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Topic: Repeating unit

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Structural unit

Polymerization

Plastic

Condensation reaction

Harold Velde

	Water and oil repellent fiber comprising a physically incorporated perfluoropolyether - Patent 5576095
		The water- and oil-repellent fiber according to claim 3, wherein repeating unit (c) is present in an amount of 0.2 to 2 moles per one mole of repeating unit (a); and repeating unit (d) is present in an amount of 0.1 to 2 moles per one mole of repeating unit (a).
		The water- and oil-repellent fiber according to claim 6, wherein repeating units (e) and (a) are present in said fiber, and wherein repeating unit (e) is present in an amount of from 0.2 to 3 moles per one mole of repeating unit (a).
		The polymer contained 56.2% by mole of a repeating unit derived from the epoxide, 30.3% by mole of a repeating unit derived from succinic anhydride and 13.5% mole of a repeating unit derived from phthalic anhydride.
	www.freepatentsonline.com /5576095.html (3869 words)

	6.1 Classification of Overlayer Structures
		The highlighted unit cells of the adsorbate and substrate are identical in size, shape and orientation to those of the previously illustrated (2 x 2) structure.
		The adsorbate unit cell is again twice as large as that of the substrate in both dimensions - it retains the same aspect ratio as the rectangular substrate unit cell (1 : 1.414) and does not exhibit any rotation with respect to the substrate cell.
		Again, the adsorbate unit cell is of the same symmetry as the substrate cell but is scaled up by a factor of two in its linear dimensions (and corresponds to a surface area four times as large as that of the substrate unit cell).
	www.chem.qmul.ac.uk /surfaces/scc/scat6_1.htm (1460 words)

	Network system having external/internal audit system for computer security - Patent 5931946
		The management unit includes distribution means for distributing at least one of an external audit program and an internal audit program for defining the processing procedure, by which the repeating installation audits vulnerability of at least one of the plurality of computers, from the management unit to the repeating installations through the network.
		Then, the data repeating control unit 303 judges, on the basis of the header portion 800a of the audit response packet 902a thus received, whether or not the audit response packet 902a thus received is the audit response packet which has been addressed to the router 101a of interest.
		Then, the data repeating control unit 303 judges, on the basis of the header 800c of the audit result packet 1002a thus received, whether or not the audit result packet 1002a is the packet which is addressed to the router 101a of interest.
	www.freepatentsonline.com /5931946.html (10369 words)

	Twelve-Tone Composition
		In fact, in each repeating unit of keys there are 5 fl keys and 7 white keys.
		Note that each repeating unit is a collection of all of the pitch values commonly employed in the Western harmonic system.
		It is important to note that the particular octave from which an instance of a pitch is drawn is relevant to the sounds generated in a performance of the music, but not to the pitch order of a resultant row.
	www.geocities.com /al6an6erg/serial.html (1085 words)

	The Structure of Metals
		The result is a regular structure in which the simplest repeating unit is a cube of eight spheres, as shown in the figure below.
		Thus, the repeating unit in this structure is a cube of eight spheres with a ninth identical sphere in the center of the body
		The face-centered cubic unit cell is the simplest repeating unit in a cubic closest-packed structure.
	chemed.chem.purdue.edu /genchem/topicreview/bp/ch13/structure.php (3502 words)

	Glossary
		The atomic mass unit is defined as exactly 1/12th the mass of a carbon-12 atom, or 1.66057 x 10 -24 g.
		Typically, the y-axis is given in units of energy, and the x-axis is defined as the reaction coordinate.
		A unit cell is the smallest repeating unit of a crystalline solid which can be used to describe the entire structure.
	www.chem.wisc.edu /~newtrad/CurrRef/Glossary/Glossary.html (3551 words)

	Chapter 11, Section 7 (Site not responding. Last check: 2007-11-04)
		The repeating unit of a solid, the crystalline "brick," is known as the unit cell.
		The simplest of these is the cubic unit cell, in which all the sides are equal in length and all the angles are 90°.
		The cubic character of the unit cell is reflected in the cubic shapes of well-formed crystals of NaCl, as in Figure 11.35.
	cwx.prenhall.com /bookbind/pubbooks/blb/chapter11/medialib/blb1107.html (1869 words)

	Structural unit - Wikipedia, the free encyclopedia
		In polymer chemistry, a structural unit is a building block of a polymer chain.
		It is the result of a monomer residue which has been polymerized.
		Contrast this with repeating unit, which is the shortest sequence that can be found repeatedly in a polymer.
	en.wikipedia.org /wiki/Repeating_unit (167 words)

