Journal ArticleDOI
A semi-empirical method of absorption correction
TLDR
An extension of Furnas's method is described in this paper, where the variation of intensity of an axial reflection as the crystal is rotated about the goniometer axis is used to give a curve of relative transmission T against azimuthal angle ϕ for the corresponding reciprocal lattice level.Abstract:
An extension of Furnas's method is described. The variation of intensity of an axial reflection as the crystal is rotated about the goniometer axis is used to give a curve of relative transmission T against azimuthal angle ϕ for the corresponding reciprocal lattice level. Transmission coefficients for any general reflexion hkl are then given approximately by T(hkl) = [T(ϕinc) + T(ϕret)]/2 where ϕinc and ϕret are the azimuthal angles of the incident and reflected beams. Equations are derived for (ϕinc and ϕret and the accuracy of the method is discussed.read more
Citations
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Journal ArticleDOI
Structure of S. platensis [2Fe-2S] ferredoxin and evolution of chloroplast-type ferredoxins
Keiichi Fukuyama,Toshiharu Hase,Satoshi Matsumoto,Tomitake Tsukihara,Yukiteru Katsube,Nobuo Tanaka,Masao Kakudo,Keishiro Wada,Hiroshi Matsubara +8 more
TL;DR: The three-dimensional structure of a [2Fe-2S] ferredoxin of Spirulina platensis, a blue-green alga, determined by X-ray crystallography at 2.5 Å resolution is reported and the characteristic features of the molecule are discussed in relation to the molecular evolution of ferredoxins of this class.
Journal ArticleDOI
Structure of ribonuclease A: results of joint neutron and x-ray refinement at 2.0-.ANG. resolution
TL;DR: The structure of ribonuclease A has been refined jointly with the neutron and X-ray data extending to 2.0 A, and a fourth of all amide hydrogens were found to be at least partially protected from exchange after a year of exchange with D2O.
Journal ArticleDOI
Oxidative cleavage of DNA by a dipyridoquinoxaline copper(II) complex in the presence of ascorbic acid.
Bidyut K. Santra,Pattubala A. N. Reddy,Girish Neelakanta,Subramony Mahadevan,Munirathinam Nethaji,Akhil R. Chakravarty +5 more
TL;DR: In this article, the triclinic space group P-1 with the unit cell parameters a=8.646(2) $\AA, b=12.290(5) \AA, c=14.283(4) ''AA'', α=94.69(2), β=91.60 (3)°, V=1481.7(8)''AA^3'' and Z=2.145(3)
Journal ArticleDOI
Synthesis, antimalarial activity, and molecular modeling of new pyrrolo[1,2-a]quinoxalines, bispyrrolo[1,2-a]quinoxalines, bispyrido[3,2-e]pyrrolo[1,2-a]pyrazines, and bispyrrolo[1,2-a]thieno[3,2-e]pyrazines
Jean Guillon,Philippe Grellier,Mehdi Labaied,Pascal Sonnet,Jean-Michel Léger,Rebecca Deprez-Poulain,Isabelle Forfar-Bares,Dallemagne Patrick,Nicolas Lemaître,Fabienne Péhourcq,Jacques Rochette,Christian Sergheraert,Christian Jarry +12 more
TL;DR: A possible mechanism of interaction implicating binding of pyrroloquinoxalines to beta-hematin was supported by molecular modeling and it was observed that the presence of a methoxy group on the p Pyrrolo[1,2-a]quinoxaline nucleus increased the pharmacological activity.
Journal ArticleDOI
Three-Dimensional Structure of Hemoglobin from the Polychaete Annelid, Glycera dibranchiata, at 2.5 A Resolution
Eduardo A. Padlan,Warner E. Love +1 more
TL;DR: The three-dimensional structure of hemoglobin from the bloodworm, Glycera dibranchiata, has been determined crystallographically to a resolution of 2.5 A using three isomorphous heavy atom derivatives.
References
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Book
International tables for X-ray crystallography
Norman Fordyce McKerron Henry,Lonsdale, Kathleen, Dame,John S. Kasper,Caroline H. MacGillavry,Gerard D. Rieck,James A. Ibers,Walter C. Hamilton +6 more
ReportDOI
A fortran program for calculating single crystal absorption corrections
D.J. Wehe,W.R. Busing,H.A. Levy +2 more
TL;DR: A Fortran program is described for calculating the absorption correction for application to single crystal x ray or neutron intensity measurements and is available in the form of symbolic punched cards.