In mineralogy and crystallography , crystalstructure is a unique arrangement of atom s or molecule s in a crystal line liquid or solid . A crystalstructure is composed of a pattern, a set of atoms arranged ... are embodied in its space group . A crystal s structure and symmetry play a role in determining many of its physical properties, such as cleavage crystal cleavage , electronic band structure , and crystal ... The crystalstructure of a material or the arrangement of atoms within a given type of crystalstructure ... space describe the bulk arrangement of atoms of the crystal. The crystalstructure has a three ... ... ABABABAB .... center This type of crystalstructure is known as hexagonal close packing hcp ... arises center ... ABCABCABC ... center This type of crystalstructure is known as cubic close packing ... lattices . The crystalstructure consists of the same group of atoms, the basis , positioned around ... of the crystalstructure unchanged. These symmetry operations include Reflection , which reflects the structure ... of the crystalstructure is composed of the translational symmetry operations in addition to the operations ... micrograph of surface of a colloidal crystal . Structure and morphology consists of ordered crystallite ... relationship. Since grain boundaries are defects in the crystalstructure they tend to decrease ... allow Shear stress shear at lower stress than that needed for a perfect crystalstructure. ref cite ... Press location Long Grove, IL isbn 1 57766 425 6 pages 85 ref Prediction of structure Main Crystalstructure prediction File Sodium chloride 3D ionic.png thumb Crystalstructure of sodium chloride table ... and crystalstructure in beta phase alloys, Hume Rothery analyzed the trends in melting points, compressibilities ... structures respectively. The relationship between d electrons and crystalstructure thus becomes apparent ... form, which has a diamond cubic crystalstructure, similar to diamond , silicon or germanium . Gray ... is due to the crystalstructure not the presence of a ferrous metal . See also For more detailed information ... more details
For the mineral, see Wurtzite Image Wurtzite kassebaum.gif thumb right 150px Wurtzite structure Image Wurtzite unit cell 3D balls.png thumb right 150px Wurtzite unit cell Image Wurtzite polyhedra.png thumb 150px right Wurtzite structure image Hexagonal lattice.svg thumb 150px right General hexagonal crystalstructure The wurtzite crystalstructure , named after the mineral wurtzite , is a crystalstructure for various binary compound s. It is an example of a hexagonal crystal system . Among the compounds that can take the wurtzite structure are wurtzite itself, Silver iodide AgI , Zinc oxide ZnO , Cadmium sulfide CdS , Cadmium selenide CdSe , Silicon carbide SiC , Gallium III nitride GaN , Aluminium nitride AlN , and other semiconductors. In most of these compounds, wurtzite is not the favored form of the bulk crystal, but the structure can be favored in some nanocrystal forms of the material. In materials with more than one crystalstructure, the prefix w is sometimes added to the empirical formula to denote the wurtzite crystalstructure, as in w BN . Each of the two individual atom types forms a sublattice which is close packing HCP type short for hexagonal close pack . When viewed altogether, the atomic positions are the same as in lonsdaleite hexagonal diamond . Each atom is tetrahedrally coordinated. The wurtzite structure is centrosymmetry non centrosymmetric i.e., lacks inversion symmetry . Due to this, wurtzite crystals can and generally do have properties such as piezoelectricity and pyroelectricity , which centrosymmetric crystals lack. External links http cst www.nrl.navy.mil lattice struk b4.html The Wurtzite structure Category Crystallography fa ... more details