	Polymers
		Repeating units can also be made from two monomers.
		We notice that the repeating unit is linked to the rest of the chain by amide functional groups, and that the repeating unit contains an amide group.
		Notice that in choosing how to represent the repeating unit in step-growth polymers we have picked the particular repeating unit (out of several possibilities) which is linked to the rest of the polymer through functional group bonds.
	chemistry2.csudh.edu /rpendarvis/Polymer.html (956 words)

	Patent 6,034,220 (Site not responding. Last check: 2007-11-04)
		For the most part, the naturally occurring repeating units will be from about 4 to 8 amino acid repeating units, particularly, 4 to 6 amino acid units.
		This repeating unit is found in a naturally occurring silk fibroin protein.
		The total number of base repeating units will generally be in the range of about 50 to 300, usually 75 to 250.
	www.pharmcast.com /Patents/030100OG/6034220_polymer030700.htm (1703 words)

	polymer. The Columbia Encyclopedia, Sixth Edition. 2001-05
		The simple molecules that may become structural units are themselves called monomers; two monomers combine to form a dimer, and three monomers, a trimer.
		An addition polymer is one in which the molecular formula of the repeating structural unit is identical to that of the monomer, e.g., polyethylene and polystyrene.
		A condensation polymer is one in which the repeating structural unit contains fewer atoms than that of the monomer or monomers because of the splitting off of water or some other substance, e.g., polyesters and polycarbonates.
	www.bartleby.com /65/po/polymer.html (387 words)

	[No title]
		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 /~hameswe/MinDay4.html (750 words)

	Muse: Lively Tiles
		In this case, the repeating unit would be a block of four tiles, two red and two fl.
		If all the tiles were the same color, the repeating unit would be a single tile.
		This is because the true tile, the repeating unit that can be used to lay out the entire pattern, is not a fish.
	www.sciencenewsforkids.org /pages/puzzlezone/muse/muse0401.asp (513 words)

	Bravais Lattices (Site not responding. Last check: 2007-11-04)
		A set of possible unit vectors would point from a lattice point on one sublattice to three near neighbors on the alternate sublattice; z=8 for the bcc lattice.
		A possible unit cell can be derived from the primitive vectors as the parallelogram (2-D) or parallelpiped (3-D) whose edges coincide with the primitive vectors.
		The conventional unit cell is the same as the unit cell for sc, but for bcc contains twice the volume as the primitive unit cell, and for fcc contains four times the volume as the primitive unit cell.
	carini.physics.indiana.edu /p615/lattices.html (773 words)

	Glossary
		The smallest unit of a polymer chain with a given conformation that is repeated along that chain through symmetry operations.
		The smallest, regularly repeating material portion contained in a parallelepiped from which a crystal is formed by parallel displacements in three dimensions.
		Unlike the case of low-molar mass substances, the unit cell of polymer crystals usually comprises only parts of the polymer molecules, and the regularity of the periodic repetition may be imperfect.
	plc.cwru.edu /tutorial/enhanced/files/glossary/glossary.htm (5322 words)

	Giant Ionic Lattice
		Unit Cell is the simplest repeating unit in a crystal.
		It is repeated many trillions of times in making up a cystal.
		Notice also that there is a particle at the centre of each face of the the sodium chloride unit cell.
	www.avogadro.co.uk /structure/chemstruc/ionic/g-ionic.htm (734 words)

	Closest-Packed Structures: Hexagonal Closest-Packed Structure (Site not responding. Last check: 2007-11-04)
		In a crystal the atoms are arranged in a regular repeating pattern.
		The unit cell is characterized by three lengths and three angles.
		The quantity c is the height of the unit cell.
	www.chm.davidson.edu /ChemistryApplets/Crystals/cps_hcp.html (654 words)

	Protein crystallography lecture definitions
		the smallest unit that can be rotated and translated to generate one unit cell using only the symmetry operators allowed by the crystallographic symmetry.
		The asymmetric unit may be one molecule or one subunit of a multimeric protein, but it can also be more than one.
		Thus large unit cells result in a very closely space reciprocal lattice and small unit cells result in a reciprocal lattice with large intervals.
	adelie.biochem.queensu.ca /~rlc/work/teaching/definitions.shtml (1019 words)

	Illuminations: Creating, Describing, and Analyzing Patterns
		Creating pattern units with the interactive applet can be beneficial for students who are not yet successful in creating their own patterns with physical manipulatives.
		The interactive applet is designed so students may place entire units on the grid one at a time, or have the computer fill the entire grid.
		The "Making and Repeating Grid Patterns" activity sheet encourages students to investigate row, column and diagonal patterns generated when units of three, four, and five squares are repeated.
	illuminations.nctm.org /LessonDetail.aspx?ID=L155 (1218 words)

