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Dissertations / Theses on the topic 'Polyketone'

Author: Grafiati

Published: 4 June 2021

Last updated: 15 February 2022

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1

Malinova, Violeta. "Synthesis of novel functional poly(1,4-ketone)s bearing pendant bioactive moieties: an approach to design biocompatible materials." [S.l. : s.n.], 2006. http://nbn-resolving.de/urn:nbn:de:bsz:289-vts-56265.

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2

Lommerts, Bert Jan. "Structure development in polyketone and polyalcohol fibers." [S.l. : [Groningen : s.n.] ; University Library Groningen] [Host], 1994. http://irs.ub.rug.nl/ppn/290728010.

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3

Sunjuk, Mahmoud Shaker Ahmed. "Emulsion copolymerization of alpha-olefins with carbon monoxide using water-soluble palladium(II) complexes." [S.l. : s.n.], 2003.

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4

Li, Maohua. "Synthesis of Polyketones from Zwitterionic Nickel Compound Catalyzed Copolymerization of Carbon Monoxide And Olefins." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1461772542.

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5

He, Shiyu. "Synthesis of New Zwitterionic Nickel(II) Catalyst For Ethylene and Carbon Monoxide Copolymerization." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1524763348307418.

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6

Jiang, Bo. "Homo- and co-polymerization of disubstituted ketenes." Thesis, Normandie, 2019. http://www.theses.fr/2019NORMIR02/document.

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Ce travail vise à synthétiser avec un rendement satisfaisant de nouvelles architectures de polymères à hautes performances, possédant une structure définie et une bonne fenêtre de transformation, sur la base de cétènes aliphatiques ou aromatiques disubstitués. Les synthèses de diméthylcétène (DMK), méthyléthylcétène (MEK), diéthylcétène (DEK), éthylphénylcétène (EPK) et diphénylcétène (DPK) ont été étudiées. Puis l’homo- et la copolymérisation de ces monomères avec différents amorceurs ont été étudiées. L’influence de l’encombrement stérique présent sur les cétènes influence grandement leur ré

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7

Hayki, Najib. "Synthèse et caractérisation de nouveaux polymères obtenus à partir de l'éthylcétène." Phd thesis, INSA de Rouen, 2011. http://tel.archives-ouvertes.fr/tel-00633323.

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L'objectif de cette étude est de synthétiser de nouveaux polymères aux propriétés spécifiques, en utilisant pour la première fois comme monomère un aldocétène : l'éthylcétène. La synthèse de l'éthylcétène a été entreprise en utilisant deux procédés distincts :d'une part la méthode de McCarney, qui a permis de le préparer dans un solvant par entraînement à la vapeur, et d'autre part le craquage de l'anhydride butyrique à 575°C sous 40mbar.La polymérisation ionique de l'éthylcétène a ensuite été réalisée, dans différentes conditions de solvant, de température et avec plusieurs amorceurs. La poly

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8

Wang, Hanbin. "Synthèse et caractérisation de nouvellespolycétones aliphatiques à partir des cétènes." Phd thesis, INSA de Rouen, 2013. http://tel.archives-ouvertes.fr/tel-00973486.

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L'objectif de cette étude est de synthétiser de nouvelles architectures de polycétones aliphatiques à base de cétènes, possédant une température de fusion plus basse que le polydiméthylcétène, tout en conservant une température de dégradation élevée, afin d'élargir sa fenêtre de mise en œuvre.La synthèse du diméthylcétène et / ou de l'éthylcétène a été réalisée par pyrolyse de l'anhydride isobutyrique et/ou butyrique à 625°C sous 40 mbar. Un copolymère statistique a été d'abord synthétisé par copolymérisation entre le diméthylcétène et l'éthylcétène, par voie cationique à -78°C ; ensuite en ut

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9

Ndiege, Isaiah Omolo. "Polyketide biosynthesis." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315331.

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10

Ignatenko, Vasily A. "MOLECULAR LIBRARY SYNTHESIS USING NATURAL PRODUCTS: EXPANDING THE FRAMEWORK OF STEROIDS AND PENTACYCLIC TRITERPENOIDS." Case Western Reserve University School of Graduate Studies / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=case1384382654.

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11

Harris, Rebecca Clare. "Polyketide synthase enzymes." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360886.

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12

McAndrew, Douglas. "Studies on polyketide biosynthesis." Thesis, University of Bristol, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337292.

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13

Sarafimidis, Ioannis. "Polyketide signalling in Dictyostelium." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.615971.

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14

Zhang, Youchun. "Chemical modifications and applications of alternating aliphatic polyketones." [S.l. : [Groningen : s.n.] ; University of Groningen] [Host], 2008. http://irs.ub.rug.nl/ppn/.

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15

Galloway, I. S. "The avermectin-producing polyketide synthase." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.599283.

