1,080 research outputs found
Multiple shells around G79.29+0.46 revealed from near-IR to millimeter data
Aiming to perform a study of the warm dust and gas in the luminous blue
variable star G79.29+0.46 and its associated nebula, we present infrared
Spitzer imaging and spectroscopy, and new CO J=2-->1 and 4-->3 maps obtained
with the IRAM 30m radio telescope and with the Submillimeter Telescope,
respectively. We have analyzed the nebula detecting multiple shells of dust and
gas connected to the star. Using Infrared Spectrograph-Spitzer spectra, we have
compared the properties of the central object, the nebula, and their
surroundings. These spectra show a rich variety of solid-state features
(amorphous silicates, polycyclic aromatic hydrocarbons, and CO2 ices) and
narrow emission lines, superimposed on a thermal continuum. We have also
analyzed the physical conditions of the nebula, which point to the existence of
a photo-dissociation region.Comment: Received by ApJ 2009 November 20, accepted for publication 2010
February 25, Published 2010 March 2
The Detection of Crystalline Silicates in Ultra-Luminous Infrared Galaxies
Silicates are an important component of interstellar dust and the structure
of these grains -- amorphous versus crystalline -- is sensitive to the local
physical conditions. We have studied the infrared spectra of a sample of
ultra-luminous infrared galaxies. Here, we report the discovery of weak, narrow
absorption features at 11, 16, 19, 23, and 28 microns, characteristic of
crystalline silicates, superimposed on the broad absorption bands at 10 and 18
microns due to amorphous silicates in a subset of this sample. These features
betray the presence of forsterite (Mg_2SiO_4), the magnesium-rich end member of
the olivines. Previously, crystalline silicates have only been observed in
circumstellar environments. The derived fraction of forsterite to amorphous
silicates is typically 0.1 in these ULIRGs. This is much larger than the upper
limit for this ratio in the interstellar medium of the Milky Way, 0.01. These
results suggest that the timescale for injection of crystalline silicates into
the ISM is short in a merger-driven starburst environment (e.g., as compared to
the total time to dissipate the gas), pointing towards massive stars as a
prominent source of crystalline silicates. Furthermore, amorphization due to
cosmic rays, which is thought to be of prime importance for the local ISM, lags
in vigorous starburst environments.Comment: 7 pages, 5 figures, accepted for publication in Ap
Mid-Infrared interferometry of dust around massive evolved stars
We report long-baseline interferometric measurements of circumstellar dust
around massive evolved stars with the MIDI instrument on the Very Large
Telescope Interferometer and provide spectrally dispersed visibilities in the
8-13 micron wavelength band. We also present diffraction-limited observations
at 10.7 micron on the Keck Telescope with baselines up to 8.7 m which explore
larger scale structure. We have resolved the dust shells around the late type
WC stars WR 106 and WR 95, and the enigmatic NaSt1 (formerly WR 122), suspected
to have recently evolved from a Luminous Blue Variable (LBV) stage. For AG Car,
the protoypical LBV in our sample, we marginally resolve structure close to the
star, distinct from the well-studied detached nebula. The dust shells around
the two WC stars show fairly constant size in the 8-13 micron MIDI band, with
gaussian half-widths of ~ 25 to 40 mas. The compact dust we detect around NaSt1
and AG Car favors recent or ongoing dust formation.
Using the measured visibilities, we build spherically symmetric radiative
transfer models of the WC dust shells which enable detailed comparison with
existing SED-based models. Our results indicate that the inner radii of the
shells are within a few tens of AU from the stars. In addition, our models
favor grain size distributions with large (~ 1 micron) dust grains. This
proximity of the inner dust to the hot central star emphasizes the difficulty
faced by current theories in forming dust in the hostile environment around WR
stars. Although we detect no direct evidence for binarity for these objects,
dust production in a colliding-wind interface in a binary system is a feasible
mechanism in WR systems under these conditions.Comment: 21 pages, 4 tables, 13 figures. Accepted for publication in the
Astrophysical Journa
From personalized exchange towards anonymous trade: A field experiment on the workings of the invisible hand
The experimental literature has shown the tendency for experimental trading markets to converge to neoclassical predictions. Yet, the extent to which theory explains the equilibrating forces in markets remains under-researched, especially in the developing world. We set up a laboratory in 94 villages in rural Sierra Leone to mimic a real market. In this laboratory market, average efficiency of the within-village treatment is somewhat lower than predicted by theory (and observed in different contexts), and markets do not fully converge to theoretical predictions across rounds of trading. We also find that trading with strangers reduces efficiency, and that anonymized trade within the village does not affect efficiency. This points to the importance of behavioral norms for trade. Intra-village social relationships or hierarchies, instead, appear less important as determinants of trade. This is confirmed by analysis of the trader-level data, showing that individual earnings in the experiment do not vary with one’s status or position in local networks.We thank N.W.O. 452-04-333, N.W.O. 451-14-001 and Cambridge Conservation Initiative (CCI 05/101005) for financial support.This is the author accepted manuscript. The final version is available from Elsevier via https://doi.org/10.1016/j.jebo.2016.10.01
