Encontrados 14 documentos, a visualizar página 1 de 2
Optimization and characterization of biosurfactant production by Bacillus subti...
Pereira, J. F.; Gudiña, Eduardo J.; Costa, Rita; Vitorino, Rui; Teixeira, J. A.; Coutinho, João A. P.; Rodrigues, L. R.Biosurfactant production by three Bacillus subtilis strains (#309, #311 and #573) isolated from Brazilian crude oils was optimized based on different carbon and nitrogen sources. The lowest surface tension values were obtained using sucrose containing media for the three isolates. Biosurfactants produced by each strain were characterized by Fourier transform infrared spectroscopy (FTIR), proton nuclear magnetic...
Deficit irrigation in Mediterranean environment. What lessons have we learnt fr...
Chaves, M.M.; Zarrouk, O.; Francisco, R.; Costa, J.M.; Santos, T.; Regalado, A.P.; Rodrigues, M.L.; Lopes, C.Libro de Actas - X Simposium Hispano Português de Relaciones Hidricas, 2010 ; Deficit irrigation techniques, implying that water is supplied at levels below full crop evapotranspiration throughout the growing season or in specific phenological stages, such as regulated deficit irrigation (RDI) or partial root drying (PRD), emerged as potential strategies to increase water savings with marginal decreases of yie...
Grapevine under deficit irrigation: hints from physiological and molecular data
Chaves, M.M.; Zarrouk, O.; Francisco, R.; Costa, J.M.; Santos, T.; Regalado, A.P.; Rodrigues, M.L.; Lopes, C.M.Background - A large proportion of vineyards are located in regions with seasonal drought (e.g. Mediterraneantype climates) where soil and atmospheric water deficits, together with high temperatures, exert large constraints on yield and quality. The increasing demand for vineyard irrigation requires an improvement in the efficiency of water use. Deficit irrigation has emerged as a potential strategy to allow c...
Caracterização de produtos de deterioração do betão por métodos petrográficos
A. P. Rodrigues; I. Fernandes; F. NoronhaThis study aimed to characterize the products of deterioration of concrete by petrographic methods. Samples from seven concrete structures as well as three samples produced in laboratory tests were studied. The external evidence of deterioration of the structures were confirmed by petrographic microscope and analysis by scanning electron microscope / spectrometer energy dispersion lead to the identification of ...
Composição química de espécies herbáceas e arbustivas da vegetação secundária c...
CAMARÃO, A. P.; RODRIGUES FILHO, J. A.; CARVALHO, C. J. R. de; FONTENELLE, D. S.2009 ; Disponível também on-line.
Polinização manual em abóboras.
ROMANO, C, M.; STUMPF, E. R. T.; BARBIERI, R. L.; BEVILAQUA, G. A. P.; RODRIGUES, W. F.2008
Manejo de capineiras de capim-elefante (Pennisetum purpureum Schum. cv. Cameroo...
GONÇALVES, C. A.; AZEVEDO, G. P. C. de; CAMARÃO, A. P.; RODRIGUES FILHO, J. A.2006
Expression of Lupinus albus PR-10 proteins during root and leaf development
Pinto, Paula; Ribeiro, A.; Regalado, A. P.; Rodrigues-Pousada, C.; Ricardo, C. P. P.Based on the NH2-terminal sequence of three PR-10 isoforms previously identified in Lupinus albus leaves and a conserved amino-acid region in the PR-10 proteins from leguminosae, a pair of oligonucleotides was designed and used to amplify the corresponding cDNA fragment from a L. albus leaves cDNA library. A fragment of DNA of 200 bp was isolated from the polymerase chain reaction (PCR) mixture and subsequently...
A resposta experimental e a simulação numérica de placas submetidas ao impacto ...
Lopes, H.; Guedes, R.M.; Vaz, M.A.P.; Rodrigues, J.D.Neste trabalho e apresentado um estudo numerico e experimental do impacto de uma massa numa placa de aluminio. A resposta transiente da placa a impactos de baixa velocidade e caracterizada pela propagação de ondas de flexiio. Para sucessivos instantes de tempo foi medido o campo de deslocamentos fora do plano atraves da tecnica de ESPI em modo de dupla exposição. Durante o impacto e registada a evolur;Cio da fo...
Study of transient wave propagation in plates using double pulse TV holography
Lopes, H.; Guedes, R.M.; Vaz, M.A.P.; Rodrigues, J.D.This work presents a numerical and experimental study of the transient response of an isotropic plate. A low mass impact is used to generate the bending wave propagation. Displacements due to the bending wave propagation were assessed using an out-of-plane double pulse TV holography set-up. A PZT transducer is used to record the impact force and its temporal evolution. A novel experimental technique is present...
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