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Processing and properties of natural fibers reinforced thermoplastic and thermo...
Silva, J. F.; Nunes, J. P.; Duro, A. C.; Castro, B. F.In this work, three different natural fibers were studied and characterized, using optical and SEM microscopy. Woven fabrics of those reinforcement fibers were used to reinforce polyester and epoxy matrices and produce composite plates by vacum lay-up. Also, using an experimental piston blender equipment, long fiber reinforced PLA (LFT) composites were manufactured by hot compression molding. All different obta...
Processing and properties of composites obtained from natural fibres and thermo...
Duro, A. C.; Castro, B. F.; Silva, J. F.; Nunes, J. P.In this work, different natural fibres were studied and characterized, using optical and SEM microscopy. Those fibres were used to reinforce polyester and epoxy matrices and produce composite plates by hand lay-up. A vacuum bag was then used to allow improving the fibre impregnation, establishing a controlled pressure atmosphere. All different obtained composite plates were submitted to mechanical testing, in o...
Development and assessment to environmentally friendly natural fiber composites
Nunes, J. P.; Castro, B. F.; Duro, A. C.; Silva, J. F.; Oliveira, LuísTwo different types of natural fibers (jute and sisal) were studied and characterized, using optical microscopy, pycnometry density, single filament and linear density tests. Jute fibers were processed into composite parts from woven fabrics raw-material and sisal fibers were also processed into final composite componentes but in the form of chopped mat. Those fibers were used to reinforce polyester and epoxy m...
Distribution of SDF1-3'A polymorphisms in three different ethnic groups from Br...
Grimaldi,Rogerio; Acosta,AX; Machado,TMB; Bomfim,TF; Galvão-Castro,BA mutation described as a G-to-A transition has been reported in SDF-1 gene (SDF1-3'A), being prevalent in all ethnic groups, except in Africans. This mutation is associated with the onset of AIDS progression. Our aim was to identify the frequency of this allele in different groups from Brazil: Tiriyó and Waiampi Amerindian tribes (Asian ancestry); selected blood donors from Joinville (German descendents); and ...
Microbiota bacteriana em segmentos de mosca do estábulo Stomoxys calcitrans no ...
Castro,B.G.; Souza,M.M.S.; Bittencourt,A.J.This study report the first description of bacterial species recovered from body segments of Stomoxys calcitrans collected in dairy farms from Rio de Janeiro State, Brazil. Eighteen out of 33 isolated and identified species were unknown in stable flies by the worldwide literature. Some of these species have the potential to develop diseases in man and other animals and some others have not been described yet as...
Liquid-liquid equilibrium of water + PEG 8000 + magnesium sulfate or sodium sul...
Castro,B. D.; Aznar,M.Liquid-liquid extraction using aqueous two-phase systems is a highly efficient technique for separation and purification of biomolecules due to the mild properties of both liquid phases. Reliable data on the phase behavior of these systems are essential for the design and operation of new separation processes; several authors reported phase diagrams for polymer-polymer systems, but data on polymer-salt systems ...
HIV-1 Polymorphism: a Challenge for Vaccine Development - A Review
Morgado,MG; Guimarães,ML; Galvão-Castro,BThe perspective for the development of anti-HIV/AIDS vaccines became a target sought by several research groups and pharmaceutical companies. However, the complex virus biology in addition to a striking genetic variability and the limited understanding of the immunological correlates of protection have made this an enormous scientific challenge not overcome so far. In this review we presented an updating of HIV...
Spectroelectrochemical characterisation of a poly[Ni(saltMe)] modified electrode
Vilas-Boas, Miguel; Freire, C.; Castro, B.; Christensen, P.A.; Hillman, A.R.Electrogenerated polymers based on the nickel(II) compIex 2,3-dimetbyl- N,N -bis(salicylidene )butane-2,3- diaminatoniekel(II), poly[Ni(saltMe)], were characterized by in situ FTIR and UV/Vis spectroscopy and ex-situ EPR spectroscopy in order to gain insights into film structure, electronic states and charge conduction. The role of the nickel ions during film oxidation was probed by using EPR to study naturally...
Descrição histológica de gônadas de traíra Hoplias malabaricus (Bloch) (Osteich...
Marques,Débora K.S.; Rosa,Ierecê de Lucena; Gurgel,Hélio de Castro B.The reproductive cycle of Hoplias malabaricus Bloch, 1794, was studied through histological preparations, based on 102 specimens collected in the Gramame reservoir, Paraiba State, from August 1993 to July 1994. Seven developmental stages were identified for the feminine gametes and five for the masculine gametes.
Structural study of the interaction of vanadate with the ligand 1,2-dimethyl-3-...
Castro, M. M. C. A.; Geraldes, C. F. G. C.; Gameiro, P.; Pereira, E.; Castro, B.; Rangel, M.The interaction of vanadate with the ligand 1,2-dimethyl-3-hydroxy-4-pyridinone (Hdmpp) was studied in aqueous solution using a combination of multinuclear NMR and EPR spectroscopies, as well as potentiometry and cyclic voltammetry. The different species in solution were identified and characterized, and their pKa values and stability constants determined. The vanadium complexes formed in solution are strongly ...
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