Encontrados 19 documentos, a visualizar página 1 de 2
Development of nickel-based magnetoliposomes
Rodrigues, Ana Rita O.; Almeida, B. G.; Gomes, I. Tarroso; Araújo, J. P.; Castanheira, Elisabete M. S.; Coutinho, Paulo J. G.Liposomes entrapping nickel-based magnetic nanoparticles (magnetoliposomes) were prepared and characterized.
Extensive beef cattle production in Portugal
Araújo, J.P.; Cerqueira, J.; Vaz, P.S.; Andrade, L.P.; Rodrigues, J.P.V.; Rodrigues, A.M.Portugal, located in the Mediterranean region, one of the "Hot Spot" of the planet, has a huge variability in terms of topography, soils, climate, agriculture, traditions, resulting in a high diversity of animal genetic resources, represented by 15 native cattle breeds, most of them threatened. A significant percentage of extensive beef cattle production in Portugal is based on the use of animals, differing fro...
Magnetoliposomes based on magnetite nanoparticles
Castanheira, Elisabete M. S.; Mendes, Pedro M. F.; Coutinho, Paulo J. G.; Almeida, B. G.; Gomes, I.Tarroso; Araújo, J. P.In this work, magnetic nanoparticles of magnetite were prepared by soft chemical methods, using different surfactants as templating media. These nanoparticles were either covered with a lipid bilayer, forming dry magnetoliposomes, or entrapped in liposomes - aqueous magnetoliposomes.
Magnetoliposomes based on nickel/silica core/shell nanoparticles
Rodrigues, Ana Rita O.; Castanheira, Elisabete M. S.; Coutinho, Paulo J. G.; Almeida, B. G.; Gomes, I.Tarroso; Araújo, J. P.In this work, magnetic nanoparticles of nickel core with silica shell were prepared by soft chemical methods, using tetraethyl orthosilicate (TEOS) and different surfactants as templating media. These nanoparticles were either covered with a lipid bilayer or entrapped in liposomes.
Pr 0.5 Ca 0.5 MnO 3 thin films deposited on LiNbO 3 substrates
Gomes, I. Tarroso; Almeida, B. G.; Araújo, J. P.Thin films of Pr 0.5 Ca 0.5 MnO 3 have been deposited on z-cut LiNbO 3 by pulsed laser ablation. The X-ray diffraction measurements showed that the films have grown highly oriented on LiNbO 3 , with a pseudocubic (111) preferred growth direction. The thicknesses of the films, measured by low angle X-ray reflectivity, are between 13 and 140 nm. Their electrical resistivity present a...
Magnetic and transport properties of diluted granular multilayers
Silva, H. G.; Gomes, Henrique L.; Pogorelov, Y. G.; Pereira, L. M. C.; Kakazei, G. N.; Sousa, J. B.; Araújo, J. P.; Mariano, J. F. L.; Cardoso, S.The magnetic and transport properties of Co80Fe20t /Al2O34 nm multilayers with low nominal thicknesses t=0.7 and 0.9 nm of Co80Fe20 granular layers are studied. Magnetic studies find a superparamagnetic state above the blocking temperature Tb of field-cooled/zero-field-cooled splitting that grows with t and decreases with H. The low-voltage Ohmic tunnel transport passes to non-Ohmic IV3/2 law for applied fields...
Resistive switching in nanostructured thin films
Silva, H. G.; Gomes, Henrique L.; Pogorelov, Y. G.; Stallinga, Peter; De Leeuw, Dago M.; Araújo, J. P.; Sousa, J. B.; Meskers, S. C. J.; Kakazei, G. N.Planar capacitor structures based on granular films composed of nanometric ferromagnetic grains embedded in an insulating Al2O3 matrix can switch between a high-conductance and a low-conductance state. The switching properties are induced by a forming process. The ON/OFF resistance ratio is as high as 104 under an electrical field of only 15 kV/m. This resistive switching is accompanied by a capacitive switchin...
Consequências do plantio de sementes oriundas de plantas enxertadas ("clones") ...
CRISÓSTOMO, J. R.; GADÊLHA, J. W. R.; ARAÚJO, J. P. P. de; BARROS, L. de M.Heterogeneidade da planta, castanha e amêndoa. Redução do potencial produtivo, dificuldades de manejo e ineficiência da produção. O que o produtor pode fazer para solucionar tais problemas. ; 1992
Situacao atual e perspectivas da cajucultura brasileira.
ARAUJO, J. P. P. de.Situacao atual e perspectivas da cajucultura brasileira. ; 1990
A cultura da melancia (Citrullus lanatus).
ARAUJO, J. P. de.O estudo aborda a origem, classificação botânica, cultivares, aspectos botânicos, solo, plantio, adubação, tratos culturais, irrigação e tratos fitossanitários. ; 1989 ; FL 09682
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