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Dissertations / Theses on the topic 'Purification'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Du, Plessis Jan-Paul. "The Purification Works." Diss., University of Pretoria, 2018. http://hdl.handle.net/2263/63619.

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This dissertation aims to propose an appropriate architectural intervention within a site that requires both ecological restitution and the commemoration of industrial heritage. The Johannesburg Gasworks site serves as a clear example of how the Industrial Revolution and subsequent industrial technologies have both damaged the natural environment and left blighted legacies within ever developing urban conditions.The project aims to uphold the general significance of Industrial heritage as proposed by charters such as the Nizhny Tagil charter prepared by The International Council for the Commem

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2

Hiltbrunner, Jean-Michel. "Purification de l'hexafluorure d'uranium." Thesis, Université Clermont Auvergne‎ (2017-2020), 2017. http://www.theses.fr/2017CLFAC009.

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L’hexafluorure d’uranium, de formule chimique UF 6 , est un composé clé du cycle du combustible car il est utilisé pour l’étape d’enrichissement isotopique. Toutefois, des impuretés présentes et mélangées à l’UF 6 sont à éliminer afin de garantir un uranium de pureté nucléaire. Dans ce manuscrit, les réactions chimiques entre les polluants et les filtres chimiques retenus pour la purification sont étudiées. Par ailleurs, l’étude de la réactivité en milieu liquide est réalisée afin de se rapprocher des conditions industrielles. Une voie de recyclage des filtres chimiques est également investigu

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3

Allaire, André. "Copper matte vacuum purification." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=70215.

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An investigation of copper matte vacuum purification was undertaken. A mathematical model using monatomic, diatomic sulphide and diatomic oxide vapours of the impurities was developed to explain the vacuum refining process. The model was used to predict the overall refining rates for variables such as temperature, matte grade, oxygen activity and chamber pressure of the melt.<br>A series of experiments was undertaken to characterize the dust produced during vacuum refining of copper matte. An attempt to selectively condense the vapours produced during the vacuum refining experiments was carrie

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4

Kent, Laura. "Photocatalysts for water purification." Thesis, University of Surrey, 2018. http://epubs.surrey.ac.uk/850035/.

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Advanced water purification methods are required to answer the growing demand for clean water throughout the world. Current methods of removing the pollutants rely on moving the pollutants from one place to another rather than breaking them down. The use of advanced oxidative processes (AOPs) presents a highly effective opportunity to achieve the full mineralisation of pollutants without the added cost of regeneration methods. Photocatalysts, such as titanium dioxide and zinc oxide, can be used as AOPs when activated by electromagnetic radiation in the form of ultraviolet and visible light. To

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5

Rutt, George Clifford. "Purification of recombinant proteins." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/42614.

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6

Benzouaa, Rachid. "Purification de l'hexafluorure d'uranium." Thesis, Clermont-Ferrand 2, 2014. http://www.theses.fr/2014CLF22433.

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L’hexafluorure d’uranium (UF6), est le seul composé utilisé à l’état gazeux dans les procédés d’enrichissement pour la production du combustible nucléaire. Pour le bon déroulement de l’étape d’enrichissement, la qualité de UF6 est primordiale. Cette étude s’est intéressée principalement aux impuretés volatiles sous forme de fluorures et oxyfluorures et leur réactivité avec des matériaux en présence ou non de l’UF6. La nature des produits adsorbés et de réactions a été identifiée. Les mécanismes physico-chimiques mis en jeux lors de la sorption ont été investigués. Les performances (capacité de

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7

Albornoz, Rodrigo Nicolas. "Purification : Research & Exhibition." Thesis, Konstfack, Institutionen för Konst (K), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:konstfack:diva-6738.

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In recent years I have been working on topics related to Post-colonialism in South America, as well as the conditions of immigrants in Europe. The main interest of my work involves questions about my roots and personal stories of migration. This situation has been the engine of my art for the last ten years. Through my installations, I have tried to express or represent some certain facts, that have marked the post-colonial situation in Latin America and Europe over the last years. The slavery and exploitation of illegal labor are common working conditions for many people in South America, es

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8

Aufy, A. A. S. M. "PROTEIN PURIFICATION FROM GASTROPODS." Doctoral thesis, Università degli Studi di Milano, 2011. http://hdl.handle.net/2434/152912.

