98 research outputs found
Fractura diafisaria del antebrazo : tratamiento por fijación externa. Bases mecánico-anatómicas
Intentamos explicar en este trabajo las bases teórico-prácticas que seguimos en las fracturas diafisarias del antebrazo en su tratamiento mediante fijación externa según nuestros conocimientos anatómico-mecánicos.We try to explain in ihis paper the theoreticpractical basis that we follow in the dyaphiseal fractures of the forearm by skeletal fixation treatment according to our mechanical and anatomical knowledge
SPIRE-FTS observations of RCW 120
The expansion of Galactic HII regions can trigger the formation of a new
generation of stars. However, little is know about the physical conditions that
prevail in these regions. We study the physical conditions that prevail in
specific zones towards expanding HII regions that trace representative media
such as the photodissociation region, the ionized region, and condensations
with and without ongoing star formation. We use the SPIRE Fourier Transform
Spectrometer (FTS) on board to observe the HII region RCW 120.
Continuum and lines are observed in the m range. Line intensities
and line ratios are obtained and used as physical diagnostics of the gas. We
used the Meudon PDR code and the RADEX code to derive the gas density and the
radiation field at nine distinct positions including the PDR surface and
regions with and without star-formation activity. For the different regions we
detect the atomic lines [NII] at m and [CI] at and m,
the ladder between the and levels and the
ladder between the and levels, as well as CH in absorption. We find gas temperatures in the range K for
densities of , and a high column density on the order
of that is in agreement with dust
analysis. The ubiquitousness of the atomic and CH emission suggests the
presence of a low-density PDR throughout RCW 120. High-excitation lines of CO
indicate the presence of irradiated dense structures or small dense clumps
containing young stellar objects, while we also find a less dense medium
() with high temperatures (K).Comment: 11 pages, 11 figures, accepted by A&
Impact of gaps in the asteroseismic characterization of pulsating stars. I. On the efficiency of pre-whitening
It is known that the observed distribution of frequencies in CoRoT and Kepler
{\delta} Scuti stars has no parallelism with any theoretical model.
Pre-whitening is a widespread technique in the analysis of time series with
gaps from pulsating stars located in the classical instability strip such as
{\delta} Scuti stars. However, some studies have pointed out that this
technique might introduce biases in the results of the frequency analysis. This
work aims at studying the biases that can result from pre-whitening in
asteroseismology. The results will depend on the intrinsic range and
distribution of frequencies of the stars. The periodic nature of the gaps in
CoRoT observations, just in the range of the pulsational frequency content of
the {\delta} Scuti stars, is shown to be crucial to determine their oscillation
frequencies, the first step to perform asteroseismolgy of these objects. Hence,
here we focus on the impact of pre-whitening on the asteroseismic
characterization of {\delta} Scuti stars. We select a sample of 15 {\delta}
Scuti stars observed by the CoRoT satellite, for which ultra-high quality
photometric data have been obtained by its seismic channel. In order to study
the impact on the asteroseismic characterization of {\delta} Scuti stars we
perform the pre-whitening procedure on three datasets: gapped data, linearly
interpolated data, and ARMA interpolated data. The different results obtained
show that at least in some cases pre-whitening is not an efficient procedure
for the deconvolution of the spectral window. therefore, in order to reduce the
effect of the spectral window to the minimum it is necessary to interpolate
with an algorithm that is aimed to preserve the original frequency content, and
not only to perform a pre-whitening of the data.Comment: 27 pages, 47 figures Tables and typos fixe
Physical properties of the Sh2-104 HII region as seen by Herschel
Context. Sh2-104 is a Galactic Hii region with a bubble morphology, detected at optical and radio wavelengths. It is considered the first observational confirmation of the collect-and-collapse model of triggered star-formation.
Aims. We aim to analyze the dust and gas properties of the Sh2-104 region to better constrain its effect on local future generations of stars. In addition, we investigate the relationship between the dust emissivity index β and the dust temperature, T_(dust).
