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Fibre diffraction
International Tables for Crystallography (2012). Vol. F, ch. 19.5, pp. 583-592 [ doi:10.1107/97809553602060000871 ]
... to describe helical molecules. In real space we use coordinates (r, [varphi], z); in reciprocal space (R, [psi], Z). By convention, the z axis is the ... coordinates of a point in the first repeating unit are (r, [varphi], z), then applying the helical symmetry gives the ...
Helical viruses and bacteriophages
International Tables for Crystallography (2012). Vol. F, Section 19.5.8.4, pp. 589-590 [ doi:10.1107/97809553602060000871 ]
... refined by restrained least-squares or molecular-dynamics methods to R values of less than 0.10 at resolutions between 2.9 and ... Symmons, M. F., Sturtevant, J. M., Marvin, D. A. & Perham, R. N. (1998). Structure of the capsid of Pf3 filamentous ... at 3.1Å resolution. J. Mol. Biol. 283, 155-177. Bryan, R. K., Bansal, M., Folkhard, W., Nave, C. & Marvin, D. ...
[more results from section 19.5.8 in volume F]
Evaluation
International Tables for Crystallography (2012). Vol. F, Section 19.5.7.7, p. 588 [ doi:10.1107/97809553602060000871 ]
... crystallography, fibre structures are evaluated by statistical measures, such as R values, and by the examination of difference maps. Fibre-diffraction R values are inherently lower than those expected in crystallography, particularly ... superposed by cylindrical averaging (Stubbs, 1989). The largest likely R value for noncrystalline TMV at 3Å resolution is about ...
[more results from section 19.5.7 in volume F]
Integration of continuous data
International Tables for Crystallography (2012). Vol. F, Section 19.5.6.5, p. 586 [ doi:10.1107/97809553602060000871 ]
... In diffraction from noncrystalline fibres, intensity is a function of R on each layer line. Angular deconvolution (Makowski, 1978; Namba & Stubbs ... partially oriented specimens. J. Appl. Cryst. 11, 273-283. Millane, R. P. & Arnott, S. (1986). Digital processing of X-ray ...
[more results from section 19.5.6 in volume F]
Data collection
International Tables for Crystallography (2012). Vol. F, Section 19.5.5, p. 585 [ doi:10.1107/97809553602060000871 ]
... 1998) are now generally used for final data collection (Janaswamy & Chandrasekaran, 2005, 2006; Tsuruta & Irving, 2008), taking advantage of reduced exposure ... region are collected by tilting the fibre. References Janaswamy, S. & Chandrasekaran, R. (2005). Cation induced polymorphism in iota-carrageenan. Carbohydr. ...
Fibre preparation
International Tables for Crystallography (2012). Vol. F, Section 19.5.4, p. 585 [ doi:10.1107/97809553602060000871 ]
... heating while forming polymer films (Arnott, Guss et al., 1974; Chandrasekaran, Radha, Lee & Zhang, 1994). A drop of concentrated polymer ... Conformation of keratan sulphate. J. Mol. Biol. 88, 175-184. Chandrasekaran, R., Radha, A., Lee, E. J. & Zhang, M. (1994). ...
Diffracted intensities: polycrystalline fibres
International Tables for Crystallography (2012). Vol. F, Section 19.5.3.6, pp. 584-585 [ doi:10.1107/97809553602060000871 ]
... lateral organization of the polymers, intensities are observed at discrete R values defined by the reciprocal-lattice points. In the case ... upon the unit-cell dimensions, other reflections having the same R value may also be superposed to give a single intensity, and those having R values close to each other may be difficult to ...
[more results from section 19.5.3 in volume F]
Types of fibres
International Tables for Crystallography (2012). Vol. F, Section 19.5.2, pp. 583-584 [ doi:10.1107/97809553602060000871 ]
... Soc. Symp. Ser. 141, 1-30. Stroud, W. J. & Millane, R. P. (1995). Analysis of disorder in biopolymer fibers. Acta ...
Introduction
International Tables for Crystallography (2012). Vol. F, Section 19.5.1, p. 583 [ doi:10.1107/97809553602060000871 ]
Introduction 19.5.1. Introduction Many biopolymers are long helical structures and have a natural tendency to form fibres. This tendency severely impedes the growth of single crystals from these polymers, and even if crystals can be grown, the molecular interactions in the crystals rarely correspond to the biologically significant interactions in the ...
