Browsing CHEM Faculty Scholarship by Title
Now showing items 237-256 of 493
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Introducing supramolecular interactions into robust bis(tetrabromocatecholate) chelated manganese(III) systems and biomimetic catalytic activity
(John Wiley & Sons, Inc., 2017-02-23)This report deals with the syntheses, structures, supramolecular interactions, and biomimetic catalytic activity of three new manganese(III) complexes (1-3) containing the tetrabromocatechol ligand. Three different amines ... -
Investigating photoinduced energy and electron transfer mechanisms in ferrocene-zinc porphyrin-boron dipyrrin-fullerene supramolecular construct
(American Chemical Society, 2014-03-16)Photoinduced energy (EnT) and electron transfer (ET) processes have been the driving force in the conversion of solar energy to electrical energy or fuels. Understanding the mechanism is vital in designing “antenna-reaction ... -
Investigation of abiotic degradation of tire cryogrinds
(Elsevier, 2022-01-05)The abundance of microplastics found in the environment is a major cause of concern. Tire tread particles containing additives such as curing accelerators and antioxidants, can be a major source of elastomer pollution in ... -
Investigation of intramolecular proton migration in a series of model, metal-cationized tripeptides using in situ generation of an isotope label
(John Wiley and Sons, 2006-01-01)In this study we used an isotope label, generated in situ, to investigate intramolecular proton migration or scrambling during formation of [b(2)+17+Li](+) products by collision-induced dissociation (CID) of Li(+)-cationized ... -
Investigation of the neutral loss of a full amino acid mass during collision-induced dissociation of the b(3)+ ion derived from a model peptide containing a 4-aminobutyric acid residue
(John Wiley and Sons, 2007-01-01)In a previous study we found that a dominant fragmentation pathway observed for collision-induced dissociation (CID) of b(3)+ derived from peptides with sequence AXAG, where X is gamma-aminobutyric acid (gammaAbu) or ... -
Investigations of acidity and nucleophilicity of diphenyldithiophosphinate ligands using theory and gas-phase dissociation reactions
(American Chemical Society, 2008-04-21)Diphenyldithiophosphinate (DTP) ligands modified with electron-withdrawing trifluoromethyl (TFM) substitutents are of high interest because they have demonstrated potential for exceptional separation of Am (3+) from ... -
Ion mobility separation of peptide isotopomers
(Springer International Publishing AG, 2016-05)Differential or field asymmetric waveform ion mobility spectrometry (FAIMS) operating at high electric fields fully resolves isotopic isomers for a peptide with labeled residues. The naturally present isotopes, alone and ... -
Ion mobility spectrometry of macromolecules with dipole alignment switchable by varying the gas pressure
(American Chemical Society, 2019-06-05)Since inception in the 1980s, differential or field asymmetric waveform ion mobility spectrometry (FAIMS) was implemented at or near the ambient gas pressure (AP). Recently, we developed FAIMS at 15-30 Torr within a mass ... -
Ion mobility spectrometry of superheated macromolecules at electric fields up to 500 Td
(American Chemical Society, 2021-08-23)Since its inception in 1980s, differential or field asymmetric waveform ion mobility spectrometry (FAIMS) has been implemented at or near ambient gas pressure. We recently developed FAIMS at 15–30 Torr with mass spectrometry ... -
Ionic inhibitors of human leukocyte elastase: pyridinium and phenyl carboxylate derivatives of 3-alkyl-N-hydroxysuccinimide
(John Wiley and Sons, 1990-10-01)A series of pyridinium and phenyl carboxylate derivatives of 3-alkyl-N-hydroxysuccinimide has been synthesized; the compounds have been shown to be highly effective, time-dependent inactivators of human leukocyte elastase. ... -
IRMPD and DFT study of the loss of water from protonated 2-hydroxynicotinic acid
(Elsevier, 2012-07-06)Collision-induced dissociation (CID) of protonated 2-hydroxynicotinic acid (2-OHNic) generates a dominant product ion through loss of 18 mass units, presumably the elimination of water. Subsequent isolation and storage of ... -
IRMPD spectroscopy b2 ions from protonated tripeptides with 4-aminomethyl benzoic acid residues
(Elsevier, 2012-02)Collision-induced dissociation (CID) of the peptide alanine-4-aminomethylbenzoic acid-glycine, A(AMBz)G generates a prominent b2 ion despite a previous report [E.R. Talaty, T.J. Cooper, S.M. Osburn, M.J. Van Stipdonk, ... -
IRMPD spectroscopy of anionic group II metal nitrate cluster ions
(Springer, 2009-05-01)Anionic group II metal nitrate clusters of the formula [M(2)(NO(3))(5)](-), where M(2) = Mg(2), MgCa, Ca(2), and Sr(2), are investigated by infrared multiple photon dissociation (IRMPD) spectroscopy to obtain vibrational ... -
Iron and cobalt complexes of 2,6-Diacetylpyridine-bis(R-thiosemicarbazone) (R=H, phenyl) showing unprecedented ligand deviation from planarity
(Elsevier, 2009-03-02)The syntheses, characterization, and single-crystal X-ray crystal structures are reported for four complexes of iron and cobalt with the pentadentate ligands, 2,6-diacetylpyridinebis(thiosemicarbazone) (H(2)L(1)) and ... -
Isotope labeling and theoretical study of the formation of a3* ions from protonated tetraglycine
(Springer, 2006-12-01)Extensive 13C, 15N, and 2H labeling of tetraglycine was used to investigate the b3+ --> a3* reaction during low-energy collision-induced dissociation (CID) in a quadrupole ion-trap mass spectrometer. The patterns observed ... -
Kinetic evidence for channeling of dopamine between monoamine transporter and membranous dopamine-beta-monooxygenase in chromaffin granule ghosts
(American Society for Biochemistry and Molecular Biology, 2004-04-09)The nature of coupling between the uptake and dopamine-beta-monooxygenase (DbetaM) catalyzed hydroxylation of dopamine (DA) was studied in bovine chromaffin granule ghosts. Initial rate and transient kinetics of DA uptake ... -
LacI-DNA-IPTG Loops: Equilibria among conformations by single-molecule FRET
(American Chemical Society, 2013-02-13)The E. coli Lac repressor (LacI) tetramer binds simultaneously to a promoter-proximal DNA binding site (operator) and an auxiliary operator, resulting in a DNA loop, which increases repression efficiency. Induction of the ... -
Latent isocynate derivatives useful for deactivating enzymes
(United States Patent and Trademark Office, 1990-05-29)Certain amino-acid derivatives are disclosed as effective inhibitors of human leukocyte elastase and therefore useful in preventing the imbalance of this proteolytic enzyme in vivo. The compounds specifically are derivatives ... -
Linear and differential ion mobility separations of middle-down proteoforms
(American Chemical Society, 2018)Comprehensive characterization of proteomes comprising the same proteins with distinct post-translational modifications (PTMs) is a staggering challenge. Many such proteoforms are isomers (localization variants) that require ...