Neural correlates of enhanced working-memory performance in dissociative disorder: a functional MRI study.

De samenhang tussen somatische en psychische (dys)functie

Doppler cooling of Ca+ ions in a Penning trap

Published versio

Coherent matter wave inertial sensors for precision measurements in space

We analyze the advantages of using ultra-cold coherent sources of atoms for matter-wave interferometry in space. We present a proof-of-principle experiment that is based on an analysis of the results previously published in [Richard et al., Phys. Rev. Lett., 91, 010405 (2003)] from which we extract the ratio h/m for 87Rb. This measurement shows that a limitation in accuracy arises due to atomic interactions within the Bose-Einstein condensate

Models of quintessence coupled to the electromagnetic field and the cosmological evolution of alpha

We study the change of the effective fine structure constant in the cosmological models of a scalar field with a non-vanishing coupling to the electromagnetic field. Combining cosmological data and terrestrial observations we place empirical constraints on the size of the possible coupling and explore a large class of models that exhibit tracking behavior. The change of the fine structure constant implied by the quasar absorption spectra together with the requirement of tracking behavior impose a lower bound of the size of this coupling. Furthermore, the transition to the quintessence regime implies a narrow window for this coupling around $10^{-5}$ in units of the inverse Planck mass. We also propose a non-minimal coupling between electromagnetism and quintessence which has the effect of leading only to changes of alpha determined from atomic physics phenomena, but leaving no observable consequences through nuclear physics effects. In doing so we are able to reconcile the claimed cosmological evidence for a changing fine structure constant with the tight constraints emerging from the Oklo natural nuclear reactor.Comment: 13 pages, 10 figures, RevTex, new references adde

Genome-wide association for major depressive disorder: a possible role for the presynaptic protein piccolo

Major depressive disorder (MDD) is a common complex trait with enormous public health significance. As part of the Genetic Association Information Network initiative of the US Foundation for the National Institutes of Health, we conducted a genome-wide association study of 435 291 single nucleotide polymorphisms (SNPs) genotyped in 1738 MDD cases and 1802 controls selected to be at low liability for MDD. Of the top 200, 11 signals localized to a 167 kb region overlapping the gene piccolo (PCLO, whose protein product localizes to the cytomatrix of the presynaptic active zone and is important in monoaminergic neurotransmission in the brain) with P-values of 7.7 × 1

Weber and church governance: religious practice and economic activity

The debate about the relationship between religion and economic activity in the wake of Weber has been cast largely in terms of belief and values. This article suggests an alternative focus on practice. It argues that taken for granted practices of church governance formed to-hand resources for the organization of economic activity. The argument is developed through an examination of the historical development of church governance practices in the Presbyterian Church of Scotland, with particular emphasis on the way in which theological belief gave rise to practices of accountability and record keeping. In turn such practices contributed to a ‘culture of organization’ which had implications for economic activity. A focus on governance practices can help to illuminate enduring patterns of difference in the organization of economic activity

Effects of soil redistribution on landscape patterns of organic carbon

Non-Peer ReviewedSoil organic carbon (SOC) is important to soil productivity and is an important part of the global carbon cycle. Soil redistribution within hummocky landscapes has also resulted in SOC redistribution. Soil loss estimates using 137Cs techniques and SOC levels were measured on a 7x7 grid with a 100m sampling interval on a quarter section approximately 30 km east of Saskatoon. The quarter section has been under crop-fallow management for at least 50 years. 137Cs and SOC were also measured on a 5x6 grid (25m sampling interval) at a nearby native site as a reference for soil loss calculations. At the cultivated site, 34 out of the 49 sampling points had experience net erosion since 137Cs fallout (1960), 13 out of the 49 points were depositional, while 137Cs levels at the remaining two points were close to reference levels. A net soil loss of 7 Mg ha-’ yr“ was calculated based on the mean 137Cs concentration of the entire quarter section. Soil loss displayed a landscape pattern with footslope elements being areas of deposition and shoulder, backslope and level elements being eroded. SOC patterns followed soil loss patterns with depositional areas (footslopes) having higher levels of SOC than eroded areas. SOC that is not mineralized is redistributed within the landscape and concentrated into a relatively small area. As as a result, SOC levels over most of the quarter have been decreased substantially, indicating that there may be potential to sequester carbon over a larger area if management practices are changed