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Дисертації з теми "Molecular weight"

Автор: Grafiati

Опубліковано: 4 червня 2021

Оновлено: 25 липня 2025

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1

Wright, Patricia Ann. "Understanding MS/MS fragmentation pathways of small molecular weight molecules." Thesis, University of Greenwich, 2015. http://gala.gre.ac.uk/18134/.

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Fragmentation of molecules by collision-induced dissociation (CID) is not well-understood, making interpretation of MS/MS spectra difficult and limiting the effectiveness of software tools intended to aid mass spectral interpretation. An approach is required which is tailored to each individual molecule and improves the ‘chemical sense’ of the software. It was hypothesised that the bonds which break during CID of protonated molecules are the bonds which are elongated, and hence weakened, as a result of conformational changes induced by protonation. Bond length changes for a test set of molecul

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2

Nightingale, Philip D. "Low molecular weight halocarbons in seawater." Thesis, University of East Anglia, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280971.

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3

Waters, Benjamin Ragan. "Molecular weight modulation in polyhydroxybutyrate fermentations." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/38974.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, June 2007.<br>Includes bibliographical references.<br>Polyhydroxybutyrate (PHB) is a material with significant potential for commercial applications. It has material properties similar to isotactic polypropylene; it can be produced from renewable resources; it is biodegradable. Unfortunately, it is very brittle when compared to polypropylene. The physical property that most significantly affects elastic behavior is molecular weight. In an effort to understand how molecular weight is formed in PHB production,

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4

Li, Melissa. "A microscale molecular weight analysis method for characterizing polymers solutions of unknown concentrations." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/31673.

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Thesis (M. S.)--Biomedical Engineering, Georgia Institute of Technology, 2009.<br>Committee Chair: Hang Lu; Committee Co-Chair: Rachel Chen; Committee Member: Johnna Temenoff; Committee Member: Yonathan Thio. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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5

Aktaş, Ece. "Low-Molecular Weight Molecules as Selective Contacts for Perovskite Solar Cells." Doctoral thesis, Universitat Rovira i Virgili, 2021. http://hdl.handle.net/10803/672777.

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La tecnologia fotovoltaica és una de les fonts d'energia neta i renovable més prometedores per reduir l'impacte ambiental dels combustibles fòssils en les últimes dècades. en aquest context, les perovskites són un material que ha atret recentment una atenció important a causa de la seva capacitat per aconseguir eficiències de conversió molt elevades. Les capes de càrrega selectiva juguen un paper crucial en el ràpid augment del rendiment del dispositiu i en l'estabilitat de les cel·les solars de perovskita. Recentment, l'aplicació de mono-capes auto-assemblades formades per molècules orgànique

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6

Adebekun, Aderinola Kolawole. "On-line control of molecular weight distribution." Thesis, Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/12039.

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7

Hui, Yu 1977. "Heterjunctions of small molecular weight organic semiconductors." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=81540.

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Photodiodes made of small molecular weight organic semiconductors have been fabricated. The organic materials under investigation are p-type Copper phthalocyanine (CuPc) and n-type 3,4,9,10-perylenetetracarboxylic bisbenzimidazole (PTCBI). Current-voltage and capacitance-voltage measurements have been performed to evaluate the electrical properties of the organic photodiodes. Optical measurements including responsivity and temporal response have also been carried out. It has been found that device efficiency of the photodiodes is influenced by the thickness of organic layers as well as

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8

Hoogland, J. S. "Properties of low molecular weight food surfactants." Thesis, University of Bristol, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333908.

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9

Amer, Ismael. "Molecular weight effects on crystallization of polypropylene." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6649.

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Thesis (PhD)--University of Stellenbosch, 2011.<br>ENGLISH ABSTRACT: The crystallization of polyolefins is an important parameter in determining the properties of such materials. The crystallization phenomenon generally depends on the molecular symmetry (tacticity) and molecular weight of the material. In this study, a series of polypropylenes was prepared using heterogeneous MgCl2-supported Ziegler catalysts with two different external donors, diphenyldimethoxysilane (DPDMS) and methyl-phenyldimethoxysilane (MPDMS), and two different homogeneous metallocene catalysts, racethylene- bis(i

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10

Forde, Janice. "The molecular biology of the high molecular weight glutenin subunits of wheat." Thesis, Rothamsted Research, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.352836.

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11

Tate, Kenneth Roy. "Extrusion and orientation of higher molecular weight polyethylenes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1992. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ27807.pdf.

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12

Hettiarachchi, Rohan Jagath Kumara. "Venous thromboembolism, cancer and low molecular weight heparin." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2000. http://dare.uva.nl/document/84386.

