Data Item _reflns.pdbx_d

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General

Item name: _reflns.pdbx_d_opt
Category name: reflns
Attribute name: pdbx_d_opt
Required in PDB entries: no
Used in current PDB entries: No

Item Description

The optical resolution of the data set, d(opt), is the expected minimum distance between two resolved peaks in an electron-density map. d(opt) = {2[sigma(Patt)2^{+ sigma(sph)2}]}1/2^{sigma(Patt) = standard deviation of the Gaussian function
fitted to the Patterson origin peak
sigma(sph) = standard deviation of the Gaussian function
fitted to the origin peak of the spherical
interference function, representing the Fourier
transform of a sphere with radius 1/dmin
dmin = nominal resolution (_reflns.d_resolution_high)

Ref: Vaguine, A. A., Richelle, J. & Wodak, S. J. (1999).
Acta Cryst. D55, 191-205.
(see also http://www.ysbl.york.ac.uk/_{alexei/sfcheck.html)
Weiss, M. S. (2001). J. Appl. Cryst. 34, 130-135.}}

Data Type

Data type code: float
Data type detail: float item types are the subset of numbers that are the floating numbers.
Primitive data type code: numb
Regular expression: -?(([0-9]+)[.]?|([0-9]*[.][0-9]+))([(][0-9]+[)])?([eE][+-]?[0-9]+)?