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Polymer Characterization and Spectroscopy

The information available from fibre X-ray diffraction is generally inadequate for the determination of the position of atoms unless known features of the polymer structure are incorporated in the analysis. In the linked atom least [Pg.434]

Carotbers, in Structure-Solubility Relationships in Polymers , ed. F. W. Harris and R. B. Seymour, Academic Press, New York, 1977. [Pg.434]

The calculation of molecular weight averages from gel permeation chromatography elution curves is strai tforward by computer if the relationship between molecular weight and elution volume is known, and the results can be made rapidly available. If a column is calibrated for one polymer with narrow molecular weight standards, it may be calibrated by itoative methods for a second polymer if several - samples or just one well-charactnized [Pg.437]

The information represented by the atomic co-ordinates and residue sequences in proteins and nucldc acids is conveniently stored, as in the Protein Data [Pg.438]

Provencher, Makromal. Chem., 1979, 180, 201 Contin Users Manual, European Molecular Biology Laboratory, Heidelberg, 1980. [Pg.365]

Munk has developed a new algorithm for the analysis of sedimentation equilibrium data from a single experiment to obtain the average molecular weight and its polydispersity, providing that the Schultz-Zimm distribution function and a certain thermodynamic behaviour can be assumed. Simultaneous curve fitting to the equilibrium sedimentation data for three different concentrations facilitated the discovery that filamin monomer and dimers are in equilibrium while the tetrane forms irreversibly.  [Pg.367]

Velocity sedimentation profiles of tubulin have been numerically simulated to elucidate the process of its self association induced by vinblastine. For a [Pg.367]

Algorithms for the analysis of thermal denaturation curves of DNA and the computer simulation of the fine structure have been considered in a review. The melting curve of a DNA molecule has been decomposed into components with an assumed Gaussian form, and the melting curve and denaturation map of a DNA of known sequence has been obtained using a modification to the Zimm model, which is designed to reduce numerical instability. A recursion relation technique has been developed and applied to fluctuations in the superhelical structure of DNA, and to elucidate the effect of torsional stress upon DNA helix-coil transition.  [Pg.368]

Konnert s technique for refining the structure of proteins subject to known geometrical constraints has been developed by incorporating restraints on the variances of the interatomic distributions, in order to express the retention of local geometry that accompanies certain modes of motion. As as alternative to the sparse matrix approach, Hoad and Norman have utilized the fast Gauss-Seidel least-squares routine for the refinement of atomic co-ordinates. A comparison has been made of the structures obtained for bovine trypsin (EC 3.4.24.4) by the difference Fourier and real space refinement methods.  [Pg.369]


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