International Tables for Crystallography (2012). Vol. F, ch. 19.5, pp. 583-592 [ doi:10.1107/97809553602060000871 ]
... to describe helical molecules. In real space we use coordinates (r, [varphi], z); in reciprocal space (R, [psi], Z). By convention, the z axis is the ... coordinates of a point in the first repeating unit are (r, [varphi], z), then applying the helical symmetry gives the ...
Helical viruses and bacteriophages
International Tables for Crystallography (2012). Vol. F, Section 19.5.8.4, pp. 589-590 [ doi:10.1107/97809553602060000871 ]
... refined by restrained least-squares or molecular-dynamics methods to R values of less than 0.10 at resolutions between 2.9 and ... Symmons, M. F., Sturtevant, J. M., Marvin, D. A. & Perham, R. N. (1998). Structure of the capsid of Pf3 filamentous ... at 3.1Å resolution. J. Mol. Biol. 283, 155-177. Bryan, R. K., Bansal, M., Folkhard, W., Nave, C. & Marvin, D. ...
[more results from section 19.5.8 in volume F]
Evaluation
International Tables for Crystallography (2012). Vol. F, Section 19.5.7.7, p. 588 [ doi:10.1107/97809553602060000871 ]
... crystallography, fibre structures are evaluated by statistical measures, such as R values, and by the examination of difference maps. Fibre-diffraction R values are inherently lower than those expected in crystallography, particularly ... superposed by cylindrical averaging (Stubbs, 1989). The largest likely R value for noncrystalline TMV at 3Å resolution is about ...
[more results from section 19.5.7 in volume F]
Integration of continuous data
International Tables for Crystallography (2012). Vol. F, Section 19.5.6.5, p. 586 [ doi:10.1107/97809553602060000871 ]
... In diffraction from noncrystalline fibres, intensity is a function of R on each layer line. Angular deconvolution (Makowski, 1978; Namba & Stubbs ... partially oriented specimens. J. Appl. Cryst. 11, 273-283. Millane, R. P. & Arnott, S. (1986). Digital processing of X-ray ...
[more results from section 19.5.6 in volume F]
Data collection
International Tables for Crystallography (2012). Vol. F, Section 19.5.5, p. 585 [ doi:10.1107/97809553602060000871 ]
... 1998) are now generally used for final data collection (Janaswamy & Chandrasekaran, 2005, 2006; Tsuruta & Irving, 2008), taking advantage of reduced exposure ... region are collected by tilting the fibre. References Janaswamy, S. & Chandrasekaran, R. (2005). Cation induced polymorphism in iota-carrageenan. Carbohydr. ...
Fibre preparation
International Tables for Crystallography (2012). Vol. F, Section 19.5.4, p. 585 [ doi:10.1107/97809553602060000871 ]
... heating while forming polymer films (Arnott, Guss et al., 1974; Chandrasekaran, Radha, Lee & Zhang, 1994). A drop of concentrated polymer ... Conformation of keratan sulphate. J. Mol. Biol. 88, 175-184. Chandrasekaran, R., Radha, A., Lee, E. J. & Zhang, M. (1994). ...
Diffracted intensities: polycrystalline fibres
International Tables for Crystallography (2012). Vol. F, Section 19.5.3.6, pp. 584-585 [ doi:10.1107/97809553602060000871 ]
... lateral organization of the polymers, intensities are observed at discrete R values defined by the reciprocal-lattice points. In the case ... upon the unit-cell dimensions, other reflections having the same R value may also be superposed to give a single intensity, and those having R values close to each other may be difficult to ...
[more results from section 19.5.3 in volume F]
Types of fibres
International Tables for Crystallography (2012). Vol. F, Section 19.5.2, pp. 583-584 [ doi:10.1107/97809553602060000871 ]
... Soc. Symp. Ser. 141, 1-30. Stroud, W. J. & Millane, R. P. (1995). Analysis of disorder in biopolymer fibers. Acta ...
Introduction
International Tables for Crystallography (2012). Vol. F, Section 19.5.1, p. 583 [ doi:10.1107/97809553602060000871 ]
Introduction 19.5.1. Introduction Many biopolymers are long helical structures and have a natural tendency to form fibres. This tendency severely impedes the growth of single crystals from these polymers, and even if crystals can be grown, the molecular interactions in the crystals rarely correspond to the biologically significant interactions in the ...
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