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 Results for DC.creator="R." AND DC.creator="Chandrasekaran" in section 19.5.7 of volume F
Determination of structures
Chandrasekaran, R. and Stubbs, G.  International Tables for Crystallography (2012). Vol. F, Section 19.5.7, pp. 586-588 [ doi:10.1107/97809553602060000871 ]
... a solvent-corrected atomic scattering factor (Fraser et al., 1978; Chandrasekaran & Radha, 1992) given by the function where , is the electron ... cells mediated by water molecules and cations of several polynucleotide (Chandrasekaran et al., 1995, 1997) and polysaccharide helices (Winter et al., 1975; Chandrasekaran et al., 1988, 1998; Chandrasekaran, Radha & Lee, 1994; Janaswamy & ...

Difference Fourier methods
Chandrasekaran, R. and Stubbs, G.  International Tables for Crystallography (2012). Vol. F, Section 19.5.7.6, p. 588 [ doi:10.1107/97809553602060000871 ]
... cells mediated by water molecules and cations of several polynucleotide (Chandrasekaran et al., 1995, 1997) and polysaccharide helices (Winter et al., 1975; Chandrasekaran et al., 1988, 1998; Chandrasekaran, Radha & Lee, 1994; Janaswamy & Chandrasekaran, 2001, 2002, 2008). ...

Refinement: large unit cells
Chandrasekaran, R. and Stubbs, G.  International Tables for Crystallography (2012). Vol. F, Section 19.5.7.5, pp. 587-588 [ doi:10.1107/97809553602060000871 ]
... nger, A. T., Kuriyan, J. & Karplus, M. (1987). Crystallographic R-factor refinement by molecular dynamics. Science, 235, 458-460. Hendrickson ... macromolecular structures. Methods Enzymol. 115, 252-270. Namba, K., Pattanayak, R. & Stubbs, G. (1989). Visualization of protein-nucleic acid interactions ... virus at 3.6 resolution. Acta Cryst. A41, 252-262. Nambudripad, R., Stark, W. & Makowski, L. (1991). Neutron diffraction studies ...

Initial models: large unit cells
Chandrasekaran, R. and Stubbs, G.  International Tables for Crystallography (2012). Vol. F, Section 19.5.7.4, p. 587 [ doi:10.1107/97809553602060000871 ]
... at 18 resolution. J. Mol. Biol. 194, 257-264. Franklin, R. E. & Klug, A. (1955). The splitting of layer lines ... of heavy-atom derivatives. Acta Cryst. A43, 64-69. Nambudripad, R., Stark, W. & Makowski, L. (1991). Neutron diffraction studies of ... data. Acta Cryst. A38, 417-425. Stubbs, G. J. & Diamond, R. (1975). The phase problem for cylindrically averaged diffraction ...

Data-to-parameter ratio
Chandrasekaran, R. and Stubbs, G.  International Tables for Crystallography (2012). Vol. F, Section 19.5.7.3, p. 587 [ doi:10.1107/97809553602060000871 ]
Data-to-parameter ratio 19.5.7.3. Data-to-parameter ratio The total number of data used in this refinement process is M + I + J, where M, I and J are, respectively, the number of observations in the first three terms of equation (19.5.7.1). If P is the number of parameters refined ...

Refinement: small unit cells
Chandrasekaran, R. and Stubbs, G.  International Tables for Crystallography (2012). Vol. F, Section 19.5.7.2, p. 587 [ doi:10.1107/97809553602060000871 ]
... a solvent-corrected atomic scattering factor (Fraser et al., 1978; Chandrasekaran & Radha, 1992) given by the function where , is the electron ... X-ray data and stereochemical constraints. Polymer, 7, 157-166. Chandrasekaran, R. & Radha, A. (1992). Structure of poly d(A) ...

Initial models: small unit cells
Chandrasekaran, R. and Stubbs, G.  International Tables for Crystallography (2012). Vol. F, Section 19.5.7.1, pp. 586-587 [ doi:10.1107/97809553602060000871 ]
Initial models: small unit cells 19.5.7.1. Initial models: small unit cells For many biopolymers, especially polypeptides, polynucleotides and polysaccharides, the repeating unit is a monomer or a small oligomer and the unit-cell dimensions are in the range 10 to 50. Such unit cells can accommodate one or more polymer ...

Evaluation
Chandrasekaran, R. and Stubbs, G.  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 3 resolution is about ...

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