Do daily mood fluctuations activate ruminative thoughts as a mental habit?:Results from an ecological momentary assessment study

It has been suggested that mental habits may underpin a heightened disposition to engage in rumination in response to negative mood. The aim of the current study was to assess the role of habit in the dynamic interplay between affect and ruminative thinking in the flow of daily life experiences. Using mobile ecological momentary assessment, 97 participants recorded affect and rumination ten times daily over six days, after completing measures of trait ruminative brooding and habitual characteristics of negative thinking (e.g. automaticity, lack of conscious awareness, intent and control). Momentary fluctuations in negative (increased) and positive (decreased) affect was prospectively associated with greater rumination-levels at the next sampling occasion. The degree to which affect triggered a subsequent ruminative response was moderated by habitual characteristics of negative thinking in a theoretically consistent way. Stronger temporal pairing of negative affect and rumination was also associated with greater emotional inertia but less carry-over of rumination from one moment to the next. Depression vulnerability may be in the form of rumination being habitually triggered in response to momentary fluctuations in affect, with deleterious effect on mood. The findings may have clinical implications, as targeting the habitual nature of rumination might help reduce depression vulnerability

Aircraft-based observations and high-resolution simulations of an Icelandic dust storm

The first aircraft-based observations of an Icelandic dust storm are presented. The measurements were carried out over the ocean near Iceland's south coast in February 2007. This dust event occurred in conjunction with an easterly barrier jet of more than 30 m s<sup>−1</sup>. The aircraft measurements show high particle mass mixing ratios in an area of low wind speeds in the wake of Iceland near the coast, decreasing abruptly towards the jet. Simulations from the Weather Research and Forecasting Model coupled with Chemistry (WRF/Chem) indicate that the measured high mass mixing ratios and observed low visibility inside the wake are due to dust transported from Icelandic sand fields towards the ocean. This is confirmed by meteorological station data. Glacial outwash terrains located near the Mýrdalsjökull glacier are among simulated dust sources. Sea salt aerosols produced by the impact of strong winds on the ocean surface started to dominate as the aircraft flew away from Iceland into the jet. The present results support recent studies which suggest that Icelandic deserts should be considered as important dust sources in global and regional climate models

Simple Space-Time Symmetries: Generalizing Conformal Field Theory

We study simple space-time symmetry groups G which act on a space-time manifold M=G/H which admits a G-invariant global causal structure. We classify pairs (G,M) which share the following additional properties of conformal field theory: 1) The stability subgroup H of a point in M is the identity component of a parabolic subgroup of G, implying factorization H=MAN, where M generalizes Lorentz transformations, A dilatations, and N special conformal transformations. 2) special conformal transformations in N act trivially on tangent vectors to the space-time manifold M. The allowed simple Lie groups G are the universal coverings of SU(m,m), SO(2,D), Sp(l,R), SO*(4n) and E_7(-25) and H are particular maximal parabolic subgroups. They coincide with the groups of fractional linear transformations of Euklidean Jordan algebras whose use as generalizations of Minkowski space time was advocated by Gunaydin. All these groups G admit positive energy representations. It will also be shown that the classical conformal groups SO(2,D) are the only allowed groups which possess a time reflection automorphism; in all other cases space-time has an intrinsic chiral structure.Comment: 37 pages, 4 Table

Cardiac arrest in a teenager - a case report

Neðst á síðunni er hægt að nálgast greinina í heild sinni með því að smella á hlekkinn View/OpenCardiac arrest is rarely seen in children and teenagers. We present a 12-year old girl with cardiac arrest following myocardial infarction, that required prolonged cardiac massage and extracorporeal-membranous-oxygenation (ECMO). At coronary angiography the left main coronary artery (LMCA) was stented for a suspected coronary dissection. The contraction of the heart improved and the ECMO-treatment was discontinued a week later. The patient was discharged home, but six months later a coronary artery bypass surgery was performed for in-stent restenosis. Further work-up with computed tomography (CT) showed that the LMCA originated from the right aortic sinus instead of the the left one. This case demonstrates how life threatening myocardial infarction can be caused by coronary artery anomalies.Hjartastopp er sjaldgæft hjá börnum og unglingum. Lýst er 12 ára stúlku sem fór í hjartastopp eftir brátt hjartadrep þar sem beita varð langvarandi hjartahnoði og hjarta- og lungnavél til að bjarga lífi hennar. Við kransæðaþræðingu vaknaði grunur um flysjun í vinstri kransæðarstofni og var því komið fyrir kransæðastoðneti. Samdráttur hjartans lagaðist og var hjarta- og lungnavélin aftengd viku síðar. Hún útskrifaðist heim en hálfu ári síðar sást endurþrenging í stoðnetinu og var því gerð kransæðahjáveituaðgerð. Á tölvusneiðmyndum sást að um meðfæddan galla var að ræða þar sem vinstri kransæðarstofn átti upptök frá hægri ósæðarbolla í stað þess vinstra. Tilfellið sýnir að kransæðamissmíð getur valdið lífshættulegu hjartadrepi

Evidence for an attention bias toward disgust in contamination fear

Publisher Copyright: © The Author(s) 2019.Although attention biases are common in various anxiety disorders, there is no consensus yet regarding attentional bias in obsessive–compulsive disorder. We assessed attention bias toward images involving contamination and disgust using an emotional attentional blink paradigm in a sample of university students high (HCF) or low (LCF) in contamination fear. Neutral, general-threat-, contamination-, and disgust-related images (T1) were presented followed by a discrimination task (T2) 200, 500, or 800 ms later within a rapid serial visual presentation stream of 20 images. The HCF group was overall less accurate on the attentional blink task. Response accuracy differed by image type and lag in the two groups at the trend level and revealed a large drop in performance 200 ms following presentation of disgusting images in the HCF group. No such differences were observed at later lags in the task. There were increases in negative affect following the task for the HCF but not the LCF group, which were correlated with contamination fear scores. The results suggest that a disgust-related attention bias may be present at early stages of information processing in people with contamination fear.Peer reviewe

Temperature-driven selection on metabolic traits increases the strength of an algal-grazer interaction in naturally warmed streams

This is the author accepted manuscript. The final version is available from the publisher via the DOI in this record.Trophic interactions are important determinants of the structure and functioning of ecosystems. As the metabolism and consumption rates of ectotherms increase sharply with temperature, there are major concerns that global warming will increase the strength of trophic interactions, destabilizing food webs, and altering ecosystem structure and function. We used geothermally warmed streams that span an 11°C temperature gradient to investigate the interplay between temperature-driven selection on traits related to metabolism and resource acquisition, and the interaction strength between the keystone gastropod grazer, Radix balthica, and a common algal resource. Populations from a warm stream (~28°C) had higher maximal metabolic rates and optimal temperatures than their counterparts from a cold stream (~17°C). We found that metabolic rates of the population originating from the warmer stream were higher across all measurement temperatures. A reciprocal transplant experiment demonstrated that the interaction strengths between the grazer and its algal resource were highest for both populations when transplanted into the warm stream. In line with the thermal dependence of respiration, interaction strengths involving grazers from the warm stream were always higher than those with grazers from the cold stream. These results imply that increases in metabolism and resource consumption mediated by the direct, thermodynamic effects of higher temperatures on physiological rates are not mitigated by metabolic compensation in the long-term, and suggest that warming will increase the strength of algal-grazer interactions with likely knock-on effects for the biodiversity and productivity of aquatic ecosystems. This article is protected by copyright. All rights reserved.Leverhulme Trust Research , Grant/AwardNumber: RP G-2013-335; ERC-StG, Grant/Award Number : ERC-StG 67727