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 30 for “"Chemical Reagents"”.
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Asymmetric reduction using enzymes and Chiral chemical reagents
… To complement the enzymic studies the chiral chemical reduction of dihydrofolic acid was investigated. The sepamtion of the C6 epimers was thus particularly important for the assessment of the efficiency of the chiral reagents. Two types were investigated a) borate complexes of β-amino …
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Investigation of the effect of the reagent suite in froth flotation of a Merensky ore
… in the ores are extracted through the aid of chemical reagents (activators, collectors, depressants, frothers, modifiers) which are added to the flotation circuits to facilitate the separation between these minerals and the undesired gangue minerals present in the ore. The process is made …
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Novel Strategy for the Synthesis of Allenes.
<p>Allenes are very important chemical reagents in organic synthesis. Due to their high reactivity, they have been extensively used to carry out a variety of unique and effective chemical transformations including but not limited to ionic and free radical additions and transition metal catalyzed …
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Biological and Chemical Oxidation of Sulfidic Minerals at Alkaline pH
… with the utilization of microorganisms and chemical reagents. Biooxidation is a hydrometallurgical oxidation method which can be a pre-treatment method for gold recovery. Iron- and sulfur-oxidizing microorganisms with varying physiological characteristics liberate sulfide matrices by using …
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Learning causal graphs under interventions and applications to single-cell biological data analysis
… regulatory networks can be intervened on using chemical reagents or gene deletions. The identifiability of causal DAGs under perfect interventions, which eliminate dependencies between targeted variables and their direct causes, has previously been studied. This thesis first extends these …
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Astroparticle physics with nuclear track detectors
… the passage of ionizing particles; by using some chemical reagents such passage can be make visible at optical microscopes.
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Texturization of soy protein via twin-screw extrusion
… 11S globulins. Protein solubility in different chemical reagents was measured to reveal the nature and extent of molecular interactions in the extruded soy protein.
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Development and evaluation of an acylating agent detector using surface acoustic wave devices
… Acoustic Wave (SAW) devices have been used for chemical analysis since 1978. While sensitive to mass changes occurring on their surfaces, they are not selective to the mass they will detect. Their use as chemical sensors requires the development of specificity for a vapor (or class of vapors) …
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Understanding Positional Information During Zebrafish Fin Regeneration
… zebrafish strains, and the use of various chemical reagents. Two stunning examples of positional information in the pectoral fin have been discovered. First is the region-specific defect in male pectoral fin regeneration governed by an androgen's influence on GSK3 activity. The second is …
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The role of volatile species in the softening of blast furnace burden.
… alkali metals on the softening behaviour of both chemical reagents and a commercial iron ore. High temperature observation of the cones was supplemented by optical and scanning electron microscopy after testing. The results showed that the softening behaviour of the ferrous constituents of the …
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Stability and bandwidth investigation of alternative structures for nanopore sensors
… preparation, long processing times and expensive chemical reagents. In or- der to realize the goal of $1000 genome sequencing, many alternative meth- ods are proposed. One of the most promising technologies among these is nanopore sequencing. Nanopore sequencing involves the threading of a DNA …
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RECYCLING OF PRECIOUS METALS FROM WASTE PRINTED CIRCUIT BOARDS VIA A COMBINATION OF PYRO AND HYDROMETALLURGICAL PROCESSES
… is the initial step, followed by leaching and chemical separation to further isolate and process the metals. The primary goal of this project was to extract precious metals (Au and Pd) from waste PCBs through various chemical reagents. First, transition metals, including Cu, Fe, Pb, Ni, Sn, and …
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Theoretical studies of proton-coupled electron transfer in interfacial and photochemical energy conversion processes
… that convert energy from and store energy in chemical bonds. Therefore, understanding and optimizing these reactions is critical to the efficient transduction of solar energy. Intrinsic to these technological reactions as well as those nature is the directed translocation of electrons and …
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Evaluation of X-ray Fluorescence Spectroscopy as a Tool for Element Analysis in Pea Seeds
… and does not produce waste and requires no chemical reagents.
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Azomethine-Containing Moieties for Simple and Degradable Conjugated Polymers
… that enables tuning of optical, electrochemical, and physical properties. However, many state-of-the-art polymers require synthetic protocols that use multiple arduous synthetic steps, harmful chemical reagents, and produce toxic byproducts. Additionally, the synthesized polymers are not …
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DNA Three-way Junctions as Scaffolds for Hybrid Catalysis
The industrial production of chemicals is one of the largest contributors to global greenhouse gas emissions. The principles of green chemistry outline a route to transform chemistry into a sustainable, environmentally benign sector. As part of this, the development of novel catalysts and new …
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An investigation into the relationship between electrochemical properties and flotation of sulphide minerals
… using xanthates as collectors and the electrochemical properties of the flotation system. It is well known that electrochemical mechanisms in flotation systems have a major influence on flotation since the reactions occurring at the mineral/solution interface are of critical importance in the …
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Extraction and recovery of valuable elements from Red Mud through biohydrometallurgy
… consists in alumina extraction from bauxite by chemical dissolution. The main waste produced through the Bayer process is called Red Mud (RM). RM might be environmentally dangerous due to its high alkalinity (the pH in fact ranges between 10 and 12.5) and the presence of toxic elements. …
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