Phosphorus Compounds
Mostrando 25-36 de 115 artigos, teses e dissertações.
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25. Distribuição do fósforo no perfil do solo sob sistema plantio direto
The Cerrado, even with soils of low fertility, has been increasing in importance within the Brazilian agricultural scenario, by planning the use and management of land, with the adoption of no-tillage system (NT) and the use of correctives and fertilizers. The application of fertilizers in NT is all doneon the soil surface, which leads to the accumulation of
Publicado em: 2009
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26. Espectroscopia Mössbauer na caracterização de compostos ferrosos em solos e sua relação com retenção de fósforo
The chemical role of iron-bearing compounds on the dynamics of phosphorus in selected Brazilian latosols was investigated. The iron oxides were characterized in an attempt to assess their main chemical-mineralogical properties influencing the ion sorption mechanisms in those pedosystems. It was found that increasing total iron contents tend to increase the p
Química Nova. Publicado em: 2008
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27. Avaliação e critérios de eficiência nos processos de tratamento de fluido de corte por eletroflotação / Evaluation criteri and efficiency in the procedures for treatment of fluid cutting by eletroflotation
In the machining process cutting fluids are used to facilitate the manufacture of metal parts, which has resulted in problems of various orders, ranging from the generation of harmful effects on the desktop to the aggression of the environment with their improper disposal. The cutting fluids are composed of oils and minerals, synthetic solutions and water, c
Publicado em: 2008
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28. Compostos organofosforados pentavalentes: histórico, métodos sintéticos de preparação e aplicações como inseticidas e agentes antitumorais
This paper is a review of the history, synthesis and application of organophosphorus compounds, especially of those of pentavalent phosphorus, such as phosphoramidates, phosphorothioates, phosphonates and phosphonic acids with insecticide and anticancer activities. The organophosphorus compounds with agrochemical applications show great structural variety, T
Química Nova. Publicado em: 2007-02
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29. Desempenho de reatores anaeróbios de leito fixo no tratamento de águas residuárias da lavagem e descascamento/despolpa dos frutos do cafeeiro / Performance of the anaerobic fixed-bed reactors in the treatment of wastewater from the washing and pulping/husking the cherries of the coffee shrub
Three anaerobic fixed-bed reactors with upflow and containing immobilized biomass were operationally evaluated for the treatment of wastewater from the coffee cherries processing (WCP). Because the performance of those reactors are related to the supportive medium providing adherence and growth to the biofilm, the following materials were studied: blast furn
Publicado em: 2007
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30. Impact of use and management on the organic matter fractions of latosols from the Rio das Mortes Basin. / Impacto de uso e manejo em fraÃÃes da matÃria orgÃnica de latossolos da Bacia do Rio das Mortes - MG
Rio das Mortes basin is an important area of coffee and potato production in Minas Gerais state (Brazil). In these crops, it is frequent the application of lime and phosphorus, as well as the use of practices of intensive revolving of soil, especially in potato croplands. Although these management practices are important for agricultural process, they affect
Publicado em: 2007
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31. Síntese e estudo das interações de 3-(fosfato)- e 3-(fosfonamida)-4,4,4-trifluor-but-1-il-carbamatos de etila com a enzima acetilcolinesterase e síntese de 3-carboxietil- e 3-pirimidin-2-il-2-oxo-6-trifluormetil-[1,2,3]oxatiazinanas / Synthesis and interactions studies of 3-phosphate- and 3-phosphonamide-4,4,4-trifluoro-but-1-yl-carbamic acid ethyl esters with acetylcholinesterase enzyme and synthesis of 3-carboxyethyl- and 3-pyrimidin-2-yl-2-oxo-6-trifluoromethyl-[1,2,3]oxathiazinanes
A series of [3-(phosphate)-4,4,4-trifluoro-but-1-yl]-carbamic acid ethyl ester and [3-(phosphonamide)-4,4,4-trifluoro-but-1-yl]-carbamic acid ethyl ester obtained from the reaction of g-amino alcohols (4,4,4-trifluoro-3-hydroxy-butan-1-yl)-carbamic acid ethyl ester with phosphorus oxychloride in the presence of base and subsequent reaction with alcohols or a
Publicado em: 2007
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32. Composition of the cell wall from the ectomycorrhizal fungus Pisolithus microcarpus and Pisolithus tinctorius / Composição da parede celular dos fungos ectomicorrízicos Pisolithus microcarpus e Pisolithus tinctorius
This work aimed at assessing the chemical composition of the cell wall of isolates PT301 of Pisolithus tinctorius and H4111 of Pisolithus microcarpus, and see the effects of fungicides dimethomorph and pyroquilon in concentrations of 1, 5, 10, 15 and 30 ppm and chitosan in concentrations of 1, 2, 5 and 10 mg mL-1 on the micelial morphology. The wall of Pisol
Publicado em: 2007
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33. Análise de crescimento e produtividade de duas variedades de cana-de-açúcar (Saccharum spp) influenciadas por doses de fósforo
The knowledge of the leaf area is required every time the sugarcane is subjected to evaluation in which different varieties are compared or submitted to different environmental conditions, managements or fertilizations, therefore evidently showing alteration in dimensions of the plant leaves, so affecting the photosynthetic process. Although the higher breat
Publicado em: 2007
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34. Aspectos limnológicos e sanitários de uma lagoa costeira no litoral leste do Ceará - lagoa do Batoque / Limnological and sanitary aspects of a coastal lagoon in the eastern coast of Ceará lagoa do Batoque
The water quality of Batoque lagoon, a coastal lagoon located along the eastern shoreline of the state of Ceará, Brazil, was characterized by means of monthly samplings from May to November 2005 to obtain dry-season (May-Jun) and wet-season (Aug-Nov) data. Additionally, two nycthemeral (24hr.) samplings were performed in July and December to observe daily v
Publicado em: 2006
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35. Evaluation of filtration ditches as method of post treatment of effluent anaerobic : removal natural of pathogens and nutrients in application of high hydrauli rates / Avaliação das valas de filtração como metodo de pos-tratamento de efluente anaerobico : remoção natural de patogenos e nutrientes na aplicação de altas taxas hidraulicas
The aim of this work was to study filtration ditches as a method of low cost applicable the isolated homes and the small Brazilian municipalities for the posttreatment of anaerobic effluent from a system septic tank with anaerobic unit in the removal of natural nutrients and pathogenic microorganisms. For the research were analyzed three filtration ditches o
Publicado em: 2006
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36. DETERMINATION OF THE INORGANICS COMPOUNDS OF NITROGENOUS (AMMONIA, NITRITE AND NITRATE) AND TOTAL PHOSPHORUS, IN THE WATER OF RESERVOIR GAVIÃO, AND ITS CONTRIBUTION FOR THE EUTROPHICATION. / Determinação dos Compostos Inorgânicos Nitrogenados (Amônia, Nitrito e Nitrato) e Fósforo Total, na Água do Açude Gavião, e sua Contribuição para a Eutrofização
O açude Gavião está localizado no Estado do Ceará,município de Pacatuba (Lat:-3,904323S; Long:-38,528984W), possui capacidade de armazenamento de 53hm3 , com área da bacia hidráulica e hidrográfica de 7 e 97Km2, respectivamente. Apesar desse açude Gavião ser considerado um açude modelo, e constituir-se no último reservatório do sistema da abaste
Publicado em: 2006