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Topic: Unit cell

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	Simple Cubic Unit Cell (Site not responding. Last check: 2007-10-03)
		The simple cubic unit cell is a cube (all sides of the same length and all face perpendicular to each other) with an atom at each corner of the unit cell.
		The dimensions of the unit cell are dictated by the size of the atoms in the cell.
		The density of a solid is the mass of all the atoms in the unit cell divided by the volume of the unit cell.
	www.chm.davidson.edu /ChemistryApplets/Crystals/UnitCells/sc.html (616 words)

	Crystal structure - Wikipedia, the free encyclopedia
		A crystal structure is composed of a unit cell, a set of atoms arranged in a particular way; which is periodically repeated in three dimensions on a lattice.
		The unit cell is a spatial arrangement of atoms which is tiled in three-dimensional space to describe the crystal.
		The characteristic rotation and mirror symmetries of the group of atoms, or unit cell, is described by its crystallographic point group.
	en.wikipedia.org /wiki/Crystal_structure (1142 words)

	Unit Cells
		The body-centered cubic unit cell is the simplest repeating unit in a body-centered cubic structure.
		The face-centered cubic unit cell is the simplest repeating unit in a cubic closest-packed structure.
		Nickel crystallizes in a face-centered cubic unit cell with a cell-edge length of 0.3524 nm to calculate the radius of a nickel atom.
	chemed.chem.purdue.edu /genchem/topicreview/bp/ch13/unitcell.php (2787 words)

	Unit Cell Dimensions
		"The unit cell of a mineral is the smallest divisible unit of a mineral that possesses the symmetry and properties of the mineral.
		The atoms may be at the corners, on the edges, on the faces, or wholly enclosed in the box, and each cell in the crystal is identical.
		are the inclination angles of the axes in the unit cell.
	webmineral.com /help/CellDimensions.shtml (190 words)

	Unit Cell Dimensions
		"The unit cell of a mineral is the smallest divisible unit of a mineral that possesses the symmetry and properties of the mineral.
		The atoms may be at the corners, on the edges, on the faces, or wholly enclosed in the box, and each cell in the crystal is identical.
		are the inclination angles of the axes in the unit cell.
	www.webmineral.com /help/CellDimensions.shtml (182 words)

	Rediscovering Biology - Unit 8 Cell Biology and Cancer: Animations and Images
		A depiction of the cell cycle and role that cyclins play in the process; this animation also shows the role of checkpoints in regulating the cell cycle.
		During the M (mitosis) phase the chromosomes separate in the nucleus and the division of the cytoplasm (cytokinesis) occurs.
		Cells that are not in the process of dividing are in the G0 stage, which includes most adult cells.
	www.learner.org /channel/courses/biology/units/cancer/images.html (379 words)

	Unit Cell
		Make unit cell loads copies of the coordinates from the same source as the originally opened model (a local file or a file fetched from the web) and transforms them using the symmetry information specified by the checkbox settings.
		Cell origin coordinates are in unit cell lengths and describe translations of the unit cell along its axes, which generally differ from the axes of the viewing coordinate system.
		Unit Cell does not generate multimers defined by BIOMT records, but this can be done with Multiscale Models.
	www.cgl.ucsf.edu /chimera/1.2180/docs/ContributedSoftware/unitcell/unitcell.html (929 words)

	Curriculum Unit - Cell Structure and Processes
		The purpose of this lesson is to introduce students to Biology, the study of cells, and the light microscope.
		One idea is to use the entire classroom as the cell and hang the models of the organelles from the ceiling as a permanent 3-D display.
		The 3-dimensional nature of a cell may be more evident by using 3-dimensional models in the activity especially for kinaesthetic and visual learners.
	educ.queensu.ca /projects/science_teaching/other/cur_unit/g11bio/cells.html (3465 words)

	Diamond - Wikipedia, the free encyclopedia
		The conventional unit cell of the diamond crystal structure.
		The unit cell of diamond has a two atom basis at (0,0,0) and (1/4,1/4,1/4), which means half of the atoms are at lattice points and the other half are offset by (1/4,1/4,1/4), where 1 is the length of a side of the unit cell.
		Significant research efforts in Japan, Europe, and the United States are under way to capitalize on the potential offered by diamond's unique material properties, combined with increased quality and quantity of supply starting to become available from synthetic diamond manufacturers.
	en.wikipedia.org /wiki/Diamond (9539 words)

	Unit Cell
		The unit cell is the regular repeating pattern of particles (ions, atoms, and molecules) that pervades the crystal lattice.
		The determination of the unit cell structure of a crystalline solid is the study of the field known as Crystallography.
		The carbon atoms in diamond are arranged in a tetrahedral unit cell structure.
	members.aol.com /profchm/unitcell.html (1190 words)

