Data Item _refine_ls_shell.pdbx_fsc_work

General

Item name
_refine_ls_shell.pdbx_fsc_work
Category name
refine_ls_shell
Attribute name
pdbx_fsc_work
Required in PDB entries
no
Used in currrent PDB entries
No

Item Description

Fourier Shell Correlation (FSC) between model and observed structure factors for reflections included in refinement. FSC is a measure of the agreement between observed and calculated structure factors as complex numbers. (sum(|Fo| |Fc| fom cos(phic-phio))) FSCwork = -------------------------------------- (sum(|Fo|2) (sum(|Fc|2)))1/2 |Fo| = amplitude of observed structure factor |Fc| = amplitude of calculated structure factor phio = phase of observed structure factor phic = phase of calculated structure factor fom = figure of merit of the experimental phases. Summation is carried over all working reflections in the resolution shell. Ref: Rosenthal P.B., Henderson R. "Optimal determination of particle orientation, absolute hand, and contrast loss in single-particle electron cryomicroscopy. Journal of Molecular Biology. 2003;333(4):721-745, equation (A6).

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]+)?