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Showing 1 to 20 of 20 for “"hydrodynamic radius"”.
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A Fluorescence Correlation Spectroscopy Study of the Cryoprotective Mechanism of Glucose on Hemocyanin
… this scheme, one would expect an increase in the hydrodynamic radius with increasing sugar concentration. In order to test this hypothesis, two-photon fluorescence correlation spectroscopy (FCS) was used to measure the hydrodynamic radius of hemocyanin (Hc), an oxygen-carrying protein found in …
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Elaboration of micelle formation in aqueous and two phase solutions by surface active phosphines
… experiments were used to determine the hydrodynamic radius of the aggregates. Fluorescence, conductivity, and surface tension experiments were used to measure the critical micelle concentration of these aggregates. Fluorescence experiments, using a quencher and probe analysis, show the …
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Investigating Protein Properties via Microfluidic Techniques
… by measuring the variation of hydrody- namic radius of bovine serum albumin (BSA) in aqueous solution as a function of pH. By simulating the behaviour of folded and unfolded BSA, the relative population of BSA in dif- ferent states can be calculated. In addition, the key residues that regulate …
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Probing metal nanoparticles and assemblies with analytical ultracentrifugation
… distribution, ligand shell density, shape, and hydrodynamic radius. It can also be used to probe complex mixtures of nanoparticle assemblies, from 2D dimers and chains, to 3D trimers, tetramers, and higher order assemblies, from a consideration of their hydrodynamic shape factor and its relation …
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Cation and Anion Transport in a Dicationic Imidazolium-Based Plastic Crystal Ion Conductor
… coefficient and previously reported PF6- hydrodynamic radius (rH), viscous (" = 4.1 Pa " s) ionic liquid (IL) is present with a cation rH of 0.34 nm. NMR measurements are very powerful in elucidating fundamental OIPC properties and allow a deeper understanding of ion transport within such …
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Magnetic microparticle trapping and mechanical excitation using domain walls in magnetic microstructures
… reliably distinguish particles of different hydrodynamic radius. This work has also helped identify and address some of the obstacles to improve the reliability of these resonance measurements as indicators of particle size. By demonstrating this detection capability, we can proceed with the …
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Physicochemical characterization of PEG-based comb-like amphiphilic copolymer structures for possible imaging and therapeutic applications
… - small micelles and large secondary aggregates. Hydrodynamic radius of micelles did not change with polymer concentration, PEG length, sample preparation method, or time after sample preparation. Large secondary aggregates were most likely compound micelles. Sample preparation method, polymer …
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Multiscale Transport and Dynamics in Ion-Dense Organic Electrolytes and Copolymer Micelles
… micelle (to mimic, e.g., drug loading) on the hydrodynamic radius (rH) and polymer chain dynamics. In particular, I present spin-lattice relaxation (T1) results that directly measure single chain exchange rate kexch between micelles and diffusion results that inform on the unimer exchange …
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Physical and biological factors affecting oxygen transfer in the activated sludge wastewater treatment process
… the OTE. Filamentous organisms increase the hydrodynamic radius of suspended particles, which dilates mixed liquor apparent viscosity (µ<sub>app</sub>) and impedes mass transfer. For example, an increase in the SFL from 3.8 x 10<sup>10</sup> to 2.7 x 10<sup>11</sup> µm g<sup>-1</sup> resulted …
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Structure, Dynamics and Association of Thermosensitive Core-Shell Particles
… by DLS and Cryo-TEM demonstrates that the hydrodynamic radius provides a valid measure for the size of the particles. The phase transition in the PNIPAM network has been for the first time directly imaged by cryo-TEM. A quantitative method was developed to access quantitative information …
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Free solution electrophoresis measurements and their theoretical relationships to net protein valence
… light scattering were used to verify that the hydrodynamic radius was constant for a given series of charge mutants. Furthermore, this work compares the model predictions of Debye-Huckel-Henry (DHH), Booth, and the more recent boundary element (BE) modeling by Allison with experimental …
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Synthesis and Surface Characterization of Silica-Polypeptide Composite Particles
… of tetraethyl orthosilicate (TEOS). The hydrodynamic radius can be easily controlled in the range of ƒî 20-140 nm by the water/TEOS ratio in the starting reaction mixture. The surface of the synthesized silica cores was further passivated/functionalized (P/F) by a mixture of …
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The Influence of Nonadsorbed Polymer on the Behavior of Weakly Flocculated Suspensions
… ($\delta$) was assumed to be equivalent to the hydrodynamic radius ($\approx$11.6 nm) of the PMMA coils. In the absence of excess PMMA, suspensions exhibited strong shear thinning and low shear relative viscosities ($\eta\sb{\rm rel,0}$) in excess of 10$\sp4$, indicative of their weakly …
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Dynamics of nanoparticles in complex fluids.
… (FCS). In our experiments, the particle radius (R ≈ 2.5 nm) was much smaller compared to the radius of gyration of the chain but comparable to the average mesh size of the fluctuating polymer network. The diffusion coefficient (D) of the particles decreased monotonically with polymer …
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Novel Fluorescence Techniques to Probe Protein Aggregation
… scale, the diffusion coefficient, and thus hydrodynamic radius, of species may be determined. The technique delivers much greater sensitivity for size quantification, allowing scarce and other challenging samples to be characterised, and provides significant steps towards accurate sizing for …
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Star-shaped Polyelectrolytes
… to a divalent counterion. Simultanously the hydrodynamic radius increases upon irradiation. Finally the thermoresponsive properties of aqueous solutions of star-shaped PDMAEMA were investigated. PDMAEMA is both pH-sensitive as temperature-sensitive, showing a miscibility gap at higher …
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Investigating Cold Adaptation of Intrinsically Disordered Proteins in p53 Homologs
No abstract prepared.
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Single Molecule Study of Polymer-Surfactant Interactions
… value obtained from ‘classical methods’. The hydrodynamic radius of SDS micelle around CMC is found to be ~ 2.0 nm. The shape of the autocorrelation curves and number of dye particles in the focal volume also supports to follow the SDS micelle. When varying the concentration of MC, slight …
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The structure and kinetics of oil-in-water microemulsions stabilised by nonionic surfactants
… individual droplets at their preferred size. The hydrodynamic radius (rh) of the droplet at the SPB was used to calculate the area (As) occupied per surfactant molecule at the interface between the droplet core and the surfactant monolayer. As was found to be increased by increasing n, and …
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Investigating alternative delivery systems for self-Amplifying RNA vaccines
… according to their physico-chemical properties: hydrodynamic radius, sample homogeneity (polydispersity index - PDI) and surface charge. Furthermore, in vitro activity was investigated using three different cell lines:bone marrow derived macrophages (BMDM), bone marrow derived dendritic cells …