Unconditional Transfers and Tropical Forest Conservation: Evidence from a Randomized Control Trial in Sierra Leone
Unconditional conservation payments are increasingly used by conservation non-governmental organizations to further their environmental objectives. One key objective in many conservation projects that use such unconditional payments schemes is the protection of tropical forest ecosystems in buffer zone areas around protected parks where the scope of instating mandatory restrictions is more limited. We use a randomized controlled trial to evaluate the impact of unconditional livelihood payments to local communities on land use outside a protected area – the Gola Rainforest National Park – which is a biodiversity hotspot on the border of Sierra Leone and Liberia. High resolution RapidEye satellite imagery from before and after the intervention was used to determine land use changes in treated and control villages. We find support for the hypothesis that unconditional payments, in this setting, increase land clearance in the short run. The study constitutes one of the first attempts to use evidence from a randomized control trial to evaluate the efficacy of conservation payments and provides insights for further research.Cambridge Conservation Initiative
International Initiative for Impact Evaluation (grant # TW1.1042)
NWO (#45-14-001 and #451-14-001
Renal Compression in Heart Failure The Renal Tamponade Hypothesis
Renal dysfunction is one of the strongest predictors of outcome in heart failure. Several studies have revealed that both reduced perfusion and increased congestion (and central venous pressure) contribute to worsening renal function in heart failure. This paper proposes a novel factor in the link between cardiac and renal dysfunction: "renal tamponade" or compression of renal structures caused by the limited space for expansion. This space can be limited either by the rigid renal capsule that encloses the renal interstitial tissue or by the layer of fat around the kidneys or by the peritoneal space exerting pressure on the retroperitoneal kidneys. Renal decapsulation in animal models of heart failure and acute renal ischemia has been shown effective in alleviating pressure-related injury within the kidney itself, thus supporting this concept and making it a potentially interesting novel treatment in heart failure. (J Am Coll Cardiol HF 2022;10:175-183) (c) 2022 The Authors. Published by Elsevier on behalf of the American College of Cardiology Foundation. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Rolofylline, an adenosine A1−receptor antagonist, in acute heart failure
Background:
Worsening renal function, which is associated with adverse outcomes, often develops
in patients with acute heart failure. Experimental and clinical studies suggest that
counterregulatory responses mediated by adenosine may be involved. We tested the
hypothesis that the use of rolofylline, an adenosine A1−receptor antagonist, would
improve dyspnea, reduce the risk of worsening renal function, and lead to a more
favorable clinical course in patients with acute heart failure.
Methods:
We conducted a multicenter, double-blind, placebo-controlled trial involving patients
hospitalized for acute heart failure with impaired renal function. Within 24 hours
after presentation, 2033 patients were randomly assigned, in a 2:1 ratio, to receive
daily intravenous rolofylline (30 mg) or placebo for up to 3 days. The primary end
point was treatment success, treatment failure, or no change in the patient’s clinical
condition; this end point was defined according to survival, heart-failure status,
and changes in renal function. Secondary end points were the post-treatment development
of persistent renal impairment and the 60-day rate of death or readmission
for cardiovascular or renal causes.
Results:
Rolofylline, as compared with placebo, did not provide a benefit with respect to the
primary end point (odds ratio, 0.92; 95% confidence interval, 0.78 to 1.09; P=0.35).
Persistent renal impairment developed in 15.0% of patients in the rolofylline group
and in 13.7% of patients in the placebo group (P=0.44). By 60 days, death or readmission
for cardiovascular or renal causes had occurred in similar proportions of patients
assigned to rolofylline and placebo (30.7% and 31.9%, respectively; P=0.86).
Adverse-event rates were similar overall; however, only patients in the rolofylline
group had seizures, a known potential adverse effect of A1-receptor antagonists.
Conclusions:
Rolofylline did not have a favorable effect with respect to the primary clinical composite
end point, nor did it improve renal function or 60-day outcomes. It does not
show promise in the treatment of acute heart failure with renal dysfunction. (Funded
by NovaCardia, a subsidiary of Merck; ClinicalTrials.gov numbers, NCT00328692
and NCT00354458.
A combined clinical and biomarker approach to predict diuretic response in acute heart failure
Background:
Poor diuretic response in acute heart failure is related to poor clinical outcome. The underlying mechanisms and pathophysiology behind diuretic resistance are incompletely understood. We evaluated a combined approach using clinical characteristics and biomarkers to predict diuretic response in acute heart failure (AHF).
