Quasi Crystals
Mostrando 13-17 de 17 artigos, teses e dissertações.
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13. Protein and virus crystal growth on international microgravity laboratory-2.
Two T = 1 and one T = 3 plant viruses, along with a protein, were crystallized in microgravity during the International Microgravity Laboratory-2 (IML-2) mission in July of 1994. The method used was liquid-liquid diffusion in the European Space Agency's Advanced Protein Crystallization Facility (APCF). Distinctive alterations in the habits of Turnip Yellow M
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14. Field-induced trapping as a probe of dimensionality in molecular crystals
The combined effect of an electric field and reduced dimensionality on the hopping motion of a charge carrier in an anisotropic molecular crystal is determined. New, exact expressions for S(t), the number of distinct sites occupied by a carrier in time t, are presented for two-dimensional and three-dimensional anisotropic lattices. The general results are us
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15. Analysis of conformational parameters in nucleic acid fragments. I. Single crystals of nucleosides and nucleotides.
A study has been undertaken of conformational parameters in single crystal structures of nucleosides and nucleotides using the techniques of helical conformational analysis. A "quasi-helix" was generated from the geometry of base-paired structures, using published data extracted from the Cambridge structural database. A total of 54 base-pairs were found in t
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16. Structural Chemistry of 1,2 Dilauroyl-DL-phosphatidylethanolamine: Molecular Conformation and Intermolecular Packing of Phospholipids
Crystals of 1,2 dilauroyl-DL-phosphatidyl-ethanolamine:acetic acid are monoclinic with a = 46.2, b = 7.77, c = 9.95 Å, β = 92.0°; space group P21/c. The structural analysis, based on the visual estimates of 1467 reflection intensities, was achieved by direct methods, and least squares analysis convergence was to R1 = 0.28. There are marked differences bet
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17. Dissecting the key recognition features of the MS2 bacteriophage translational repression complex.
The MS2 RNA operator capsid offers an unparalleled opportunity to study sequence-specific protein-protein and RNA-protein interactions in molecular detail. RNA molecules encompassing the minimal translational operator recognition elements can be soaked into crystals of RNA-free coat protein shells, allowing the RNA to access the interior of the capsids and m