=C), indicated the polymerization process and the absence of the monomer residual. The cross-linking process was verified by the appearance of bands at 1090 cm−1 (IR) and 996 cm−1 (Raman), attributed to ν(C?O?C). Thermogravimetric analysis showed that the cross-linked sample with glycerol presented the lowest thermal stability. The molecular mass of CDClCC-g-AA was 55.56±5.21 kDa with an R2 of 0.9741 and the CDClCC average particle size of 694 nm. The topography and the average roughness of the samples were obtained by atomic force microscopy and the samples that were cross-linked with the polyethylene glycol presented greater roughness. The degree of swelling was lower in the sample cross-linked with ethylene glycol, which was related to its higher degree of cross-linking. Finally, the biocompatibility of the samples was studied by analyzing the toxic effect of the samples on human embryonic kidney cells, where results showed that samples cross-linked with ethylene glycol were non-toxic.
650 $aAcrylic acid
650 $aBiocompatibility
650 $aCellulose
650 $aSpectroscopy
653 $aGraft polymerization
653 $aHydrogel
700 1 $aALMEIDA, C. G. de
700 1 $aZANETTE, R. de S. S.
700 1 $aSOUZA, N. L. G. D. de
700 1 $aMUNK, M.
700 1 $aBRANDAO, H. de M.
700 1 $aOLIVEIRA, L. F. C. de
773 $tIranian Polymer Journal$gv. 27, n. 12, p. 1023-1032, 2018.
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Registro original: |
Embrapa Gado de Leite (CNPGL) |
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Biblioteca(s): |
Embrapa Clima Temperado; Embrapa Uva e Vinho. |
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Data corrente: |
04/06/2018 |
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Data da última atualização: |
06/09/2023 |
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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: |
PAULA, B. V. de; MARQUES, A. C. R.; RODRIGUES, L. A. T.; SOUZA, R. O. S. de; KULMANN, M. S. de S.; KAMINSKI, J.; CERETTA, C. A.; MELO, G. W. B. de; MAYER, N. A.; ANTUNES, L. E.; RICACHENEVSKY, F. K.; NICOLOSO, F. T.; BRUNETTO, G. |
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Afiliação: |
Betania Vahl de Paula; Anderson Cesar Ramos Marques; Lucas Antonio Telles Rodrigues; Rodrigo Otavio Schneider de Souza; Matheus Severo de Souza Kulmann; João Kaminski; Carlos Alberto Ceretta; GEORGE WELLINGTON BASTOS DE MELO, CNPUV; NEWTON ALEX MAYER, CPACT; Luís Eduardo Antunes; Felipe Klein Ricachenevsky; Fernando Teixeira Nicoloso; Gustavo Brunetto. |
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Título: |
Morphological and kinetic parameters of the uptake of nitrogen forms in clonal peach rootstocks. |
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Ano de publicação: |
2018 |
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Fonte/Imprenta: |
Scientia Horticulturae, v. 239, p. 205-209, 2018. |
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DOI: |
https://doi.org/10.1016/j.scienta.2018.05.038 |
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Idioma: |
Inglês
Português |
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Conteúdo: |
Peach (Prunus persica L.) rootstock cultivars are typically selected for scion compatibility, ease of propagation, vigor, development, flowering season, yield, low need for cold temperatures, resistance to diseases, effects on the physical-chemical characteristics of the fruit, plant longevity and adaptation to adverse edaphoclimatic conditions. However, kinetic parameters related to nutrient uptake efficiency are usually not considered, such as those of nitrate (NO3 −) and ammonium (NH4 +). N is the nutrient that most impacts growth and yield. The objective of this study was to show the importance of the kinetic parameters of NO3 − and NH4 + uptake as additional criteria for selecting peach rootstocks. The experiment was conducted in a greenhouse. Three rootstock (?Aldrighi?, ?Tsukuba1? and ?Clone 15′) were grown for 30 days in a pot containing 0.1 mol L-1 CaSO4 solution to reduce internal reserves of N. Afterwards, the plants were placed in Hoagland nutrient solution, where periodic collections of the nutrient solution were carried out for three days and the concentrations of NO3 − and NH4 + were determined. After the third day of collecting the solution, the plants were collected and then separated into leaves, roots and stems. Dry matter and total N content were assessed. The kinetic parameters related to NO3 − and NH4 + uptake (maximum uptake rate - Vmax, affinity constant - Km, Minimum concentration - Cmin, Influx - I) were calculated using Cinética software. The most efficient rootstock for NO3 − and NH4 + uptake was ?Tsukuba1?, as it showed the lowest values of Cmin and Km and the highest values of Vmax and Imax for NO3 − and NH4 +. NO3 − uptake in ?Tsukuba1? and ?Aldrighi? showed a two-phase uptake pattern, suggesting the presence of low and high affinity transport systems. On the other hand, NH4 + uptake in the three cultivars apparently followed a one-phase uptake pattern, suggesting the presence of a high affinity transport system. The kinetic parameters of NO3 − and NH4 + uptake are additional criteria that can