Crystalstructure prediction CSP is the calculation of the crystalstructure s of solids from first principles. Reliable methods of predicting the crystalstructure of a compound, based only on its molecular structure, has been a goal of the physical sciences since the 1950s. ref name cryptic cite journal journal Nature Materials volume 1 pages 77 79 year 2002 doi 10.1038 nmat726 title Cryptic crystallography ... Nature Materials volume 7 pages 937 946 year 2008 doi 10.1038 nmat2321 title Crystalstructure ... cite journal journal Nature Materials volume 5 year 2006 pages 623 626 title Crystalstructure ... J. Chem. Phys. volume 124 pmid 244704 issue 10 pages 8 13 year 2006 title Crystalstructure prediction ... year 2008 title A Major Advance in CrystalStructure Prediction author M. A. Neumann, F. J. J. Leusen ... of CrystalStructure Prediction editor A. R. Oganov location Berlin publisher Wiley VCH ISBN ... COI date March 2011 The crystal structures of simple ionic solids have long been rationalised in terms ... author Linus Pauling L. Pauling year 1929 title The principles determining the structure of complex .... However, prediction and rationalization are rather different things. Most commonly, by crystalstructure prediction one understands search for minimum energy arrangement of the atoms or, for molecular ... Letters volume 90 pmid 75502 issue 3 pages 341 53 year 2003 title Predicting crystal structures The Parrinello ... crystals The crystal structures of molecular substances, particularly organic compounds, are very .... ref name cryptic Predicting organic crystal structures is important to academic and industrial science ... structure of crystals author K. Sanderson pmid 18063962 volume 450 ref ref name 4th blind test cite ... Pt 2 year 2009 pages 107 125 title Significant progress in predicting the crystal structures of small ... of all possible crystal structures using a customised molecular mechanics MM force field, and finishes ... energy and stability of each short listed candidate structure. ref name Neumann cite journal journal ... more details
crystal system tetragonal slightly distorted fcc structure ref name Greenwood Tin Sn tetragonal 4 at 302pm 2 at 318pm 4 at 377 8 at 441pm ref name Greenwood Antimony Sb Rhombohedral crystal system ... reach a maximum at around group 6 and then fall with increasing atomic number. See also Crystalstructure ... ref , the only exception is mercury element mercury , Hg, which is a liquid and the structure refers ... symbol. Most of metallic elements are variations of the cubic crystal system , with the exceptions ... structure style border 1px solid aaaaaa width 100pt background color palegreen unknown uncertain style ... class wikitable Metal structure family coordination number notes manganese Mn cubic distorted bcc unit cell contains Mn atoms in 4 different environments ref name Greenwood Zinc Zn Hexagonal crystal ... approx. 10 further away ref name Greenwood Gallium Ga Orthorhombic crystal system orthorhombic each Ga atom has one nearest neighbor at 244pm, 2 at 270pm, 2 at 273, 2 at 279pm. ref name Greenwood The structure ... neighbours this structure can be considered to be a distorted hcp lattice with the nearest neghbours ... structure ABAC... ref name Wells A.F Wells 1962 Structural Inorganic Chemistry 3d Edition Oxford University Press ref Praseodymium Pr hexagonal 12 nearest neighbours double hcp with a layer structure ... structure ABAC... ref name Wells samarium Sm hexagonal 12 nearest neighbours complex hcp with 9 layer ... hume rothery ref plutonium Pu Monoclinic crystal system monoclinic Usual crystal structures Close packed ... In the ideal hcp structure the unit cell axial ratio is 1.633, However there are deviations from this in some metals where the unit cell is distorted in one direction but the structure still retains the hcp space group. In others e.g. zinc the deviations from the ideal change the symmetry of the structure ... structure and implications for glide slide e.g. ductility. Body centred cubic This is NOT a close packed structure. In this each metal atom is at the centre of a cube with 8 nearest neighbors, however ... more details
ICSD is a database of inorganic crystalstructure data. It was founded in 1978 by G nter Bergerhoff University of Bonn and I.D.Brown University of McMaster, Canada . It is now produced by the Fachinformationszentrum Karlsruhe in Europe and the U.S. National Institute of Standards and Technology . It seeks to contain information on all inorganic crystal structures published since 1913, including pure chemical element element s, mineral s, metal s, and intermetallic compounds with atomic coordinates . ICSD contains 103,679 entries As of 2008 alt as of mid 2008 and is updated twice a year. A Microsoft Windows Windows based Personal Computer PC version has been developed in co operation with the National Institute of Standards and Technology NIST , and a PHP MySQL web based version in co operation with the Institut Laue Langevin ILL Grenoble. See also Crystallographic database External links http www.fiz karlsruhe.de icsd.html Information and a demonstration version Category Inorganic chemistry Category Chemical databases Category Crystallographic databases chem stub fr Inorganic crystalstructure database ... more details