Methods. Using Herschel PACS and SPIRE images at 100, 160, 250, 350 and 500 μm we determine T_(dust) and β throughout Sh2-104, fitting the spectral energy distributions (SEDs) obtained from aperture photometry. With the SPIRE Fourier-transform spectrometer (FTS) we obtained spectra
at different positions in the Sh2-104 region. We detect J-ladders of ^(12)CO and ^(13)CO, with which we derive the gas temperature and column density. We also detect proxies of ionizing flux as the [N_(II)] ^3P_1−^3P_0 and [C_I] ^3P_2−^3P_1 transitions.
Results. We find an average value of β ~ 1.5 throughout Sh2-104, as well as a T_(dust) difference between the photodissociation region (PDR, ~25K)
and the interior (~40K) of the bubble. We recover the anti-correlation between β and dust temperature reported numerous times in the literature.
The relative isotopologue abundances of CO appear to be enhanced above the standard ISM values, but the obtained value is very preliminary and is still affected by large uncertainties
Intoxicación por paraquat : revisión
En este trabajo se revisan las características de la intoxicación por paraquat, y se presentan 15 casos clínicos altamente sugestivos de dicha intoxicación. El paraquat es un compuesto bipiridilo ampliamente usado en agricultura. Debido a que la intoxicación tiene efectos progresivos e irreversibles, es importante conocer la posibilidad de acceso al tóxico, pero ello muchas veces no es posible. Dado que el diagnóstico muchas veces es difícil para el clínico, la observación de un distress respiratorio severo, que empeora progresivamente en ausencia de signos radiológicos significativos, justifica un diagnóstico presuntivo de intoxicación por paraquat.In this work, we review the characteristics of paraquat poisoning and compare it with 15 clinical cases highly suggestive of this poisoning. Paraquat is a bipyridzlium compound, widely used as a contact herbicide in agriculture. Because the poisoning has progressive and irreversible effects, it's important to know a definitive history of acces to paraquat, but it 's difficult. Because the problem of diagnosis remains difficult for the practitioner; a clinical features of progressively worsening respiratory distress, in absence of radiógraphic demonstration of adequate cause of dyspnoea, justify a pressumptive diagnosis of paraquat poisoning
Fragmentation in the Massive Star-Forming Region IRAS 19410+2336
The Core Mass Functions (CMFs) of low-mass star-forming regions are found to
resemble the shape of the Initial Mass Function (IMF). A similar result is
observed for the dust clumps in high-mass star forming regions, although at
spatial scales of clusters that do not resolve the substructure found in them.
The region IRAS 19410+2336 is one exception, having been observed at spatial
scales on the order of ~2500AU, resolving the clump substructure into
individual cores.
We mapped that region with the PdBI in the 1.4mm and 3mm continuum and
several transitions of H2CO and CH3CN. The H2CO transitions were also observed
with the IRAM 30m Telescope. We detected 26 continuum sources at 1.4mm with a
spatial resolution down to ~2200 AU, distributed in two protoclusters. With the
lines emission we derived the temperature structure of the region, ranging from
35 to 90K. With them we calculated the core masses of the detected sources,
ranging from ~0.7 to ~8 M_sun. These masses were strongly (~90%) affected by
the interferometer spatial filtering. Considering only the detected dense cores
we derived a CMF with a power-law index b=-2.3+-0.2. We resolve the Jeans
length of the protoclusters by one order of magnitude, and only find little
velocity dispersion between the different subsources.