	Untitled Document
		An additional chloride anion is present in the center of the cell; it contributes all of itself to the cell, i.e., ONE.
		This is exactly how Avogadro's number was first evaluated in 1912, using X-ray data to obtain volume of the unit cell, density to find the volume of one mole, and a knowledge of the contents of the unit cell to determine the net number of ions (or atoms, or molecules) present in the unit cell.
		Chloride anions are located at all corners of the unit cell, and also all face-centers; they are in contact along the face diagonal.
	www.luc.edu /faculty/spavko1/c105/disc/7-nb.htm (647 words)

	Crystal Lattice Structures (Site not responding. Last check: 2007-10-03)
		The unit cell is described by three edge lengths a = b = c = 2r (r is the host atom radius), and the angles between the edges, alpha = beta = gamma = 90 degrees.
		Unit cells in which there are host atoms (or lattice points) only at the eight corners are called primitive.
		The cell is a rhombohedron, with a = b = c = 2r, and alpha = beta = gamma = 60 degrees.
	www.chem.lsu.edu /htdocs/people/sfwatkins/ch4570/lattices/lattice.html (1147 words)

	Unit cell (Site not responding. Last check: 2007-10-03)
		The crystal system is the point group of the lattice (the set of rotation and reflection symmetries which leave a lattice point fixed),not including the positions of the atoms in the unit cell.
		The crystal structure is one of the lattices with a unit cell, which contains atoms at specific coordinates, at every latticepoint.
		Because it includes the unit cell, the symmetry of the crystal can be more complicated than the symmetry of thelattice.
	www.therfcc.org /unit-cell-109753.html (500 words)

	NationMaster - Encyclopedia: Crystal structure
		In geometry, a tiling (also called tessellation, mosaic or dissection) of a given shape S consists of a collection of other shapes which precisely cover S. Often the shape S to be tiled is the Euclidean plane, but other shapes and three-dimensional objects are considered as well.
		A Wigner-Seitz cell, in solid state physics, is a primitive lattice cell.
		In solid state physics and mineralogy, particularly in describing crystal structure, a primitive cell is a minimum volume cell corresponding to a single lattice point.
	www.nationmaster.com /encyclopedia/Crystal-structure (2531 words)

	MP Digest (Site not responding. Last check: 2007-10-03)
		As Wi is changed, either by the user or by the solver control algorithms, all of the circuit vertices associated with the length of the unit cell are symmetrically moved inward or outward in a horizontal sense.
		This unit cell lowpass filter should have a cutoff somewhere around the 1-3 GHz range, depending on the width (Wi) that is defined for the unit cell size.
		To examine the unit cell, and to obtain a set of design curves for the unit cell, an EM solver with parametric sweep analysis capability is very useful.
	www.mpdigest.com /Articles/Oct2001/Sonnett/Default.htm (1342 words)

	Ndirax: find lattice using dirax
		To transform a cell to standard setting, unit cell angles are considered identical if their difference is smaller than this number.
		Two cells are considered to have the same volume by the comparison algorithm if the relative difference of the two volumes is less than this number.
		If one of the diagonals of the unit cells has a length comparable to one of the unit cell axes, twinning can sometimes occur where this diagonal is used instead of the cell axes in the buildup of the unit cell.
	www.nonius.nl /KappaCCD/manuals/collect/utrecht/ndirax.html (1759 words)

	The Cell Division Unit (Site not responding. Last check: 2007-10-03)
		Cells are the basic unit of structure and function in all living organisms.
		All organisms are made of cells and depending upon the complexity of the organism, the number of cells can range from one single cell to as many as10 trillion cells in advanced organisms like human beings.
		Each cell in the human body, for example, contains a nucleus, and the DNA in each nucleus is the exact same from cell to cell.
	msu.edu /~vogtjeff/biology/unit_pages/unit_outline_cell_division.htm (921 words)

	The NIH Catalyst Article on the NIH Stem Cell Unit [Stem Cell Information]
		Within a year, the unit expects to produce a body of knowledge that will define and enhance the usefulness of most of the human ES cell lines that can be studied with federal funds.
		The scope of the unit's budget and research is overseen by a steering committee comprised of leading intramural and extramural stem cell biologists.
		Because the cells were extracted after the August 9, 2001, cutoff date for human ES cells that may be studied with federal funds, the Harvard group used private funds and facilities for their work—something that must also be done by any investigators seeking to use these new cell lines for their own stem cell research.
	stemcells.nih.gov /news/catalystSCU.asp (2109 words)