with boron . Their crystalstructure and chemical bonding depend strongly on the metal element M and on its ... the latter originates from their complex, amorphous like , crystalstructure. Metal borides ... in a Hexagonal crystal system hexagonal AlB sub 2 sub type layered structure. Hexaborides ... the YAlB sub 14 sub crystalstructure using a single crystal grown by the high temperature solution ... nm, and the atomic coordinates and site occupancies are summarized in Crystalstructure of boron rich .... Vacancies at the Y and Al sites are ignored. ref name korsukova2 Figure 3 shows the crystalstructure ... in Crystalstructure of boron rich metal borides data page Table I table I . If both metal elements ... They reported that YB sub 66 sub has a Cubic crystal system face centered cubic structure with space ... Atomic coordinates and site occupancies are summarized in Crystalstructure of boron rich metal borides ... and single crystalstructure analysis. ref name higashiyb50 The structure analysis indicated ... crystalstructure space group Pbam , No. 55 with lattice constants of a 1.674 1 nm, b 1.7667 1 nm ... coordinates and site occupancies are summarized in Crystalstructure of boron rich metal borides data ..., i.e. have a similar crystalstructure, to boron carbide B sub 4 sub C . The latter has a structure ... compounds. ref name jasper1 Single crystalstructure analysis yielded trigonal symmetry for ScB sub ... coordinates are summarized in Crystalstructure of boron rich metal borides data page Table IVa ... The crystalstructure, solved for a representative compound YB sub 22 sub C sub 2 sub N, belongs ... 2 sub N are summarized in Crystalstructure of boron rich metal borides data page Table IVb table IVb . Y, Ho, Er, Tm and Lu also form REB sub 28.5 sub C sub 4 sub which has a trigonal crystalstructure ... formula units in the unit cell. Structure data of YB sub 28.5 sub C sub 4 sub are summarized in Crystal ... sub C sub 0.33 sub Si sub 3.0 sub File Borfig14.png thumb 240px Fig. 14 . Crystalstructure of RE sub ... more details
TOC right This page contains crystalstructure data used in the article crystalstructure of boron rich metal borides . Table I class wikitable Structure data for YAlB sub 14 sub ref name korsukova Atom Site x y z Occ. b sub iso sub sup 2 sup Y 8 i 0.02511 8 1 4 0.64217 3 0.310 1 Anisotropic Al 4 c ... K, Ishizawa Y and Takami M year 1997 title CrystalStructure of YB41Si1.2 journal J. Solid State ... A A and Nyan K K year 1989 title CrystalStructure, Electrical, and Magnetic Properties of the New ... and nitrogen stabilized polyborides REB15.5CN RE Sc, Y, Ho, Er, Tm, Lu , crystalstructure and compound ... T, Liu Q L, Sato A and Tanaka T year 2001 title Crystalstructure of new rare earth boron rich solids ... II class wikitable Structure data for YB sub 62 sub ref name tanakayb66 Atom Site x y z Occ. U sub ... 11 0.25 0.25 0.110 12 0.0414 43 Table III class wikitable Structure data for YB sub 41 sub Si sub ... 2 sup sub 11 sub b sup 2 sup sub 22 sub c sup 2 sup sub 33 sub . Table IVa Structure data for homologous compounds. class wikitable a . Structure data of ScB sub 15.5 sub CN ref name jasper1 Atom ... values was fixed at 1.0. Table IVb class wikitable b . Structure data of YB sub 22 sub C sub 2 sub ... 0.99 6 3.19 0 N 6 c 0 0 0.401 3 0.84 0 0.95 8 Table IVc class wikitable c . Structure data of YB sub ... Structure data for Y sub x sub B sub 12 sub C sub 0.33 sub Si sub 3.0 sub x 0.68 ref name tanakaREBSi3 ... 3 Si3 C3 0.413 C3 Si3 1.786 24 Si3 Si3 1.373 10 Table VI class wikitable Structure data for ScB sub ... by structure analysis. Table VII class wikitable Structure data for ScB sub 17 sub C sub 0.25 sub ... 24 0.0 0.53 45 8 B18 6 m 0.0379 10 0.0758 10 1 2 0.67 44 6 Table VIII class wikitable Structure .... Table IX class wikitable Structure data for Sc sub 4.5 x sub B sub 57 y z sub C sub 3.5 ... wikitable Structure data for Sc sub 3.67 x sub B sub 41.4 y z sub C sub 0.67 z sub Si sub 0.33 .... Ser. title Structure refinement of quaternary RE B C Si compounds Y3 x B12 3 CSi Si8 x 0.96 and Dy3 ... more details
