Citations Only: Recent submissions
Now showing items 821-840 of 990
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Identification and characterization of the nudix hydrolase from the Archaeon, Methanococcus jannaschii, as a highly specific ADP-ribose pyrophosphatase
(The American Society for Biochemistry and Molecular Biology: Journal of Biological Chemistry, 1998-08-14)The MJ1149 gene from the Archaeon, Methanococcus jannaschii, has been cloned and expressed in Escherichia coli. The 19-kDa protein containing the Nudix box, GX5EX7REUXEEXGU, has been purified and identified as a highly ... -
Escherichia coli orf17 codes for a nucleoside triphosphate pyrophosphohydrolase member of the MutT family of proteins
(The American Society for Biochemistry and Molecular Biology: Journal of Biological Chemistry, 1996-10-04)The product of the Escherichia coli orf17 gene is a novel nucleoside triphosphate pyrophosphohydrolase with a preference for dATP over the other canonical (deoxy)nucleoside triphosphates, and it catalyzes the hydrolysis ... -
Structural characterization of an n-acetyl-2-aminofluorene (AAF) modified DNA oligomer by NMR, energy minimization, and molecular dynamics
(American Chemical Society: Biochemistry, 1993-03-16)An N-acetyl-2-aminofluorene (AAF) modified deoxyoligonucleotide duplex, d(Cl-C2-A3-C4-[AAF-G5]-C6-A7-C8-C9)-d(GlO-G1 l-T12-G13-C14-G 15-T16-G 17-G18), was studied by one- and twodimensional NMR spectroscopy. Eight of the ... -
Orf186 represents a new member of the nudix hydrolases, active on adenosine(5)triphospho(5)adenosine, ADP-ribose, and NADH
(The American Society for Biochemistry and Molecular Biology: Journal of Biological Chemistry, 1998-02-06)Orf186, a new member of the Nudix hydrolase family of genes, has been cloned and expressed, and the protein has been purified and identified as an enzyme highly specific for compounds of ADP. Its three major substrates are ... -
Studies on the ADP-ribose pyrophosphatase subfamily of the nudix hydrolases and tentative identification of trgB, a gene associated with tellurite resistance
(The American Society for Biochemistry and Molecular Biology: Journal of Biological Chemistry, 1999-11-05)Four Nudix hydrolase genes, ysa1 from Saccharomyces cerevisiae, orf209 from Escherichia coli, yqkg from Bacillus subtilis, and hi0398 from Hemophilus influenzae were amplified, cloned into an expression vector, and transformed ... -
Miscibility study of polymer blends by a novel phosphorescent quenching system
(The American Chemical Society: Polymer Preprints, 1999-08)New techniques, such as X-ray and neutron scattering, solid-state NMR, and fluorescence quenching, have attracted much research interest in probing miscibility of multicomponent polymer systems because of their capacity ... -
Atomic structure of the DNA repair [4Fe-4S] enzyme endonuclease III
(American Association for the Advancement of Science: Science, 1992-10-16)The crystal structure of the DNA repair enzyme endonuclease III, which recognizes and cleaves DNA at damaged bases, has been solved to 2.0 angstrom resolution with an R factor of 0.185. This iron-sulfur [4Fe-4S] enzyme is ... -
The polymerization of phenylacetylene in carbon tetrachloride in the presence of light-activated W(CO)6
(Wiley: Journal of Polymer Science Part A: Polymer Chemistry, 1989-12)A study of the apparent reaction rate constants of phenylacetylene polymerized in CCl4 in the presence of light-activated W(CO)6 and of the molecular weight of the resulting polymer indicates that the propagating centers ... -
Electron spin resonance study of radical formation in cis-poly(phenylacetylene)/ferric acetylacetonate-triethylaluminum (PPA/Fe-Al). 2. Results and interpretation
(The American Chemical Society: Macromolecules, 1990-04-19)The line-shape and saturation analysis for inhomogeneously broadened ESR spectra, developed in the previous paper, is used to study the change of the PPA/Fe-Al resonance signal with temperature and polymer aging. A mechanism ... -
Structural properties of tetracene films on Ag(111) investigated by SPA-LEED and TPD
(Elsevier: Surface Science, 2005-01-10)The adsorption of tetracene (Tc) on Ag(111) was investigated by high resolution LEED (SPA-LEED) and temperature programmed desorption (TPD). Two long-range ordered monolayer phases (a, b) were found after Tc evaporation ... -
Resolution and interpretation of the ESR spectra of polyphenylacetylene polymerized with ferric acetylacetonate and triethylaluminum.
