Core Shell Morphology
Mostrando 13-23 de 23 artigos, teses e dissertações.
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13. Modificação quimica da borracha natural pela tecnica de polimerização em emulsão poe semente : propriedades coloidais, estrutura quimica e comportamento viscoelastico
The chemical modification of natural rubber (NR) by grafting of copolymers in the backbone of the hydrophobic substrate, poly-cis-isoprene, by free radical polymerization, using a seeded emulsion polymerization system, has been demonstrated. Two copolymers were grafted, a hydrophilic of dimethylaminoethylmethacrylate (DMAEMA) or a hydrophobic of methyl metha
Publicado em: 2003
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14. Propriedades mecanicas e termicas, morfologia e reologia de blendas de poliamida-6 e elastomeros
Blends of polyamide-6 (PA-6) and elastomers is the central subject of this thesis. The work can be subdivided in three parts according to the type of rubber used, each part has specific objectives. In the first part, the mechanical properties and phase morphology of ternary blends of polyamide 6 with rubber, e.g., maleated ethylene-propylene random copolymer
Publicado em: 1999
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15. Sintese, estrutura-morfologia e relação com propriedades macroscopicas do modificador de impacto poli (metacrilato de metila-co-butadieno-co estireno), MB&
Poly(vinyl Chloride), PVC, is an of thermoplastics more useful because exhibits many excellent properties, but impact resistence is not one of them. This properties can be improved with the mixture of impact modifiers in the PVC. In this work was studied the synthesis of poly(methyl methacrylate-co-butadiene-co-styrene), MBS, and the effect of his structure
Publicado em: 1993
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16. Chemically induced supramolecular reorganization of triblock copolymer assemblies: Trapping of intermediate states via a shell-crosslinking methodology
The mechanism of morphological phase transitions was studied for rod-shaped supramolecular assemblies comprised of a poly(acrylic acid)-block-poly(methyl acrylate)-block-polystyrene (PAA90-b-PMA80-b-PS100) triblock copolymer in 33% tetrahydrofuran/water after perturbation by reaction with a positively charged water-soluble carbodiimide. Tetrahydrofuran solva
National Academy of Sciences.
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17. Structural Studies of Avian Myeloblastosis Virus: Comparison of Polypeptides in Virion and Core Component by Dodecyl Sulfate-Polyacrylamide Gel Electrophoresis
Two different systems of dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) in separate laboratories detected analogous patterns of dye bands in virions of avian myeloblastosis virus (AMV). At least 11 of the dye bands co-migrated with the major polypeptides reported in Rous sarcoma virus. Particles with the morphology of the AMV core component, o
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18. Isolation and characterization of bacteriophage T4 mutant preheads.
To determine the function of individual gene products in the assembly and maturation of the T4 prehead, we have isolated and characterized aberrant preheads produced by mutations in three of the T4 head genes. Mutants in gene 21, which codes for the T4 maturation proteases, produce rather stable preheads whose morphology and protein composition are consisten
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19. PA-457: A potent HIV inhibitor that disrupts core condensation by targeting a late step in Gag processing
New HIV therapies are urgently needed to address the growing problem of drug resistance. In this article, we characterize the anti-HIV drug candidate 3-O-(3′,3′-dimethylsuccinyl) betulinic acid (PA-457). We show that PA-457 potently inhibits replication of both WT and drug-resistant HIV-1 isolates and demonstrate that the compound acts by disrupting a la
National Academy of Sciences.
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20. Drosophila S virus is a member of the Reoviridae family.
The S character of Drosophila simulans, the absence or malformation or both of bristles and other cuticular structures, was described by Comendador (Drosophila Inf. Serv. 55:26-28, 1980). Its characteristics (maternal transmission, low pathogenicity, and sensitivity to temperature) suggested the existence of a virus as the causative agent. Indeed, reovirusli
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21. Anatomical Analysis of Saccharomyces cerevisiae Stalk-Like Structures Reveals Spatial Organization and Cell Specialization
Recently we reported an unusual multicellular organization in yeast that we termed stalk-like structures. These structures are tall (0.5 to 3 cm long) and narrow (1 to 3 mm in diameter). They are formed in response to UV radiation of cultures spread on high agar concentrations. Here we present an anatomical analysis of the stalks. Microscopic inspection of c
American Society for Microbiology.
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22. Sequential Steps in Human Immunodeficiency Virus Particle Maturation Revealed by Alterations of Individual Gag Polyprotein Cleavage Sites
Retroviruses are produced as immature particles containing structural polyproteins, which are subsequently cleaved by the viral proteinase (PR). Extracellular maturation leads to condensation of the spherical core to a capsid shell formed by the capsid (CA) protein, which encases the genomic RNA complexed with nucleocapsid (NC) proteins. CA and NC are separa
American Society for Microbiology.
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23. Functional Tomographic Fluorescence Imaging of pH Microenvironments in Microbial Biofilms by Use of Silica Nanoparticle Sensors▿ †
Attached bacterial communities can generate three-dimensional (3D) physicochemical gradients that create microenvironments where local conditions are substantially different from those in the surrounding solution. Given their ubiquity in nature and their impacts on issues ranging from water quality to human health, better tools for understanding biofilms and
American Society for Microbiology (ASM).