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 25 for “"Chemical Transformation"”.
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Engineering polymeric hollow fiber membrane reactors for sustainable chemical transformation reactions
… production of pharmaceuticals, fine chemicals, and agrochemicals, as well as upgrading of biomass feedstocks. Immobilization of organocatalysts and metal nanoparticles on continuous-flow microreactors offers an efficient catalytic system that exploits and enhances the advantages of …
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Effect of soil amendments on the chemical transformation of arsenic and the microbial diversity in rice paddy microbiome
… the rice grain. In contrast, the application of chemical fertilizer is not sustainable and could lead to long-run problems. As such, it is hypothesized “do different fertilizers affect the rice paddy microbiome and influence arsenic biogeochemistry, arsenic speciation, methylation and ultimately …
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Case studies in the modeling and control of continuous pharmaceutical manufacturing processes
… themselves. Small molecules are synthesized chemically; i.e. by a series of key chemical transformation, work-up, and recovery steps. Larger molecules can be isolated from naturally occurring sources (i.e. humans, plants, or other microorganisms), or produced via recombinant hosts such as …
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Bioinspired Mo/W-Oxo Complexes: Synthesis and Reactivity Across Multiple Ligand Scaffolds
… enzymes carry out difficult oxidative transformations with remarkable efficiency and selectivity under mild conditions. Among these, the xanthine oxidoreductase family provides an important model for understanding how high-valent metal-oxo centers and sulfur- rich ligand environments …
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Synthesis and Biosynthesis of Polyketide Natural Products
… separate disciplines of a large and broad chemical spectrum, synthetic organic chemistry and biochemistry have found in the last two decades a fertile common ground in the area pertaining to the biosynthesis of natural products. Both disciplines remain indispensable in providing unique …
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New Sensing Modalities for Bacterial and Environmental Phenomena
… delivery methods such as electroporation and chemical transformation. The bacteria are immobilized in an optically clear alginate hydrogel which simulates the physical and chemical environment normally experienced by bacteria in a biofilm. Complementing the microfluidic cell culture work, …
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Part I: Strategies for the Synthesis of Monodisperse Polymers and Cyclic Polymers. Part II: Synthesis of Dipyrromethenes and Aza-dipyrromethenes from Aromatic Nitriles
… where polymers need to be separated based on chemical functionality. Part II is an introduction to dipyrromethene and aza-dipyrromethene dyes, along with common methods for their syntheses. It goes on to present a new synthesis of aza-dipyrromethene dyes, which provides an easy route to a …
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Investigation of ordered shell nanoparticles as catalytic platforms for organic synthesis
… to catalysis, in which the catalyst affects a chemical transformation without being consumed itself. In pursuit of control over local molecular structure, previous work has discovered a general, spontaneous ordering of long, aliphatic molecules on the surfaces of nanoparticles. This ordering …
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CHEMICAL BIOLOGY STRATEGIES FOR THE FORMATION AND CLEAVAGE OF CHEMICAL BONDS
… and better understanding of how specific chemical bonds can be either formed or broken gives chemical biologists opportunities to control and regulate these processes with high precision. Therefore, with growing importance of the field of chemical biology, expansion of the toolbox of …
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Biological response to 8-oxoguanine base released during DNA base excision repair
… MAPK cascade; 3) identified a chemical transformation of 8-oxo-Gua to a hydroperoxide-like form under physiological pH and oxygen atmosphere; and 4) determined 8-oxo-Gua-induced oxidative stress, which arises from the Rac1-Ras-NOX-PLA2-LO pathways, does not have a significant …
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Continental outflow of polluted air from the US to the North Atlantic and mercury chemical cycling in various atmospheric environments
… NASA DC-8 flight 13 during the Intercontinental Chemical Transport Experiment -- North America. This study found two interesting results. First, pollutants in the southeastern U.S. boundary layer were transported to the upper troposphere over the North Atlantic by vertical transport, which was …
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Activity and Stability Design Principles of Transition Metal Compounds for Decarbonization
… molecules and compounds into value-added fuels, chemicals, and materials with electricity converted from solar and wind energy using electrolyzers. Moreover, as such an approach stores energy from intermittent sources in chemical bonds, renewable electricity can be regenerated utilizing fuel …
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Toward Engineering Oxygenase Activity into the Electron Transfer Protein Azurin
… hydrogen peroxide, represents the first reported chemical transformation in ‘converted’ electron transfer protein. Furthermore, it is the first report of a synthetic sulfenic acid functionality within the context of a protein. The latter is an important contribution to the field of protein design, …
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Transformations in inorganic nanomaterials: role of defects, surfaces, and size
… our ability to investigate the properties and transformations of materials as they evolve in size from precise clusters akin to molecules to extended solids exhibiting bulk-like properties. In this thesis, we look at a how critical features of nanomaterials like size, shape, surface chemistry …
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Integrating photosystem II and electroactive bacteria with three-dimensional electrodes for semi-artificial photosynthesis
… way, solar energy is harvested and stored into chemical bonds to render it viable for transport and utilisation. Yet coordinating the interwoven processes therein in an efficient and orderly fashion poses profound challenges for synthetic chemistry. Biology wields plenty of …
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Bioorthogonal Functionalization of Elastin-like Polypeptides
… from these components is, in fact, limited. The chemical identity of these building blocks – with a particular focus herein on the twenty naturally-occurring amino acids – limits the scope and functionality of the recombinant materials we can produce. In order to functionalize these products, to …
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Development of small molecule probes for fluorescence and photoacoustic molecular imaging
… characterization and quantification of biochemical processes taking place at the molecular levels within intact living subjects. As such, it has become an indispensable tool for both basic research and biomedical applications. In particular, fluorescence imaging allows us to study molecular …
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Automating reaction development: hardware and software for fully-automated high-fidelity navigation of high-dimensional chemical reaction space
… variables - in other words, high-dimensional chemical space - simultaneously. Discrete reaction variables include factors like the catalyst, ligand, solvent, and other reagents that are used to effect a chemical transformation. Given a tensor capturing relevant information about each discrete …
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Porous Carbon Fiber Functionalization and Thermochemical Degradation of Polystyrene-based Plastics for Resource Recovery
This dissertation explores the chemical transformation of polyacrylonitrile (PAN)- and polystyrene (PS)-based polymers into sustainable functional materials and chemical products. The research is motivated by two global challenges: the increasing demand for rare earth elements (REEs) for high …
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