281 research outputs found
Molecular outflows in the young open cluster IC348
We present a wide-field survey of the young open cluster IC348 for molecular
H2 outflows. Outflow activity is only found at its south-western limit, where a
new subcluster of embedded sources is in an early phase of its formation. If
the IC348 cluster had been built up by such subclusters forming at different
times, this could explain the large age-spread that Herbig (1998) found for the
IC348 member stars. In addition to several compact groups of H2 knots, our
survey reveals a large north-south oriented outflow, and we identify the newly
discovered far-infrared and mm-object IC348MMS as its source. New deep images
in the 1-0 S(1) line of molecular hydrogen trace the HH211 jet and counterjet
as highly-collimated chains of knots, resembling the interferometric CO and SiO
jets. This jet system appears rotated counter-clockwise by about 3 degrees with
respect to the prominent H2 bow shocks. Furthermore, we resolve HH211-mm as a
double point-like source in the mm-continuum.Comment: 10 pages, 9 figures, accepted for publication in Ap
Reliability of 2D ultrasound imaging associated with transient ShearWave Elastography method to analyze spastic gastrocnemius medialis muscle architecture and viscoelastic properties
PurposeThe aim of the study was to assess the reliability of pennation angle (PA) and muscle thickness (MT) 2D measurements and of shear elastic modulus measurement, using ultrasound imaging (US). Those measurements were made on spastic gastrocnemius medialis muscle at rest and at maximal passive stretching, in post-stroke hemiplegic patients. The paretic side measurements were compared to non-paretic side.Material and methodsFourteen patients took part in 2 inter-session reliability experiments, realized at a 7 days interval by the same operator. The AixplorerŸ Supersonic US scanner with the transient ShearWave Elastography (SWE) software was used. The stretching experiments were made manually and controlled by a goniometer.ResultsThe reliability of the 2D measurements was good. The coefficient of variation (CV) was 6.30% for MT measurement at rest, 6.40% and 8.26% for PA at rest and at maximal passive stretching respectively. The reliability of the shear elastic modulus measurement in the sagittal plane was good only at rest with a CV of 9.86%, versus 40.58% at stretching. None of the shear elastic modulus measurements in the axial plane were good. At rest, MT and PA were weaker on the paretic side (14.25±3.12mm and 17.32±5.10°) versus non-paretic side (16.30±3.19mm and 21.08±5.05°) (P<0.0001 and P=0.006). At rest, there was a small difference in the shear elastic modulus between the paretic side and the non-paretic side (5.40±1.67kPa versus 6.20±2.18kPa, P=0.041).DiscussionThis is the first description of muscle spastic structure using SWE with Supersonic Shear Imaging. 2D US associated with SWE shows promise in terms of muscular atrophy quantification and muscle histological quality assessment. These structural properties reflect some of the functional abilities regardless of motor control. It should enable further research on therapies, which impact muscle tissue quality, such as botulinum neurotoxin injections
Microclimat sous bĂąche Ă plat et son impact sur une culture de pomme de terre
Deux traitements ont Ă©tĂ© effectuĂ©s dans un dispositif en blocs alĂ©atoires complets avec quatre rĂ©pĂ©titions. Le premier sans bĂąche sert de tĂ©moin et le second utilise la bĂąche Ă plat comme couverture de la culture. La bĂąche en film polyĂ©thylĂšne perforĂ© a Ă©tĂ© installĂ©e quinze jours aprĂšs la plantation dâune culture de pomme de terre (Solanum tuberosum cv. Nicola) ayant reçu un traitement prĂ©ventif contre le mildiou. La bĂąche a Ă©tĂ© retirĂ©e juste avant la rĂ©colte de la pomme de terre. Sous bĂąche Ă plat, les tempĂ©ratures et les hygromĂ©tries de lâair ainsi que les tempĂ©ratures du sol ont Ă©tĂ© supĂ©rieures Ă celles de lâextĂ©rieur. Les gouttelettes de condensation formĂ©es sous bĂąche ont rĂ©duit considĂ©rablement la transmission lumineuse. Les rĂ©sultats agronomiques sont, par consĂ©quent, affectĂ©s par ces conditions climatiques. Une nette amĂ©lioration de la croissance vĂ©gĂ©tative de la pomme de terre a Ă©tĂ© observĂ©e sous bĂąche, mais lâattaque du mildiou a Ă©tĂ© plus importante sous bĂąche Ă plat que dans les parcelles tĂ©moins non couvertes qui ont Ă©tĂ© bien traitĂ©es. Ceci a affectĂ© le rendement de pomme de terre sous bĂąche qui a enregistrĂ© une perte de 23% par rapport au tĂ©moin non couvert
Root temperature and energy consumption at different cable depths in electrically heated substrates
Normalization of Red Cell Enolase Level Following Allogeneic Bone Marrow Transplantation in a Child with Diamond-Blackfan Anemia
We describe a girl with Diamond-Blackfan anemia with accompanying red cell enolase deficiency. At the age of 9 yr old, the patient received allogeneic bone marrow transplantation from her HLA-identical sister who had normal red cell enolase activity. While the post transplant DNA analysis with short tandem repeat has continuously demonstrated a stable mixed chimerism on follow-up, the patient remains transfusion independent and continues to show a steady increase in red cell enolase activity for over two and a half years following bone marrow transplantation
A Study of the Luminosity and Mass Functions of the Young IC 348 Cluster using FLAMINGOS Wide-Field Near-Infrared Images
We present wide-field near-infrared (JHK) images of the young, 2 Myr IC 348
cluster taken with FLAMINGOS. We use these new data to construct an infrared
census of sources, which is sensitive enough to detect a 10 Mjup brown dwarf
seen through an extinction of Av=7mag. We examine the cluster's structure and
relationship to the molecular cloud and construct the cluster's K band
luminosity function. Using our model luminosity function algorithm, we derive
the cluster's initial mass function throughout the stellar and substellar
regimes and find that the IC 348 IMF is very similar to that found for the
Trapezium Cluster with both cluster IMFs having a mode between 0.2 - 0.08 Msun.
