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Physics

2003

Marquette University

Articles 1 - 5 of 5

Full-Text Articles in Physical Sciences and Mathematics

Substrate Specificity, Metal Binding Properties, And Spectroscopic Characterization Of The Dape-Encoded N-Succinyl-L,L-Diaminopimelic Acid Desuccinylase From Haemophilus Influenzae, David L. Bienvenue, Danuta M. Gilner, Ryan S. Davis, Brian Bennett, Richard C. Holz Sep 2003

Substrate Specificity, Metal Binding Properties, And Spectroscopic Characterization Of The Dape-Encoded N-Succinyl-L,L-Diaminopimelic Acid Desuccinylase From Haemophilus Influenzae, David L. Bienvenue, Danuta M. Gilner, Ryan S. Davis, Brian Bennett, Richard C. Holz

Physics Faculty Research and Publications

The catalytic and structural properties of divalent metal ion cofactor binding sites in the dapE-encoded N-succinyl-l,l-diaminopimelic acid desuccinylase (DapE) from Haemophilus influenzae were investigated. Co(II)-substituted DapE enzyme was 25% more active than the Zn(II)-loaded form of the enzyme. Interestingly, Mn(II) can activate DapE, but only to ∼20% of the Zn(II)-loaded enzyme. The order of the observed kcat values are Co(II) > Zn(II) > Cd(II) > Mn(II) >Ni(II) ∼ Cu(II) ∼ Mg(II). DapE was shown to only hydrolyze l,l-N-succinyl-diaminopimelic acid (l,l-SDAP) and was inactive toward d,l-, l,d-, and d,d-SDAP. DapE was also inactive toward several acetylated amino acids as …

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Mononuclear N3S(Thioether)-Ligated Copper(Ii) Methoxide Complexes: Synthesis, Characterization, And Hydrolytic Reactivity, Kyle J. Tubbs, Amy L. Fuller, Brian Bennett, Atta M. Arif, Lisa M. Berreau Aug 2003

Mononuclear N3S(Thioether)-Ligated Copper(Ii) Methoxide Complexes: Synthesis, Characterization, And Hydrolytic Reactivity, Kyle J. Tubbs, Amy L. Fuller, Brian Bennett, Atta M. Arif, Lisa M. Berreau

Physics Faculty Research and Publications

Mononuclear copper(II) methoxide complexes supported by N3S(thioether) chelate ligands having two internal hydrogen bond donors have been prepared, comprehensively characterized, and evaluated for hydrolytic reactivity.

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Localized Ferromagnetic Resonance In Inhomogeneous Thin Films, R. D. Mcmichael, D. J. Twisselmann, Andrew Kunz Jun 2003

Localized Ferromagnetic Resonance In Inhomogeneous Thin Films, R. D. Mcmichael, D. J. Twisselmann, Andrew Kunz

Physics Faculty Research and Publications

The effect of sample inhomogeneity on the ferromagnetic resonance linewidth is determined by diagonalization of a spin wave Hamiltonian for ferromagnetic thin films with inhomogeneities spanning a wide range of characteristic length scales. A model inhomogeneity is used that consist of size D grains and an anisotropy field Hp that varies randomly from grain to grain in a film with thickness d and magnetization Ms. The resulting linewidth agrees well with the two-magnon model for small inhomogeneity, HpD « πMsd. For large inhomogeneity, HpD » πMsd the precession …

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Eigen Modes And Ferromagnetic Resonance Line Width Of Inhomogeneous Thin Films, R. D. Mcmichael, Andrew Kunz, D. J. Twisselmann Mar 2003

Eigen Modes And Ferromagnetic Resonance Line Width Of Inhomogeneous Thin Films, R. D. Mcmichael, Andrew Kunz, D. J. Twisselmann

Physics Faculty Research and Publications

In this paper, we describe modeling of the effects of magnetic inhomogeneity on ferromagnetic resonance line width using eigen mode analyses of inhomogeneous thin magnetic films.

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Evaluation Of The Influence Of A Thioether Substituent On The Solid State And Solution Properties Of N3S-Ligated Copper(Ii) Complexes, Kyle J. Tubbs, Amy L. Fuller, Brian Bennett, Atta M. Arif, Magdalena Makowska-Grzyska, Lisa M. Berreau Jan 2003

Evaluation Of The Influence Of A Thioether Substituent On The Solid State And Solution Properties Of N3S-Ligated Copper(Ii) Complexes, Kyle J. Tubbs, Amy L. Fuller, Brian Bennett, Atta M. Arif, Magdalena Makowska-Grzyska, Lisa M. Berreau

Physics Faculty Research and Publications

Admixture of a N3S(thioether) ligand having two internal hydrogen bond donors (pbnpa: N-2-(phenylthio)ethyl-N,N-bis-((6-neopentylamino-2-pyridyl)methyl)amine; ebnpa: N-2-(ethylthio)ethyl-N,N-bis-((6-neopentylamino-2-pyridyl)methyl)amine) with equimolar amounts of Cu(ClO4)2·6H2O and NaX (X = Cl−, NCO−, or N3−) in CH3OH/H2O yielded the mononuclear Cu(II) derivatives [(pbnpa)Cu–Cl]ClO4 (1), [(ebnpa)Cu–Cl]ClO4 (2), [(pbnpa)Cu–NCO]ClO4 (3), [(ebnpa)Cu–NCO]ClO4 (4), [(pbnpa)Cu–N3]ClO4 (5), and [(ebnpa)Cu–N3]ClO4 (6). Each …

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