Methods and results:
We investigated explanatory and predictive models for diuretic response—weight loss at day 4 per 40 mg of furosemide—in 974 patients with AHF included in the PROTECT trial. Biomarkers, addressing multiple pathophysiological pathways, were determined at baseline and after 24 h. An explanatory baseline biomarker model of a poor diuretic response included low potassium, chloride, hemoglobin, myeloperoxidase, and high blood urea nitrogen, albumin, triglycerides, ST2 and neutrophil gelatinase-associated lipocalin (r2 = 0.086). Diuretic response after 24 h (early diuretic response) was a strong predictor of diuretic response (β = 0.467, P < 0.001; r2 = 0.523). Addition of diuretic response after 24 h to biomarkers and clinical characteristics significantly improved the predictive model (r2 = 0.586, P < 0.001).
Conclusions:
Biomarkers indicate that diuretic unresponsiveness is associated with an atherosclerotic profile with abnormal renal function and electrolytes. However, predicting diuretic response is difficult and biomarkers have limited additive value. Patients at risk of poor diuretic response can be identified by measuring early diuretic response after 24 h
Dusty ring nebulae around new candidate Luminous Blue Variables
We report on the discovery of a further two ring nebulae in the Midcourse Space Experiment (MSX) Galactic Plane Survey; G24.73+0.69 and G26.47+0.02. Morphologically, both appear similar to the nebulae found around the Luminous Blue Variable (LBV) candidates G79.29+0.46 and Wra 17-96. A central, unresolved point source was identified in both cases-positional coincidence with the star StRS 237 was found for G26.47+0.02, while no optical counterpart could be identified for G24.73+0.69. However, subsequent near IR broadband imaging of the G24.73+0.69 field identified a very red-(J- K)~ 2 mag-stellar counterpart to the central object. Near-IR spectroscopy of both objects reveal rich emission line spectra dominated by H I, He I and low excitation metals, suggesting classification as luminous B supergiants and revealing a striking superficial similarity to the other MSX ring sources and known LBVs. We utilised a NLTE model atomsphere code to model the K band spectra and near-IR spectral energy distributions of the central stars in order to determine their physical parameters. Adopting a distance, d=5.2 kpc to G24.73+0.69 yields a temperature, T=12 kK, luminosity, log (L/L⊙)=5.6 and mass loss rate, Ṁ=1x10-5 M⊙ yr-1. G26.47+0.02 appears to be a more extreme object; adopting d=6.5 kpc results in T=17 kK, log (L/L⊙)=6.0 and Ṁ=9x10-5 M⊙ yr-1, placing it at the Humphreys-Davidson limit for massive stellar objects. Analysis of the spatially resolved mid-IR fluxes of both objects reveal extended periods of enhanced mass loss, resulting in comparatively low mass nebulae, with chemistries dominated by O-rich dust (with a population of small Fe grains existing co-spatially with the silicate dust). Comparison to the other MSX ring nebulae sources reveals a homogeneous group of objects, with both stellar and nebular properties consistent with known LBVs. With both spectroscopic and/or photometric variability observed for those sources with multiepoch observations, we propose a close affinity between both classes of object and suggest that long term monitoring of the MSX sources will reveal them to be bona fide LBVs
A network analysis to compare biomarker profiles in patients with and without diabetes mellitus in acute heart failure
Aims:
It is unclear whether distinct pathophysiological processes are present among patients with acute heart failure (AHF), with and without diabetes. Network analysis of biomarkers may identify correlative associations that reflect different pathophysiological pathways.
Methods and results:
We analysed a panel of 48 circulating biomarkers measured within 24 h of admission for AHF in a subset of patients enrolled in the PROTECT trial. In patients with and without diabetes, we performed a network analysis to identify correlations between measured biomarkers. Compared with patients without diabetes (n = 1111), those with diabetes (n = 922) had a higher prevalence of ischaemic heart disease and traditional coronary risk factors. After multivariable adjustment, patients with and without diabetes had significantly different levels of biomarkers across a spectrum of pathophysiological domains, including inflammation (TNFR-1a, periostin), cardiomyocyte stretch (BNP), angiogenesis (VEGFR, angiogenin), and renal function (NGAL, KIM-1) (adjusted P-value <0.05). Among patients with diabetes, network analysis revealed that periostin strongly clustered with C-reactive protein and interleukin-6. Furthermore, renal markers (creatinine and NGAL) closely associated with potassium and glucose. These findings were not seen among patients without diabetes.
Conclusion:
Patients with AHF and diabetes, compared with those without diabetes, have distinct biomarker profiles. Network analysis suggests that cardiac remodelling, inflammation, and fibrosis are closely associated with each other in patients with diabetes. Furthermore, potassium levels may be sensitive to changes in renal function as reflected by the strong renal–potassium–glucose correlation. These findings were not seen among patients without diabetes and may suggest distinct pathophysiological processes among AHF patients with diabetes
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