In particular we find that, similar to our results for the Trapezium, brown
dwarfs constitute only 1 in 4 of the sources in the IC 348 cluster. We show
that a modest secondary peak forms in the substellar IC 348 KLF, corresponding
to the same mass range responsible for a similar KLF peak found in the
Trapezium. We interpret this KLF peak as either evidence for a corresponding
secondary IMF peak at the deuterium burning limit, or as arising from a feature
in the substellar mass-luminosity relation that is not predicted by current
theoretical models. Lastly, we find that IC 348 displays radial variations of
its sub-solar (0.5 - 0.08 Msun) IMF on a parsec scale. Whatever mechanism that
is breaking the universality of the IMF on small spatial scales in IC 348 does
not appear to be acting upon the brown dwarf population, whose relative size
does not vary with distance from the cluster center.Comment: 53 pages, 20 figures, AASTeX5.0. Color version of Figure 1 made
available in jpg format. Figure(s) 2,3,5 are reduced in resolution. Accepted
14 Jan 2003 to the Astronomical Journa
Structure and density of Fe-C liquid alloys under high pressure
International audienceThe density and structure of liquid Fe-C alloys have been measured up to 58 GPa and 3,200 K by in situ X-ray diffraction using a Paris-Edinburgh press and laser-heated diamond anvil cell. Study of the pressure evolution of the local structure inferred by X-ray diffraction measurements is important to understand the compression mechanism of the liquid. Obtained data show that the degree of compression is greater for the first coordination sphere than the second and third coordination spheres. The extrapolation of the measured density suggests that carbon cannot be the only light element alloyed to iron in the Earth's core, as 8-16 at % C (1.8-3.7 wt % C) would be necessary to explain the density deficit of the outer core relative to pure Fe. This concentration is too high to account for outer core velocity. The presence of other light elements (e.g., O, Si, S, and H) is thus required
Spleen cell proliferation during and after skin myiasis by human bot fly Dermatobia hominis
Asbestos-related pleural and lung fibrosis in patients with retroperitoneal fibrosis
<p>Abstract</p> <p>Background</p> <p>Retroperitoneal fibrosis (RPF) is a rare fibroinflammatory disease that leads to hydronephrosis and renal failure. In a case-control study, we have recently shown that asbestos exposure was the most important risk factor for RPF in the Finnish population. The aim of this study was to evaluate the relation of asbestos exposure to radiologically confirmed lung and pleural fibrosis among patients with RPF.</p> <p>Methods</p> <p>Chest high-resolution computed tomography (HRCT) was performed on 16 unexposed and 22 asbestos-exposed RPF patients and 18 asbestos-exposed controls. Parietal pleural plaques (PPP), diffuse pleural thickening (DPT) and parenchymal fibrosis were scored separately.</p> <p>Results</p> <p>Most of the asbestos-exposed RPF patients and half of the asbestos-exposed controls had bilateral PPP, but only a few had lung fibrosis. Minor bilateral plaques were detected in two of the unexposed RPF patients, and none had lung fibrosis. DPT was most frequent and thickest in the asbestos-exposed RPF-patients. In three asbestos-exposed patients with RPF we observed exceptionally large pleural masses that were located anteriorly in the pleural space and continued into the anterior mediastinum.</p> <p>Asbestos exposure was associated with DPT in comparisons between RPF patients and controls (case-control analysis) as well as among RPF patients (case-case analysis).</p> <p>Conclusion</p> <p>The most distinctive feature of the asbestos-exposed RPF patients was a thick DPT. An asbestos-related pleural finding was common in the asbestos-exposed RPF patients, but only a few of these patients had parenchymal lung fibrosis. RPF without asbestos exposure was not associated with pleural or lung fibrosis. The findings suggest a shared etiology for RPF and pleural fibrosis and furthermore possibly a similar pathogenetic mechanisms.</p
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