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13

Roberts-Thomson, Peter John. "Low molecular weight IgM in health and disease /." Title page, index and abstract only, 1987. http://web4.library.adelaide.edu.au/theses/09MD/09mdr648.pdf.

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14

Liu, Nannan 1973. "Molecular weight distribution of long chain branched polyethylene." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=79248.

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To fully understand the properties of Long Chain Branched Metallocene Polyethylene (LCB mPE), we need to understand its molecular structure and Molecular Weight Distribution (MWD). Gel Permeation Chromatography (GPC) is the most important and widely applied technique to measure the MWD. In this analytical technique, polymer molecules are fractionated by their hydrodynamic volume (i.e. the sizes of polymer molecules in dilute solution). This work is focused on the simulation of GPC for the MWD of LCB mPE.<br>The polymerization reaction mechanism of LCB mPE provides a method to simulate t

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15

Wood-Adams, Paula. "Determination of molecular weight distribution from rheological measurements." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22683.

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An important characteristic of a polymer is its molecular weight distribution (MWD). The MWD affects both the processing and solid state performance properties of polymeric materials. Currently the analytical method for evaluating MWD involves the use of gel permeation chromatography (GPC). This is a labor and time intensive procedure, with the accuracy of the results depending strongly on the skill and experience of the equipment operator. Furthermore, GPC is not sensitive to small amounts of high molecular weight material that can have an important effect on processing and product properties

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16

Kronholm, David Franklin 1967. "Molecular weight growth pathways in fuel-rich combustion." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/8996.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 2000.<br>Includes bibliographical references.<br>Polycyclic aromatic hydrocarbons (P AH) and soot are formed when a hydrocarbon fuel is oxidized under fuel-rich conditions. The distinction between what constitutes the largest P AH molecule and the smallest soot particle is arbitrary; the formation processes of both can be placed under the heading of molecular weight growth. Evidence exists for the carcinogenicity of many P AH molecules. Soot is used as a component of dyes and as an additive to rubbers as

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17

Pawlus, Sebastian, Yoshi Hayashi, Kunal Kumar, and Alexei P. Sokolov. "Dynamic crossover in polymers, role of molecular weight." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-194211.

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18

Pawlus, Sebastian, Yoshi Hayashi, Kunal Kumar, and Alexei P. Sokolov. "Dynamic crossover in polymers, role of molecular weight." Diffusion fundamentals 6 (2007) 80, S. 1-2, 2007. https://ul.qucosa.de/id/qucosa%3A13209.

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19

Karanfilov, Christopher. "ION IMPLANTATION OF ULTRA-HIGH MOLECULAR WEIGHT POLYETHYLENE." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1243981285.

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20

Weidknecht, Marcia E. "Mechanical Properties of Very High Molecular Weight Polyisobutylene." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1404846490.

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21

Mauron, Thomas. "Influence of low molecular weight heparin and low molecular weight dextran sulfate on the inhibition of coagulation factor XIa by serpins /." Bern : Hämatologisches Zentrallabor der Universität Inselspital, 1998. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.

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22

Ghielmi, Alessandro. "Molecular weight distribution and gel formation in emulsion polymerization /." [S.l.] : [s.n.], 1999. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=13436.

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23

Tups, Alexander. "Molecular and neuroendocrine determinants of seasonal body weight regulation." [S.l.] : [s.n.], 2005. http://archiv.ub.uni-marburg.de/diss/z2006/0063.

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24

Fernández, Fleischhaver Daniel Hugo. "Discovery and characterization of small molecular weight metallocarboxypeptidase inhibitors." Doctoral thesis, Universitat Autònoma de Barcelona, 2009. http://hdl.handle.net/10803/3623.

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Las hidrolasas son enzimas que catalizan la ruptura del enlace amida o peptódico, y por lo tanto son denominadas también proteasas o peptidasas. Las proteasas constituyen cerca del 2 % del genoma humano, lo que representa unos 600 productos génicos. De acuerdo con el residuo catalóticamente activo, existen seis grandes grupos de peptidasas. En este trabajo nos centraremos en la familia M14 de peptidasas, también denominadas metalocarboxipeptidasas (CPs) debido a que su actividad catalótica reside en el ion zinc presente en el sitio activo de la enzima. En el genoma humano, se han identificado

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25

Krywko, William P. "Modelling morphology and molecular weight development in emulsion homopolymerization." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ36045.pdf.

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26

Adebekun, Aderinola Kolawole. "On-line estimation and control of molecular weight distribution." Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/11765.