be used in selecting peach rootstocks, as they directly influence shoot and root dry matter production and N accumulation in leaves. MenosPeach (Prunus persica L.) rootstock cultivars are typically selected for scion compatibility, ease of propagation, vigor, development, flowering season, yield, low need for cold temperatures, resistance to diseases, effects on the physical-chemical characteristics of the fruit, plant longevity and adaptation to adverse edaphoclimatic conditions. However, kinetic parameters related to nutrient uptake efficiency are usually not considered, such as those of nitrate (NO3 −) and ammonium (NH4 +). N is the nutrient that most impacts growth and yield. The objective of this study was to show the importance of the kinetic parameters of NO3 − and NH4 + uptake as additional criteria for selecting peach rootstocks. The experiment was conducted in a greenhouse. Three rootstock (?Aldrighi?, ?Tsukuba1? and ?Clone 15′) were grown for 30 days in a pot containing 0.1 mol L-1 CaSO4 solution to reduce internal reserves of N. Afterwards, the plants were placed in Hoagland nutrient solution, where periodic collections of the nutrient solution were carried out for three days and the concentrations of NO3 − and NH4 + were determined. After the third day of collecting the solution, the plants were collected and then separated into leaves, roots and stems. Dry matter and total N content were assessed. The kinetic parameters related to NO3 − and NH4 + uptake (maximum uptake rate - Vmax, affinity constant - Km, Minimum concentration - Cmin, Influx - I) were calculated usin... Mostrar Tudo |
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Palavras-Chave: |
Ammonium; Clonal peach rootstocks; Maximum nitrogen influx; Nitrate; Nutrient uptake efficiency; Prunus persica L; Rootstock. |
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Thesaurus NAL: |
Peaches. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/190113/1/Morphological-and-kinetic-parameters-of-the-uptake-of-nitrogen-forms.pdf
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Marc: |
LEADER 03357naa a2200373 a 4500
001 2103453
005 2023-09-06
008 2018 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1016/j.scienta.2018.05.038$2DOI
100 1 $aPAULA, B. V. de
245 $aMorphological and kinetic parameters of the uptake of nitrogen forms in clonal peach rootstocks.$h[electronic resource]
260 $c2018
520 $aPeach (Prunus persica L.) rootstock cultivars are typically selected for scion compatibility, ease of propagation, vigor, development, flowering season, yield, low need for cold temperatures, resistance to diseases, effects on the physical-chemical characteristics of the fruit, plant longevity and adaptation to adverse edaphoclimatic conditions. However, kinetic parameters related to nutrient uptake efficiency are usually not considered, such as those of nitrate (NO3 −) and ammonium (NH4 +). N is the nutrient that most impacts growth and yield. The objective of this study was to show the importance of the kinetic parameters of NO3 − and NH4 + uptake as additional criteria for selecting peach rootstocks. The experiment was conducted in a greenhouse. Three rootstock (?Aldrighi?, ?Tsukuba1? and ?Clone 15′) were grown for 30 days in a pot containing 0.1 mol L-1 CaSO4 solution to reduce internal reserves of N. Afterwards, the plants were placed in Hoagland nutrient solution, where periodic collections of the nutrient solution were carried out for three days and the concentrations of NO3 − and NH4 + were determined. After the third day of collecting the solution, the plants were collected and then separated into leaves, roots and stems. Dry matter and total N content were assessed. The kinetic parameters related to NO3 − and NH4 + uptake (maximum uptake rate - Vmax, affinity constant - Km, Minimum concentration - Cmin, Influx - I) were calculated using Cinética software. The most efficient rootstock for NO3 − and NH4 + uptake was ?Tsukuba1?, as it showed the lowest values of Cmin and Km and the highest values of Vmax and Imax for NO3 − and NH4 +. NO3 − uptake in ?Tsukuba1? and ?Aldrighi? showed a two-phase uptake pattern, suggesting the presence of low and high affinity transport systems. On the other hand, NH4 + uptake in the three cultivars apparently followed a one-phase uptake pattern, suggesting the presence of a high affinity transport system. The kinetic parameters of NO3 − and NH4 + uptake are additional criteria that can be used in selecting peach rootstocks, as they directly influence shoot and root dry matter production and N accumulation in leaves.
650 $aPeaches
653 $aAmmonium
653 $aClonal peach rootstocks
653 $aMaximum nitrogen influx
653 $aNitrate
653 $aNutrient uptake efficiency
653 $aPrunus persica L
653 $aRootstock
700 1 $aMARQUES, A. C. R.
700 1 $aRODRIGUES, L. A. T.
700 1 $aSOUZA, R. O. S. de
700 1 $aKULMANN, M. S. de S.
700 1 $aKAMINSKI, J.
700 1 $aCERETTA, C. A.
700 1 $aMELO, G. W. B. de
700 1 $aMAYER, N. A.
700 1 $aANTUNES, L. E.
700 1 $aRICACHENEVSKY, F. K.
700 1 $aNICOLOSO, F. T.
700 1 $aBRUNETTO, G.
773 $tScientia Horticulturae$gv. 239, p. 205-209, 2018.
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