Data Item _exptl_crystal.pdbx_mosaicity

General

Item name
_exptl_crystal.pdbx_mosaicity
Category name
exptl_crystal
Attribute name
pdbx_mosaicity
Required in PDB entries
no
Used in current PDB entries
Yes, in about 3.1 % of entries

Item Description

Isotropic approximation of the distribution of mis-orientation angles specified in degrees of all the mosaic domain blocks in the crystal, represented as a standard deviation. Here, a mosaic block is a set of contiguous unit cells assumed to be perfectly aligned. Lower mosaicity indicates better ordered crystals. See for example: Nave, C. (1998). Acta Cryst. D54, 848-853. Note that many software packages estimate the mosaic rotation distribution differently and may combine several physical properties of the experiment into a single mosaic term. This term will help fit the modeled spots to the observed spots without necessarily being directly related to the physics of the crystal itself.

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]+)?
Units
degrees

Allowed Boundary Conditions

Minimum Value Maximum Value
0

+∞