Co Solutes
Mostrando 1-12 de 32 artigos, teses e dissertações.
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1. NOVO SORVENTE DE HIDROFOBICIDADE REDUZIDA PARA EXTRAÇÃO EM FASE SÓLIDA: PREPARAÇÃO E CARACTERIZAÇÃO
C18 chemically bonded sorbents have been the main materials used in solid phase extraction (SPE). However, due their high hydrophobicity some hydrophobic solutes are strongly retained leading to the consumption of larger quantities of organic solvent for efficient recoveries. This work presents a sorbent with lower hydrophobicity but similar selectivity to t
Quím. Nova. Publicado em: 2015-02
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2. Respostas agronômicas, bioquímicas e fisiológicas de variedades de cana-de-açúcar submetidas a estresse hídrico associado à nematoide de galhas.
The objective of the present study was to evaluate 1) the effect of hydric deficiency on growth of sugarcane varieties and implications of Meloidogyne incognita parasitism on plant response, 2) hydric relations and gaseous change in sugarcane varieties under both nematode parasitism and hydric deficit, 3) concentration of photosynthetic pigments and organic
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/03/2012
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3. Modelagem termodinâmica por extração por solvente de metais divalentes em meio sulfato usando D2EHPA
The extraction of divalent metals (Mn2+, Ni2+, Co2+ and Cu2+) in the system MSO4 - H2SO4 - H2O - D2EHPA in isoparaffin (17/21) was studied by a thermodynamic model based on chemical equilibria with mass and charge balance equations. The activity coefficients of all solutes in the aqueous phase were calculated by Davies equation. By applying this model, the e
Química Nova. Publicado em: 2012
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4. Caracterização fisioanatômica e bioquímica do Juazeiro (Ziziphus joazeiro Mart.) submetido ao déficit hídrico.
Dentre as espécies nativas da Caatinga que possuem valor econômico e ecológico, o Ziziphus joazeiro Mart. se destaca por servir de alimento para caprinosna seca e sombreamento para o rebanho bovino, além de ser fonte medicinal para a população circunvizinha. No entanto, recentemente, o Z. joazeiro foi incluído na lista de espécies de alta prioridade
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/02/2011
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5. AlteraÃÃes fisiolÃgicas induzidas por estresses abiÃticos em plantas jovens de pinhÃo-manso / PHYSIOLOGICAL CHANGES INDUCED BY ABIOTIC STRESSES IN PHYSIC NUT YOUNG PLANTS
In this work were studied diverse physiological mechanisms, as the osmotic adjustment, photosynthesis, including gas exchange and chlorophyll fluorescence parameters, as well the oxidative responses in physic nuts submitted to different abiotic stresses as: salinity, drought and high temperature. The first experiment aimed to study the effects of increase of
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/10/2009
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6. Crescimento, trocas gasosas, partiÃÃo de Ãons e metabolismo do nitrogÃnio em plantas de milho submetidas à salinidade e diferentes fontes de N / Growth, gas exchange, partition of ions and nitrogen metabolism in maize plants subjected to salinity and different nitrogen sources
O objetivo deste trabalho foi estudar o efeito da fonte de N no crescimento, nas trocas gasosas, na partiÃÃo de Ãons e no metabolismo do N em plantas de milho (Zea mays L.) submetidas à salinidade. Para isto, sementes de milho foram semeadas em copos plÃsticos contendo vermiculita, sendo mantidas em casa de vegetaÃÃo. Em seguida, as plÃntulas foram t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/02/2009
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7. Effects of co-solutes addition in rheology of the acidified lacteous gels / Efeito da adição de co-solutos na reologia de geis lacteos acidificados
Foram estudadas as interações entre as proteínas do leite e a carragena em sistemas acidificados com glucona-delta-lactona (GDL) contendo ou não co-solutos, como açúcar (sacarose) e a mistura salina KCl/NaCl, na formação/obtenção de géis. Foi possível avaliar o efeito das variáveis de composição (concentrações de caseinato de sódio, concent
Publicado em: 2008
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8. Preparação, caracterização morfologica e aplicações de hidrogeis de P(N-isopropilacrilamida-co-acido acrilico) / Preparation, morphological characterization of P(NIPAAM-CO-AAc) hydrogels
Hydrogels composed of polymeric networks are of great interest as biomaterials. In this work hydrogels of poly(N-isopropilacrilamide) copolimerized with acrylic acid (P(NIPAAm-co-AAc)) and cross-linked with metilene-bisacrilamide (MBAAm) at different cross-linking degrees, interpenetrated (IPNs) and semi-IPNs with PVA. The presence of AAc allowed increasing
Publicado em: 2008
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9. Interfacial phenomena at the compressed co2-water interface
Compressed CO2 is considered to be a viable alternative to toxic volatile organic solvents with potential applications in areas including separation reactions, and materials formation processes. Thus an interest in CO2 stems from the fact that it is very inexpensive, has low toxicity, and is not a regulated. However, compressed CO2 has a zero dipole moment a
Brazilian Journal of Chemical Engineering. Publicado em: 2006-06
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10. Supercritical carbon dioxide extraction of pigments from Bixa orellana seeds (experiments and modeling)
Supercritical CO2 extraction of the pigments from Bixa orellana seeds was carried out in a flow apparatus at a pressure of 200 bar and a temperature of 40 ºC at two fluid flow rates (0.67g/min and 1.12g/min). The efficiency of the extraction was low (only about 1% of the pigment was extracted). The increase in flow rate led to a decrease in pigment recovery
Brazilian Journal of Chemical Engineering. Publicado em: 2006-06
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11. Estudo das interações entre biopolimeros e polpas de frutas tropicais em cisalhamento estacionario e oscilatorio
The rheological behavior of guar and xanthan gums in passion tfuit pulp was evaluated by means of shear flow and oscillatory shear tests. Herschel-Bulckley model represented successfully biopolymers flow behavior and Cross model was used to describe those behaviors in a broad shear stress range. In pulp tfuit systems, xanthan gum showed more pseudoplasticity
Publicado em: 2002
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12. Effects of molecular crowding on the interaction between DNA and the Escherichia coli regulatory protein TyrR.
Fluorescence quenching has been used to measure quantitatively the effects of sucrose and triethylene glycol on the interaction between the Escherichia coli regulatory protein TyrR and a 30-basepair oligonucleotide containing the strong TyrR box of the TyrR operon. It was observed that the apparent binding constant increased in the presence of co-solutes, th