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Gastropods are a class of invertebrates within the mollusks, commonly known as snails and slugs. Recently, scientific interest is directed on snails as pollution indicators, as destroyers of crops, but also as parasites carriers. Furthermore, some species of snails are considered as an important human food source in countries like France and Australia. In scientific research, snails are used as model animals especially in molecular biology and immunology. Some snails secrete purple matter with anti-cancer property; the snails use it to protect their eggs and scientists hope to create with it

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9

Blom, Hans. "Purification Processes for Complex Biomacromolecules." Doctoral thesis, Uppsala universitet, Fysikalisk-organisk kemi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-172892.

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This thesis details various techniques and considerations for the purification of complex biomacromolecules. Initially an α-mannosidase from babaco fruit was purified using anion exchange-, lectin affinity- and size exclusion chromatography. The enzyme was approximately 260-280 kDa in size with an apparent an unusual octagonal stoichiometry and displayed properties similar to other known plant α-mannosidases. Mucins were fractionated by ion exchange and size exclusion chromatography to assess the properties that govern the mucin surface coating interactions in biomaterial research. Comme

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10

Leah, Labib. "Helicase Purification for DNA Sequencing." Thesis, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31341.

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BACKGROUND: A method to increase accuracy and ease-of-use, while decreasing time and cost in deoxyribonucleic acid (DNA) sequence identification, is sought after. Helicase, which unwinds DNA, and avidin, which strongly attracts biotin for potential attraction of biotinylated DNA segments, were investigated for use in a novel DNA sequencing method. AIM: This study aimed to (1) purify bacteriophage T7 gene product 4 helicase and helicase-avidin fusion protein in a bacterial host and (2) characterize their functionality. METHODS: Helicase and helicase-avidin were cloned for purification from bact

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11

Irving, Stephen L. "Synthesis and purification of peptides." Thesis, University of Edinburgh, 1994. http://hdl.handle.net/1842/28282.

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Improved routes to tetrabenz[<I>a,c,g,i</I>]fluorene derivatives have been developed, allowing the synthesis of N<SUP>α</SUP>-17-tetrabenzo[<I>a,c,g,i</I>]fluorenyl-methoxycarbonyl (tbfmoc) urethane derivatives of alanine, leucine, isoleucine, methionine and valine. The chloroformate and pentafluorophenyl carbonate of 17-tetrabenzo[<I>a,c,g,</I>]fluorenylmethanol have been prepared and used to introduce the base-labile Tbrmoc group onto the N<SUP>α</SUP>-termini of resin-bound peptides. The high affinity of the Tbrmoc group for porous graphitised carbon (PGC) has been exploited for the purific

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12

Lacoursière, Stéphanie. "Water purification by membrane distillation." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=26112.

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The objective of this work was to evaluate the technical feasibility of potable water production from both sea water and sodium chloride solutions via the membrane distillation process. Membrane distillation is a thermally driven process in which a hydrophobic microporous membrane separates a hot or warm saline solution from a cold desalinated one. Water, in the form of vapour, migrates from the hot solution to the cold one.<br>Two different hollow fibre membrane distillation modules were used to conduct experiments. Tests were performed to determine the sensitivity of permeate flux and qualit

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13

Davies, R. H. "Semiconductor photocatalysis for water purification." Thesis, Swansea University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636399.

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Although many aspects of the semiconductor photocatalysed mineralisation of water contaminants have been studied by researchers over the past decade, there are still certain areas which need further clarification, if the technique is to be used as an alternative to the presently available methods of water purification. It was the objective of the work in this thesis to provide further understanding of some of these remaining areas. One of the greatest inducements for the introduction of the technique of semiconductor photocatalysed pollutant mineralisation, in preference to the currently avail

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14

Gerrard, Mark Leslie. "Purification of nitrogen containing feedstreams." Thesis, Nottingham Trent University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341280.

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15

Scott, G. "Purification studies of UDP-Glucuronyltransferase." Thesis, University of Strathclyde, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371377.

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16

Choi, Siwon (Siwon Chloe). "Microfluidic engineering of water purification." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111415.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Chemical Engineering, 2017.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references.<br>The demand for clean water has been increasing for several reasons, such as rapid industrialization of developing countries, environmental pollution and climate change, and development of biofuels and the resulting irrigation growth. To meet the needs for this growing demand for clean water, desalination has become an appealing solution as saline water (brackish water, seawater and brine) are the most abundant water

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17

Wahl, Franck Olivier. "Synthesis and purification of oligodeoxyribonucleotides." Thesis, University of Edinburgh, 1993. http://hdl.handle.net/1842/14625.

