Self-incompatibility (SI) is a genetic system that prevents self-fertilization in many Angiosperms. Although plants from the Brassicaceae family present an apparently unique SI system that is ancestral to the family, investigations at the S-locus responsible for SI have been mostly limited to two distinct lineages (Brassica and Arabidopsis-Capsella, respectively). Here, we investigated SI in a ...

Previous studies have shown that the hemodynamic response of the primary somatosensory cortex (SI) to electrical median nerve stimulation doubles in strength when the stimulus rate (SR) increases from 1 to 5 Hz. Here we investigated whether such sensitivity to SR is homogenous within the functionally different subareas of the SI cortex, and whether SR sensitivity would help discern area 3b amon...

In this study, we have performed nanoscale characterization of Si-clusters and Si-nanowires with a laser-assisted tomographic atom probe. Intrinsic and p-type silicon nanowires (SiNWs) are elaborated by chemical vapor deposition method using gold as catalyst, silane as silicon precursor, and diborane as dopant reactant. The concentration and distribution of impurity (gold) and dopant (boron) in...

The pair-correlation function applied to 3D Atom Probe reconstructed volumes has been used to study the influence of a pre-ageing treatment (363K) on the early stages of precipitation at 458K in an Al-Mg-Si 6016 alloy. Mg-Si short-range positive pair correlation (clustering) is shown to form after a pre-ageing treatment. The hetero-atomic clusters are thought to act as preferential nucleation s...

This thesis reports an ab initio study of the Ge(111)-5×5 reconstruction, which forms on top of a Si(111)-7×7 substrate. Detailed descriptions of the structural and electronic properties of this surface, obtained from density-functional calculations, are presented and analyzed. A study of In clusters on this surface is performed, and compared with recent experimental work on this system. The ef...

0021-9517/$ see front matter 2009 Elsevier Inc. A doi:10.1016/j.jcat.2009.10.015 * Corresponding author. Address: Goesmann 222, Amherst, MA 01003-9336, USA. Fax: +1 413 545 4490 E-mail addresses: [email protected] (V. Ag (G.W. Huber), [email protected] (W.C. Conner edu (S.M. Auerbach). We have performed embedded-cluster calculations using density functional theory to investigate mechan...