(Elsevier: Synthetic Metals, 1987-01)Features characteristic of triphenylcyclohexadienyl radicals formed in backbone cyclization, and of Al/Fe interactions are reported. -
Electrochemical transformation of SWNT/Nafion composites
(The Electrochemical Society: Electrochemical and Solid State Letters, 2004-10-08)The electrochemical performance of single wall carbon nanotube (SWNT)/Nafion composite electrodes were studied in sulfuric acid solutions. Electrochemical oxidation of the highly dispersed SWNTs within the Nafion matrix ... -
Fuel cell applications of nanotube-metal supported catalysts
(Materials Research Society Proceedings Fall 2002: Materials for Fuel Cells and Fuel Processors, 2002-12-02)Novel carbon materials with nanometer dimensions are of potentially significant importance for a number of advanced technological applications. Within this report we describe the results for the electrochemical characterization ... -
Carbon nanotube anodes for lithium ion batteries
(Materials Research Society Proceedings Fall 2001: Making Functional Materials with Nanotubes, 2002)Highly purified single-wall carbon nanotubes (SWCNT) were investigated for use as an anode material for thin film lithium ion batteries. The high purity nanotubes were obtained through chemical refinement of soot generated ... -
Effects of adsorbed O2, H2, CO2 and H2O on the optical properites of pure and polymer encapsulated single walled carbon nanotubes
(American Physical Society: Annual APS March Meeting, 2002-03-18)We have measured the optical absorption spectra of single wall carbon nanotubes (SWCNTs) and SWCNT-polymer matrix samples at several temperatures and pressures. An in-situ cell was designed that allowed for heating of ... -
Investigation of the electronic structure of carbon single wall nanotube hybrid nanostructures
(Plasmonic Nano-imaging and Nanofabrication: Proceedings of the SPIE, 2005-08-03)The effects of protonation on the structure of the carbon single-walled nanotube (SWNT) polymer composites were studied by solid-state nuclear magnetic resonance (NMR) techniques and Raman spectroscopy. In addition, ... -
Assessing the hydrogen adsorption capacity of single-wall carbon nanotube / metal composites
(American Institute of Physics Conference Proceedings: Hydrogen in Materials and Vacuum Systems, 2003-07-11)Carefully controlled and calibrated experiments indicate a maximum capacity for adsorption of hydrogen on SWNTs is ~8 wt% under room temperature and pressure conditions. Samples displaying this maximum value were prepared ... -
Protonation of carbon single-walled nanotubes studied using 13C and 1H-13C cross polarization nuclear magnetic resonance and raman spectroscopies
(The American Chemical Society: Journal of the American Chemical Society, 2005-12-14)The reversible protonation of carbon single-walled nanotubes (SWNTs) in sulfuric acid and Nafion was investigated using solid-state nuclear magnetic resonance (NMR) and Raman spectroscopies. Magic-angle spinning (MAS) was ... -
Radicals of C7-polyolefin cobalt complexes: electrochemistry, reaction routes, and structure of a resulting dimer
(The American Chemical Society: Organometallics, 1986-07)The reduction and oxidation of several cyclopentadienyl (Cp) cobalt complexes with pi-bonded CTpolyolefin ligands have been studied by electrochemical methods. The cycloheptadienyl complex CpCo(n^5-C7H9)+ is reversibly ... -
Development and characterization of single wall carbon nanotube–Nafion composite actuators
(Elsevier: Materials Science and Engineering B, 2005-02-15)The development and characterization of thin film polymeric actuators has been performed for single wall carbon nanotube (SWNT)–Nafion composite systems. Previous work in our laboratory illustrated that incorporation of ...