Use of the information on electron density distribution in macromolecules

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Towards automated crystallographic structure refinement with phenix.refine (2012, background): “…that data incompleteness, especially systematic incompleteness (missing planes or cones of reciprocal space), can cause mild to severe map distortions (Lunin, 1988; Urzhumtsev, Lunin & Luzyanina, 1989; Lunin & Skovoroda, 1991; Tronrud, 1996; Lunina et al., 2002; Urzhumtseva & Urzhumtsev, 2011).”
Polder maps: improving OMIT maps by excluding bulk solvent (2017, background): “Truncating the low-resolution data will degrade the quality of the map (Lunin, 1988; Urzhumtsev et al., 1989; Urzhumtseva & Urzhumtsev, 2011; Cowtan, 1996), while the Babinet bulksolvent model is only valid at resolutions below 8–10 Å (Podjarny & Urzhumtsev, 1997).”
Metrics for comparison of crystallographic maps (2014, methodology): “The reason for this is that the frequency distribution of the values of the syntheses (Lunin, 1988, 1993; Main, 1990a,b) may be different for the two syntheses.”
FEM: feature-enhanced map (2014, background): “…corresponding to unmeasured reflections Fobs in the resolution range (dmin,1) are missing from the map calculation then the map quality is degraded (Lunin, 1988; Urzhumtsev et al., 1989; Lunin & Skovoroda, 1991; Tronrud, 1996; Cowtan, 1996; Lunina et al., 2002; Urzhumtseva & Urzhumtsev, 2011).”