Access the full text.
Sign up today, get DeepDyve free for 14 days.
H. Hauptman (1974)
On the identity and estimation of those cosine invariants, cos(φl + φm + φn + φp), which are probably negativeActa Crystallographica Section A, 30
H. Hauptman (1982)
On integrating the techniques of direct methods and isomorphous replacement. I. The theoretical basisActa Crystallographica Section A, 38
H. Schenk (1973)
The use of phase relationships between quartets of reflexionsActa Crystallographica Section A, 29
C. Giacovazzo, G. Cascarano, Z. Chao-de (1988)
On integrating the techniques of direct methods and isomorphous replacement. A new probabilistic formula for triplet invariantsActa Crystallographica Section A, 44
G. Titta, J. Edmonds, D. Langs, H. Hauptman (1975)
Use of negative quartet cosine invariants as a phasing figure of merit: NQESTActa Crystallographica Section A, 31
C. Kyriakidis, R. Peschar, H. Schenk (1996)
The estimation of four-phase structure invariants using the single difference of isomorphous structure factorsActa Crystallographica Section A, 52
C. Giacovazzo, D. Siliqi (1996)
On Integrating Direct Methods and Isomorphous Replacement Techniques. II. The Quartet Invariant EstimateActa Crystallographica Section A, 52
N. Hu, Yong-Sheng Liu (1997)
General expression for probabilistic estimation of multiphase structure invariants in the case of a native protein and multiple derivatives. Application to estimates of the three-phase structure invariantsActa Crystallographica Section A, 53
C. Giacovazzo, D. Siliqi, R. Spagna (1994)
The ab initio crystal structure solution of proteins by direct methods. II. The procedure and its first applications.Acta crystallographica. Section A, Foundations of crystallography, 50 ( Pt 5)
H. Hauptman, S. Potter, C. Weeks (1982)
On integrating the techniques of direct methods and isomorphous replacement. II. The first applicationsActa Crystallographica Section A, 38
S. Fortier, N. Moore, M. Fraser (1985)
A direct‐methods solution to the phase problem in the single isomorphous replacement case: theoretical basis and initial applicationsActa Crystallographica Section A, 41
C. Giacovazzo, D. Siliqi (1996)
On Integrating Direct Methods and Isomorphous Replacement Techniques. I. A Distribution Function for Quartet InvariantsActa Crystallographica Section A, 52
R. Timkovich, R. Dickerson (1976)
The structure of Paracoccus denitrificans cytochrome c550.The Journal of biological chemistry, 251 13
C. Giacovazzo (1975)
A probabilistic theory in P of the invariant EhEkElEh+k+1Acta Crystallographica Section A, 31
The probability distribution of the four‐phase structure invariants (4PSIs) involving four pairs of structure factors is derived by integrating the direct methods with isomorphous replacement (IR). A simple expression of the reliability parameter for 16 types of invariant is given in the case of a native protein and a heavy‐atom derivative. Test calculations on a protein and its heavy‐atom derivative using experimental diffraction data show that the reliability for 4PSI estimates is comparable with that for the three‐phase structure invariants (3PSIs), and that a large‐modulus invariants method can be used to improve the accuracy.
Acta Crystallographica Section A Foundations of Crystallography – Wiley
Published: Jan 1, 1999
Read and print from thousands of top scholarly journals.
Already have an account? Log in
Bookmark this article. You can see your Bookmarks on your DeepDyve Library.
To save an article, log in first, or sign up for a DeepDyve account if you don’t already have one.
Copy and paste the desired citation format or use the link below to download a file formatted for EndNote
Access the full text.
Sign up today, get DeepDyve free for 14 days.
All DeepDyve websites use cookies to improve your online experience. They were placed on your computer when you launched this website. You can change your cookie settings through your browser.