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In this work, sequencing of an approximately 14kb region of the avermectin cluster has revealed that the first two modules are apparently housed in one polypeptide, AVES1. Comparison of this sequence with those from other PKSs has indicated a region of the acyl transferase (AT) domain that can be used to predict whether the domain's polyketide chain-extender unit specificity is for malonyl CoA or methyl-malonyl CoA. Further analysis showed an exact correlation between all the other domains required for completion of the first two polyketide chain-extension cycles, as predicted from the structu

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16

Walsh, Maura Stephanie. "Cloning fungal polyketide synthase genes." Thesis, University of Bristol, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333957.

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17

Bush, B. D. "Biomimetic studies in polyketide synthesis." Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356673.

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18

Marsden, Andrew F. A. "The erthromycin-producing polyketide synthase." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243196.

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19

Spargo, P. L. "Biomimetic synthesis of polyketide anthraquinones." Thesis, University of Cambridge, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383910.

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20

Dunster, Nicholas James. "Chain initiation of polyketide synthases." Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624499.

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21

Long, Paul Frederick. "Genetic engineering of polyketide biosynthesis." Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624595.

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22

Dall'Aglio, Patrick. "Structural studies on polyketide enzymes." Thesis, University of Bristol, 2008. http://hdl.handle.net/1983/22082f07-d6ef-47e1-ac8f-ba89ada01002.

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Polyketides are a class of secondary metabolites that includes compounds with antibiotic and anticancer properties. In type I polyketide synthesis, the individual activities are arranged into large | polyproteins, while in type II polyketide synthesis enzymes are encoded separately. Streptomyces coelicolor actinorhodin acyl carrier protein synthase (AcpS) IS a promiscuous enzyme involved in type II polyketide synthesis that catalyses the transfer of the phosphopantetheine chain from coenzyme A (CoA) to acyl carrier protein (ACP).

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23

Diederichs, Jan. "Synthese von chinoiden Naturstoffen ein neuer Weg zum 2'-Desalkyl-Mumbaistatin /." [S.l. : s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=975809407.

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24

Haslam, Claire Elizabeth. "Organometallic mechanisms and reactivity : towards new catalysts for polyketones." Thesis, University of Sheffield, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310787.

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25

Kosaka, Naoyuki. "Studies on Stereocontrolled Functionalization of Optically Active γ-Polyketones". 京都大学 (Kyoto University), 2004. http://hdl.handle.net/2433/147623.

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26

Rahman, M. Mujibur. "Synthetic studies of polyketide related compounds." Thesis, University of Bristol, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.412270.

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27

Saunders, Natalie. "Synthesis of intermediates for polyketide biosynthesis." Thesis, University of Bristol, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.420887.

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28

Handa, Sandeep. "Biosynthetic studies on the polyketide metabolites." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307902.

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29

Wilkinson, Christopher John. "Chain initiation on modular polyketide synthases." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621331.

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30

Ranganathan, Anand. "Studies on hybrid modular polyketide synthases." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624959.

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31

Hari, Taylor P. A. "Chemoenzymatic Synthesis of Polyketide Natural Products." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37220.

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Polyketide secondary metabolites constitute a structurally-diverse and clinically-important family of natural products. The wide range of biological activities represented by these substrates have contributed to therapeutic agents with annual sales exceeding $20B USD. Large multi-domain proteins called polyketide synthases (PKSs) use simple building blocks to generate highly-oxygenated and stereochemically-rich frameworks with astonishing selectivity. These substrates often feature rigidifying biases imposed by macrocyclic lactones and substituted heterocycles, which can impact their bioactive

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32

Stenzel, Desmond John Francis. "Biosynthesis of some polyketide fungal metabolites." Thesis, University of Edinburgh, 1986. http://hdl.handle.net/1842/13006.

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33

Mandel, Alexander. "Synthetic studies applied to polyketide natural products." Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2008. http://wwwlib.umi.com/cr/ucsd/fullcit?p3288813.

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Thesis (Ph. D.)--University of California, San Diego, 2008.<br>Title from first page of PDF file (viewed January 14, 2008). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 142-155).

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34

Beltran-Alvarez, Pedro. "Kinetic studies on the actinorhodin polyketide synthase." Thesis, University of Bristol, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492551.

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The actinorhodin (act) minimal polyketide synthase (PKS) from Streptomyces coelicolor consists of three proteins: an acyl carrier protein (ACP), and two P-ketoacyl ACP synthase components known as KSa and KSp. The act minimal PKS catalyzes at least 18 separate reactions, which can be divided into loading, initiation, extension, and cyclization and release phases.

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35

Boakes, S. "A new polyketide synthase in Saccharopolyspora erythraea." Thesis, University of Cambridge, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.596741.

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Amino acid and DNA sequence comparisons of modular PKSs have shown that ketosynthase (KS) domains are highly conserved. Degenerate primers were designed and used in polymerase chain reactions (PCRs) to amplify the DNA encoding these enzymatic domains from a range of streptomycete genomic templates. Analysis of the PCR products did not only identify a number of known KS domains but included a number of unknown KSs. Using one of these products as a probe to screen a genomic library, a new PKS gene cluster has been identified in <i>Saccharopolyspora erythraea. </i>This new PKS gene cluster, named

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36

Bali, Shilpa. "Enzymology of type I modular polyketide synthases." Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.596310.

