THE HIGH ENERGY GRIBOV: SOME RECOLLECTIONS. (open access)

THE HIGH ENERGY GRIBOV: SOME RECOLLECTIONS.

I describe through a few anecdotes, Gribov's work on the high energy limit of strong interactions.
Date: May 22, 2005
Creator: McLerran, L.
System: The UNT Digital Library
Atomistic Simulations of Grain Boundary Pinning in CuFe Alloys (open access)

Atomistic Simulations of Grain Boundary Pinning in CuFe Alloys

The authors apply a hybrid Monte Carlo-molecular dynamics code to the study of grain boundary motion upon annealing of pure Cu and Cu with low concentrations of Fe. The hybrid simulations account for segregation and precipitation of the low solubility Fe, together with curvature driven grain boundary motion. Grain boundaries in two different systems, a {Sigma}7+U-shaped half-loop grain and a nanocrystalline sample, were found to be pinned in the presence of Fe concentrations exceeding 3%.
Date: May 22, 2005
Creator: Zepeda-Ruiz, L A; Gilmer, G H; Sadigh, B; Caro, J A & Oppelstrup, T
System: The UNT Digital Library
A molecular ruler based on plasmon coupling of single gold andsilver nanoparticles (open access)

A molecular ruler based on plasmon coupling of single gold andsilver nanoparticles

Molecular rulers based on Foerster Resonance Energy Transfer (FRET) that report conformational changes and intramolecular distances of single biomolecules have helped to understand important biological processes. However, these rulers suffer from low and fluctuating signal intensities from single dyes and limited observation time due to photobleaching. The plasmon resonance in noble metal particles has been suggested as an alternative probe to overcome the limitations of organic fluorophores and the coupling of plasmons in nearby particles has been exploited to detect particle aggregation by a distinct color change in bulk experiments. Here we demonstrate that plasmon coupling can be used to monitor distances between single pairs of gold and silver nanoparticles. We use this effect to follow the directed assembly of gold and silver nanoparticle dimers in real time and to study the time dynamics of single DNA hybridization events. These ''plasmon rulers'' allowed us to continuously monitor separations of up to 70 nm for more than 3000 seconds. Single molecule in vitro studies of biological processes previously inaccessible with fluorescence based molecular rulers are enabled with plasmon rulers with extended time and distance range.
Date: May 22, 2005
Creator: Sonnichsen, Carsten; Reinhard, Bjorn M.; Liphardt, Jan & Alivisatos, A. Paul
System: The UNT Digital Library