Browsing Chemistry by Title
Now showing items 622-641 of 826
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The Saliva Exposome for Monitoring of Individuals’ Health Trajectories
(Environmental Health Perspectives - United States Federal Government, 2017-07-20)Background: There is increasing evidence that environmental, rather than genetic, factors are the major causes of most chronic diseases. By measuring entire classes of chemicals in archived biospecimens, exposome-wide ... -
Scanning Tunneling Microscopy of Electrically Driven Phase Transitions in a Charge Density Wave Material
(University of Waterloo, 2022-03-25)The 1T polytype of the van der Waals material TaS2, has been studied extensively as a strongly correlated system. Exhibiting several different charge density wave (CDW) states, the phase diagram of 1T-TaS2 has been explored ... -
Searching for a DNAzyme version of the leadzyme
(Springer, 2015-10-12)The leadzyme refers to a small ribozyme that cleaves a RNA substrate in the presence of Pb2+. In an optimized form, the enzyme strand contains only two unpaired nucleotides. Most RNA-cleaving DNAzymes are much longer. Two ... -
Selection and characterization of an aptamer to a thiazole orange derivative for use in a fluorescence-based biosensor
(University of Waterloo, 2023-08-18)Aptamers are short single-stranded DNA or RNA sequences that have been selected in vitro to have a high binding affinity to a specific target molecule. One class of aptamers can bind to small non-fluorescent molecules to ... -
A Selective Na+ Aptamer Dissected by Sensitized Tb3+ Luminescence
(Wiley, 2016-08-17)A previous study of two RNA-cleaving DNAzymes, NaA43 and Ce13d, revealed the possibility of a common Na+ aptamer motif. Because Na+ binding to DNA is a fundamental biochemical problem, the interaction between Ce13d and Na+ ... -
Selective Surface Chemistry of Bifunctional Carboxylic acid, Aldehyde and Alcohol on Si(100)2x1: Exploring Competition between Alkyl, Alkenyl, Carboxyl, Hydroxyl, and Carbonyl Groups in Surface Functionalization
(University of Waterloo, 2009-01-26)The dissociative adsorption of three carboxylic acids (acetic acid, propanoic acid, and acrylic acid), allyl alcohol, and allyl aldehyde on Si(100)2×1 at room temperature has been investigated by X-ray photoelectron ... -
Self-assembled gold nanochain based materials as building blocks to fabricate flexible devices and electrocatalysts
(University of Waterloo, 2021-08-25)1D metal nanostructures are being actively researched as a component in next-generation electronic devices and as highly efficient electrocatalysts. 1D gold nanomaterials can be designed by controlling the aspect ratio and ... -
Self-association of Oligoquinoline Foldamers Probed by Time-Resolved Fluorescence Anisotropy
(University of Waterloo, 2022-01-31)The self-associations of oligoquinoline-based foldamers (OPV-QₙA with n = 4, 8, 17, and 33) terminated at one end with a carboxylic acid (A) and at the other end with the fluorescent dye oligo(phenylene vinylene) (OPV) ... -
Self-healable and reversible liposome leakage by citrate-capped gold nanoparticles probing initial adsorption/desorption induced lipid phase transition
(Royal Society of Chemistry, 2015-10-14)We herein report that the adsorption/desorption of citrate-capped gold nanoparticles (AuNPs) transiently causes leakage in fluid phase DOPC liposomes, while the liposomes do not leak with AuNPs capped with mercaptopropionic ... -
Self-healing metal coordinated hydrogels using nucleotide ligands
(Royal Society of Chemistry, 2015-10-21)A supramolecular gel formed by coordination of Zn2+ with adenosine monophosphate (AMP) is reported. The adenine base, the monophosphate, and Zn2+ are all important for gel formation. Mechanically disrupted gels can re-form ... -
Semiquinone-Bridged bis-Dithiazolyls as Neutral Radical Conductors
(University of Waterloo, 2011-12-21)Radicals are potential building blocks to prepare conductive and magnetic materials. In order to achieve high conductivity, materials displaying a large bandwidth W and a low on-site Coulomb repulsion energy U must be ... -
Sensing Parts-per-Trillion Cd2+, Hg2+ and Pb2+ Collectively and Individually Using Phosphorothioate DNAzymes
(American Chemical Society, 2014-05-22)Cadmium, mercury, and lead are collectively banned by many countries and regions in electronic devices due to their extremely high toxicity. To date, no sensing method can detect them as a group and also individually with ... -
Separating and probing tautomers of protonated nucleobases using differential mobility spectrometry
(Elsevier, 2017-08-26)The protonated nucleobases (C+H)+, (T+H)+, (U+H)+, (A+H)+, and (G+H)+ are investigated in a combined experimental and computational study using differential mobility spectrometry (DMS), mass spectrometry, and electronic ... -
SHORT CHIRAL SYNTHESES OF MORPHINAN AND RELATED SYSTEMS
(University of Waterloo, 2008-02-20)Morphine and its derivatives continue to challenge the creativity of synthetic chemists. The aim of this research is to execute a short chiral synthesis of the morphinan system. Chirality is introduced via asymmetric ... -
Silicon-based Materials as Negative Electrodes for Li-ion Batteries
(University of Waterloo, 2014-05-02)Silicon is a promising negative electrode material for lithium-ion (Li-ion) batteries, with volumetric and gravimetric capacities much higher than those in current commercial batteries. Implementation of Si as a negative ... -
A Silver DNAzyme
(American Chemical Society, 2016-04-05)Silver is a very common heavy metal, and its detection is of significant analytical importance. DNAzymes are DNA-based catalysts; they typically recruit divalent and trivalent metal ions for catalysis. Herein, we report a ... -
Single White-Light-Emitting Nanostructures Based on Förster Resonance Energy Transfer: Development, Characterization and Applications
(University of Waterloo, 2015-01-19)Electric energy use associated with lighting reaches up to 3400 Terawatts hours and constitutes approximately 20 % of the world total electricity output per year. That in turn contributes to the release of at least 1900 ... -
Site Specific Surface Chemistry of Prototypical Amino Acid, Peptide and DNA Base Groups on Si(111)7x7
(University of Waterloo, 2012-04-24)The surface chemistry of glycine, glycylglycine, adenine and thymine on Si(111)7×7 are studied for the first time by X-ray photoelectron spectroscopy (XPS) and Scanning Tunneling Microscopy (STM) experimental techniques. ... -
Site-specific Chemistry of Sulfur-containing Amino Acids on Si(111)-√3×√3-Ag: Bioorganic Nanostructured Film Growth and Adsorbate-induced Metal Cluster Formation Governed by Surface Defects
(University of Waterloo, 2019-09-24)The interfacial interactions and film growth mechanisms of sulfur-containing amino acids on Si(111)-√3×√3-Ag are investigated by using x-ray photoelectron spectroscopy (XPS) and scanning tunneling microscopy (STM) at room ... -
Smart Polymeric Materials by Ring-Opening Metathesis Polymerization
(University of Waterloo, 2017-09-22)The aim of this Thesis work was to address the issue of microbial contamination inside fuel tanks. Microorganisms induce the chemical corrosion of airplane tank walls due to their production of organic acids. Biocide ...