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 74 for “"autocatalytic"”.
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Mechanistic studies on the asymmetry amplifying, autocatalytic Soai reaction
The autocatalytic, asymmetry-amplifying alkylation of pyrimidine-5-carbaldehydes with diisopropylzinc, crowned as the ‘Soai reaction’, occupies a venerable position in organic chemistry. The transformation is peerless in its efficiency for asymmetric autocatalysis and sensitivity to initial chiral …
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Autocatalytic closure and the evolution of cellular information processing networks
… abstractly regarded as subsets of collectively autocatalytic (i.e., organisationally closed) reaction networks. These closure properties would subsequently interact with the evolution and adaptation of CIPNs capable of distinct information processing abilities. This hypothesis is motivated by …
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Engineering Robust and Autocatalytic Architectures for Human Missions to Mars
… with a self-rescue capability, and potential for autocatalytic growth. A case study proposes a NASA-led, 36-crew, 10-year Mars mission, with broad participation from Artemis Accords member countries. The 27-year program, with an average annual cost of $3.1b peaking at $7b in the mid-2030's, fits …
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Autocatalytic mechanism and functional consequences of covalent heme attachment in CYP4B1
… that binds heme to CYP4B1, reveal a viable autocatalytic mechanism for its formation, and evaluate functional consequences on enzymatic activity and physical properties of this novel, structurally modified P450. The site of protein attachment in CYP4B1 was identified as Glu310 in the …
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Theory and Evolutionary Evidence of the Autocatalytic Oxygenation of Earth’s Surface Environment
Although molecular oxygen (O₂) is a major component of Earth’s atmosphere today and a key signature of life on this planet, we do not understand why and how Earth has evolved from the ancient oxygen-deficient world to the modern oxygen-rich environment, and whether a similar in-crease can be …
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Investigation of the autocatalytic Cu(II) reduction processes in the systems with natural polyhydroxylic compounds as ligands /
This work investigates polyols – glycerol and sucrose – as an alternative ligand for electroless copper plating systems with reducer formaldehyde. Natural polyols are environmentally friendly, easily bio-degradable materials, but has not been studied enough for suitability for copper plating …
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Lean Transformations in Supply Chain, the autocatalytic nature of lean principles, and tactics for implementing lean tools
… organization, this case is used to evaluate the Autocatalytic Nature of Lean Principles within the Supply Chain department. Concurrently, the dynamics involved with the interactions of personnel within the department are evaluated. As a Lean Transformation is so heavily dependent upon the …
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The development of autocatalytic structural materials for use in the sulfur-iodine process for the production of hydrogen
The Sulfur-Iodine Cycle for the thermochemical production of hydrogen offers many benefits to traditional methods of hydrogen production. As opposed to steam methane reforming - the most prevalent method of hydrogen production today - there are no carbon dioxide emissions. Compared to other methods …
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KINETICS OF THE METHYL-IODIDE CATALYZED AND AUTOCATALYZED ARBUZOV REARRANGEMENT (METHOXYPHOSPHONIUM, CONDUCTIVITY, PHOSPHORUS NMR)
… iodides. No significant contribution from the autocatalytic Arbuzov rearrangement: (UNFORMATTED TABLE FOLLOWS) ABP('+)(OMe)Me ABPOMe (--->) ABP(O)Me,(TABLE ENDS) was observed for these reactions. For all cases except methyl diethyl- phosphinite (A = B = Et), the rate determining step is the …
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Modeling of controlled-release drug delivery from autocatalytically degrading polymer microspheres
… and erosion and diffusive drug release with autocatalytic effects and nonconstant effective diffusivity of the drug. A mechanistic reaction-diffusion model with pore evolution coupled to hydrolysis and related to the effective diffusivity through hindered diffusion theory is proposed. …
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A Free Heme Perspective to Sickle Hemoglobin Polymerization
… M. We also found that heme release is autocatalytic and results from spectral determination of methemoglobin percentages over time indicate towards well known higher susceptibility of sickle hemoglobin to autoxidation as mechanism for the release. We propose a link between physiological …
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Inorganic Nanoparticle Nucleation on Polymer Matrices
… silver reduction process was determined to be an autocatalytic process: a period of slow, continuous nucleation followed by rapid, autocatalytic growth. The reaction kinetics for this autocatalytic process is also reported.;PAA was crosslinked both chemically and physically to 3 biopolymers; ELP, …
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Fate of Omega-3 Fatty Acids from Algae in Mozzarella Cheese
… DHA degradation in algal oil was modeled by an autocatalytic equation. The fate of DHA from algal oil in mozzarella cheese was also modeled by an autocatalytic equation. In an effort to prevent DHA degradation and oxidation, mixed tocopherols were added. The optimum combination of those tested …
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Front Propagation and Feedback in Convective Flow Fields
… the propagation of fronts, which consist of autocatalytic reaction fronts, fronts with feedback and pattern forming fronts in Rayleigh-Bénard convection. The velocity and geometry of fronts are quantified for fronts traveling through straight parallel convection rolls, spatiotemporally …
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Investigation of calcium orthophosphate chemical effects in a post-LOCA nuclear reactor containment
… of calcium, a metastable region, followed by an autocatalytic drop region, and a final stable concentration region. The prompt release of calcium determined by the fiberglass concentration determined the maximum calcium concentration reached and the time taken to reach the metastable position. …
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Thermal rheological analysis of cure process of epoxy prepreg
… process was simulated with the four-parameter autocatalytic model. Except in the late stage of cure reaction, the model agrees well with the experimental data, especially at high temperatures. To account for the effect of diffusion on the cure rate, a diffusion factor was introduced into the …
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Metalation of the Di- and Tri-Methoxybenzenes
… aromatic substitution reaction. This autocatalytic mode of ortho-metalation offers additional insight into the controversy regarding the participation of a dimer intermediate in the mechanism of the directed ortho-metalation reaction.
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Extending Highthroughput Technologies: The Automation of Mechanism Discovery Investigations into the mode and action of the thio-Michael Reaction
… to the product. The exact mode of this autocatalytic step is not clear at present, but is the subject of ongoing studies as is the generality of this new mechanistic insight into the Michael addition reaction.
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Fate and behaviour of metformin and its transformation product guanylurea in soil-water systems
… logarithmic, Quiroga-Rosales-Romero (QSR) and autocatalytic models), the QSR and autocatalytic models predicted the degradation profiles of GUA and MET, respectively, capturing the incomplete degradation of GUA and "autocatalytic" behaviour of MET. Soil incubation studies revealed a bi-phasic …
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