structure The program is built of two modules crystal and properties . The crystal program is dedicated ..., Lecture Notes in Chemistry, Vol. 67, Spinger Verlag, Heidelberg, 1996 See also Crystalstructure List ...Other uses Crystal disambiguation Multiple issues orphan January 2011 cleanup January 2009 rewrite January 2009 CRYSTAL is a quantum chemistry Ab initio quantum chemistry methods ab initio program, designed primarily for calculations on crystals 3 dimensions , slabs 2 dimensions and polymers 1 dimension using translational symmetry, but it can also be used for single molecules. ref Computational Chemistry , David Young, Wiley Interscience, 2001. Appendix A. A.2.2 pg 334, Crystal ref It is written by V.R. Saunders, R. Dovesi, C. Roetti, R. Orlando, C.M. Zicovich Wilson, N.M. Harrison, K. Doll, B. Civalleri, I.J. Bush, Ph. D Arco, and M. Llunell from Theoretical Chemistry Group at the University of Torino and the Computational Materials Science Group at the Daresbury Laboratory near Warrington ... cluster from a perfect crystal H saturated 3D to 0D extraction of molecules from a molecular crystal ..., deletion of atoms Wave function analysis and properties Electronic band structure Band structure Density ... Electric field gradient Structure factor s Compton profiles Electron Momentum Density Electrostatic ... crystal writes information on the crystalline system and its wave function as unformatted sequential ... advantage of the crystal code is due to the deep and optimized exploitation of symmetry, at all ... optimisation of periodic systems with the CRYSTAL code. Chem. Phys. Lett. 348, 131 138 2001 Localized ... compounds. and its implementation in the CRYSTAL code J. Comput. Chem. 25, 888 897 2004 . C.M. Zicovich ... field perturbation method in the CRYSTAL program for calculating the dielectric constant ... External links http www.crystal.unito.it CRYSTAL http www.cse.clrc.ac.uk cmg index.shtml Computational ... of Torino DEFAULTSORT Crystal Category Computational chemistry software it CRYSTAL ru CRYSTAL ... more details
wiktionary structure The structure of a thing is how the parts of it relate to each other, how it is assembled . Structure may also refer to Architectural structure , a man made structure used or intended for supporting or sheltering any use or continuous occupancy Building , Non building structure & Building disambiguation Canopy ecology structure, organization or three dimensional geometry of a plant canopy Community ecology structure, ecological organization of a biological community Chemical structure , the spatial arrangement of atoms and bonds in a molecule Protein structureCrystalstructure , structure of liquids and glasses , the spatial arrangement of ions, atoms, or molecules in condensed matter Data structure , a way of storing data in a computer so that it can be used efficiently Mathematical structure on a set, additional mathematical objects that in some manner attach to the set, making it easier to visualize or work with, or endowing the collection with meaning or significance Structure mathematical logic Algebraic structure Social structure , a pattern of relations Structure and agency , two confronted theories about human behaviour Structural geology , the three dimensional ... Deep structure logical language structure in linguistics The Structure of Scientific Revolutions , a book by Thomas Kuhn on the history of science Structure clothing store , a men s clothing store operated by Limited Brands until 2000, when it merged with Structure s women s clothing store Express company Express to become ExpressMen . The brand name Structure was later sold to Sears, Roebuck and Company Sears in 2003, branding used for men s and young men s apparel and accessories . Structure journal , a scientific journal describing protein structure s. Large scale structure of the cosmos Financial structure, a concept within Structured finance . disambig ar br Framm da Struktur flertydig fr Structure gl Estrutura it Struttura hu Strukt ra egy rtelm s t lap ja pl Struktura ... more details
