997 resultados para poliacrilonitrila modificada
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Foi conduzido, em casa de vegetação, um experimento em solução nutritiva de Steimberg modificada, cultivando-se o girassol (Helianthus annuus L.), cv. Anhandy, com cinco nÃveis de cálcio e cinco de boro combinados, em esquema fatorial completo 5 x 5, visando-se induzir sintomas tardios, no inÃcio do florescimento, de deficiência desses elementos. A deficiência isolada de cálcio induziu o sintoma de colapso do capÃtulo quando o nÃvel inicial de cálcio na solução foi tal (15,24 ppm de Ca) que permitiu a manifestação do sintoma no inÃcio do florescimento. A deficiência de boro manifestou-se antes do florescimento, para todos os nÃveis iniciais do micronutriente em solução, e isto impediu sua avaliação, em relação ao capÃtulo.
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The effect of Mg levels in nutrient solution upon root, stem, leaf, fruit and total dry matter production of common bean (Phaseolus vulgaris L. cv. Carioca) was studied. Bean plants were grown in Hoagland & Arnon n. 2 solution modified to obtain 2.4, 24.3, 48.6, 72.9 and 97.2 ppm of Mg. The experimental design was a split-plot factorial replicated three times with five Mg levels and five samplings which were done fortnightly. Results were compared with those observed in plants submitted to a nutrient solution with 48.6 ppm of Mg concentration, considered the ideal Mg content. Only a mild prejudicial effect was observed with Mg excessive levels. Stem, leaves and total dry matter were higher when 2.4 ppm were used, suggesting this level as the concentration chosen for the culture of common bean.
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Incluye BibliografÃa
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The Equatorial Atlantic Margin evolved from three rift systems recorded by a complex set of sedimentary basins developed since Upper Triassic to the Lower Cretaceous (Albian). The first rift system formed Foz do Amazonas Basin in Upper Triassic; the second phase formed Marajó Basin in Berriasian, a new rift in Foz do Amazonas Basin in Valanginian and Bragança-Viseu, Ilha Nova, São LuÃs e Barreirinhas basins in Aptian; the third phase formed Barreirinhas and Pará- Maranhão basins and a new rifting in the Foz do Amazonas Basin between the Aptian and Albian and evolved to continental break up. The main paleostress field during rift evolution was NE-SW and after the continental break up took the E-W direction, from the development of transform zones in the oceanic crust. From Miocene, South America was subjected to intraplate tectonics, which resulted in formation of E-W transcurrent faults that generated transtensive and transpressive segments that formed sedimentary basins and hills, resulting in changes in the drainage network. In Quaternary the landscape was modified by the last ice age that changed the sea level; the coastal drainage network was drowning resulting in the formation of the current line coast.
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Incluye BibliografÃa
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Coordenação de Aperfeiçoamento de Pessoal de NÃvel Superior (CAPES)
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Conselho Nacional de Desenvolvimento CientÃfico e Tecnológico (CNPq)
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Conselho Nacional de Desenvolvimento CientÃfico e Tecnológico (CNPq)
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Pós-graduação em Ciências da Motricidade - IBRC
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Conselho Nacional de Desenvolvimento CientÃfico e Tecnológico (CNPq)
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Coordenação de Aperfeiçoamento de Pessoal de NÃvel Superior (CAPES)
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Pós-graduação em Ciências Biológicas (Biologia Celular e Molecular) - IBRC
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Conselho Nacional de Desenvolvimento CientÃfico e Tecnológico (CNPq)