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 58 for “"Carboxyl groups"”.
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Chemical modification of catalytically essential functional groups in the active site of papain
A new technique for conversion of carboxylic acids to carbinols under mild conditions has been developed. This technique requires first formation of enol esters by coupling N-ethyl-5-phenylisoxazolium3' -sulfonate with an appropriate carboxylic acid in acetonitrile, followed by reduction with a …
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Cation effects on the purple membrane of Halobacterium halobium
… other divalent cation binding sites involving carboxyl groups on the bacteriorhodopsin surface do not directly affect the color change. The intrinsic pK$\sb{\rm a}$ of the binding of the special divalent cation and of the color transition is at about pH 2. The events involve the exchange of one …
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Bioactive Cellulose Nanocrystal Reinforced 3D Printable Poly(epsilon-caprolactone) Nanocomposite for Bone Tissue Engineering
… the bioactivity of the surface functional groups, sulfate and carboxyl groups, respectively. PCL nanocomposites were prepared with different SO-CNC contents and the chemical/physical properties of the nanocomposites were analyzed. 3D porous scaffolds with fully interconnected pores and …
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Silica based immunoassays for a covalently attached antigen
… with 3-aminopropyltriethoxysilane. Amine groups on the modified slides and beads were used for carbodiimide mediated coupling to carboxyl groups on a peptide antigen. High surface concentrations of antigen were achieved. Antibody binding to the antigen-modified beads and slides was …
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Inhibition of Calcium Oxalate Monohydrate Crystallization Using Organic Growth Modifiers
… that increased number of hydroxyl and carboxyl groups play a crucial role in interacting with specific COM crystal surface. Designing effective inhibitors require a fundamental understanding of modifier-crystal interactions at the molecular level. Consequently, we have used in situ AFM …
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Optical Characterization of Ultrasmall, Hydrogen -Terminated and Carboxyl -Functionalized Silicon Nanoparticles in Aqueous Environments
… part, three central elements establish that the carboxyl-functionalized Si-np have excellent potential for use as a luminescent marker in aqueous systems. First, they are shown to be ultrasmall, with a diameter of ∼1 nm, comparable to that of common organic fluorophores. Second, they are …
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Physikochemische und biologische Charakterisierung von texturiertem Silikon als Grundlage für die Entwicklung eines Retina-Patchs
… with allylamine and functionalization with carboxyl groups are the only modification methods to hydrophilize TS longterm. The long-term stability of the hydrophilization through COOH-functionalization is only maintained under storing in water. Plasma treatment with oxygen plasma and anionic …
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Binding and transport of calcium by synthetic analogues of ionomycin
… of ionomycin (3), namely a series of f3-diketoco-carboxylic acids 4-6, 28-30 and 33-35, were achieved by consecutive alkylation of the dianion of 2,4-pentanedione (7) with appropriate bromides and subsequent oxidation of theP-diketo tau-alcohols. The transport of calcium across an organic barrier …
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Understanding and engineering molecular interactions and electronic transport at 2D materials interfaces
… from the degree of deprotonation of the carboxyl groups at the edge of GO sheets. At low pH, the carboxyl groups are protonated, such that the GO sheets become less hydrophilic and form suspended GO aggregates. The GO aggregates formed at lower pH are found to be surface active and do not …
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Extrusion performance and physicochemical characterization of texturized native and chemically modified whey proteins in carbohydrate-containing systems
… the reactivity of either the free amino or carboxyl groups of the protein, texturization and/or puffing of corn starch-based WPI-containing products can be controlled. An optimum between the presence of disulfide bonds and hydrophobic interactions to form a properly texturized product from …
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Hydration and activity studies of bovine skeletal muscle proteins and wheat gliadins by nuclear magnetic resonance
… water to myosin $A$ appears to involve primarily carboxyl groups at high pH and imidazolium or ammonium groups at low pH, with hydration being minimal at the isoelectric point (5.5). The molecular dynamics of hydration water and ions bound to myosin occurred on a time scale of tens of picoseconds. …
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PVDF-graphene conductive composite membrane and PVA-graphene conductive composite membrane preparation and application
… titration was used to determine the linkage of carboxyl groups on the surface of graphene sheet. Then pure PVDF membrane was trail-produced to investigate the best ratio of PVDF, plasticizer, and solvent. Results showed that PVDF amount should not be higher than 15% by weight. In addition, the …
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Preparation and applications of catalytic magnetic nanoparticles
… particles to carry strong [alpha]--nucleophilic groups, which are able to catalyze the decomposition reaction and can be recycled and reused.The amidoxime modified magnetic particles were prepared first. The original particles were synthesized with the two-step procedure to obtain average …
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Mixed Polysaccharide Esters for Amorphous Solid Dispersion Oral Drug Delivery Vehicles
… succinic and glutaric anhydride, to append ω-carboxyl groups to commercially available cellulose and cellulose ester substrates. We used scalable synthetic strategies and widely available and cheap reagents to show a proof-of-concept for the manufacturability of these different polymer …
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Molecular recognition : conformational memory and the macroscopic functional character of heteropolymer gels
… In our study, gels were synthesized to contain carboxyl groups that are incorporated either randomly, or by chemical imprinting using the template, Pb(MAAc)2 . After removing the guest molecule, we test adsorption of divalent molecules, lead (Pb+2), the original guest molecule, or calcium …
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Hydroxypropylation of lignin and lignin-like model compounds
… content, and lignin structure. Particularly, carboxyl groups of lignin resulted in high acidity and low homopolymerization rate. It was also found that molar substitution varied between zero and three and results from model compound study indicated that conjugated aliphatic hydroxyl and …
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Synthesis and Characterization of Pillared Graphene and Holey Graphene
… data confirmed the presence of polar groups such as hydroxyl and carboxyl groups on GO and rGO indicating that both GO and rGO were synthesized successfully. On IR analysis of the pillared graphenes synthesized using the three pillaring agents (maleoyl chloride, fumaryl chloride, …
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Computational modeling of melanin aggregation
… polymer composed of 5,6-dihydroxyindole-2-carboxylic acid (DHICA) and 5,6-dihydroxyindole (DHI) building blocks, of which DHICA is reported as the more abundant in natural eumelanin while DHI being more common in synthetic eumelanin. In this study, the focus is on the self-assembly of DHI …
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Metal-polymer nanoparticulate systems for externally-controlled delivery
… (Sulfo-NHS) to activate carboxyl groups on the surface of the polymer nanoparticles. TEM confirmed successful formation of the metal-polymer nanocomposites. Loading and release of a model therapeutic were done to assess the potential use of the polymer component of the …
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