A chemical structure includes molecular geometry , electronic structure and crystalstructure of molecule s. Molecular geometry refers to the spatial arrangement of atom s in a molecule and the chemical bond s that hold the atoms together. Molecular geometry can range from the very simple, such as diatomic oxygen or nitrogen molecules, to the very complex, such as protein or DNA molecules. Molecular geometry can be roughly represented using a structural formula . Electronic structure describes the occupation of a molecule s molecular orbital s. Structure determination Structural determination in chemistry is the process of determining the chemical structure of molecules. Practically, the end result of such process is the obtainment of the coordinates of the atoms in a molecule. ref name lecture07uwec http www.chem.uwec.edu Chem406 F06 Pages lecture notes lect07 C406 lect07 notes.pdf C406 lect07 Bot generated title PDF, 936 KiB ref The methods by which one can determine the structure of a molecule include spectroscopy , such as nuclear magnetic resonance NMR , infrared spectroscopy and Raman spectroscopy , electron microscopy , and x ray crystallography x ray diffraction . The last technique can produce three dimensional models at atomic scale optical resolution resolution , as long as crystal s are available, as x ray diffraction needs numerous copies of the molecule being studied that must also be arranged in an organised way. ref name lecture07uwec The following are common methods for determining the chemical structure Structural elucidation X ray diffraction Proton NMR Carbon 13 NMR Mass spectrometry Infrared spectroscopy The following are common methods for determining the electronic structure Electron spin resonance Cyclic voltammetry Electron absorption spectroscopy ... molecular properties of drugs QSAR , quantitative structure affinity relationship Chemical property ... es Estructura qu mica fr Structure chimique ja nl Chemische structuur nds Cheemsch Struktur pt ... more details
with a triangular surface symmetry. Diamond CrystalStructure The Diamond cubic crystalstructure occurs ...In condensed matter physics and crystallography , the static structure factor or structure factor for short is a mathematical description of how a material scatters incident radiation. The structure factor .... The static structure factor is measured without resolving the energy of scattered photons electrons neutrons. Energy resolved measurements yield the dynamic structure factor . Scattering from a crystal A crystal is a periodic arrangement of atoms in a particular pattern. Each of the atoms may ... by the crystal. In the kinematical approximation for diffraction, the intensity of a diffracted beam ... mathbf k math , and math F Delta mathbf k math is the so called structure factor which is given ... k math is equal to a reciprocal lattice vector math mathbf K math . The structure factor describes the way in which an incident beam is scattered by the atoms of a crystal unit cell, taking into account ... X rays, the atomic form factors for the two cases are not the same. Structure factors for specific lattice types To compute structure factors for a specific lattice, compute the sum above over the atoms ... , it is useful to examine a specific structure factor in terms of these. Body centered cubic BCC As a convention ... simple cubic with side math 2 pi a math . In a monoatomic crystal, all the form factors math f ... hat x k hat y l hat z math by a crystal plane with Miller indices math hkl math is then given by math ... & & f left 1 1 h k l right end matrix math We then arrive at the following result for the structure ... involving a body centered crystal, the sum of the Miller indices of the scattering plane must ... to higher Miller indices, the most intense diffraction peak from a material with a BCC structure is typically the 110 . The 110 plane is the most densely packed of BCC crystal structures and is therefore ... FCC crystal, the atoms in the basis are at the origin math mathbf r 0 vec 0 math with indices ... more details
