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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
09/06/1995 |
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Data da última atualização: |
09/06/1995 |
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Autoria: |
BRITTO, D. P. P. de S.; ARONOVICH, S.; RIBEIRO, H. |
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Título: |
Comparacao entre 2 variedades de capim elefante, (Pennisetum purpureum Schum) e de 6 diferentes espacos de tempo entre os cortes das plantas. |
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Ano de publicação: |
1965 |
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Fonte/Imprenta: |
In: CONGRESSO INTERNACIONAL DE PASTAGENS, 9., 1965, Sao Paulo. Anais. Sao Paulo: Secretaria da Agricultura, 1965. v.2, p.1683-1685. |
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Idioma: |
Português |
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Conteúdo: |
Foram comparadas duas variedades de capim elefante Pennisetum purpureum Schum., cortadas cada 4, 6, 8, 10, 12 e 14 semanas. A variedade conhecida na Secao Experimental de Agrostologia como variedade "B" mostrou-se mais produtiva, exceto quando cortada cada 14 semanas. Essa diferenca foi maior quando os cortes foram mais frequentes. Os cortes menos frequentes apresentaram maior producao de forragem, porem com menor teor de proteinas e maior conteudo de fibras. Tambem a proporcao haste-folhas foi bem melhor (mais folhas) quando os cortes foram menos espacados. A producao de proteinas por hectare foi maior quando as plantas foram cortadas cada 4 semanas. |
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Palavras-Chave: |
Elephant grass; Management; Pasture; Strain. |
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Thesagro: |
Capim Elefante; Manejo; Pastagem; Pennisetum Purpureum; Variedade. |
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Categoria do assunto: |
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Marc: |
LEADER 01470naa a2200253 a 4500
001 1784474
005 1995-06-09
008 1965 bl --- 0-- u #d
100 1 $aBRITTO, D. P. P. de S.
245 $aComparacao entre 2 variedades de capim elefante, (Pennisetum purpureum Schum) e de 6 diferentes espacos de tempo entre os cortes das plantas.
260 $c1965
520 $aForam comparadas duas variedades de capim elefante Pennisetum purpureum Schum., cortadas cada 4, 6, 8, 10, 12 e 14 semanas. A variedade conhecida na Secao Experimental de Agrostologia como variedade "B" mostrou-se mais produtiva, exceto quando cortada cada 14 semanas. Essa diferenca foi maior quando os cortes foram mais frequentes. Os cortes menos frequentes apresentaram maior producao de forragem, porem com menor teor de proteinas e maior conteudo de fibras. Tambem a proporcao haste-folhas foi bem melhor (mais folhas) quando os cortes foram menos espacados. A producao de proteinas por hectare foi maior quando as plantas foram cortadas cada 4 semanas.
650 $aCapim Elefante
650 $aManejo
650 $aPastagem
650 $aPennisetum Purpureum
650 $aVariedade
653 $aElephant grass
653 $aManagement
653 $aPasture
653 $aStrain
700 1 $aARONOVICH, S.
700 1 $aRIBEIRO, H.
773 $tIn: CONGRESSO INTERNACIONAL DE PASTAGENS, 9., 1965, Sao Paulo. Anais. Sao Paulo: Secretaria da Agricultura, 1965.$gv.2, p.1683-1685.
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Registro original: |
Embrapa Pantanal (CPAP) |
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Registro Completo
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Biblioteca(s): |
Embrapa Meio Ambiente. |
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Data corrente: |
05/04/2017 |
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Data da última atualização: |
29/06/2017 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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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. |
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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. |
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Título: |
Green mecanochemical process for carbon nanotubes coating with humic acid: application and ecotoxicity evaluation. |
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Ano de publicação: |
2016 |
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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. |
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Idioma: |
Inglês |
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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 |
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Palavras-Chave: |
Ecotoxicologia; Nantubes. |
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Categoria do assunto: |
W Química e Física |
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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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Embrapa Meio Ambiente (CNPMA) |
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