Quasi-elastic light scattering studies

Heming, T., Djabourov, M., Leblond, J., and Takerkart, G. (1991). Conformation of gelatin chains in aqueous solutions 2. A quasi-elastic light scattering study. Polymer, 32, 3211-3217. 

A major question in protein chemistry is why does one salt (or salt concentration) induce Ctystallization while most other conations lead to precipitation of a concentrated protein solution A quasi-elastic light scattering study of the effect of salts on lysozyme and concanavalin A precipitation concluded that salts that encourage precipitation lead to an increase in macromolecule polydispersity and size... 

M22. Mazer, N. A., Schurtenberg, P., Carey, M. C., Preisig, R., Weigand, K., and Klanzig, W., Quasi-elastic light scattering studies of native hepatic bile from the dog Comparison with aggregative behaviour of model biliary lipid systems. Biochemistry 23, 1994-2005... 

Smits RG, Kuil ME, Mandel M. Quasi elastic light scattering study on solutions of linear flexible polyelectrolytes at low ionic strengths. Macromolecules 1994 27 5599-5608. 

Cellulase causes a random breakdown ot the main chain of the xanthan from Xanthomonas campestris when the polysaccharide is in the ordered conformation. It is shown that there is no hydrolysis on the ordered helical conformation of the polysaccharide. Quasi-elastic light-scattering studies of aqueous solutions of xanthan reveal the existence of two different structural forms characterized by different values of the translational diffusion coefRcient i>f. Xanthan (mol. wt. 2.16 X 10 ) undergoes a self-association in aqueous solution, an effect that is inhibited in 4 m urea solution... 

Kiserow D, Prochazka K, Ramireddy C, Tuzar Z, Mimk P, Webber SE (1992) Fluorometric and quasi-elastic light-scattering study of the solubilization of nonpolar low-molar mass compounds into water-soluble block-copolymer micelles. Mactomolecules 25(l) 461-469. doi 10.1021/ma00027a072... 

I. Nishio and A. Wada, "Quasi-Elastic Light Scattering Study of... 

K. S. Schmitz. Quasi-elastic light scattering studies on T7 DNA in the presence of a sinusoidal electric field. Chem. Phys., 79 (1982), 297-305. 

In this study, has been investigated by means of quasi-elastic light scattering and transient electric birefringence the effect of the quenching concentration on the structure of the PVC aggregates as well as the thermal stability of these aggregates. 

Quasi-elastic light scattering was employed successfully to estimate sizes of molecular assemblies in terms of hydrodynamic radius, R . In the present paper, we concentrated on a "phase diagrammatic" study of molecular assembly size. 

A recent study has employed the new technique of quasi-elastic light scattering for estimation of diffusion constants (257). The result for the native enzyme at 24° is in close agreement with the data given in the tabulation. The value of D as a function of temperature was measured through the thermal transition. The method was also used to follow the kinetics of the urea-induced transition. 

Detailed studies of micellar size and shape using quasi-elastic light scattering have recently been presented for sodium dodecylsulfate33. To reduce the influence... 

Recently, a four-laboratory cooperative study has led to a comparison of the determination of particle size distribution by electron microscopy, quasi-elastic light scattering and wide angle light scattering (20). 

Using Quasi-Elastic Light Scattering To Study Particle Size Distributions in Submicrometer Emulsion Systems... 

Quasi-elastic light scattering is an excellent technique for studying the formation and stability of submicrometer emulsions. Improvements in the methods of quasi-elastic light scattering data acquisition and analysis that enable full particle-size distribution studies of sub-micrometer emulsion systems are discussed. Using several oil/water emulsion systems as examples, we demonstrate the ability of these techniques to determine the effect of emulsifier concentration on the particle-size distribution produced by an inversion method of emulsification. Some of the benefits of obtaining the full distribution are also discussed. 

Among bile salts, sodium cholate (NaC) and sodium deoxycholate (NaDC) have been extensively studied by a variety of physical techniques. A few prominent techniques include nuclear magnetic resonance [68], electron spin resonance [69], small angle X-ray scattering [70], and quasi-elastic light scattering [71]. 

Tanaka, Hocker, and Benedek first realized this essential nature of gds and developed a theory of the dynamics of gel networks [16]. According to their theory the quasi-elastic light scattering from gel networks became one of the standard methods of studying polymer gels. Here we briefly outline the theory of the dynamics of gels. 

Schematic models for the expanded structure of bile acid-phosphatidylcholine mixed micelles are shown in Fig. 2B. The original model was proposed by Small in 1967 (S36). In this model the mixed micelle consisted of a phospholipid bilayer disk surrounded on its perimeter by bile acid molecules, which were oriented with their hydrophilic surhices in contact with aqueous solvent and their hydrophobic sur ces interacting with the hydrocarbon chains of the phosphohpid molecules. This model has recently been revised, based on further studies of mixed micelles using quasi-elastic light scattering spectroscopy (M20). In a new model for the molecular structure of bile acid-phospholipid mixed micelles. Mazer et al. (M20) propose a mixed disk, in which bile acids are found not only on the perimeter of phospholipid bilayers, but also incorporated within their interior in high concentrations (Fig. 2B). The size of these mixed micelles was estimated to be as high as 200 to 400 A in radius in some solutions, and disk-shaped particles in this size range were observed by transmission electron microscopy (M20). Micellar aggregates similar in size and structure to those found in model bile solutions have been demonstrated in dog bile (M22).

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