C. H. Park

Anomalously Large Gap Anisotropy in the a-b Plane of Bi2Sr2CaCu2O8+δ

Zhi‐Xun Shen, D. S. Dessau, B. O. Wells, David M. King et autres

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Chromate-Reducing Properties of Soluble Flavoproteins from Pseudomonas putida and Escherichia coli

David F. Ackerley, C. F. Gonzalez, C. H. Park, Robert C. Blake et autres

Cr(VI) (chromate) is a toxic, soluble environmental contaminant. Bacteria can reduce chromate to the insoluble and less toxic Cr(III), and thus chromate bioremediation is of interest. Genetic and protein engineering of suitable enzymes can improve bacterial bioremediation. Many bacterial enzymes catalyze one-electron …

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A Soluble Flavoprotein Contributes to Chromate Reduction and Tolerance by Pseudomonas putida

C. F. Gonzalez, David F. Ackerley, C. H. Park, Abdul Matin

Abstract As a consequence of its toxicity, the accumulation of chromate [Cr(VI)] in drinking water poses a serious risk to human health. Conventional approaches to groundwater remediation and the regeneration of potable water supplies are expensive and have, to date, been limited …

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Measurement of theb-quark fragmentation function in Z0 decays

Koya Abe, Kenji Abe, K. Abe, И. Адам et autres

We present a measurement of the b-quark inclusive fragmentation function in ${Z}^{0}$ decays using a novel kinematic B-hadron energy reconstruction technique. The measurement was performed using 350 000 hadronic ${Z}^{0}$ events recorded in the SLD experiment at SLAC between 1997 and 1998. …

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Purification to Homogeneity and Characterization of a Novel Pseudomonas putida Chromate Reductase

C. H. Park, M. Keyhan, Bruce W. Wielinga, Scott Fendorf et autres

Cr(VI) (chromate) is a widespread environmental contaminant. Bacterial chromate reductases can convert soluble and toxic chromate to the insoluble and less toxic Cr(III). Bioremediation can therefore be effective in removing chromate from the environment, especially if the bacterial propensity for such removal …

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The G‐protein FlhF has a role in polar flagellar placement and general stress response induction in Pseudomonas putida

Suada Pandža, Margot Baetens, C. H. Park, Timothy Au et autres

The flhF gene of Pseudomonas putida, which encodes a GTP-binding protein, is part of the flagellar-motility-chemotaxis operon. Its disruption leads to a random flagellar arrangement in the mutant (MK107) and loss of directional motility in contrast to the wild type, which has …

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Dominant Role of a Pseudogap in the Physics of the Colossal Magnetoresistive Oxides

D. S. Dessau, T. Saitoh, C. H. Park, Zexiang Shen et autres

We have performed direct electronic structure measurements of the colosssal magnetoresistive oxides using high energy resolution photoemission spectroscopy. A key result of these measurements is the discovery of a pseudogap which drastically supresses or completely removes the spectral weight (density of states) …

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Experimental Determination of the key Energy Scales in the Colossal Magnetoresistive Manganites

D. S. Dessau, T. Saitoh, C. H. Park, Zexiang Shen et autres

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Excitation Gap in the Normal State of Underdoped Bi 2 Sr 2 CaCu 2 O 8+ δ

A. G. Loeser, Zhi‐Xun Shen, D. S. Dessau, D. S. Marshall et autres

Angle-resolved photoemission experiments reveal evidence of an energy gap in the normal state excitation spectrum of the cuprate superconductor Bi2Sr2CaCu2O8+delta. This gap exists only in underdoped samples and closes around the doping level at which the superconducting transition temperature Tc is a …

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Unconventional Electronic Structure Evolution with Hole Doping in Bi2Sr2CaCu2O8+δ : Angle-Resolved Photoemission Results

D. S. Marshall, D. S. Dessau, A. G. Loeser, C. H. Park et autres

We report angle-resolved photoemission results on ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}{\mathrm{Ca}}_{1\ensuremath{-}x}{\mathrm{Dy}}_{x}{\mathrm{Cu}}_{2}{\mathrm{O}}_{8+\ensuremath{\delta}}$ and oxygen depleted ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}{\mathrm{CaCu}}_{2}{\mathrm{O}}_{8+\ensuremath{\delta}}$ investigating the electronic structure changes above ${T}_{c}$ in materials with hole doping levels ranging from insulating to slightly overdoped. Near optimal hole doping, the Fermi surface is large and consistent with …

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Electronic structure and the metal-insulator transition in NiS2−xSex

A. Y. Matsuura, Zhi‐Xun Shen, D. S. Dessau, C. H. Park et autres

We studied the metal-insulator transition in the $\mathrm{Ni}{\mathrm{S}}_{2\ensuremath{-}x}{\mathrm{Se}}_{x}$ system in $x=0$ and $x=0.5$ single crystals using angle-resolved photoemission. A narrow band, characteristic of many-body effects, develops near ${E}_{F}$ for $x=0.5$. This feature shifts away from ${E}_{F}$ at the transition temperature, a discontinuous …

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Observation of a Saddle-Point Singularity in Bi2(Sr0.97Pr0.03)2CuO6+δ and Its Implications for Normal and Superconducting State Properties

David M. King, Zhi‐Xun Shen, D. S. Dessau, D. S. Marshall et autres

We have mapped the Fermi surface (FS) of single-crystal $\mathrm{Bi}{({\mathrm{Sr}}_{0.97}{\mathrm{Pr}}_{0.03})}_{2}\mathrm{Cu}{\mathrm{O}}_{6+\ensuremath{\delta}}$ using angle-resolved photoemission. We find an extended saddle point at $\overline{M}$ which is located very close to or at the Fermi level. This agrees with earlier photoemission data from the cuprates which …

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