	Speeding up Molecular Dynamics (Site not responding. Last check: 2007-11-04)
		This box including the protein and water is then treated as one part of a repeating unit of water/protein boxes, so that the entire system is continuous; ie there is no edge to the box.
		At this point it appears as if we are setting up for a conventinal MD simulation, but unlike in conventional MD, this new volume of water occupying the previously empty grid spaces is in fact a repeating unit, and is identical for every space in the grid which remained empty after the previous step.
		This operates under precisely the same principle by which in conventional MD the water/protein box is in fact one unit of a repeating system.
	www.stanford.edu /~sykes/sb228/ass5/fastmd.html (691 words)

	Polymer Science
		The simple molecules that may become structural units in a polymer are themselves called monomers; two monomers combine to form a dimer, and three monomers, a trimer.
		A condensation polymer is one in which the repeating structural unit contains fewer atoms than that of the monomer or monomers because of the splitting off of water or some other substance, for example, polyesters and polycarbonates.
		Kuhn, Guth and Mark derive mathematical models for the theory of rubber elasticity; and Staudinger's proposal that polymers are long chains of repeating units is accepted, for which he receives the Nobel Prize in 1953.
	www.wordtrade.com /science/chemistry/polymerscience.htm (1728 words)

	Dear Students (Site not responding. Last check: 2007-11-04)
		Due to the repeating arrangement of atoms or molecules in a crystalline solid, we can describe a crystal as being made up of a structural unit that is repeated in all three axes.
		A unit cell is defined by the lengths of its edges and by the angles at the intersection of these edges.
		Furthermore, the corners of the unit cell (for ionic solids) are typically located at the center of atoms in the lattice.
	wine1.sb.fsu.edu /chm1045/notes/Forces/Solids/guide.htm (535 words)

	Polymers
		The repeating structural unit of most simple polymers not only reflects the monomer(s) from which the polymers are constructed, but also provides a concise means for drawing structures to represent these macromolecules.
		The synthesis of macromolecules composed of more than one monomeric repeating unit has been explored as a means of controlling the properties of the resulting material.
		Although polymers of this kind might be considered to be alternating copolymers, the repeating monomeric unit is usually defined as a combined moiety.
	www.cem.msu.edu /~reusch/VirtTxtJml/polymers.htm (4183 words)

	Macromolecular Nomenclature Note No. 13
		constitutional unit is an atom or group of atoms (with pendant atoms or groups, if any) comprising a part of the essential structure of a macromolecule, an oligomer molecule, a block, or a chain.
		constitutional repeating unit (CRU) is the smallest constitutional unit, the repetition of which constitutes a regular macromolecule, a regular oligomer molecule, a regular block, or a regular chain.
		junction unit is a non-repeating atom or non-repeating group of atoms between blocks in a block macromolecule.
	www.polyacs.org /nomcl/mnn13.html (1097 words)

	betachem (Site not responding. Last check: 2007-11-04)
		Figure 1 shows the structure of the basic repeating unit of glucose (4 glucose molecules shown).
		The basic repeating structure is shown in Figure 1 and is the repeating unit of the fungal extract, schizophyllan (Yanaki et al., 1983).
		The repeating unit structure was illucidated in 1971 by Kikumoto et al.
	www.transferpoint.com /html/betachem.html (886 words)

	Organization of Skin Stratum Corneum Extracellular Lamellae: Diffraction Evidence for Asymmetric Distribution of ...
		for the structure of the 130 Å repeating unit characteristic
		unit is caused by an asymmetric distribution of cholesterol
		swelling in the center of the unit cell with increasing pH (Fig.
	www.biophysj.org /cgi/content/full/85/3/1675 (4278 words)

	Math Forum - Ask Dr. Math (Site not responding. Last check: 2007-11-04)
		I was wondering how I would prove this statement: For every prime number there exists a repeated unit number that is a multiple of that prime.
		Because, believe it or not, today I did an activity with a 5th grade class that was based on your very question.
		[This is the basis of repeating decimals, repetends, and all that.] Now when you are dividing a repeating unit number, like 111..., by a prime, like 7, eventually one of the remainders will be paired with a 1 that you "bring down" (in the elementary school algorithm).
	mathforum.org /library/drmath/view/55891.html (355 words)

	Unit Planning
		Use this template to assist in the creation of a unit plan which provides very significant integration with the information age elements that we currently call educational technology, computer literacy, multimedia, hypermedia, information technology, computer integration and cyberspace.
		- indicates the content area of study, the scope of the unit and grade level range for which it is appropriate.
		Unit Objective (repeating the unit objective given in section II.
	www.ceap.wcu.edu /HOughton/EDELCompEduc/Ch2/webtemplates/UnitPlan.html (2752 words)

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