71 research outputs found
Surface metal-insulator transition in the Hubbard model
The correlation-driven metal-insulator (Mott) transition at a solid surface
is studied within the Hubbard model for a semi-infinite lattice by means of the
dynamical mean-field theory. The transition takes place at a unique critical
strength of the interaction. Depending on the surface geometry, the interaction
strength and the wave vector, we find one-electron excitations in the coherent
part of the surface-projected metallic spectrum which are confined to two
dimensions.Comment: LaTeX, 9 pages, 5 eps figures included, Phys. Rev. B (in press
Double Beta Decay: Historical Review of 75 Years of Research
Main achievements during 75 years of research on double beta decay have been
reviewed. The existing experimental data have been presented and the
capabilities of the next-generation detectors have been demonstrated.Comment: 25 pages, typos adde
Effect modification of air pollution on Urinary 8-Hydroxy-2'-Deoxyguanosine by genotypes: an application of the multiple testing procedure to identify significant SNP interactions
<p>Abstract</p> <p>Background</p> <p>Air pollution is associated with adverse human health, but mechanisms through which pollution exerts effects remain to be clarified. One suggested pathway is that pollution causes oxidative stress. If so, oxidative stress-related genotypes may modify the oxidative response defenses to pollution exposure.</p> <p>Methods</p> <p>We explored the potential pathway by examining whether an array of oxidative stress-related genes (twenty single nucleotide polymorphisms, SNPs in nine genes) modified associations of pollutants (organic carbon (OC), ozone and sulfate) with urinary 8-hydroxy-2-deoxygunosine (8-OHdG), a biomarker of oxidative stress among the 320 aging men. We used a Multiple Testing Procedure in R modified by our team to identify the significance of the candidate genes adjusting for <it>a priori </it>covariates.</p> <p>Results</p> <p>We found that glutathione S-tranferase P1 (GSTP1, rs1799811), M1 and catalase (rs2284367) and group-specific component (GC, rs2282679, rs1155563) significantly or marginally significantly modified effects of OC and/or sulfate with larger effects among those carrying the wild type of GSTP1<it/>, catalase, non-wild type of <it>GC </it>and the non-null of GSTM1.</p> <p>Conclusions</p> <p>Polymorphisms of oxidative stress-related genes modified effects of OC and/or sulfate on 8-OHdG, suggesting that effects of OC or sulfate on 8-OHdG and other endpoints may be through the oxidative stress pathway.</p
Exposure to sub-chronic and long-term particulate air pollution and heart rate variability in an elderly cohort: the Normative Aging Study
Volume and surface photoemission from tungsten. I. Calculation of band structure and emission spectra
Longitudinal active living research to address physical inactivity and sedentary behaviour in children in transition from preadolescence to adolescence
Changes in population susceptibility to heat and cold over time: assessing adaptation to climate change
The new chain barium 126 - cesium 126 /
"May 19, 1954."Includes bibliographical references (p. 17).Sponsored by U.S. Atomic Energy CommissionMode of access: Internet
Purification of milk for calcium and strontium with Dowex-50 resin /
Health and Biology Distribution."Issued August 12, 1954"Sponsored by U.S. Atomic Energy CommissionMode of access: Internet
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