Croatica Chemica Acta, Vol. 72 No. 2-3, 1999.
Original scientific paper
Ab initio Direct Phasing in Macromolecular Crystallography: an Application of the Z-test
Maria Cristina Burla
; Dipartimento di Scienze della Terra, Universita’ di Perugia, I-06100 Perugia, Italy
Carmelo Giacovazzo
; Dipartimento Geomineralogico, Universita' di Bari, Via Orabona 4, I-70125 Bari, Italy
Doriano Lamba
; Ist. di Strutturistica Chimica »G. Giacomello«, Area della Ricerca di Roma – CNR, C.P.10, I-00016 Monterotondo Stazione (Roma), Italy
Giampiero Polidori
; Dipartimento di Scienze della Terra, Universita’ di Perugia, I-06100 Perugia, Italy
Giovanni Ughetto
; Ist. di Strutturistica Chimica »G. Giacomello«, Area della Ricerca di Roma – CNR, C.P.10, I-00016 Monterotondo Stazione (Roma), Italy
Abstract
The z-criterion has been recently formulated as a tool for judging about the ab initio solvability of a crystal structure via direct methods. The criterion is reconsidered to take into account the recent powerful techniques of phase refinement in direct and reciprocal space. A report is made on a medium size crystal structure, recently solved by SIR97 by the pure application of the tangent formula.
Keywords
macromolecular crystallography; phase determination
Hrčak ID:
132231
URI
Publication date:
1.9.1999.
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