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27

Kuo, Betsy P. "Narrowing the molecular weight distribution of linear alcohol ethoxylates." Thesis, Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/11773.

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28

Gao, Ping. "Swelling and drawing behaviour of ultrahigh molecular weight polyethylene." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335714.

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29

Ding, Yifu. "Influence of Molecular Weight and Architecture on Polymer Dynamics." University of Akron / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=akron1115933800.

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30

Chen, Qiang. "The major chloroplast low molecular weight heat shock protein." Diss., The University of Arizona, 1992. http://hdl.handle.net/10150/185849.

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The goal of this dissertation is to provide information critical for understanding the function of the major chloroplast LMW HSP. The results of this research show that the production of a nuclear-encoded, chloroplast LMW HSP is a highly conserved event in the plant HS response, and that the HSP itself is highly homologous in divergent plant species. Three major conserved regions were identified in the chloroplast LMW HSP. The carboxyl-terminal HS domain of the chloroplast LMW HSP is also found in cytoplasmic LMW HSPs and identifies it as a member of the superfamily of eukaryotic LMW HSPs. The

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31

Song, Yang. "OXIDATIVE DEPOLYMERIZATION OF LIGNIN TO LOW MOLECULAR WEIGHT AROMATICS." UKnowledge, 2019. https://uknowledge.uky.edu/chemistry_etds/114.

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To date, most lignocellulosic biorefinery strategies have focused on optimizing conversion of cellulose to ethanol, leaving lignin as an underutilized biomass constituent. Lignin is engineered by nature with the intent to protect plants from chemical and biological attack; this leaves lignin with high structural irregularity and recalcitrance, rendering conversion of the lignin macromolecule to valuable products particularly challenging. Nevertheless, given that the economics of cellulosic ethanol production are strongly dependent on the value that can be obtained for the lignin co-product, th

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32

Chang, Natasha Anna 1974. "The effect of molecular orientation on the wear of ultra-high molecular weight polyethylene." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/46240.

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33

Brás, Ana Rita Elias. "Influence of constraining and confinement in the molecular mobility of low molecular weight materials." Doctoral thesis, FCT - UNL, 2009. http://hdl.handle.net/10362/2670.

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Dissertation presented to obtain a Ph.D. Degree in Chemical Physics<br>Despite the importance that the glassy state has nowadays, the transition from liquid to the glass, glass transition, still remains a matter of debate which constitutes one of the great condensed matter physics challenges. Since this fact is closely related to the cooperativity dynamics, the study of this phenomenon in glass-forming liquids under confinement in the nanometer scale, has recently emerged as a strategy to clarify factors such as the existence of an inherent length scale of the cooperative dynamics that determ

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34

Hedge, P. J. "Molecular genetic approaches to the structure of a high molecular weight penicillin-binding protein." Thesis, University of Sussex, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372053.

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35

Benner, Susanne. "Freisetzung von Bradykinin aus High Molecular Weight Kininogen durch Plasmakallikrein /." [S.l.] : [s.n.], 1994. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=10910.

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36

Rodríguez, Seco Cristina. "Low-Molecular Weight Semiconductors for Organic and Perovskite Solar Cells." Doctoral thesis, Universitat Rovira i Virgili, 2019. http://hdl.handle.net/10803/667660.

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Actualment, les fonts d'energia renovables estan atraient molta atenció degut a l'impacte negatiu que els combustibles fòssils estan causant al planeta. Les tecnologies basades en les cel·les fotovoltaiques són una alternativa sostenible per cobrir la demanda energètica mundial. El principal objectiu d'aquest treball és el disseny i la síntesis de noves molècules per tal de reemplaçar els polímers habitualment utilitzats com a molècules captadores de llum en cel·les solars orgàniques i el spiro-OMeTAD usat com a transportador de buits (HTM per les sigles en anglès "hole transporting mater

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37

Burger, Nicolaas Daniel Lombard. "Failure analysis of ultra-high molecular weight polyethyelene acetabular cups." Pretoria : [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-12142006-134036.

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38

Zhang, Zhijie. "A study of ultra-high-molecular-weight polyethylene, UHMWPE, foams." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ60758.pdf.

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39

Roukema, Mees. "High-speed spinning of ultra-high molecular weight polyethylene fibres." [S.l. : [Groningen : s.n.] ; University Library Groningen] [Host], 1991. http://irs.ub.rug.nl/ppn/291241077.

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40

Taidi, Behnam. "Control of the molecular weight of bacterial poly(3-hydroxybutyrate)." Thesis, University of Hull, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262472.

