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Rozprawy doktorskie na temat „Glycosidic bonds”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 19 lutego 2022

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Sprawdź 19 najlepszych rozpraw doktorskich naukowych na temat „Glycosidic bonds”.

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1

Baker, Anne. "The chemo-enzymatic synthesis of glycosidic bonds." Thesis, University of Exeter, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294484.

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2

Webberley, Matthew Christian. "The stereospecific synthesis of glycosidic bonds using glycosidases." Thesis, University of Exeter, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303771.

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Henderson, Margaret Esther. "Mechanisms of alkaline glycosidic bond cleavage in 1,5-anhydro-4-O-." Diss., Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/5744.

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4

Deshpande, Sagar Nandkumar. "Pre-hydrolysis of the Phenyl Glycosidic Bond in a Model Compound." Fogler Library, University of Maine, 2008. http://www.library.umaine.edu/theses/pdf/DeshpandeSN2008.pdf.

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Tennant-Eyles, Richard J. "Peptide templated oligosaccharide synthesis : a novel strategy for glycosidic bond formation." Thesis, University of Oxford, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365751.

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6

Collins, James P. "Prebiotic Synthesis of Pyrimidine Nucleosides." Thesis, Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/14095.

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The problem of forming a glycosidic bond between ribose and the free nucleoside bases to produce beta-nucleosides under plausible prebiotic conditions is commonly referred to in origin of life research as The Nucleoside Problem. The lack of a general solution to this problem currently represents one of the largest stumbling blocks to the RNA world hypothesis and many other theories regarding the origin of life. Over thirty years ago the purine nucleosides were successfully synthesized by drying the fully-formed bases and ribose together in the presence of divalent metal ion salts. However, gly

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7

Molinarolo, William E. "The high temperature alkaline degradation of phenyl β-D-glucopyranoside". Diss., Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/5753.

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8

Callam, Christopher Stephen. "Experimental and Theoretical Studies of: Methyl 4a-carba-D-arabinofuranosides and 2,3-Anydrosugars in Glycoside Bond Synthesis." The Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=osu1048691172.

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9

Mendoza, Muñoz María Fernanda. "Estudios teóricos y computacionales para la síntesis enzimática del enlace glicosídico." Doctoral thesis, Universitat Autònoma de Barcelona, 2016. http://hdl.handle.net/10803/400072.

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En esta tesis se ha investigado el mecanismo catalítico de las glicosiltransferasas que retienen la configuración a través de simulaciones híbridas de mecánica cuántica/mecánica molecular (QM/MM) y dinámicas moleculares (MD). La investigación se centra en la evaluación de las propuestas mecanísticas, además de la identificación de los principales factores que contribuyen a la eficiencia catalítica. Para esto usamos dos enzimas, α1,4-N-Acetilhexosaminiltransferasa (EXTL2) y Glucosil-3-fosfoglicerato Sintasa (GpgS) de Mycobacterium Tuberculosis. Además, se llevaron a cabo simulaciones adicionale

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10

Bruneau, Alexandre. "Développement de nouvelles réactions métallo-catalysées pour la création de liaisons C-C et C-hétéroatomes : Application à la synthèse d’inhibiteurs de la Hsp90 et aux ligands de la lectine A." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS138.

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Les travaux rapportés dans ce mémoire concernent le développement de nouvelles réactions métallo-catalysées pour la création de liaison carbone-hétéroatome et carbone-carbone ainsi que leurs applications à la synthèse de produits biologiquement actifs. La première partie de ce manuscrit est consacrée à l'étude de la réactivité des sucres dans les couplages organométalliques. Des conditions ont été développées pour la création de la liaison C-S entre glycosyl thiols et partenaires arylés. De plus, la création de la liaison carbone azote de glycosyl amines avec des acides boroniques a été étudié

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11

Bean, Heather D. "Prebiotic synthesis of nucleic acids." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/28259.

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Thesis (M. S.)--Chemistry and Biochemistry, Georgia Institute of Technology, 2008.<br>Committee Chair: Hud, Nicholas V.; Committee Member: Fox, Ronald F.; Committee Member: Lynn, David G.; Committee Member: Powers, James C.; Committee Member: Wartell, Roger M.; Committee Member: Williams, Loren D.

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12

Cornu, Agnès. "Synthèse et biosynthèse de composés modèles de complexes lignine-polysaccharides." Grenoble 1, 1989. http://www.theses.fr/1989GRE10051.

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L'etude des complexes du titre a ete envisagee selon deux approches: a) la premiere correspond a la synthese de composes mixtes modeles, avec differentes aglycones mono ou dimeriques, correspondant a des liaisons glycosidiques et a des liaisons ether benzylique. La sensibilite de ces liaisons vis-a-vis de l'oxydation a ete testee. B) la seconde est une etude biochimique. On prepare des polymeres a base d'alcool coniferylique a l'aide d'un extrait brut enzymatique en presence d'hydrates de carbone (polysaccharides ou nucleotides-oses) pour obtenir in vitro les complexes recherches

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13

Ouairy, Cécile. "Synthèse de nouveaux glycoimidazoles, inhibiteurs potentiels de glycosidases : préparation et utilisation en synthèse de glutaconaldéhydes oxydés en position 2 et de N-acylaminopentadiénals." Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00750565.

