منابع مشابه
Molecular structure from X-ray diffraction
While there are some developments in structure solution and refinement, these represent gradual improvements rather than fundamental leaps in methodology. An exception is the assessment of crystal quality by X-ray diffraction topography using a dedicated solid-state electronic detector; this is an elegant example where the precise physical nature of the crystal has been studied and analyzed. Si...
متن کامل3 Molecular structure from X-ray diffraction
Recent developments in the determination of molecular structures from X-ray diffraction data are discussed. While the problems associated with chemical crystallography using single crystals have largely been solved, those with structure from powders and of macromolecules are still the subjects of active research. New and improved methods in structure determination in both these fields dominated...
متن کاملEVALUATION OFDISLOCATION STRUCTURE AND CRYSTALLITE SIZE IN WORN AL-SI ALLOY BY X-RAY DIFFRACTION
Abstract: powerful method for the characterization of microstructures of crystalline materials in terms of crystallite size anddislocation structures. In this paper the effect of the sliding on the microstructure of A356 in the as-cast and heattreated conditions are studied, The X-ray phase analysis shows that with increasing applied load, the dislocationdensity is increased, whereas the crysta...
متن کاملX-ray diffraction from microtubules.
X-ray diffraction patterns from sperm-tail microtubules indicate that subunits with a 40 to 50 A packing diameter form filaments, alternately half-staggered, parallel to the tubule axis. A 12-or a 13-stranded structure fits best with the X-ray diagram. The strongest bonding is that between units within a longitudinal filament; the weaker lateral interactions are disrupted by drying. Microtubule...
متن کاملNatural and synthetic prion structure from X-ray fiber diffraction.
A conformational isoform of the mammalian prion protein (PrP(Sc)) is the sole component of the infectious pathogen that causes the prion diseases. We have obtained X-ray fiber diffraction patterns from infectious prions that show cross-beta diffraction: meridional intensity at 4.8 A resolution, indicating the presence of beta strands running approximately at right angles to the filament axis an...
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ژورنال
عنوان ژورنال: Journal of Biological Physics
سال: 2003
ISSN: 0092-0606
DOI: 10.1023/a:1027310719146