Search Results - "Unkefer, C.J."

The biosynthesis of tabtoxinine-beta-lactam. Use of specifically 13C-labeled glucose and 13C NMR spectroscopy to identify its biosynthetic precursors by Unkefer, C.J., London, R.E., Durbin, R.D., Uchytil, T.F., Langston-Unkefer, P.J.

“…Tabtoxinine-beta-lactam, an irreversible inhibitor of glutamine synthetase is produced by several pathovars of Pseudomonas syringae. We have examined…”
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CN − Secondary Ions Form by Recombination as Demonstrated Using Multi-Isotope Mass Spectrometry of 13C- and 15N-Labeled Polyglycine by McMahon, G., Saint-Cyr, H. Francois, Lechene, C., Unkefer, C.J.

“…We have studied the mechanism of formation CN − secondary ions under Cs + primary ion bombardment. We have synthesized 13C and 15N labeled polyglycine samples…”
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First transition metal [eta][sup +2]-SiH[sub 4] complexes, cis-Mo([eta][sup +2]-SiH[sub 4])(CO)(R[sub 2]PC[sub 2]H[sub 4]PR[sub 2])[sub 2], and unprecedented tautomeric equilibrium between an [eta][sup +2]-silane complex and a hydridosilyl species. A model for methane coordination and activation by Luo, X.L., Kubas, G.J., Burns, C.J., Brian, J.C., Unkefer, C.J.

“…We have synthesized the first examples of transition metal [eta][sup +2]-SiH-[sub 4] complexes and obtained spectroscopic evidence for an unprecedented…”
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eta[sup 2-Coordination of Si-H [sigmabonds to transition-metal fragments that also bind [eta[sup 2-dihydrogen ligands and agostic C-H bonds. Synthesis and characterization of [eta[sup 2-silane complexes cis-Mo([eta[sup 2-H-SiHR[prime[sub 2)(CO)(R[sub 2PC[sub 2H[sub 4PR[sub 2)[sub 2 by Luo, Xiao-Lang, Kubas, G.J., Bryan, J.C., Burns, C.J., Unkefer, C.J.

“…To date, a substantial number of transition-metal [sigma] complexes containing [eta][sup 2]-silane ligands, [eta][sup 2]-H[sub 2] ligands, or agostic C-H bonds…”
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Poly(γ -glutamylcysteinyl)glycine: Its Role in Cadmium Resistance in Plant Cells by Jackson, Paul J., Unkefer, Clifford J., Doolen, Jane A., Watt, Ken, Robinson, Nigel J.

“…Angiosperms can be selected for the ability to grow in the presence of normally toxic concentrations of certain trace metal ions. Addition of Cd and Cu to…”
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The 5-O-beta-D-galactofuranosyl-containing glycopeptide from Penicillium charlesii [Fungi] by Unkefer C.J, Gander J.E

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Intestinal absorption and tissue distribution of [14C]pyrroloquinoline quinone in mice by Smidt, C R, Unkefer, C J, Houck, D R, Rucker, R B

“…Pyrroloquinoline quinone (PQQ) functions as a cofactor for prokaryotic oxidoreductases, such as methanol dehydrogenase and membrane-bound glucose…”
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Neutron structure and inelastic-neutron-scattering and theoretical studies of Mo(CO)(H[sub 2])[(C[sub 6]D[sub 5])[sub 2]PC[sub 2]H[sub 4]P(C[sub 6]D[sub 5])[sub 2]][sub 2][center dot]4. 5C[sub 6]D[sub 6], a complex with an extremely low barrier to H[sub 2] rotation. Implications on the reaction coordinate for H-H cleavage to dihydride by Kubas, G.J., Burns, C.J., Eckert, J., Johnson, S.W., Larson, A.C., Vergamini, P.J., Unkefer, C.J., Khalsa, G.R.K., Jackson, S.A., Eisenstein, O.

“…The synthesis and characterization of derivatives of Mo(CO)(R[sub 2]PC[sub 2]H[sub 4]PR[sub 2])[sub 2] (R = Et, i-Bu, Ph, Et-Ph) and their reactions with H[sub…”
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Molecular hydrogen complexes of the transition metals. 7. Kinetics and thermodynamics of the interconversion between dihydride and dihydrogen forms of W(CO) sub 3 (PR sub 3 ) sub 2 H sub 2 where R = isopropyl and cyclopentyl by Khalsa, G.R.K., Kubas, G.J., Unkefer, C.J., Van Der Sluys, L.S., Kubat-Martin, K.A.

“…Kinetic and thermodynamic parameters have been obtained for the equilibrium system H{sub 2}W(CO){sub 3}(PR{sub 3}){sub 2} {rightleftharpoons} W(CO){sub…”
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sup 13 C and sup 15 N nuclear magnetic resonance evidence of the ionization state of substrates bound to bovine dihydrofolate reductase by Selinsky, B.S., Perlman, M.E., London, R.E., Unkefer, C.J., Mitchell, J., Blakley, R.L.

“…The state of protonation of substrates bound to mammalian dihydrofolate reductase (DHFR) has significance for the mechanism of catalysis. To investigate this,…”
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The 5-O-beta-D-galactofuranosyl-containing glycopeptide from Penicillium charlesii. Carbon 13 nuclear magnetic resonance studies by Unkefer, C J, Gander, J E

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In vivo Determination of the Pyridine Nucleotide Reduction Charge by Carbon-13 Nuclear Magnetic Resonance Spectroscopy by Unkefer, Clifford J., Blazer, Richard M., London, Robert E.

“…An intracellular coenzyme has been observed by carbon-13 nuclear magnetic resonance spectroscopy. The pyridine nucleotides in Escherichia coli were…”
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Excretion and metabolism of 1-nitropyrene in rats after oral or intraperitoneal administration by Dutcher, J S, Sun, J D, Bechtold, W E, Unkefer, C J

“…Many nitro-substituted polycyclic aromatic hydrocarbons (NPAHs) have been identified as environmental pollutants and have been found to be mutagens and…”
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