	Body-Centered Cubic Unit Cell (Site not responding. Last check: 2007-10-03)
		The body-centered cubic unit cell is cubic (all sides of the same length and all face perpendicular to each other) with an atom at each corner of the unit cell and an atom in the center of the unit cell.
		In the case of the body-centered cubic unit cell the atoms lying the diagonal of the cube are in contact with each other.
		Thus the diagonal of the unit cell has a length of 4r, where r is the radius of an atom.
	www.chm.davidson.edu /ChemistryApplets/Crystals/UnitCells/bcc.html (640 words)

	Introduction to Cubic Crystal Lattice Structures
		The unit cell can be thought of as a box which when stacked together in 3-dimensions produces the crystal lattice.
		The body-centered cubic structure is built up of body-centered cubic unit cell containing two atoms in each unit cell, one atom from the eight, one-eighth portions of the eight corner atoms and one from the atom located in the center of the unit cell.
		Three atoms from the six faces, one-half of each face atom is contained in a particular unit cell, and one atom from the eight, one-eighth portions of the eight corner atoms.
	www.okstate.edu /jgelder/solstate.html (538 words)

	The Living Cell - The Cell: Unit of Life - Program Guide
		The cells of plants, animals and “protists” as Leeuwenhoek’s wee beasties came to be called, all contain a nucleus.
		In the 1950s biologists knew that the cell nucleus carried some kind of chemical information that was responsible for directing cell activities and for passing the information on to the next generation.
		In the more complex cells of plants animals and protists, the DNA is surrounded by a nucleus, which has a double membrane.
	ebiomedia.com /prod/LC/LCcellunit.html (1902 words)

	[No title] (Site not responding. Last check: 2007-10-03)
		Normally, the unit cell translations are selected so that there is one unit cell for each lattice point (i.e., for an infinite lattice, the number of unit cells equals the number of lattice points).
		Unit cell translations and the axes of crystal coordinate systems are labeled a, b, and c.
		The angles between unit cell translations are identified by the Greek letter corresponding to the name of the opposite (i.e., perpendicular) translation.
	www.auburn.edu /%7Ehameswe/MinDay4.html (750 words)

	05w5073 Computational Fuel Cell Dynamics-III
		We consider the heart of the fuel cell modeling effort to be the development of an accurate computational unit cell model, capable of robustly describing the operation over a wide range of conditions.
		As of the writing of this proposal, most macroscopic unit cell models in the literature are limited to steady state operation and use fitted models of membrane, electrode and catalyst layer transport.
		The state of macroscopic unit cell models, major improvements and continued weaknesses, will be one of the main subjects of discussion outside of the scheduled lectures.
	www.pims.math.ca /birs/birspages.php?task=displayevent&event_id=05w5073 (832 words)

	Unit: Crystals
		Students will be expected to correctly name and identify all 6 unit cells from the side length and angle data they collect from the constructions.
		Students will be asked to identify a unit cell on an oral/written quiz if the teacher holds up a model or from diagrams presented on a page.
		Advanced:The student is able to accurately identify all 6 of the basic unit cell structures, siting angles and identifying the sides of the unit cells that are parallel.
	www.as.ysu.edu /~adhunter/CrystEd/UnitCell.htm (377 words)

	CAGT - Adult Stem Cell Transplant Unit
		The construction of the new 30,000 square foot state-of-the-art adult stem cell transplant unit at The Methodist Hospital was completed in October of 1999.
		The unit consists of a 15-bed inpatient unit with a contiguous outpatient unit and infusion area for providing seamless care for inpatients and outpatients.
		The Methodist Hospital is one of the largest private, nonprofit, acute-care institutions in the United States and the largest hospital in the Texas Medical Center with 1,527 licensed beds in its seven-building complex.
	www.bcm.edu /genetherapy/clinical/adultunit.html (251 words)

	Cell Reproduction Unit Plan
		It is set up similar to the units they have done in the past, including a variety of activities that they will be doing in class and on their own.
		In interphase, the cell undergoes growth, synthesis of copies of its chromosomes, and preparations for cell division.
		Cell Cycle Poster: A poster that shows the parts of the cell cycle, describes each, and tells the length of each part.
	www.msu.edu /course/te/802/science2001/804_Finn_cellreproduction.htm (1057 words)

	A Coupled Approach to Predict Microscopic Temperature Distribution Inside a Unit Cell of Nonisothermal Laminar Flow in ... (Site not responding. Last check: 2007-10-03)
		A method to compute the microscopic temperature distribution inside a unit cell for a laminar flow of an incompressible fluid in periodic porous media is presented in this paper.
		Previous approaches have only exploited the similarity of the periodic unit cells to assume the microscopic unit cell problem regardless of its comformity with the macroscopic energy balance.
		This inverse unit cell approach makes it possible to evaluate the influence of the heat capacity ratio of the fluid and the solid which was not possible to study with previous numerical unit cell approaches.
	www.begellhouse.com /journals/49dcde6d4c0809db,766f585508beaf71,57967a9c5afbcf02.html (298 words)

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