Static Light Scattering
Mostrando 1-12 de 24 artigos, teses e dissertações.
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1. A Novel In Silico Monte Carlo Approach to Optimize a PSD Estimation Problem. Generation of Data Fusion Experiment Rules
ABSTRACT This article analyzes the performance of combining information from Scanning Electron Microscopy (SEM) micrographs with Static Light Scattering (SLS) measurements for retrieving the so-called Particle Size Distribution (PSD) in terms of experimental features. The corresponding data fusion is implemented using a novel Monte Carlo-based method consist
Trends in Computational and Applied Mathematics. Publicado em: 2022
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2. Análise de geometrias com curvas fechadas no tempo / Analysis of Geometries with Closed Timelike Curves.
This work deals with the analysis of cylindrically symmetric and stationary space-times Ct with closed timelike curves. The equation of motion describing the evolution of a massive scalar field in a Ct space-time is obtained. A class of space-times with closed timelike curves describing cosmic strings and cylinders is studied in detail. In such space-times,
Publicado em: 2010
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3. Protein decorated Nanoparticules : Small Unilamellar Lipid Vesicules and Block Copolymers Micelles. / Nanoparticules Décorées par des Protéines : Vésicules Lipidiques Unilamellaires et Micelies à Base de Copolymères à Blocs
The formation of protein Annexin-A5 decorated (bio-functionalized) nanoparticles is of particular interest in micelle-mediated target drug delivery, in vivo magnetic resonance imaging, or controlled fabrication of biochips. This work describes an easy access to the synthesis and manipulation of block copolymer nano-objects exhibiting binding ability for the
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/07/2008
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4. Estudos de interação de β2-glicoproteína I em solução aquosa e com interfaces lipídicas / Study of interaction between β2- glycoprotein I in aqueous solution and with lipid interfaces
β2GPI is a blood glycoprotein circulating free or bound to lipoproteins. β2GPI adsorbs to negatively charged surfaces, acting as anticoagulant and modulator of inflammation. This work was designed to characterize the interaction between protein molecules and among protein molecules and lipid surfaces. The β2GPI SDS-PAGE and immunoblot revealed
Publicado em: 2008
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5. Interaction of hidrophilic porphyrins and extracellular hemoglobin with biomimetic models of biological membranes / Interação de porfirinas hidrofílicas e de hemoglobina extracelular com modelos biomiméticos de membrana biológica
In the first part of this work interactions of the cationic meso tetrakis (4-N-methilpyridil) porphyrin (TMPyP) and meso-tetrakis (4-sulfonatophenyl) porphyrin (TPPS4) in the free base forms with membrane model systems (ionic micelles, mixed micelles and phospholipids vesicles) in aqueous solutions, have been investigated by optical absorption, resonance lig
Publicado em: 2008
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6. Caracterização por ressonância magnética nuclear da celulose bacteriana acetilada em solução de dimetilacetamida/cloreto de lítio
Cellulose consists of an insoluble polysaccharide, used in industrial scale for manufacture of paper, films, or in the dust form, natural, hydrolyzed or derivatized. Bacterial cellulose, mainly produced by the bacterium Acetobacter xylinum, is identical to the vegetal one, but free of lignin and hemicellulose, wuich eliminates severe chemical processes of pu
Publicado em: 2008
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7. Pressure-induced dissociation of casein micelles: size distribution and effect of temperature
Pressure-induced dissociation of a turbid solution of casein micelles was studied in situ in static and dynamic light scattering experiments. We show that at high pressure casein micelles decompose into small fragments comparable in size to casein monomers. At intermediate pressure we observe particles measuring 15 to 20 nm in diameter. The stability against
Brazilian Journal of Medical and Biological Research. Publicado em: 2005-08
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8. Proteins with mechanical functionality: a physico-chemical study on the viscoelasticity of gliadin, a storage protein from wheat gluten / Proteínas com funcionalidade mecânica: um estudo físico-químico sobre a viscoelasticidade da gliadina, uma proteína de reserva do glúten do trigo
The thesis consisted in a rheological study of the dynamics of gels and dispersions of gliadin from wheat gluten in pure dimethylsulfoxide, dimethylformamide or formamide and in their mixtures with water. The effect of temperature and that of the concentration of the component species (protein and solvent constituents) on flow behavior and deformation were e
Publicado em: 2004
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9. Salt effects on the structure and internal dynamics of superhelical DNAs studied by light scattering and Brownian dynamics.
Using laser light scattering, we have measured the static and dynamic structure factor of two different superhelical DNAs, p1868 (1868 bp) and simian virus 40 (SV40) (5243 bp), in dilute aqueous solution at salt concentrations between 1 mM and 3 M NaCl. For both DNA molecules, Brownian dynamics (BD) simulations were also performed, using a previously describ
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10. A Stopped-Flow Apparatus with Light-Scattering Detection and Its Application to Biochemical Reactions
A stopped-flow apparatus utilizing light-scattering for following the progress of a reaction is described. The method is applicable to all reactions that result in a significant change of the average molecular weight. It was possible due to several modifications of a conventional stopped-flow system to obtain a sensitivity comparable to that of commercial in
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11. Kinetics of Sodium Dodecyl Sulfate Solubilization of Mycoplasma laidlawii Plasma Membranes
The kinetics of sodium dodecyl sulfate solubilization of aqueous suspensions of Mycoplasma laidlawii membranes have been investigated by light scattering in a stopped-flow apparatus. There was evidence of direct interaction between the membranes and sodium dodecyl sulfate micelles above the critical micelle concentration, although of lower order kinetically
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12. Teaching light scattering spectroscopy: the dimension and shape of tobacco mosaic virus.
The tobacco mosaic virus is used as a model molecular assembly to illustrate the basic potentialities of light scattering techniques (both static and dynamic) to undergraduates. The work has two objectives: a pedagogic one (introducing light scattering to undergraduate students) and a scientific one (stabilization of the virus molecular assembly structure by