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A new highly hydrophobic 5'-hydroxyl protecting group (Tbf-DMTr) has been designed for the purification of synthetic oligonucleotides. Tbf-DMTr-oligonucleotides are strongly retained on RP-HPLC allowing a facile separation from truncated sequences. Subsequently the group can be removed in acidic conditions. The fluorescent properties of TBf-DMTr enable easy detection. The synthesis and purification of long oligonucleotides (> 100-mer) has been undertaken. Additionally a new fluorescent label for oligonucleotides has been developed which enables detection of DNA probes to concentration down to

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18

Yapi, Litha. "Ammonium fluoride : transition metal purification." Diss., University of Pretoria, 2017. http://hdl.handle.net/2263/62805.

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Pelchem NF3 plant produces an ammonium acid fluoride waste stream. The material of construction for the piping and stirrer fabrication in the plant is Monel. As a predominantly nickel-copper alloy, with minute quantities of carbon, manganese, silicon, sulfur and iron, these may leach into process fluids involved. The two biggest constituents of Monel contaminate the ammonium acid fluoride waste stream. Despite being the lesser of the two in terms of the composition of the Monel, copper is higher in concentration than nickel in the waste stream: the solubility of copper (II) cation in ammonium

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19

Lyu, Shicheng. "Membraneless Water Purification via diffusiophoresis." Digital WPI, 2020. https://digitalcommons.wpi.edu/etd-theses/1360.

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Clean water is hard to obtain in certain areas, such as remote locations and during emergency response. Our study developed a membraneless water purification system using diffusiophoresis and tested the influence of various factors (gas pressure, liquid flow rate, etc.) on the turbidity of filtered water. The main component in the separation system is a tube-in-tube-in-tube separator. The inner tube and the middle tube are made of a semipermeable material (Teflon AF-2400), which allows gas (CO2) to permeate through it, but retains liquid (water). In this strategy, the CO2 permeates through the

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20

Jones, Samuel Casey. "Static mixers for water treatment : a computational fluid dynamics model." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/20718.

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21

Li, June Yonghong. "A study of ozonation kinetics of phenolic compounds in single and solute systems." Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/20821.

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22

Yang, Jingming. "Characteristics of a novel anaerobic fluidized bed reactor for waste water treatment." Diss., Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/25318.

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23

Kulati, Thanduxolo Cullinan. "Evaluation of physiochemical qualities and heavy metal levels of the final effluents of some wastewater treatment facilities in the Eastern Cape Province of South Africa." Thesis, University of Fort Hare, 2016. http://hdl.handle.net/10353/1547.

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Water is the most abundant substance in nature and vital for life activities. The major water sources for use are surface water bodies such as rivers and lakes, and underground aquifers and pore spaces down the water table (Ring, 2003). Water derived from these sources is not necessarily pure since it contains dissolved inorganic and organic substances, living organisms (viruses, bacteria, etc). For these reasons, water intended for domestic uses should be free from toxic substances and microorganisms that are of health significance (WHO, 2005). The availability and quality of water always hav

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24

Mangombo, Zelo. "The electrogeneration of hydroxyl radicals for water disinfection." Thesis, University of the Western Cape, 2006. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_5745_1190373027.

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<p>This study has shown that OHË radicals can be generated in an Fe/O2 cell from the electrode products via Fenton&rsquo<br>s reaction and used for water disinfection. The cell system in which the experiments were carried out was open and undivided and contained two electrodes with iron (Fe) as the anode and oxygen (O2) gas diffusion electrode. Typically, 100 ml of Na2SO4.10H2O (0.5M) solution was used as a background electrolyte. OHË radicals were produced in-situ in an acidic solution aqueous by oxidation of iron (II), formed by dissolving of the anode, with hydrogen peroxide (H2O2). The H

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25

Weinberg, Marla Kaye. "The effectiveness of an electrochemical treatment process and its applications in textile wastewater treatment." Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/8697.

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26

Skeens, Brian Michael. "Pilot scale evaluation and comparison of static mixers for coagulation in water treatment." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/19522.

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27

Shah, Anup G. "Fate and effect of the antioxidant ethoxyquin on a mixed methanogenic culture." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/19904.

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28

Palazolo, Paul Joseph. "Use of genetic algorithms in bounded search for design of biological nitrification/denitrification waste treatment systems." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/32777.