is the undistorted cubic crystal system cubic structure the symmetry is lowered to orthorhombic , tetragonal or trigonal in many perovskites. ref cite journal title Energetics and Crystal Chemical ...Image Perovskite.jpg thumb Structure of a perovskite with a chemical formula ABX sub 3 sub . The red spheres are X atoms usually oxygens , the blue spheres are B atoms a smaller metal cation, such as Ti ... Chem. Mater. year 1998 volume 10 issue 10 page 2787 doi 10.1021 cm9801901 ref A perovskite structure is any material with the same type of crystalstructure as calcium titanium oxide CaTiO sub 3 sub , known as the perovskite structure , or sup XII sup A sup 2 sup sup VI sup B sup 4 sup X sup 2 sup sub 3 sub with the oxygen in the cubic crystal system face centers . ref name Min cite book title ... atoms. The ideal cubic symmetry structure has the B cation in 6 fold coordination, surrounded by an octahedron ... ion size requirements for stability of the cubic structure are quite stringent, so slight buckling ... numbers of A cations, B cations or both are reduced. Natural compounds with this structure are perovskite , loparite , and silicate perovskite. ref name Min Structure The perovskite structure is adopted ... . The relative ion size requirements for stability of the cubic structure are quite stringent, so slight ..., the O sup 2 sup ions compress so olivine transforms to the spinel structure, which at still higher pressure converts to a perovskite structure and a coexisting periclase structure. ref name ... has the orthorhombically distorted perovskite structure GdFeO sub 3 sub type structure that is stable ... lattice struk e2 1.html Cubic Perovskite Structure , including a http cst www.nrl.navy.mil lattice struk.jmol e2 1.html Java applet where the structure can be interactively rotated http wikis.lib.ncsu.edu index.php Perovskite perovskites at NCSU DEFAULTSORT Perovskite Structure Category Mineralogy ... fr P rovskite structure it Perovskite nl Perovskiet ja pl Perowskit pt Perovskita ro ... more details
A complex structure may refer to Almost complex manifold Complex manifold Linear complex structure See also Real structure disambig Category Linear algebra ... more details
In mathematics , structure can refer to Mathematical structure &ndash extra objects attached to a set that endow it with extra meaning or significance. A structure mathematical logic structure in mathematical logic , sometimes called a model, gives a concrete interpretation of a formal language. disambig ... more details
Cell structure may refer to An organelle , or the layout of organelles of the biological cell itself The structure of a covert cell , often involved in underground resistance, organised crime, terrorism or any group requiring stealth in its operations In mathematics, the structure of a cell complex disambig ... more details
Organic structure may refer to Organic model , forms, methods and patterns found in living systems, often used as a metaphor for non living things The Organic chemistry Molecular structure of an organic compound molecular structure of an organic compound , also known as the structural formula of an organic compound See also Organic disambiguation disambig ... more details
layers. Structure Image RadialDensityPREM.jpg thumb 300px right Earth s radial density distribution ... using constant and linear density for Earth s interior. The structure of Earth can ... . Some have argued that the inner core may be in the form of a single iron crystal . ref cite web ... title Crystal at the Center of the Earth accessdate 2007 02 05 ref ref http www.sciencemag.org .... Int. 14, 3 31 Schneider, David October 1996 A Spinning Crystal Ball , Scientific American Wegener ... Structure Of The Earth Category Structure of the Earth bg ca Estructura ... egitura fr Structure interne de la Terre hr Struktura Zemlje it Struttura interna della Terra sw Muundo ... P m ntului sq Nd rtimi i brendsh m i Tok s simple Structure of the Earth sk Stavba Zeme sl ... more details
unreferenced date June 2009 bot yes An abstract structure is a formal object that is defined by a set of laws, properties, and relationships in a way that is logically if not always historically independent of the structure of contingent experiences, for example, those involving physical objects. Abstract structures are studied not only in logic and mathematics but in the fields that apply them, as computer science , and in the studies that reflect on them, as philosophy and especially the philosophy of mathematics . Indeed, modern mathematics has been defined in a very general sense as the study of abstract structures by the Nicolas Bourbaki Bourbaki group see discussion there, at algebraic structure and also structure category theory structure . An abstract structure may be represented perhaps with some degree of approximation by one or more