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Modular type I polyketide synthase (PKSs), for example the 6-deoxyerythronolide B synthase (DEBS) responsible for formation of the aglycone core of erythromycin A, are giant, multifunctional enzyme complexes that catalyse the orchestrated assembly line biosynthesis of antibiotic polyketide natural products. To analyse these multienzymes in detail, this research aimed to study the enzymology of individual catalytic domains, including the ketoreductase (KR), enoyl reductase (ER) and ketosynthase (KS) activities, by expressing them as discrete recombinant proteins. Ketoreductase domains derived f

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37

Tam, Wan-ting, and 譚韻婷. "Characterization of polyketide synthases in penicillium marneffei." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hdl.handle.net/10722/197137.

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Penicillium marneffei is a thermal dimorphic fungus that causes systemic mycosis in HIV-positive patients. The fungus displays unique phenotypic properties, including the yellow and black pigments on its conidia as well as the secretion of a diffusible red pigment during growth in mycelial phase. However, all these pigments have not been characterized. Investigation into the pigment production of the fungus can provide insights into the functions of the respective pigment to the fungus as well as their roles in fungal pathogenesis. This study reports the identification and characterization

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38

Axford, Lorraine Claire. "Synthetic and biosynthetic studies on polyketide intermediates." Thesis, University of Bristol, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.420905.

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39

Wiesmann, Kristen E. H. "Engineering of the erythromycin-producing polyketide synthase." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264505.

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40

Tang, Yinyan. "Structural and mechanistic analysis of polyketide synthases /." May be available electronically:, 2008. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.

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41

Drulyte, Ieva. "Structural and functional studies of polyketide synthases." Thesis, University of Leeds, 2018. http://etheses.whiterose.ac.uk/22568/.

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Polyketides, natural products produced by multi-domain polyketide synthases (PKSs), have proven to be excellent starting points for drug discovery. Rational engineering of PKSs holds much promise for the generation of novel polyketide pharmaceuticals, however to enable this we need to gain a better understanding of how the mature polyketides are generated and how individual modules within a polyketide synthase assemble and interact. Here, work was performed to investigate three polypeptides from natural product indanomycin and rhizoxin biosynthesis, including the candidate polyketide cyclase I

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42

Farmer, Rohit. "Modelling polyketide synthases and related macromolecular complexes." Thesis, University of Birmingham, 2015. http://etheses.bham.ac.uk//id/eprint/5909/.

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Polyketide synthases (PKS) are enzyme complexes that synthesise many natural products of medicinal interest, notably a large number of antibiotics. The present work investigated the mupirocin biosynthesis system, comparing it with similar pathways such as thiomarinol and kalimantacin. The focus was on the structural modelling of the protein complexes involved in antibiotic synthesis, via molecular simulation and the analysis of structural and sequence data. Structural docking of acyl carrier proteins (ACP) cognate for an HMG-CoA synthase orthologue responsible for β-methylation (MupH) identifi

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43

Thwaite, Jonathan Simon. "Chain initiation in type II polyketide biosynthesis." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.615842.

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44

Moore, Andrew. "Mechanisms of chain termination in polyketide biosynthesis." Thesis, University of Cambridge, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612033.

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45

Hughes-Thomas, Zoë Alexandra. "Biosynthetic studies of the monensin polyketide synthase." Thesis, University of Cambridge, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.619650.

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46

O'Connell, Yvonne. "Synthesis of putative polyketide precursors and intermediates." Thesis, University of Bristol, 2007. http://hdl.handle.net/1983/50eec4a3-eb82-4361-802f-805d2173491d.

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47

Smith, Cameron James. "The thioesterase of the erythromycin polyketide synthase." Thesis, University of Cambridge, 1995. https://www.repository.cam.ac.uk/handle/1810/271990.

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48

Sun, Lei. "Investigation and Engineering of Polyketide Biosynthetic Pathways." DigitalCommons@USU, 2017. https://digitalcommons.usu.edu/etd/6903.

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This research is focused on investigation and engineering of natural product biosynthetic pathways for efficient production of pharmaceutically important molecules or generation of new bioactive molecules for drug development. Natural products are an important source of therapeutics, such as chromomycin (anti-cancer), emodin (anti-inflammatory and anti-tumor) and sprolaxine (anti-Helicobacter pylori). Metabolic engineering of natural product biosynthetic pathways shows its promise for creating and producing valuable compounds with chemical diversity for drug discovery. One goal of this researc

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49

Degenhardt, Falko. "Modellsynthesen und Strukturaufklärung von Polyketiden sowie Arbeiten zur Biosynthese von Mimosin." [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=962816310.

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50

Williams, Lorenzo. "Synthetic studies towards Jaspamide and the Geodiamolides." Thesis, University of Salford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358278.

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