Data Item _phasing_MIR_der.R_cullis_acentric

General

Item name
_phasing_MIR_der.R_cullis_acentric
Category name
phasing_MIR_der
Attribute name
R_cullis_acentric
Required in PDB entries
no
Used in current PDB entries
Yes, in about 0.010 % of entries

Item Description

Residual factor Rcullis,acen for acentric reflections for this derivative. The Cullis R factor was originally defined only for centric reflections. It is, however, also a useful statistical measure for acentric reflections, which is how it is used in this data item. sum| |Fphobs +/- Fpobs| - Fhcalc | Rcullis,acen = ---------------------------------------- sum|Fphobs - Fpobs| Fpobs = the observed structure-factor amplitude of the native Fphobs = the observed structure-factor amplitude of the derivative Fhcalc = the calculated structure-factor amplitude from the heavy-atom model sum is taken over the specified reflections Ref: Cullis, A. F., Muirhead, H., Perutz, M. F., Rossmann, M. G. & North, A. C. T. (1961). Proc. R. Soc. London Ser. A, 265, 15-38.

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]+)?

Allowed Boundary Conditions

Minimum Value Maximum Value
0.0

+∞

Aliases

Alias Item Name Dictionary Name Dictionary Version
_phasing_MIR_der.ebi_Rcullis_acentric ebi_extensions 1.0