Fibre diffraction

Greenall, R., Fuller, W. High Angle Fibre Diffraction Studies on Conformational Transitions DNA Using Synchrotron Radiation. 151, 31-59 (1989). 

DeMarco, M. L., and Daggett, V. (2004). From conversion to aggregation Protofibril formation of the prion protein. Proc. Natl. Acad. Sci. USA 101, 2293-2298. Diaz-Avalos, R., Long, C., Fontano, E., Balbirnie, M., Grothe, R., Eisenberg, D., and Caspar, D. L. D. (2003). Cross-beta structure of an amyloid-forming peptide studied by electron nano-crystallography. Fibre Diffract. Rev. 11, 79-86. 

Inouye, H., and Kirschner, D. A. (2003). X-ray fibre diffraction analysis of assemblies formed by prion-related peptides Polymorphism of the heterodimer interface between PrPC and PrPSc. Fibre Diffract. Rev. 11, 102-112. 

Wess, T. J., Alberts, I., Cameron, G., et al. (2002). Small angle X-ray scattering reveals changes of bone mineral habit and size in archaeological samples. Fibre Diffraction... 

The program, AXIS, was specifically designed to analyse fibre diffraction patterns similar to that shown in Figure 1, although some of the methods described in this chapter may be extended to other types of pattern if required. The fibre patterns are recorded on flat film using pinhole collimated, nickel-filtered CuKor radiation, and finely powdered calcite is dusted onto the specimen to provide a calibration ring of spacing 0.3035 nm. 

Recent advances in the methods used for evaluating fibre diffraction patterns place importance on matching the whole pattern (16). The methods used for calculating the scattering for the models described above could be extended to model the amorphous part of the pattern prior to subtraction or matching the calculated structure. 

Methods were discussed to reveal texture in plant materials in situ by X-ray diffraction. A uniform texture in plant materials is generally confined to areas of microscopic dimensions, and the oriented materials are normally of poor crystallinity. Special methods are therefore needed to obtain fibre diffraction from such areas. They may be distinguished as microbeam techniques, artificial orientation of micro-areas, chemical methods improving crystallinity in oriented but poorly crystalline materials, and combinations of these possibilities. 

Improvement of fibre diffraction by chemical means was exampled by the results obtained with hydrolytic and other extractions of fungal tissue, in particular with reference to the (1-3)-/ -D-glucan component in the fibrous mycelial ropes (rhizomorphs) of Armillaria mellea. The rhizomorphs in the native state produce only one, oriented but diffuse and weak spacing attributable to (1-3)--D-glucan. After the adequate chemical extractions they yielded a complete fibre... 

Chandrasekaran, R., and Stubbs, G. (2001). Fibre diffraction Kluwer, Dordrecht. 

Muller M, Czihak C, Burghammer M, and Riekel C. Combined x-ray microbeam small-angle scattering and fibre diffraction experiments on single native cellulose fibres. J. Appl. Crystallogr., 2000 33 817-819. 

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