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Registro Completo |
Biblioteca(s): |
Embrapa Hortaliças. |
Data corrente: |
17/11/2015 |
Data da última atualização: |
17/11/2015 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
CORREIA, N. M.; VILLELA, G. B. |
Afiliação: |
NUBIA MARIA CORREIA, CNPH; G. B. VILLELA., Monsanto Brasil, Petronina. |
Título: |
Trinexapac-ethyl and sulfometuron-methyl selectivity to youn eucalyptus plants. |
Ano de publicação: |
2015 |
Fonte/Imprenta: |
Planta Daninha, Viçosa, MG, v. 33, n. 2, p. 259-266, Apr./June 2015. |
ISSN: |
1806-9681 |
DOI: |
10.1590/0100-83582015000200011 |
Idioma: |
Inglês |
Notas: |
On line. |
Conteúdo: |
The objective of this study was to assess the selectivity of the plant growth regulators trinexapac-ethyl and sulfometuronmethyl, used as sugarcane ripeners, to eucalyptus (Eucalyptus urograndis) young plants. |
Palavras-Chave: |
Eucalyptus urograndis; Regulador vegetal. |
Thesagro: |
Eucalipto; Fitotoxicidade. |
Thesaurus Nal: |
Eucalyptus; Phytotoxicity. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/133106/1/0100-8358-pd-33-02-00259-Nubia.pdf
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Marc: |
LEADER 00925naa a2200241 a 4500 001 2028675 005 2015-11-17 008 2015 bl uuuu u00u1 u #d 022 $a1806-9681 024 7 $a10.1590/0100-83582015000200011$2DOI 100 1 $aCORREIA, N. M. 245 $aTrinexapac-ethyl and sulfometuron-methyl selectivity to youn eucalyptus plants.$h[electronic resource] 260 $c2015 500 $aOn line. 520 $aThe objective of this study was to assess the selectivity of the plant growth regulators trinexapac-ethyl and sulfometuronmethyl, used as sugarcane ripeners, to eucalyptus (Eucalyptus urograndis) young plants. 650 $aEucalyptus 650 $aPhytotoxicity 650 $aEucalipto 650 $aFitotoxicidade 653 $aEucalyptus urograndis 653 $aRegulador vegetal 700 1 $aVILLELA, G. B. 773 $tPlanta Daninha, Viçosa, MG$gv. 33, n. 2, p. 259-266, Apr./June 2015.
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Registro original: |
Embrapa Hortaliças (CNPH) |
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Registro Completo
Biblioteca(s): |
Embrapa Meio Ambiente. |
Data corrente: |
05/04/2017 |
Data da última atualização: |
29/06/2017 |
Tipo da produção científica: |
Resumo em Anais de Congresso |
Autoria: |
COA, F.; CLEMENTE, Z.; LOPES, J. R.; RODRIGUES NETO, L. L.; ALVES, O. L.; CASTRO, V. L. S. S. de; BARBIERI, E.; MARTINEZ, D. S. T. |
Afiliação: |
F. COA, CNPEM; Z. CLEMENTE, Bolsista; J. R. LOPES, CNPEM; L. L. RODRIGUES NETO, Unicamp; O. L. ALVES, Unicamp; VERA LUCIA SCHERHOLZ S DE CASTRO, CNPMA; E. BARBIERI, Instituto de Pesca; D. S. T. MARTINEZ, CNPEM. |
Título: |
Green mecanochemical process for carbon nanotubes coating with humic acid: application and ecotoxicity evaluation. |
Ano de publicação: |
2016 |
Fonte/Imprenta: |
In: ENCONTRO ANUAL DA SOCIEDADE BRASILEIRA DE PESQUISA EM MATERIAIS, 15., 2016, Campinas. [Abstracts...] Rio de Janeiro: Sociedade Brasileira de Pesquisas em Materiais, 2016. Resumo B6SZ. |
Idioma: |
Inglês |
Conteúdo: |
Nanomaterials (NM) are promising for environmental remediation due to their unreleased properties such as high surface area and reactivity. Chemical oxidations (H2SO4/HNO3) have been applied to carbon NM in order to favor their application, but these are expensive and hazardous. In this work, industrial grade multiwalled carbon nanotubes (raw-MWCNT) were coated with humic acid (HA) by a ball milling processing (solid state). The aim was to apply a green mechanochemical process to improve the colloidal stability of MWCNTs and their removal capacity of metals. The HA-MWCNT complex was studied by atomic force microscope (AFM), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), dynamic light scattering (DLS), electrophoretic light scattering (ELS) and ultraviolet-visible spectroscopy (UV-Vis). Cu2+ sorption from water by HA-MWCNT, MWCNT-COOH and milledMWCNT were compared. Acute bioassays (96h) were performed with Daphnia magna exposed to 0.0; 0.1; 1.0; 5.0 and 10.0 mg/L of HA-MWCNT. Our results showed that the coating process enhanced the zeta potential of raw-MWCNT of -25.4±0.2 mV to -37.4±0.7 mV and reduced their hydrodynamic diameter of 393.2±27.3 nm to 212.5±5.6 nm in ultrapure water. AFM images of HA-MWCNT showed that it has an irregular surface, due to the humic acid coating. The complex was 4 times (84±1.8%) more efficient to remove Cu2+ than MWCNTCOOH (20.0±1.4%) and 11 times compared to milled-MWCNT (7.6±3.1%). The increases in Oxygen and the reductions in Carbon on surface of HA-MWCNT relative to raw-MWCNT and milled-MWCNT indicated