Since we cannot unambiguously differentiate protostellar and prestellar
cores, the derived CMF is not prestellar. Also, because of the large missing
flux, we cannot establish a firm link between the CMF and the IMF. This implies
that future high-mass CMF studies will need to complement the interferometer
continuum data with the short spacing data, a task suitable for ALMA. We note
that the method of extracting temperatures using H2CO lines becomes less
applicable when reaching the dense core scales of the interferometric
observations because most of the H2CO appears to originate in the envelope
structure.Comment: 17 pages, 12 figures, accepted by A&
Transmission of ‘Candidatus Phytoplasma pyri’ by naturally infected Cacopsylla pyri to peach, an approach to the epidemiology of peach yellow leaf roll (PYLR) in Spain
Peach orchards in the northeast of Spain were severely affected in 2012 by a previously unreported disease in this area. The symptoms included early reddening, leaf curling, decline, abnormal fruits, and in some cases death of the peach trees. All the infected peach samples were positive for ‘Candidatus Phytoplasma pyri’, but none were infected by the ‘Ca. Phytoplasma prunorum’. In this work, potential vectors able to transmit ‘Ca. Phytoplasma pyri’ from pear to peach and between peach trees were studied and their infective potential was analysed at different times of the year. Transmission trials of the phytoplasma with potential vectors to an artificial feeding medium for insects and to healthy peach trees were conducted. Additionally, isolated phytoplasmas were genetically characterized to determine which isolates were able to infect peach trees. Results showed that the only insect species captured inside peach plots that was a carrier of the ‘Ca. Phytoplasma pyri’ phytoplasma was Cacopsylla pyri. Other insect species captured and known to be phytoplasma transmitters were present in very low numbers, and were not infected with ‘Ca. Phytoplasma pyri’ phytoplasma. A total of 1928 individuals of C. pyri were captured in the peach orchards, of which around 49% were phytoplasma carriers. All the peach trees exposed to C. pyri in 2014, and 65% in 2015, were infected by ‘Ca. Phytoplasma pyri’ 1 year after exposure, showing that this species is able to transmit the phytoplasma to peach. Molecular characterization showed that some genotypes are preferentially determined in peach.info:eu-repo/semantics/acceptedVersio
A phase I pharmacokinetic and safety study of cabazitaxel in adult cancer patients with normal and impaired renal function
Limited data are available on cabazitaxel pharmacokinetics in patients with renal impairment. This open-label, multicenter study assessed cabazitaxel in patients with advanced solid tumors and normal or impaired renal function.
Cohorts A (normal renal function: creatinine clearance [CrCL] >80 mL/min/1.73 m), B (moderate renal impairment: CrCL 30 to <50 mL/min/1.73 m) and C (severe impairment: CrCL <30 mL/min/1.73 m(2)) received cabazitaxel 25 mg/m (A, B) or 20 mg/m(2) (C, could be escalated to 25 mg/m), once every 3 weeks. Pharmacokinetic parameters and cabazitaxel unbound fraction (F) were assessed using linear regression and mixed models. Geometric mean (GM) and GM ratios (GMRs) were determined using mean CrCL intervals (moderate and severe renal impairment: 40 and 15 mL/min/1.73 m) versus a control (90 mL/min/1.73 m).
Overall, 25 patients received cabazitaxel (median cycles: 3 [range 1-20]; Cohort A: 5 [2-13]; Cohort B: 3 [1-15]; and Cohort C: 5 [1-20]), of which 24 were eligible for pharmacokinetic analysis (eight in each cohort). For moderate and severe renal impairment versus normal renal function, GMR estimates were: clearance normalized to body surface area (CL/BSA) 0.95 (90% CI 0.80-1.13) and 0.89 (0.61-1.32); area under the curve normalized to dose (AUC/dose) 1.06 (0.88-1.27) and 1.14 (0.76-1.71); and F U 0.99 (0.94-1.04) and 0.97 (0.87-1.09), respectively. Estimated slopes of linear regression of log parameters versus log CrCL (renal impairment) were: CL/BSA 0.06 (-0.15 to 0.28); AUC/dose -0.07 (-0.30 to 0.16); and F U 0.02 (-0.05 to 0.08). Cabazitaxel safety profile was consistent with previous reports.
Renal impairment had no clinically meaningful effect on cabazitaxel pharmacokinetics.This study was supported by Sanofi. Javier Garcia-Corbacho acknowledges clinical fellowship support from SEOM. Experimental Cancer Medicine Centre (ECMC) and NIHR Biomedical Research Centre (BRC) funding is also acknowledged for the Cambridge Cancer Centre
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