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Showing 1 to 13 of 13 for “"Acid-base chemistry"”.
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An Investigation of Malaysian Secondary School Students’ Mental Models of Acid-Base Chemistry
There are many studies in chemistry investigating students’ difficulties in understanding chemical bonding, particle nature of matter and others, but relatively few on acid-base chemistry. One approach for reducing students’ learning difficulties uses model-based science teaching, which involves …
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Evolution of (Beta/alpha)8 Barrels: Refinement of Enzymatic Efficiency for a New Ortho-Succinylbenzoate Synthase (Osbs) From a Promiscuous Progenitor
This work allowed a step-wise pathway of changing base pairs to be elucidated that illustrates that a minimal amount of mutations (four from wild-type to I19F/R24W/D297G) are necessary to develop a new function. Additionally, the "new" function of OSBS activity was achieved with changes to …
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Site-Selective Anion Exchange in a Palladophosphorane
… made which may entail the concept of hard-soft acid-base chemistry and the strength of the bonds involved.
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Establishing the environmental and economic benefits of applying advanced thermal hydrolysis to existing anaerobic digesters in the Western Cape, South Africa
… if an improved process could be created. The base case of maintaining existing conventional mesophilic anaerobic digestion (MAD) was compared against the case of retrofitting THP. This would increase capacity and improve final product quality. The site would become a regional sludge facility …
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Enzymatic Characterization Of The Ammonia Tunnel In Helicobacter Pylori Asp-Trnaasn/glu-Trnagln Amidotransferase
… mutants suggest that D185 serves as a general acid or base in ammonia delivery. These results are the first demonstration of acid/base chemistry within an ammonia tunnel. Finally, preliminary characterization of the predicted ammonia tunnel gate residues (K89 and E126 in the GatB subunit) …
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Stabilization of electron-deficient sulfur by neighboring sulfur and oxygen groups.
… [2.2.1] heptane-2-endo carboxylic acid exhibits neighboring group participation upon electrochemical oxidation. The degree of participation depends on the acid/base chemistry of the α-amino acid. The zwitterion shows the strongest neighboring group participation. Controlled …
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Ionic Liquids in the Chemical Valorisation of Pulps and in their Chemical Analyses
… overall aim of this thesis is to understand the chemistry of different types of ionic liquids (ILs) and their application in cellulose processing, as well as in the chemical analyses of pulp. ILs are applied either on their own or as electrolytes with dimethyl sulfoxide (DMSO) or gamma …
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The variation of the gas phase acidity of a cysteine residue in oligopeptides
<p>The altered acidities of amino acid residues in folded proteins can be used as a good indication for the diverse functions, stabilities as well as folding-unfolding states of the proteins. Previously, our group has investigated the gas phase acidities of a series of cysteine containing peptides …
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A modeling framework for characterizing root exudation-driven geochemical dynamics in the Critical Zone
… of such changes on soil health and water chemistry remain an open challenge, and the mechanisms that drive changes in solute chemistry and eventually stream water chemistry are not completely understood. Vegetation plays a central role in driving Critical Zone (CZ) hydrobiogeochemistry …
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Extension and verification of the PWM_SA model to incorporate SANI-specific bioprocesses using experimental data from the Hong Kong SANI saline sewage treatment pilot plant.
… (BSR). This model component employed COD-based kinetics to cap ture the removal of biodegradable COD and sulfate, with sewage sludge serving as the carbon source. The model structure includes three key components: (1) a COD-based i anaerobic hydrolysis kinetics module that simulates the …
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Hepatocellular Carcinoma Image-Guided Intervention: Quantitative Characterization of Reagents For Thermochemical Ablation
… cause of cancer death worldwide. TCA utilizes acid-base chemistry delivered simultaneously to induce local ablation when administered. When delivered via a mixing catheter placed directly into the tumor, acid (e.g., AcOH) and base (e.g., NaOH) react to completion at the catheter tip, producing …
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SIDEROPHORE DESFERRIOXAMINE B PROMOTED DISSOLUTION AND ADSORPTION PROPERTIES OF TITANIUM DIOXIDE BEARING MINERALS
… to Fe(III) and it is an even stronger Lewis acid than Fe(III). Therefore, it can interact strongly with bacterial siderophores by acid-base chemistry. Given the importance of TiO2 nanoparticles in everyday life and their unexplored biological roles, this research explores the dissolution of …
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Experimental evaluation of the effect of thermal heat and pressure pre-treatment on primary sludge anaerobic digestion
… characterization stoichiometry and weak acid base chemistry for both primary sludges and (iv) graphical comparison of measured data and anaerobic digestion model-predicted results. The effect of thermal heat and pressure (THP) pre-treatment on primary sludge degradability was evaluated. …