Encontrados 70 documentos, a visualizar página 1 de 7
Efeitos agronómicos resultantes da utilização de diferentes técnicas de aplicaç...
Carneiro, J.P.; Soares, D.; Monteiro, J.; Surgy, S.; Pereira, J.; Coutinho, J.; Trindade, H.; Fangueiro, D.A aplicação de chorume ao solo por injeção, ou após tratamento através da separação mecânica de sólidos ou da acidificação, são práticas consideradas como suscetíveis de reduzirem emissões de amoníaco (NH3). Com o objetivo de avaliar, em condições mediterrânicas, o efeito destas técnicas de aplicação de chorume na produção de silagem de milho e na eficiência da utilização pelas plantas do azoto (N) aplicado, fo...
Effect of pig slurry acidification and form soil application in N apparent leac...
Sousa, J.R.; Carneiro, J.P.; Fangeiro, D.; Coutinho, J.Effect of pig slurry acidification and form soil application in N apparent leaching under field conditions.
Nitrogen use efficiency in a soil amended with different organic residues
Carneiro, J.P.; Coutinho, J.; Trindade, H.Nitrogen efficient use is important for economic and environmental sustainability of cropping systems. Three examples of fertilization practices considered to be able to contribute to the improvement of N use efficiency are: the use of a waste with higher C/N ratio, such as pulp mill sludge (Kirchmann and Bergström, 2003), specific application time and/or split application of nitrogen fertilizers (Roberts, 2008...
Ehanced oil recovery under simulated reservoir conditions using an indigenous B...
Gudiña, Eduardo J.; Pereira, Jorge F. B.; Costa, A. R.; Rodrigues, L. R.; Coutinho, J. A. P.; Teixeira, J. A.Microbial Enhanced Oil Recovery (MEOR) is potentially useful to increment oil recovery from reservoirs beyond primary and secondary recovery operations using microorganisms and their metabolites. In situ stimulation of microorganisms that produce biosurfactants and degrade heavy oil fractions reduces the capillary forces that retain the oil inside the reservoir and decreases oil viscosity, thus promoting its fl...
Production and characterization of biosurfactants produced by microorganisms is...
Pereira, Jorge F. B.; Costa, A. R.; Gudiña, Eduardo J.; Rodrigues, L. R.; Teixeira, J. A.; Coutinho, J. A. P.Surfactants are amphiphilic molecules that comprise both hydrophilic and hydrophobic moieties, allowing the reduction the surface and interfacial tensions, as well as the formation of oil in water or water in oil emulsions. These surface-active compounds are extensively used by petroleum industries in order to reduce the capillary forces that entrapped the oil inside the reservoir. The compounds synthetized che...
Physico-chemical property prediction and environmental fate modelling of N-acyl...
Schröder, B.; Martins, M.A.R.; Pinho, Simão; Coutinho, J.A.P.(Subcooled) vapour pressures, aqueous solubilities, Henry constants, log KOW and log KOC partition constants have been estimated for a set of N-acyl-chalcogenourea derivatives using several prediction methods (COSMO-RS in its COSMOtherm implementation, SPARC as well as EPA’s EPIsuite). The data are discussed in terms of substituent effects: how do subtle changes in the chemical composition influence basic physi...
Solubility of hesperetin in mixed solvents
Ferreira, Olga; Schroeder, B.; Coutinho, J.A.P.; Pinho, SimãoThe study of the solubility of tlavonoids is essential to support the design of several separation processes in the food and pharmaceutical industries. Hesperetin is a flavanone with great importance for its promising biological and pharmacological properties.
The cation effect on the aqueous solubility of amino acids in the presence of s...
Tomé, L.I.N.; Pinho, Simão; Jorge, M.; Gomes, J.R.B.; Coutinho, J.A.P.Aiming at contributing to the understanding the molecular level mechanisms governing the behavior of biocompounds in aqueous saline environments, experimental solubility measurements and molecular dynamics (MD) simulations were performed for aqueous solutions of three amino acids (alanine, valine and isoleucine) in the presence of a series of inorganic salts.
O cultivo do arroz e a resposta do agrossistema às alterações ambientais de tem...
Figueiredo, N.; Merino, R.; Prazeres, A.; Fareleira, P.; Vargues, A.; Carranca, C.; Marques, P.; Pereira, J.; Goufo, P.; Trindade, H.; Carneiro, J.P.A cultivar de arroz Ariete apresentou uma eficiência máxima de uso do N de 64% e uma produção de 8,5 t ha-1, após aplicação de 120 kg N ha-1, metade em fundo e metade ao afilhamento. Os fatores de emissão de GEEs medidos no campo foram de 136 kg CH4 ha-1 e 1,5% para o N2O. As emissões de COVs (especialmente na forma de terpenos) e NH3 foram reduzidas, mas atingiram 8 kg N-NH3 ha-1 dia-1 após a adubação de cober...
N2O emissions from soil amended with cattle slurry under mediterranean conditions
Carneiro, J.P.; Coutinho, J.; Trindade, H.N2O emissions are affected by several factors, including type of fertilizer, edafo-climatic conditions and mitigation measures applied. A field experiment was carried out in central Portugal for two consecutive years, to evaluate the effect over soil N2O emissions originated from the application of cattle slurry (CS) to a double-cropping system producing maize and oats. The use of a nitrification inhibitor (DCD...
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