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Title Twinning in protein crystals Zbigniew Dauter NCI, Macromolecular Crystallography Laboratory, Synchrotron Radiation Research Section @ ANL L_test expl NCI ...

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... that are related to one another by some geometric relation. Simple or Contact twins. e.g. the fish tail of gypsum. Penetrative. e.g. Carlsbad in Orthoclase ...

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Pseudosymmetry: good and bad news for MR ... Twinning including twinning by reticular merohedry. Pseudosymmetry 'Statistical' crystals ...

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DEFECTS IN CRYSTALS Point ... Component Thermo-mechanical Treatments Phases Defects + Casting Metal Forming Welding Powder Processing Machining Vacancies Dislocations ...

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... lattices of all twin domains superimpose exactly. ... Non-merohedral Twins ... These are non-merohedral twins, where all reflections seem to overlap because of ...

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MATERIALS SCIENCE & ENGINEERING Close Packed Crystals Part of A Learner s Guide AN INTRODUCTORY E-BOOK Anandh Subramaniam & Kantesh Balani Materials Science and ...

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... (and then try and understand its effect ... energy etc . Short range ... Faulted region Voids / Cracks Stacking faults Disclination Dispiration Thermal ...

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Scattering from imperfect crystals (see Cowley Sect. 7.1) Two types average lattice exists (point defects, dislocations, thermal vibrations) no average lattice ...

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Let Hf be the enthalpy of formation of 1 mole of vacancies. zero. For minimum. Larger contribution ... User R instead of k if Hf is in J/mole. Assuming n N. Using ...

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Polarization effects in optical spectra of photonic crystals Anton Samusev Saint Petersburg State Polytechnical University, Ioffe Physico-Technical Institute

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Cases with pseudosymmetry are more frequent in general, and dominate for pseudomerohedral twins. ... is useless for perfect twins (cannot distinguish it from ...

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Partially overlapped reciprocal lattices ... See overlap in reciprocal space. Refinement Results. Based on HKLF5 file with two matrices ...

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EHCP ~ ECCP many stacking faults. Interface interfacial energy; stacking fault has stacking fault energy (ESF). Small ESF, much ...

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Polarization effects in optical spectra of photonic crystals Anton Samusev Saint Petersburg State Polytechnical University, Ioffe Physico-Technical Institute

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Lecture 11 (10/18/2006) Crystallography Part 4: Crystal Forms Twinning Crystal Forms Unique Attributes of Crystal Forms Form Indexes defined by the Miller index (hkl ...

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ME6501 MECHANICAL BEHAVIOUR OF MATERIALS Module I (10 hours) Concepts of crystals, Plastic deformation by slip and twinning, Slip systems in FCC, BCC and HCP lattices ...

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Chemistry: KAl2(AlSi3O10)(F, OH)2, Potassium aluminum silicate hydroxide fluoride. ... Twinned crystals can form flat five pointed stars. ...

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Content of PowerPoint Introduction What is crystals? Crystals produced by crystallization Procedure of crystallization Introduction of Crystallization Crystal is a ...

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Dislocations Basic concepts edge dislocation screw dislocation Characteristics of Dislocations lattice strains Slip Systems slip in single crystals polycrystalline ...

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Physical properties of minerals and mineral identification in hand specimens. Objectives ... Twinning: calcite (CaCO3) State of Aggregate: stalagmites calcite ...

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Mechanical twinning. Twins formed in response to applied stress. ... surface imperfection, the twin plane, separates two regions of a twinned crystal. ...

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Crystallisation from melts Why do crystals form? What controls their shape and size? Three aspects to the growth of a crystal are Nucleation: formation of a stable ...

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... in the mode k2 Oxide crystals 10-17 W 10-21 m2/V2 100 GW/cm2 1 Chalcogenide glasses 10-22 W 10 -18 m2/V2 1 GW/cm2 10-6 ...

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elongated crystals flattened like a knife blade: kyanite. Dendritic. arborescent, in slender divergent branches, somewhat plantlike--native metals, pyrolusite ...

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Normally, magnifying power is the least important for astronomers. ... for 10-6m use crystals with heat sensitive electrical resistance (e.g.. germanium) ...

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Form: refers to a group of faces which have the same relation to the elements of ... Interpretation wrt petrology! Twinning. Mechanisms: 3) Deformation (secondary) ...