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La première partie de ce manuscrit est consacrée à l'inhibition des glycosidases. Ces enzymes sont impliquées dans de très nombreux processus biologiques et, par voie de conséquence, dans de nombreuses maladies (diabète, cancer, maldadies lysosomales etc...). Outre l'intérêt de développer de nouveaux médicaments, les glycosides hydrolases font aussi figure de cibles de choix pour étudier les itinéraires conformationnels au cours de l'hydrolyse de la liaison glycosidique et en particulier au niveau de l'état de transition. La mise en parallèle de l'importance de l'orientation des liaisons C2-O2

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14

Lee, Seung Seo. "Mechanism of glycoside hydrolase family 31 : mechanistic plasticity of glycosidic bond cleavage." Thesis, 2004. http://hdl.handle.net/2429/15979.

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Glycoside hydrolase. (GH) family 31 contains enzymes that catalyze several different reactions on glycosides. These include a nucleophilic substitution reactions with net retention of stereochemistry, common to retaining glycosidases, as well as an unusual β-elimination reaction. Since structures and mechanism are expected to be conserved in the same gene family, the two mechanisms were expected to feature common aspects. Three different GH family 31 enzymes were therefore studied. A double displacement mechanism for the retaining α-glucosidase from Aspergillus niger was shown via trapping of

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15

Daskhan, Gour Chand. "C-2 And C-4 Branched Carbohydrates : (i) Synthesis And Studies Of Oligosacchardes With Expanded Glycosidic Linkage At C-4; (ii) Synthesis Of 2-Deoxy-2-C-Alkyl Glycopyranosides." Thesis, 2012. http://etd.iisc.ernet.in/handle/2005/2462.

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16

Dey, Supriya. "Synthesis, Conformation and Glycosidic Bond Stabilities of Septanoside Sugars." Thesis, 2014. http://hdl.handle.net/2005/2898.

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Seven-membered cyclic sugars, namely, septanoses and septanosides, are less commonly known sugar homologues. Synthesis of septanoses arise an interest due to their configurational and conformational features and the attendant possibilities to explore their chemical and biological properties. Septanosides derivatives, mostly, deoxy-septanosides were synthesized, by many synthetic methodologies, such as, Knoevengal condensation, ring-closing metathesis, Bayer-Villeger oxidation and ring-expansion of 1,2-cyclopropanted glycals as key steps. Apart from septanosyl monosaccharides, septanoside con

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17

Sung, Ming-Ju, and 宋明儒. "Effects of glycosidic bond on the ozonolysis of disaccharides." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/04029993873742303865.

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碩士<br>國立臺灣大學<br>食品科技研究所<br>91<br>Four different disaccharides, maltose, trehalose, cellobiose, and chitobiose were used to study the effect of glycosidic bond, α-1, 4, α-1, 1, β-1, 4 on the ozonolysis of disaccharides. The yields of monosaccharides from maltose and cellobiose were similar. That indicated theαorβ form of glycosidic bond did not contribute the difference in ozonolysis. The yield of monosaccharides from trehalose was higher than three from both maltose and cellobiose. The data indicated thatα-1, 1 of glycosidic bond was more favorable during ozonolysis.Chitobiose yield

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18

Liang, Chien-Fu, та 梁健夫. "Synthesis of Oligosialic Acids via Exclusive α S-Glycosidic Bond Fromation". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/88633395019214966491.

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博士<br>國立清華大學<br>化學系<br>97<br>摘要自然界存在之聚唾液酸醣苷鍵形式主要有三種，α(2→8)與α(2→9)醣鍵結形式，以及α(2→8)/ α(2→9)醣鍵結交錯出現形式。最近在醣生物學研究上指出，出現在細胞表面的α(2→8)和α(2→9) 醣鍵形式的雙醣及寡醣在生物方面上扮演重要的角色。然而這些醣類在溫和的酸性或鹼性條件下是不穩定的，而且容易被醣水解酶影響而水解。因此，硫鍵結之醣苷分子已經被提出用來增強被化學或酵素水解之醣苷鍵結的穩定度。本論文的目標是發展便利的策略來合成硫鍵結之唾液酸寡糖抗原。我們發展了一個不對稱的異丁基雙硫鍵來當作變旋異位性(anomeric)硫原子的保護基，並利用此新方法來合成硫鍵結α(2→9)唾液酸寡糖。比較一般傳統在唾液酸變旋異位性硫原子的保護基，我們所使用的不對稱異丁基雙硫鍵保護基能夠承受在官能基轉換過程中而不會產生不飽和鍵的脫去產物。此外，不對稱異丁基雙硫鍵保護基可以有效率的去保護而在變旋異位中心產生具有硫醇的親核試劑，並且不會造成變旋異位中心的變旋異構化。我們實驗室藉由這個方法已經成功合成了4-,6-,8-硫鍵結α(2→9)唾液酸寡糖。除此之外，藉由硫親核反應來發展合成硫鍵結之α(2→8)以及α(2→8)/α(2→9)三醣體，這些方法包含利用C2-硫基化之唾液酸醣苷分子當做親核試劑以及C8-碘基化之唾液酸醣

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19

Maiti, Krishnagopal. "Synthesis, Structural and Biophysical Studies of Oligosaccharide Glycolipids and Glycosidic Bond Expanded Cyclic Oligosaccharides." Thesis, 2016. http://hdl.handle.net/2005/3117.

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Pathogenesis originating from mycobacterial invasion on host cells is prevalent and is a major challenge in efforts towards overcoming the burden of mycobacterial diseases. Complex architecture of mycobacterium cell wall includes an assortment of glycolipids, phospholipids, glycopeptidolipids (GPLs), peptidoglycans, arabinogalactans, lipoarabinomannans and mycolic acid. Aided by thick cell wall envelope, mycobacteria are known to survive in hostile environment. As most antibiotics target the log phase of the bacteria, bacterial survival is also largely dependent on its stationary phase. Mycoba

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