Data Item _pdbx_refine_component.density_index

General

Item name
_pdbx_refine_component.density_index
Category name
pdbx_refine_component
Attribute name
density_index
Required in PDB entries
no
Used in currrent PDB entries
No

Item Description

The index of density is the product of the (2Fobs-Fcal) electron density values for the group of atoms divided by the average value for the structure. Low values (less than 1.0) may be problematic for model fitting. index = [(D(xi)...D(xi))(1/N)] /<D>_all Where : D(xi) = (2*Fobs - Fcal) <D>_all is the averaged value of density for the structure. The product is for N atoms of group. Ref: Vaguine, A.A., Richelle, J. & Wodak, S.J. (1999). Acta Cryst. D55,199-205

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]+)?