physical objects this is called an implementation or instantiation of the abstract structure. But the abstract structure itself is defined in a way that is not dependent on the properties of any particular implementation. An abstract structure has a richer structure than a concept or an idea . An abstract structure must include precise rules of behaviour which can be used to determine whether a candidate implementation actually matches the abstract structure in question. Thus we may debate how well a particular government fits the concept ... game of chess. Examples A sorting algorithm is an abstract structure, but a recipe is not, because ... structure, but an orchestration is not, because it depends on the properties of particular instruments. Euclidean geometry is an abstract structure, but the theory of continental drift is not, because it depends on the geology of the Earth . A formal language is an abstract structure, but a natural ... s Mathematical structure math stub Category Abstraction Category Mathematical terminology Category Structure lt Abstrakti strukt ra th tr Soyut yap ... more details
Structure theorem may refer to Structured program theorem , a result in programming language theory Structure theorem for finitely generated modules over a principal ideal domain , a result in abstract algebra a subject area in mathematics disambig ... more details
wiktionary TOCright Power Structure may refer to Hierarchy , more specifically the Power network . The Establishment disamb fi Valtarakenne ... more details
italictitle Infobox journal title Structure cover editor Christopher D. Lima and Andrej Sali discipline Protein structure abbreviation Structure publisher Cell Press country United States frequency 12 year history 1993 present openaccess license impact impact year website http www.cell.com structure home link1 http www.cell.com structure archive link1 name Archives link2 link2 name RSS atom JSTOR OCLC 28867361 LCCN CODEN ISSN 0969 2126 eISSN boxwidth Structure is a peer review ed scientific journal founded by Wayne A. Hendrickson , Carl Ivar Br nd n and Alan R. Fersht in September 1993. It focuses on protein structure and related issues. The journal is published monthly by Cell Press . The current editors are Christopher D. Lima and Andrej Sali . Reed Elsevier journal stub Category Biochemistry journals Category Cell Press academic journals Category Publications established in 1993 ... more details
In mathematics , for a Formal language language math mathcal L math , define the Herbrand universe to be the set of ground term s of math mathcal L math . A Structure mathematical logic structure math mathfrak M math for math mathcal L math is an Herbrand structure if the Domain of discourse domain of math mathfrak M math is the Herbrand universe of math mathcal L . math This fixes the domain of math mathfrak M math , and so each Herbrand structure can be identified with its interpretation, leading to the alternative nomenclature of Herbrand interpretation . A Herbrand model of a axiomatic set theory theory math T math is a Herbrand structure which is a model of math T. math See also Herbrand base Herbrand s theorem planetmath id 6105 title Herbrand structure Category Mathematical logic de Herbrand Struktur mathlogic stub ... more details
Hyperbolic structure may refer to Hyperboloid structure Hyperbolic set mathdab Short pages monitor This long comment was added to the page to prevent it being listed on Special Shortpages. It and the accompanying monitoring template were generated via Template Longcomment. Please do not remove the monitor template without removing the comment as well. ... more details
The structure space of a commutative Banach algebra is an analog of the spectrum of a C algebra . It consists of all multiplicative linear functional s on the algebra. The Gelfand representation of the Banach algebra is a map taking the Banach algebra elements to continuous function s on the structure space. Category Banach algebras Mathanalysis stub ... more details
Population structure may refer to many aspects of population ecology Population stratification Population pyramid Age class structure F statistics Population density Population distribution Population dynamics and population growth Population genetics Population size disambig ... more details
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