
Basic Maths for Protein Crystallographers 
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Crystallographic Equations and Some Consequences
 Crystal geometry
 Atom notation
 Lattice geometry
 Symmetry operators
 Resolution
 Form factors
 Structure factor
 Acentric reflections
 Centric reflections
 Phasing
 How does this help phasing?
 Deviation into Patterson theory
 Deviation into Difference Fourier theory
 Phasing diagrams
 SIR
 MIR
 SIRAS
 MIRAS
 SAD
 Intensity statistics
 Wilson Plot
 Normalisation
 Cumulative intensity distribution
 Moments
Authors
Eleanor Dodson, University of York, England
Produced by Maria Turkenburg, University of York, England.