Variations in Depleted Uranium Sorption and Solubility with Depth in Arid Soils
- W. Johnson, B. Buck, H. Brogonia, A. Brock
- Geology
- 1 November 2004
This study examined the ability of alkaline desert soils to sorb depleted uranium (DU) as a function of soil horizon and assessed the solubility of corrosion and migration products from two DU…
The sorption of selenite on various cement formulations
- E. A. Johnson, M. Rudin, S. Steinberg, W. Johnson
- Chemistry
- 1 November 2000
Oral administration of naturally occurring coumarins leads to altered phase I and II enzyme activities and reduced DNA adduct formation by polycyclic aromatic hydrocarbons in various tissues of…
- H. Kleiner, S. Vulimiri, L. Miller, W. Johnson, C. P. Whitman, J. DiGiovanni
- Chemistry, BiologyCarcinogenesis
- 2001
The results suggest that imperatorin and isopimpinellin may have potential chemopreventive effects when administered in the diet.
Crystal structure of 4-oxalocrotonate tautomerase inactivated by 2-oxo-3-pentynoate at 2.4 A resolution: analysis and implications for the mechanism of inactivation and catalysis.
- A. Taylor, R. Czerwinski, W. Johnson, C. P. Whitman, M. Hackert
- Chemistry, BiologyBiochemistry
- 20 October 1998
The crystal structure of 4-oxalocrotonate tautomerase (4-OT) inactivated by the active site-directed irreversible inhibitor 2-oxo-3-pentynoate has been determined and a mechanism for the enzyme-catalyzed reaction is proposed.
Developing resilient ponderosa pine forests with mechanical thinning and prescribed fire in central Oregon's pumice region
- M. Busse, P. Cochran, Carol J. Shestak
- Biology
- 17 June 2009
Thinning served as an effective surrogate to fire for managing central Oregon forest vegetation and helped restore natural ecological function, according to a comparison of treatment combinations for two decades.
Design of composite SC walls to prevent perforation from missile impact
- Jakob C. Bruhl, A. Varma, W. Johnson
- Engineering, Materials Science
- 2015
Crystal structure of macrophage migration inhibitory factor complexed with (E)-2-fluoro-p-hydroxycinnamate at 1.8 A resolution: implications for enzymatic catalysis and inhibition.
- A. Taylor, W. Johnson, R. Czerwinski, H. Li, M. Hackert, C. P. Whitman
- Chemistry, BiologyBiochemistry
- 8 June 1999
A mechanism is proposed for the MIF-catalyzed tautomerization reaction and it is demonstrated that MIF processes the enol isomers more efficiently than the keto isomers primarily because of a decrease in Km.
The structure of the proline utilization a proline dehydrogenase domain inactivated by N-propargylglycine provides insight into conformational changes induced by substrate binding and flavin…
- D. Srivastava, Weidong Zhu, W. Johnson, C. P. Whitman, D. Becker, J. Tanner
- Biology, ChemistryBiochemistry
- 26 January 2010
It is shown that N-propargylglycine irreversibly inactivates PutA by covalently linking the flavin N(5) atom to the epsilon-amino of Lys329, and inactivation locks PutA into a conformation that may mimic the proline-reduced, membrane-associated form.
Kinetic and structural effects of mutations of the catalytic amino-terminal proline in 4-oxalocrotonate tautomerase.
- R. Czerwinski, W. Johnson, C. P. Whitman
- Biology, ChemistryBiochemistry
- 25 November 1997
It is concluded that the 2 order of magnitude decreases in kcat in the P1G and P1A mutants result from both a decrease in basicity and an increase in flexibility of the general base.
Corrosion of Depleted Uranium in an Arid Environment: Soil-Geomorphology, SEM/EDS, XRD, and Electron Microprobe Analyses
- B. Buck, A. Brock, W. Johnson, A. Ulery
- Geology, Environmental Science
- 1 November 2004
Corrosion of anthropogenic uranium in natural environments is not well understood, but is important for determining potential health risks and mobility in the environment. A site in the southwestern…
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