Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 1115 for “"ester"”.
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Ribosome-catalyzed ester formation.
Massachusetts Institute of Technology. Dept. of Biology. Thesis. 1970. Ph.D.
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Synthesis of Resveratrol Ester Derivatives
<p>The goal of this research project was to synthesize derivatives of transresveratrol. In order for resveratrol to be activated and used by the body it needs to bind to Human Serum Albumin (HSA), a protein in blood plasma. The derivatives were synthesized to improve the ability of resveratrol to …
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Ester-Based Synthetic Information Oligomers
… modified DNA analogues, in which the phosphate diester units used for synthesis, the bases used for recognition, and the sugar backbones have all been replaced. These systems have been found to form stable duplexes, so it is clear that the precise structure of these three modules is not crucial …
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Ester bond formation in bacterial adhesins
… crosslinks was revealed in 2014 and featured an ester bond formed between the side chains of threonine and glutamine. This was reported in the surface protein Cpe0147 of another Gram-positive bacterium, Clostridium perfringens, and was the focus of this PhD project. Just like the isopeptide bond, …
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Bimolecular Reduction of Hindered Ester Vinylogs
Made available in DSpace on 2015-05-12T17:02:33Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 0013495.PDF: 4297772 bytes, checksum: c8858c1b3cf9a33aebfe0ff2e3a65439 (MD5) Previous issue date: 1955
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A study of Bentonite ester clays
Thesis (M.S.) Massachusetts Institute of Technology. Dept. of Chemical Engineering, 1947.
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Moisture diffusion through vinyl ester/clay nanocomposites
Moisture diffusion was studied through vinyl ester samples containing up to 5 wt% montmorillonite clay; two different kinds of clay surface treatments were employed to make the clay compatible with the vinyl ester resin. These nanocomposites were characterized using differential scanning …
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Regioselective Design of Polysaccharide Ester Graft Copolymers
… 2,3-di-O-acyl-6-O-MeOTr (2,3A-6MeOTr) cellulose esters through C6-OH tritylation and C2/C3-OH acylation in a sequential, one-pot manner. Subsequent treatment of 2,3A-6MeOTr cellulose esters with an acyl donor under acidic (yet mild) conditions generated a series of 2,3-di-O-A-6-O-B (2,3A-6B) …
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Processing of toughened cyanate ester matrix composites
… of recently developed toughened cyanate ester networks as candidate materials for high performance composite matrix applications. The resin investigated was a Bisphenol-A cyanate ester toughened with hydroxy functionalized phenolphthalein based amorphous poly(arylene ether sulfone). The …
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Compounds of Transition Metals With a Phosphite Ester
Made available in DSpace on 2014-12-05T19:37:33Z (GMT). No. of bitstreams: 1 6004009.pdf: 2920874 bytes, checksum: 33c294569d360fc18517cf0572aab9f1 (MD5) Previous issue date: 1960
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Dispersion of carbon nanotubes in vinyl ester polymer composites
… nanotubes (XD-CNTs) were dispersed in vinyl ester (VE) using an ultra-sonic probe at a fixed frequency. The power, amplitude, and mixing time parameters of sonication were correlated to the electrical and mechanical properties of the composite materials in order to optimize dispersion. The …
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Synthesis of Resveratrol Ester Derivatives Using Selective Enzymatic Hydrolysis.
<p>Resveratrol, a naturally derived stilbene, is an interesting compound mostly talked about recently because for its anti-cancer properties. Unfortunately it has some shortcomings due to its low bioavailability and low solubility in water. For this reason, my research is to overcome resveratrol's …
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Modelling studies of magnesium-dependent phosphate ester processing enzymes
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1996.
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Toughening of cyanate ester networks with reactive thermoplastic modifiers
Cyanate ester or triazine networks are attaining increasing importance as potential candidates for high temperature adhesives and composite matrices. Low toughness is a major drawback with most crosslinked thermosetting materials, including the cyanate ester networks. Considerable attention has …
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Synthesis, Characterization and Properties of Vinyl Ester Matrix Resins
Vinyl ester oligomers diluted with styrene are important matrix resins for thermosetting polymer composites. A major objective of this work has been to study the chemistry and kinetics of the cure reactions of vinyl ester resins at elevated curing temperatures, which are consistent with typical …
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Amide and Ester-Functionalized Humic Acid for Fuel Combustion Enhancement
… This dissertation investigated the amidation and esterification of humic acid molecules extracted from leonardite. The resulting change in the modified humic acid dispersibility in organic solvents and its potential usage as a fuel additive were evaluated. Butyl, hexyl, octyl, and decyl …
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Lignin-derived thermosetting vinyl ester resins for high performance applications
<p>Vinyl ester (VE) resins are utilized to produce polymer matrix composites for use in a wide range of applications due to possessing relatively high moduli, strengths, and glass transition temperatures while maintaining low weight and cost. VE resins often contain high concentrations of a …
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Syntheses, structures and properties of novel poly(amino ester)s
… and biocompatibility make poly(amino ester)s promising materials for biotechnology. But so far, the chemistry of poly(amino ester)s reported is very limited, especially in amine constitution. Hence novel kinds of poly(amino ester)s are desirable. In our works, firstly the mechanisms of …
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The synthesis of B-keto esters from lithium ester enolates
Thesis (M.S.)--Michigan State University. Department of Chemistry, 1971
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