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29

Wong, Kit Iong. "Chemical removal of dichloromethane (DCM) from contaminated water using advanced oxidation processes (AOPs) :Hydrogen Peroxide Ozone UV." Thesis, University of Macau, 2018. http://umaclib3.umac.mo/record=b3868740.

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30

Chang, Li-Ching. "Cloning, purification and crystallization of selenophosphate synthetase cloning, purification and crystallization of ERp44 from Mus musculus /." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=980297311.

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31

Forrer, Nicola. "Antibody purification with ion-exchange chromatography." Zürich : ETH, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17784.

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32

Mandal, Ipshita. "Microcapillary membranes for purification of biomolecules." Thesis, University of Cambridge, 2016. https://www.repository.cam.ac.uk/handle/1810/255867.

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Opportunities exist for alternative chromatography separation media which possess high binding capacity and throughput, avoid column packing, are economically feasible for single-use disposability and work with standard chromatography systems. Two types of microcapillary membranes, hollow fibre membranes (HFM) and microporous walled microcapillary film (MMCF) membranes have been previously studied for a diverse range of filtration applications. The MMCF membranes unique geometry has not yet been studied for separation of biomolecules. The aim of this thesis is to develop microcapillary membran

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33

Sanghera, Jasbinder Singh. "Purification and regulation of CTP:phosphocholine cytidylyltransferase." Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/29280.

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CTP:phosphocholine cytidylyltransferase was purified to homogeneity using a procedure involving aggregation of enzyme with exogenous lipid and selective dissociation with detergents and chromatography on conventional and FPLC columns. SDS-PAGE of purified enzyme showed a single protein of molecular weight ~42 Kd. Native-PAGE showed the protein to migrate at a molecular weight of ~90 Kd, indicating that the native enzyme may be a dimer. IEF-PAGE revealed the enzyme to have a pI of ~5.8. 2-D-PAGE showed the enzyme to have at least two isoforms. Attempts to generate polyclonal antibody to the pur

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34

Cinar, Dursun. "Purification and antimicrobial properties of oleuropein." Thesis, University of West London, 2009. https://repository.uwl.ac.uk/id/eprint/381/.

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Olive leaves contain substantial amounts of phenolic substances, including the polyphenol oleuropein. This compound has been reported to possess antimicrobial properties. The purpose of this study was to develop an improved method for the extraction and purification of oleuropein from olive leaves and characterise its activity as well as the mode of action against a range of bacteria. Phenolic compounds from olive leaves were extracted in methanol and oleuropein was separated from the mixture by countercurrent chromatography (CCC). Separation was confirmed by high performance liquid chromatogr

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35

Abedinzadegan, Abdi Majid. "Purification of partially degraded diethanolamine solutions." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq25006.pdf.

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36

Huang, Da Wei. "Purification and characterization of HP1 oligomers." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape10/PQDD_0006/MQ44185.pdf.

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37

Roche, Iain. "Nanoporous polymeric adsorbents for blood purification." Thesis, Loughborough University, 2009. https://dspace.lboro.ac.uk/2134/8143.

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This thesis is concerned with applying engineering principles to the use of polymeric nanoporous adsorbents for use in blood purification to obtain original knowledge. Styrene divinylbenzene copolymer nanoporous adsorbents offer a potential means to remove middle molecular (MM) sized molecules when in direct contact with blood. (Continues...).

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38

Wang, S. "Acetic acid purification using ionic liquids." Thesis, Queen's University Belfast, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.546433.

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39

Forde, G. M. "Plasmid DNA purification by affinity methods." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.599116.

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Two affinity mechanisms were investigated for their suitability to pDNA purification: (1) GSH/GST-ZnF/pTS: a dual affinity fusion protein, comprised of Glutathione-S-Transferase (GST) and a zinc finger transcription factor (ZnF), was utilised to purify target pDNA. The fusion protein was firstly adsorbed to an immobilised glutathione (GSH) ligand via the GST segment followed by specific adsorption of a pUC19 based plasmid (pTS) to the exposed zinc finger; and (2) lac I peptide/pLS3: a lac repressor (lacI) peptide that displays affinity for lac operator (lacO) sequences was used to purify targe

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40

Blackwelder, Sara K. "Syncretism in contemporary pagan purification practices." Honors in the Major Thesis, University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/1370.

