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 44 for “"chemical environments"”.
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Cellular strategies for chemotactic navigation in complex chemical environments
… exhibit directed movement in response to soluble chemicals in their vicinity - this phenomenon is commonly known as chemotaxis. Chemotactic cell migration is central to a variety of processes including embryogenesis, tissue development, wound healing and cancer metastasis [1, 2, 3, 4]. The key to …
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Exploiting plasmons to sense interfacial changes at the nanoscale
… provides insight into the mechanisms governing chemical reactions at interfaces and potential avenues for materials development. As a class of materials, plasmonic nanomaterials are a promising approach for probing chemistry at interfaces. When excited with an incident electric field like light, …
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Mutable mechanics in biomaterials : a study of trichocyte keratin and Nvjp-1 protein
… of their variable bond strengths in different chemical environments. Both bonds can act as an effective switch to stabilize or weaken a protein's geometry. These mechanisms are responsible for protein mutability, enabling distinct biological functions. Understanding the bonds' chemistry and …
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Multiphase flow and control of fluid path in microsystems
Miniaturized chemical-systems are expected to have advantages of handling, portability, cost, speed, reproducibility and safety. Control of fluid path in small channels between processes in a chemical/biological network is crucial for connecting process elements. We show complete separation of …
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Positronium formation in organic liquids and studies of micelle, liposome and polymer systems by position annihilation technique
… have found widespread applications in today's chemical industry. The micelle formation process was investigated in inverted micelles. A distinct cooperative effect of the solution resulting in abrupt changes in the number of thermal ortho-positronium atoms was observed and studied as a function …
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Scalable Model for Reaction Outcome Prediction and One-step Retrosynthesis with a Graph-to-Sequence Architecture
… passing neural network (DMPNN) captures local chemical environments, and the global attention encoder allows for long-range and intermolecular interactions, enhanced by graph-aware positional embedding. As an end-to-end architecture, Graph2SMILES can be used as a dropin replacement for the …
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The structural environments of cations adsorbed onto clays: A cesium-133 MAS NMR spectroscopic study
… hectorite occurs in several distinctly different chemical environments, and that motional averaging of Cs between some of these sites occurs above ${\sim}{-}40\sp\circ$C if water is present in the interlayer. Above ${\sim}{-}10\sp\circ$C, spectra for slurries of hectorite in CsCl solutions yield …
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New tools derived from the solvatochromic 4-N,N-dimethylamino-1,8-naphthalimide fluorophore for the detection of biomolecular interactions
… when considering applications in complex chemical environments like that of a living cell. Tradeoffs often exist between variables such as good extinction coefficients, suitable wavelengths of excitation and emission, thermal and photochemical stability, size, and others. Here in, we …
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Neutrophil Chemotaxis in Multiple Chemoattractant Gradients
… in which cells move in response to extracellular chemical gradients, plays a prominent role in the mammalian immune response. During this process, a number of chemical signals, called chemoattractants, are produced at or proximal to sites of infection and diffuse into the surrounding tissue. …
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Towards greener stationary phases : thermoresponsive and carbonaceous chromatographic supports
… which are sensitive towards external physical, chemical and electrical stimuli are termed as ‘intelligent materials’ and are widely used in medical and engineering applications. Presently, polymers which can undergo a physical change when heat is applied at a certain temperature (cloud point) in …
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Quantifying effects of substrata chemomechanical properties on eukaryotic and prokaryotic cell adhesion and morphology
… are capable of processing both mechanical and chemical signals from the extracellular environment. Exactly how these two factors affect the cell biology in the context of physiological circumstances is an area of intense interest that has given rise to an entire field of study called cell …
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Atomistic characterization of stress-driven configurational instability and its activation mechanisms
… under various non-uniform structural and/or chemical environments are characterized by systematically probing the atomistic potential energy landscape of each system using the state of the art configurational space sampling schemes. The problems studied are homogeneous dislocation nucleation …
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Durability of Chopped FiberReinforced Polymeric Composites for use in Experimental Automotive Fuel Cells
… to reduction in modulus, strength, and life in chemical environments has been well documented in the literature, especially at elevated temperatures. A chopped carbon fiber epoxy composite (Material A) and a chopped glass fiber epoxy composite (Material B) were exposed at 85°C to air, water, and …
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Synthesis and Study of Stimuli-Responsive Fluorescent Polymeric Thin Films for Early Corrosion Detection by Directly Monitoring Iron Dissolution from Steel Substrates
… selective to a variety of metal ion species and chemical environments (pH, polarity etc.). Our lab has adopted the use of fluorescence for evaluation and screening of coated substrates for early detection of corrosion in advance of serious metal visual and/or physical damage. The use of various …
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Volatile organic compound fluxes and mixing ratios in two contrasting atmospheric environments : London and the Amazon rainforest
… measurements of their fluxes from contrasting chemical environments. Additional measurements with greater spatial and temporal resolutions are required to constrain uncertainties in atmospheric chemistry and climate models. This thesis presents long-term measurements of VOC fluxes and …
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Decompositions of Free Energies in Molecular Simulation
… case the free energy is decomposed into local environments which reveal insights about the complex systems being studied. Free energy is a fundamental quantity that can be used to predict whether changes in state are physically favourable. This can be used to predict the solubility of molecules …
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Fundamentals and application of the collapse transition of poly(acrylic acid) for synthesis of various polymer-templated nanoparticles
… of the nanoparticle via UV crosslinking, further chemical reaction of the counterions can be performed. In principle, the method can be carried out with different polyelectrolyte-counterions pair, and hence has enormous potential for generating different kinds of nanoparticles. For each …
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Advances In The Electrodeposition Of Tantalum From Ionic Liquids In A Technical Plating Setup
… including high temperature and severe chemical environments. Application of a tantalum layer onto other metal substrates would be a beneficial corrosion-resistance technique. The method investigated for application of tantalum onto various metal substrates was via electrodeposition from …
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Photoemission and scanning tunneling microscopy investigation of elemental-semiconductor surfaces
… samples the number of atoms in each distinct chemical configuration can be determined. An adsorbate-induced chemical shift can be correlated with electronegativity differences between substrate and adsorbate atoms. In particular, studies of noble-metal interfaces with the (100) faces of Si and …
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