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Crystals and crystal structures
2015Abstract This first chapter considers the nature of the crystalline state by constructing crystal structures. It then moves on to look at interstitial, covalent and ionic structures, stacking faults, and twins. It also looks at the crystal chemistry of inorganic compounds, coordination polyhedra, erovskites, tetrahedral, and octahedral ...
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The Crystal Structure of Nonactin
Helvetica Chimica Acta, 1972AbstractAn X‐ray crystal structure investigation of the macrotetrolide antibiotic nonactin is reported. The shape of the molecule is discussed with special reference to the conformational changes involved in passing from free nonactin to the K+‐complex.
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1935
Crystals of potassium chloroplatinate, studied by means of spectral and Laue photographs, are shown to have the potassium chlorostannate structure with d100 = 9.73 Å and u = 0.240 = 0.005. The reported value of u = 0.16 is shown to be incorrect, and the theoretical treatment of Jones and Dent which supported this latter value is thereby deprived of its
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Crystals of potassium chloroplatinate, studied by means of spectral and Laue photographs, are shown to have the potassium chlorostannate structure with d100 = 9.73 Å and u = 0.240 = 0.005. The reported value of u = 0.16 is shown to be incorrect, and the theoretical treatment of Jones and Dent which supported this latter value is thereby deprived of its
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Crystal structure of heliorhodopsin
Nature, 2019Heliorhodopsins (HeRs) are a family of rhodopsins that was recently discovered using functional metagenomics1. They are widely present in bacteria, archaea, algae and algal viruses2,3. Although HeRs have seven predicted transmembrane helices and an all-trans retinal chromophore as in the type-1 (microbial) rhodopsin, they display less than 15% sequence
Wataru, Shihoya +23 more
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Nature, 1949
A STUDY of the crystal structure of cytidine is being carried out by X-ray analysis. The crystal specimens were kindly supplied by Dr. D. O. Jordan, University of Nottingham, and were found to be orthorhombic with {110} dominating. An optical investigation shows that the sign is positive, with α∥c, β∥b and γ∥a Cell dimensions are : a = 13·93 A., b = 14·
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A STUDY of the crystal structure of cytidine is being carried out by X-ray analysis. The crystal specimens were kindly supplied by Dr. D. O. Jordan, University of Nottingham, and were found to be orthorhombic with {110} dominating. An optical investigation shows that the sign is positive, with α∥c, β∥b and γ∥a Cell dimensions are : a = 13·93 A., b = 14·
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The crystal structure of fornacite*
Zeitschrift für Kristallographie, 1967Fornacite, Pb2(Cu,Fe)[Cr04(As,P)040H], is monoclinic, with a = 8.101 A, b = 5.893 A, c = 17.547 A, {3 = 110°00', space group P21/c. After making spherical absorption and Lorentz-polarization corrections, a three-dimensional Patterson synthesis was computed and the heaviest atoms located.
G. Cocco, L. FANFANI, P. F. ZANAZZI
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Crystal Structure of Ettringite
Nature, 1968ETTRINGITE (Ca6[Al(OH)6]2(SO4)3.26H2O) occurs as a natural mineral, and is technically important as a hydration product of Portland and supersulphated cements and in its use, as satin white, for coating paper. It forms hexagonal, prismatic crystals which in synthetic material are often highly elongated.
A. E. Moore, H. F. W. Taylor
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The crystal structure of myxin
Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry, 1968A crystal-structure analysis of the antibiotic myxin has been carried out at -160°C. The crystal is monoclinic, P21/a, with a=t5"08, b=29.36, c=4"87 A, /~=99.9 °, Z=8, formula Cx3H10N204. The structure was determined entirely by the symbolic addition method. Ultimate refinement was by block-diagonal least-squares to an R index of 0.052. Myxin was found
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