the introduction of functional oxygenated groups on MWCNT. The HA-MWCNT did not show acute toxicity against D. magna. These results suggest that the coating changes the MWCNT surface, resulting in a material with potential to metal remediation, prepared without oxidizing acids and that did not show toxicity on D. magna. MenosNanomaterials (NM) are promising for environmental remediation due to their unreleased properties such as high surface area and reactivity. Chemical oxidations (H2SO4/HNO3) have been applied to carbon NM in order to favor their application, but these are expensive and hazardous. In this work, industrial grade multiwalled carbon nanotubes (raw-MWCNT) were coated with humic acid (HA) by a ball milling processing (solid state). The aim was to apply a green mechanochemical process to improve the colloidal stability of MWCNTs and their removal capacity of metals. The HA-MWCNT complex was studied by atomic force microscope (AFM), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), dynamic light scattering (DLS), electrophoretic light scattering (ELS) and ultraviolet-visible spectroscopy (UV-Vis). Cu2+ sorption from water by HA-MWCNT, MWCNT-COOH and milledMWCNT were compared. Acute bioassays (96h) were performed with Daphnia magna exposed to 0.0; 0.1; 1.0; 5.0 and 10.0 mg/L of HA-MWCNT. Our results showed that the coating process enhanced the zeta potential of raw-MWCNT of -25.4±0.2 mV to -37.4±0.7 mV and reduced their hydrodynamic diameter of 393.2±27.3 nm to 212.5±5.6 nm in ultrapure water. AFM images of HA-MWCNT showed that it has an irregular surface, due to the humic acid coating. The complex was 4 times (84±1.8%) more efficient to remove Cu2+ than MWCNTCOOH (20.0±1.4%) and 11 times compared to milled-MWCNT (7.6±3.1%). ... Mostrar Tudo |
Palavras-Chave: |
Ecotoxicologia; Nantubes. |
Categoria do assunto: |
W Química e Física |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/161193/1/2016RA-040.pdf
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Marc: |
LEADER 02763nam a2200217 a 4500 001 2068138 005 2017-06-29 008 2016 bl uuuu u00u1 u #d 100 1 $aCOA, F. 245 $aGreen mecanochemical process for carbon nanotubes coating with humic acid$bapplication and ecotoxicity evaluation.$h[electronic resource] 260 $aIn: ENCONTRO ANUAL DA SOCIEDADE BRASILEIRA DE PESQUISA EM MATERIAIS, 15., 2016, Campinas. [Abstracts...] Rio de Janeiro: Sociedade Brasileira de Pesquisas em Materiais, 2016. Resumo B6SZ.$c2016 520 $aNanomaterials (NM) are promising for environmental remediation due to their unreleased properties such as high surface area and reactivity. Chemical oxidations (H2SO4/HNO3) have been applied to carbon NM in order to favor their application, but these are expensive and hazardous. In this work, industrial grade multiwalled carbon nanotubes (raw-MWCNT) were coated with humic acid (HA) by a ball milling processing (solid state). The aim was to apply a green mechanochemical process to improve the colloidal stability of MWCNTs and their removal capacity of metals. The HA-MWCNT complex was studied by atomic force microscope (AFM), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), dynamic light scattering (DLS), electrophoretic light scattering (ELS) and ultraviolet-visible spectroscopy (UV-Vis). Cu2+ sorption from water by HA-MWCNT, MWCNT-COOH and milledMWCNT were compared. Acute bioassays (96h) were performed with Daphnia magna exposed to 0.0; 0.1; 1.0; 5.0 and 10.0 mg/L of HA-MWCNT. Our results showed that the coating process enhanced the zeta potential of raw-MWCNT of -25.4±0.2 mV to -37.4±0.7 mV and reduced their hydrodynamic diameter of 393.2±27.3 nm to 212.5±5.6 nm in ultrapure water. AFM images of HA-MWCNT showed that it has an irregular surface, due to the humic acid coating. The complex was 4 times (84±1.8%) more efficient to remove Cu2+ than MWCNTCOOH (20.0±1.4%) and 11 times compared to milled-MWCNT (7.6±3.1%). The increases in Oxygen and the reductions in Carbon on surface of HA-MWCNT relative to raw-MWCNT and milled-MWCNT indicated the introduction of functional oxygenated groups on MWCNT. The HA-MWCNT did not show acute toxicity against D. magna. These results suggest that the coating changes the MWCNT surface, resulting in a material with potential to metal remediation, prepared without oxidizing acids and that did not show toxicity on D. magna. 653 $aEcotoxicologia 653 $aNantubes 700 1 $aCLEMENTE, Z. 700 1 $aLOPES, J. R. 700 1 $aRODRIGUES NETO, L. L. 700 1 $aALVES, O. L. 700 1 $aCASTRO, V. L. S. S. de 700 1 $aBARBIERI, E. 700 1 $aMARTINEZ, D. S. T.
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