Preformed Polymers
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Pullulan as a stabilizer agent of polymeric nanocapsules for drug delivery
ABSTRACT Polymeric stabilizers have received attention in the preparation of nanostructured systems due to their ability to enhance formulation stability. Considering this, the objective of this work was to prepare poly(ε-caprolactone) nanocapsules using the pullulan as a polymeric stabilizer. The nanocapsules were prepared using the interfacial deposition
Braz. J. Pharm. Sci.. Publicado em: 2016-12
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2. Desenvolvimento tecnológico e avaliação da atividade antioxidante de sistemas nano e microparticulados contendo melatonina / Technological development and evaluation of the antioxidant activity of melatonin-loaded nano- and microparticulated systems
Este trabalho centrou-se no desenvolvimento tecnológico e na caracterização de nanopartículas poliméricas (nanocápsulas ou nanoesferas) contendo melatonina, empregando diferentes composições, métodos de preparação e concentrações de melatonina. De uma maneira geral, as diferentes suspensões nanoparticuladas foram caracterizadas segundo a determ
Publicado em: 2009
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3. Fases estacionárias para cromatografia líquida de alta eficiência em fase reversa (CLAE-FR) baseadas em superfícies de óxidos inorgânicos funcionalizados
Particles of porous silica or other solvent resistent inorganic oxides can be functionalized by aliphatic (e.g., C-8 or C-18) or other groups to give stationary phases for use in reversed phase HPLC. The functionalization can be done by bonding of individual groups to the surface of the support particles, by producing an organic polymeric film from pre-polym
Química Nova. Publicado em: 2002-07
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4. Adenine Nucleotide-dependent Regulation of Assembly of Bacterial Tubulin-like FtsZ by a Hypermorph of Bacterial Actin-like FtsA*S⃞
Cytokinesis in bacteria depends upon the contractile Z ring, which is composed of dynamic polymers of the tubulin homolog FtsZ as well as other membrane-associated proteins such as FtsA, a homolog of actin that is required for membrane attachment of the Z ring and its subsequent constriction. Here we show that a previously characterized hypermorphic muta
American Society for Biochemistry and Molecular Biology.
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5. Image reconstruction of the Alzheimer paired helical filament.
The paired helical filament (PHF) is the principal constituent of the neurofibrillary tangles that occur in the brain in senile dementias of the Alzheimer type. We have previously shown from fragmentation patterns of isolated PHFs that they consist of a regularly repeating subunit, which is axially compact and not an extended fibrous molecule or protofilamen
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6. The formation of spherulites by amyloid fibrils of bovine insulin
Bovine insulin has long been known to self-assemble in vitro into amyloid fibrils. We have observed a further higher-order self-association of the protein into spherical structures, with diameters typically around 50 μm but ranging from 10 to 150 μm. In a polarizing light microscope, these structures exhibit a “Maltese-cross” extinction pattern typical
National Academy of Sciences.
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7. Assembly of biologically active proheads of bacteriophage lambda in vitro.
Bacteriophage lambda DNA can be packaged in vitro into preformed proheads to generate plaque-forming units. This complex set of reactions is initiated when lambda DNA is mixed with the product of the phage A gene, and proheads. Because proheads are an essential early reactant, the system has potential as an assay for the formation of biologically active proh
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8. Rapid and sensitive colorimetric method for visualizing biotin-labeled DNA probes hybridized to DNA or RNA immobilized on nitrocellulose: Bio-blots.
Biotin-labelled DNA probes, prepared by nick-translation in the presence of biotinylated analogs of TTP, are hybridized to DNA or RNA immobilized on nitrocellulose filters. After removal of residual probe, the filters are incubated for 2--5 min with a preformed complex made with avidin-DH (or streptavidin) and biotinylated polymers of intestinal alkaline pho
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9. Unique functional characteristics of the polymerization and MAP binding regulatory domains of plant tubulin.
An understanding of the regulation of microtubule polymerization and dynamics in plant cells requires biochemical information on the structures, functions, and molecular interactions of plant tubulin and microtubule-associated proteins (MAPs) that regulate microtubule function. We have probed the regulatory domain and polymerization domain of purified maize