68 research outputs found
1H-n.m.r. evaluation of the ferricytochrome c-cardiolipin interaction. Effect of superoxide radicals
Transient dust in warm debris disks - Detection of Fe-rich olivine grains
(Abridged) Debris disks trace remnant reservoirs of leftover planetesimals in
planetary systems. A handful of "warm" debris disks have been discovered in the
last years, where emission in excess starts in the mid-infrared. An interesting
subset within these warm debris disks are those where emission features are
detected in mid-IR spectra, which points towards the presence of warm
micron-sized dust grains. Given the ages of the host stars, the presence of
these grains is puzzling, and questions their origin and survival in time. This
study focuses on determining the mineralogy of the dust around 7 debris disks
with evidence for warm dust, based on Spitzer/IRS spectroscopic data, in order
to provide new insights into the origin of the dust grains. We present a new
radiative transfer code dedicated to SED modeling of optically thin disks. We
make use of this code on the SEDs of seven warm debris disks, in combination
with recent laboratory experiments on dust optical properties. We find that
most, if not all, debris disks in our sample are experiencing a transient
phase, suggesting a production of small dust grains on relatively short
timescales. From a mineralogical point of view, we find that enstatite grains
have small abundances compared to crystalline olivine grains. The main result
of our study is that we find evidences for Fe-rich crystalline olivine grains
(Fe / [Mg + Fe] ~ 0.2) for several debris disks. This finding contrasts with
studies of gas-rich protoplanetary disks. The presence of Fe-rich olivine
grains, and the overall differences between the mineralogy of dust in Class II
disks compared to debris disks suggest that the transient crystalline dust is
of a new generation. We discuss possible crystallization routes to explain our
results, and comment on the mechanisms that may be responsible for the
production of small dust grains
Blood lactate is a predictor of short-term mortality in patients with myocardial infarction complicated by heart failure but without cardiogenic shock
Ion microprobe discovery of Archaean and Early Proterozoic zircon xenocrysts in southwest Sweden
Comments and corrections to the Letter to the Editor, Meteoritics & Planetary Science, May 2014: "Impact controversies: Impact recognition criteria and related issues," and discussion of shock mineral melting at Maniitsoq and Vredefort
Cost of illness of adult diabetes mellitus underestimated if comorbidity is not considered
OBJECTIVE: To determine costs of illness for adult diabetes mellitus (DM), including complications caused by DM. DESIGN: A population-based multicentre cross- sectional study including an interview and a physical examination of patients identified as having DM. The patients' medical records were analysed regarding diagnoses and complications attributable to DM. SETTING: Eight health care centres of six primary care districts in Southern Sweden. SUBJECTS: 1677 adults aged 25+, cared for at the health care centres, entered the study. MAIN OUTCOME MEASURES: Utilization of health care and care from relatives and the municipality, absence of short- and long-term sickness, cost of illness. RESULTS: The average annual direct and indirect costs for an adult with DM were calculated to be 61 700 Swedish Kronor (SEK) or 2.5 times higher than earlier estimates. The incremental cost of DM was 34 100 SEK. The cost distribution was 28% for health care, 31% for the municipality and relatives and 41% lost productivity. CONCLUSIONS: Calculations for the cost of illness of DM are underestimated if comorbidity caused by DM is not considered. When DM-related complications are included to identify the actual burden of disease to society, the cost of illness as a result of DM in Sweden is substantially higher than previously estimated
Thermal structure and evolution of an Archean large hot orogen : Insights from the Tasiusarsuaq terrane, SW Greenland
The Tasiusarsuaq terrane represents an Archean continental upper plate that was assembled and thickened by a series of igneous and tectonic events between c. 2970 and 2700 Ma. A review of the available data combined with thermodynamic modelling and U-Pb titanite and zircon dating allows detailed insight into the processes of crustal growth during the Meso- and Neoarchean. Following the intrusion of the c. 2970–2950 Ma Fiskenæsset complex in an arc-type setting, the southern part of the Tasiusarsuaq terrane was intruded by an early TTG generation between c. 2920 and 2880 Ma to create the Bjørnesund block. Subsequently, from c. 2880 to 2830 Ma, TTG magmatism migrated to the Sermilik block in the central and northern part of the Tasiusarsuaq terrane, whereas monzogranite magmatism occurred in the south. We interpret this pattern of igneous activity to be a result of accretion of the Sermilik block to the Bjørnesund block and the formation of a new plate interface behind the accreted terrane. Fabrics related to this early accretionary stage are preserved in the prograde amphibolite facies (580–630 °C; 4–6 kbar) lithologies from the Bjørnesund block that have U-Pb titanite ages of c. 2820 Ma. Afterwards, ongoing southwards-directed subduction led to substantial thickening, manifested by high-pressure granulite facies metamorphism (870 °C, 9.0–9.2 kbar) and the intrusion of the c. 2805–2785 Ma Ilivertalik intrusive complex. Convergence and underthrusting by Eoarchean continental crust (Færingehavn terrane) at c. 2760 to 2720 Ma led to the extrusion of hot, ductile granulite nappes into the mid crust. At this time, large sections of the Tasiusarsuaq terrane underwent extensive amphibolite facies reworking, at conditions ranging from ~725 °C to 5.0–5.5 kbar in the central parts to 6.5–7 kbar and 700 °C in the north. These conditions lasted until the final collision of the terranes at 2720–2700 Ma. Collectively, our model describes the evolution of an Archean large hot orogen that is characterized by continuous convergence rather than intermittent subduction. In many respects, it resembles more recent large hot orogens such as the Grenville, including the accretion of terranes prior to collisional orogeny
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