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... after molecular replacement or when refining against data from isomorphous crystals TLS - at medium and end stages of refinement at resolutions up to 1.7-1.6A ...

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Supergene alteration product formed by the combined effects of weathering and ... Transparency: Translucent crystals. Cleavage: Perfect in one direction ...

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DISLOCATIONS Edge dislocation Screw dislocation Burgers vectors of dislocations in cubic crystals DC type structure CsCl type structure NaCl ...

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Properties of Minerals ... crystal habit, flame test and density Uses: ore of barium Gypsum [CaSO4-2 ... bladed or blocky crystals with a slanted parallelogram outline.

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Tongues form when the cleavage crack meets a site of deformation twinning. The cleavage crack continues to form on the interface of the twin boundary, ...

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As a first approximation the. stress-displacement curve can be. written as ... b12 (b22 b32) ?. FCC. A. B. Dislocations in Ionic crystals ...

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Clays are also Sheet Silicates, just as Micas are. Vietnam Anecdote. Very small crystals ... Clay minerals all have a sheet or layered structure ...

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... to plastic flow in crystals is dominated by dislocation density. ... The macro-scale values are obtained from the microstructure in the form of volume average. ...

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In most laboratories the production of diffraction-quality crystals may be ... A heavy duty 2-axis goniometer with two 2q arm or modular 2q arm ...

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Swallowtail. Baveno. Manebach. Polysynthetic. Cyclic. Marcasite. Carlsbad Twin ... Swallowtail Twin. Two monoclinic minerals form a V-shape. Selenite. Baveno Twin ...

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First Rule of Crystallography. The Quality of the final structure is ultimately ... Corollary 1: Generally, the bigger the crystal the better the quality ...

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One of the most important aspects of the data reporting process (i.e. ... ORTEP-3 (sometimes in combination with POV-ray), SHELXP (XP), Diamond, and many others. ...

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Bowens Reaction Series

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PLATON, New Options Ton Spek, National Single Crystal Structure Facility, Utrecht, The Netherlands. Delft, Sept. 18, 2006. Overview of this Presentation PLATON ...

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Crystal Habits are typically octahedrons but rarely rhombododecahedron and other ... Associated Minerals are talc and chlorite (schists), pyrite and hematite. ...

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Title: L-5: Thermodynamics of Mixtures (Chapter 7) Author: WR Wilcox & LL Regel Last modified by: William R. Wilcox and Liya L. Regel Created Date

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... concentration, temperature, lipid composition, and water concentration affect ... some water farther into MO leads to cubic phases, while high detergent ...

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Title: Programming the Science of Crystallography Author: spek Last modified by: Anthony Spek Created Date: 8/8/2005 3:08:56 PM Document presentation format

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... by ultraviolet or X-rays Phosphorescence continuous emission of wavelengths after excitation source is removed Thermoluminescence emissions of wavelengths ...

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Macromolecular Crystallization N' Sukumar NECAT, Building 436 Argonne National Lab Argonne, Illinois

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Title: PLATON TUTORIAL Author: spek Last modified by: spek Created Date: 5/15/2003 3:07:55 PM Document presentation format: On-screen Show Company

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Starting a crystallography project (Traversing the mountain range of structure determination) crystallization structure determination protein purification

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Crystallization is a form of purification. ... ample redundancy in the data and a variation in the diffractometer angles used. ...

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The electron density ( ) at a point X, Y, Z in a unit cell of volume V is; ... we know Fhkl and (for each h, k, l) we can compute for all values of X, Y, and Z ...

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M90. M40, M41 ... M90 refinement reflection file. M50 basic crystal information, form factors, program options ... M90. M80. M81. Refinement. Contour. Fourier ...

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Slip plane is generally taken as the closest packed plane in the system ... Slip Systems ... Polycrystalline slip requires higher values of applied stresses ...

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Calculation of Kitaigorodskii Packing Index ... Note:SHELXL lacks option for fixed contribution to Structure Factor Calculation. ... Calculate difference map (FFT) ...

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Semi Public domain' (I.e. free-of-charge for academics, but with a License Fee ... DEFINE SOLVENT ACCESSIBLE VOID. STEP # 3 EXTEND INNER VOLUME WITH POINTS WITHIN ...

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Crystal plasticity ... Ball-model of a crystal. n. b. 7. Strain equations for slip. 2. 1. 3. Displacement field: ... (but small) for hexagonal crystal symmetry. ...

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