Search Results

You are looking at 1 - 10 of 5,311 items :

  • "X-ray Crystallography" x
Clear All

Direct methods and refinement in electron and X-ray crystallography – diketopiperazine revisited Douglas L. Dorset* Corporate Strategic Research, ExxonMobil Research & Engineering Co., Inc., 1545 Route 22 East, Annandale, NJ 08801 USA Received June 26, 2009; accepted November 13, 2009 Electron crystallography / X-ray crystallography / Direct methods / Refinement / Structure comparison Abstract. Texture diffraction data in pioneering Russian electron crystallographic studies inspired the invention of modern precession methods for collecting single crystal data

Zeitschrift für Kristallographie, Bd. 136, S. 81—88 (1972) X-ray crystallography of krinovite By Stefano Merlino Institute of Mineralogy and Petrography, University of Pisa* (Received 20 November 1970, and in revised form 18 October 1971) Auszug Das meteoritische Mineral Krinowit, NaMg2CrSisOio ist triklin. Seine Gitter- konstanten sind: a = 10,22, b = 10,67, c = 8,80 Â, oc = 105° 8', ß = 96° 36', y = 125° 1'. Die von Olsen und Fuchs angegebene Elementarzelle ist eine der möglichen pseudomonoklinen Zellen. Der Krinowit ist polysynthetisch ver- zwillingt mit b als

Zeitschrift für Kristallographie, Bd. 136, S. 81—88 (1972) X-ray crystallography of krinovite B y S T E F A N O M E R L I N O Institute of Mineralogy and Petrography, University of Pisa* (Received 20 November 1970, and in revised form 18 October 1971) Auszug Das meteoritische Mineral Krinowit, NaMgaCrSisOio ist triklin. Seine Gitter- konstanten sind: ο = 10,22, b = 10,67, c = 8,80 Α, α = 105° 8 ' , β = 96° 36', γ = 1 2 5 ° 1'. Die von O L S E N und F U C H S angegebene Elementarzelle ist eine der möglichen pseudomonoklinen Zellen. Der Krinowit ist

hematite. Mineral. Mag. 33, 1—8. A. R. VERMA (1951), Growth spiral on carborundum crystals. Nature [London] 1 6 8 , 4 3 0 - 4 3 1 . A. R. VERMA (1951), Growth spiral patterns on carborundum crystals. Nature [London] 168, 783-784 . A. R. VERMA (1952), Further observations of growth patterns on silicon carbide (SiC) crystal. Phil. Mag. 43, 441-446 . Β. Τ. M. WILLIS (1952), Screw dislocations in quartz. Nature [London] 170, 1 1 5 - 1 1 6 . Zeitschrift für Kristallographie, Bd. 121, S. 305 (1965) X-ray crystallography of 2-chloroquinoline B y ST E F A N O MK R L I

. Verma (1951), Growth spiral on carborundum crystals. Nature [London] 168, 430-431. A. R. Verma (1951), Growth spiral patterns on carborundum crystals. Nature [London] 168, 783-784. A. R. Verma (1952), Further observations of growth patterns on silicon carbide (SiC) crystal. Phil. Mag. 43, 441-446. B. T. M. Willis (1952), Screw dislocations in quartz. Nature [London] 170, 115-116. Zeitschrift fur Kristallographie, Bd. 121, S. 305 (1965) X-ray crystallography of 2-chloroquinoline By STEPANO MERLINO Istituto di Mineralogia doll'Universita di Pisa, Italy (Received June 6

The phase problem of X-ray crystallography H. A. Hauptman* Hauptman-Woodward Medical Research Inst., Inc., 73 High Street, Buffalo, NY 14203–1196, USA Received April 12, 2002; accepted April 13, 2002 1. Introductory comment In this essay I discuss the phase problem, often called the central problem, of X-ray Crystallography. Owing to lim- itations of space, I shall be very selective, omitting what some may regard as essential, including only that which I know best and which I regard as most important. Others may well paint a different picture. 2. Preliminary

308 Book Reviews Book Reviews An Introduction to X-Ray Crystallography. By M. M. Woolfson. Cambridge University Press, Cambridge, UK., 2nd edition, 1997, XII, 402 pages (ISBN 0-521-42359-7) £65.00. (Paperback). "Back to the roots" could be the subtitle of this book of Mi- chael Woolfson, which should be considered as a reminder in the modern trend of X-ray crystallography not to degenerate to a black-box-method being applied by everybody but being understood by nobody. The book has now been issued in a second edition, while the first edition was released in 1970

The role of crystallography has been recognized by the United Nations by declaring 2014 “Year of Crystallography” and the International Union of Crystallography ( www.iycr2014.org ), together with UNESCO, has launched an intense program of events and initiatives all over the world to promote the knowledge and image of this important science, not only within the scientific community, but also to the general public. The publication of Early Days of X-ray Crystallography comes at the most appropriate moment to give a lively historical account of crystallography

Zeitschrift für Kristallographie, Bd. 112, S. 414—426 (1959) The interpretation of the Patterson synthesis in x-ray crystallography B y C. A . BEEVERS a n d H . W . EHRLICH Chemistry Depar tment , University of Edinburgh With 9 figures (Received June 18, 1959) Auszug Zur Deutung der Pat terson-Funktionen von Kristal ls trukturen mit Molekül- git ter sollte die Gestalt der Moleküle oder ihrer Teile, wenn sie bekannt ist, immer herangezogen werden. Unte r den Patterson-Maxima komplizierter St ruk- turen, besonders in der Nähe des Zentralmaximums, gibt es

Crystal and molecular structures of three 2-sulphur-substituted cyclohexanones studied by X-ray crystallography and by ab initio molecular orbital calculations Julio Zukerman-Schpector *, I, Elisângela Vinhato II, Paulo R. Olivato *, II, Alessandro Rodrigues II, Maurizio Dal Colle III, Carlos R. Cerqueira Jr. II, Hadi D. Arman IV and Edward R. T. Tiekink *, I, IV I Universidade Federal de São Carlos, Laboratório de Cristalografia, Estereodinâmica e Modelagem Molecular, Departamento de Quı́mica, C.P. 676, São Carlos, SP, 13565-905, Brazil II Conformational