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This item is only available in print in the UCF Libraries. If this is your Honors Thesis, you can help us make it available online for use by researchers around the world by following the instructions on the distribution consent form at http://library.ucf.edu/Systems/DigitalInitiatives/DigitalCollections/InternetDistributionConsentAgreementForm.pdf You may also contact the project coordinator, Kerri Bottorff, at kerri.bottorff@ucf.edu for more information.<br>Bachelors<br>Sciences<br>Anthropology

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41

Kerry, Maria Elizabeth. "Purification and characterisation of callose synthase." Thesis, Royal Holloway, University of London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394540.

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Santoyo-Gutierrez, Socrates. "Absorption heat pump assisted effluent purification." Thesis, University of Salford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245055.

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43

Foaden, Shaun Patrick. "Continuous affinity partitioning for protein purification." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335093.

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44

Ramat, Fabien M. "Protein purification using expanded bed chromatography." Digital WPI, 2004. https://digitalcommons.wpi.edu/etd-theses/92.

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Expanded bed chromatography using ion-exchange media is a powerful first step in purification processes. Expanded bed chromatography can be used to extract components from complex and viscous solution. This can be achieved because of the void created between adsorbent particles where as in packed bed chromatography, the adsorbent is too compact and dense for a complex feed stock to flow through. Expanded bed chromatography was used to purify bovine serum albumin (BSA) from chicken egg white (CEW). The high viscosity of CEW presents a unique challenge for efficient large-scale protein purificat

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45

Hahne, Hampus. "Modification of nanocellulose for blood purification." Thesis, Uppsala universitet, Nanoteknologi och funktionella material, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-296218.

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This reports treats chemicalmodification of nanocellulose with aimto employ it in dialysis. Themodification steps consists of oxidizingand sulfonation reactions. Infra-redspectroscopy, BET surface area analysisand zeta potential was used tocharacterize the modified nanocellulose.The results shows that the modifiednanocellulose achieve the desiredproperties.

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Fernandes, Telma Godinho Barroso Maciel. "Functional monolithic platforms for antibody purification." Doctoral thesis, Faculdade de Ciências e Tecnologia, 2014. http://hdl.handle.net/10362/11550.

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Dissertação para obtenção do Grau de Doutor em Química Sustentável<br>Fundação para a Ciência e Tecnologia - contracts PEst-C/EQB/LA0006/2011, MIT-Pt/BS-CTRM/0051/2008, PTDC/EBB-BIO/102163/2008, PTDC/EBBBIO/ 098961/2008, PTDC/EBB-BIO/118317/2010 and doctoral grant SFRH/ BD/62475/2009, and Fundação Calouste Gulbenkian

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47

Stevenson, Steven A. "Chromatography and purification of endohedral metallofullerenes." Diss., Virginia Tech, 1995. http://hdl.handle.net/10919/29176.

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At the conception of this research, a separation methodology for obtaining purified metallofullerene [ A<sub>m</sub>@C<sub>2n</sub>; m = # of metal atoms, A, and C<sub>2n</sub> = # of carbons in the surrounding cage] samples was not yet developed. Isolation of these metal-encapsulated fullerenes was strongly desired for characterization of their physical and chemical properties. Predicted applications for these novel species include their use as possible superconductors, catalysts, and non-linear optical devices. However, initial purification efforts have been hindered by several difficulties.

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48

Yang, Zi. "INORGANIC MEMBRANES FOR WATER PURIFICATION APPLICATIONS." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1588556057684163.

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49

Talha, Fouzia Tagmouti. "Séparation et purification de quelques ciguatoxines." Bordeaux 1, 1987. http://www.theses.fr/1987BOR10576.

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Purification par diverses techniques chromatographiques d'extraits ciguatoxiques bruts obtenus a partir de poissons contamines appartenant a la famille des carangides et des scombrides. Etude de la structure et des activites biologiques des ciguatoxines ainsi separees (action sur des organes isoles de grenouille)

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50

Amourache, Leïla. "Purification et immobilisation de la chymosine." Compiègne, 1986. http://www.theses.fr/1986COMPI217.

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La chromatographie d'affinité utilisant un ligand biospécifique (pepstatine couplée à l'agarose) pour la purification de la chymosine permet l'obtention d'un rendement en activité de 60 % et un facteur de purification de 6, à partir d'un extrait brut. Cependant, le ligand acide aminé histidine couplé au Sepharose 4B et à la silice, a donné de meilleurs résultats, on obtient respectivement après purification de la chymosine, à partir d'un extrait brut : des rendements en activité de 330 %, 55 % ; et des facteurs de purification de 26 et 9. Le L-histidyl-silice présente des résultats peu satisfa

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