Browsing Chemistry by Title
Now showing items 631-650 of 836
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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 ... -
Size-Specific ZrO₂ and HfₓZr₁₋ₓO₂ Nanoclusters and Their Magnetic and Nanodevice Applications
(University of Waterloo, 2024-01-22)Nanoclusters, generally defined as assemblies of a discrete number of atoms or molecules in the size range of 1-10 nm, have attracted a lot of attention due to their unique properties that bridge the gap between isolated ...