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41

Sosa, Oscar Abraham. "Microbial cycling of marine high molecular weight dissolved organic matter." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/104332.

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Thesis: Ph. D., Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Department of Civil and Environmental Engineering; and the Woods Hole Oceanographic Institution), 2015.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references.<br>Microorganisms play a central role mediating biogeochemical cycles in the ocean. Marine dissolved organic matter (DOM) - a reservoir of organic solutes and colloids derived from plankton is a major source of carbon, nutrients, and energy to microbial communities. The biological transform

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42

Ivy, Diane Jean. "Trends and inferred emissions of atmospheric high molecular weight perfluorocarbons." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/78537.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 115-119).<br>Atmospheric observations and atmospheric observation-based global emission estimates are presented for the five high molecular weight perfluorocarbons (PFCs): decafluorobutane (C 4 F 1 0 ), dodecafluoropentane (C5 F1 2 ), tetradecafluorohexane (C 6 F14 ), hexadecafluoroheptane (C 7F 16 ) and octadecafluorooctane (C8 F 18 ). Their atmospheric histories are based on measurements of 36 No

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43

Boontongkong, Yot. "Orientation of channel die-compressed ultra-high molecular weight polyethylene." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/46093.

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44

Cheuk, Sherwin. "Glucose and Glucosamine Derivatives as Novel Low Molecular Weight Gelators." ScholarWorks@UNO, 2008. http://scholarworks.uno.edu/td/868.

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Low molecular weight gelators (LMWGs) are small molecules that are capable of entrapping solvents to form a gel in organic solvents or aqueous solution. These compounds rely solely on noncovalent forces to form the fibrous networks necessary to entrap a variety of solvents. The organogels and hydrogels thus formed could have applications in a variety of fields from environmental to biological to medicinal. Carbohydrates are ideal starting materials to synthesize LMWGs, because of their natural abundance, dense chirality, and biocompatibility. D-Glucose is the most common monosaccharide and D-

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45

Williams, Kristopher Aaron. "Synthesis and Characterization of Monosaccharide-derived Low Molecular Weight Gelators." ScholarWorks@UNO, 2011. http://scholarworks.uno.edu/td/135.

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Low molecular weight gelators (LMWGs) are interesting materials whose applications are as diverse and wide ranging as their molecular structures. These materials self-assemble through the formation of non-covelent intermolecular forces and interactions to form supramolecular assemblies that trap solvent within their matrices. Because of the non-covalent nature of the forces of self-assembly, the gelation process is typically thermally reversible. In addition, low molecular weight gelators can also be modified to respond to various stimuli, such as change in pH, presence of enzymes or metal cat

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46

Yang, Hao. "Synthesis and characterization of sugar based low molecular weight gelators." ScholarWorks@UNO, 2012. http://scholarworks.uno.edu/td/1496.

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Low molecular weight gelators (LMWGs) have gained great attention over the past two decades. These compounds form self-assembled fibrous networks like micelles, cylindrical, sheets, fibers, layers and so on. The fibrous network entraps the solvent and form gel. LMWGs are interesting compounds with many potential applications in material and biomedical sciences. Many different structures have been found to be good LMWGs. Our interests focus on the carbohydrate based LMWGs. Previously, we have found that several ester derivatives of methyl 4, 6-O-benzylidene-α-D-glucopyranoside are good gelators

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47

Burger, N. D. L. (Nicolaas Daniel Lombard). "Failure analysis of ultra-high molecular weight polyethyelene acetabular cups." Thesis, University of Pretoria, 2005. http://hdl.handle.net/2263/30360.

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Owing to the crippling nature of arthritis, surgeons have been trying for well over a century to successfully treat this debilitating disease particularly when attacking the hip joint. In the early 1970s, Sir John Charnley started with total hip replacement as a solution to this ever-increasing problem. Many different designs were developed but all the designs revolved around a femoral stem, femoral head and acetabular component. Independent of the design, longevity of the implant remains a problem. The major cause of replacements, according to various hip registers, is due to aseptic loosenin

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48

Cobzaru, Cecilia. "Asymmetric metallocene catalysts: design of ultrahigh molecular weight polypropylene plastomers." [S.l. : s.n.], 2006. http://nbn-resolving.de/urn:nbn:de:bsz:289-vts-55721.

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49

Wernle, James David. "Micron-scale wear mechanisms in ultra high molecular weight polyethylene." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2008. http://wwwlib.umi.com/cr/syr/main.

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50

Titone, John Carlos. "Supercritical carbon dioxide sterilization of ultra-high molecular weight polyethylene." Connect to resource, 2009. http://hdl.handle.net/1811/37004.

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