1,312 research outputs found
Diabetic ketoacidosis with mild hyperglycemia associated with the use of canagliflozin. Report of one case with type 1 diabetes
IndexaciĂłn: Web of Science; Scopus; Scielo.Diabetic ketoacidosis with mild hyperglycemia is a major complication of sodium-glucose cotransporter 2 inhibitors. Although its use is not approved for patients with type 1 diabetes mellitus, the drug is often prescribed with the hope of optimizing metabolic control. We report a 20 years old female with hypo-thyroidism and type 1 diabetes consulting for vomiting and abdominal pain. The patient had used canagliflozin during the two previous months. Laboratory showed a blood glucose of 200 mg/dl, a severe metabolic acidosis (pH 7.1) and ketonemia. The patient was successfully treated in the intensive care unit.http://ref.scielo.org/65brd
Detailed Numerical Simulation of Condensers and Evaporators Using Pure and Mixed Refrigerants
The Nuclear Stellar Cluster in the Seyfert~1 Galaxy NGC 3227: High Angular Resolution NIR Imaging and Spectroscopy
NIR high angular resolution speckle imaging and imaging spectroscopy of the
nuclear region (10'' ~ 840pc) of the Seyfert1 galaxy NGC3227 are presented. A
nuclear stellar cluster is slightly resolved in the J and H band with
increasing contribution to the NIR continuum from the K to the J band. The
stellar absorption lines are extended compared to the neighboring continuum
suggesting a cluster size of ~ 70pc FWHM. Analysis of those lines suggests that
the stars are contributing about 65% (40%) of the total continuum emission in
the H (K) band in a 3.6'' aperture. Population synthesis in conjunction with
NIR spectral synthesis indicates an age of 25 to 50 Myr when red supergiants
contribute most to the NIR light. This is supported by published optical data
on the MgIb line and the CaII triplet. Although a higher age of ~ 0.5 Gyr where
AGB stars dominate the NIR light can not be excluded, the observed parameters
are at the limit of those expected for a cluster dominated by AGB stars.
However, in either case the resolved stellar cluster contributes only about ~
15 % of the total dynamical mass in the inner 300pc implying another much older
stellar population. Pure constant star formation over the last 10 Gyr can be
excluded. Therefore, at least two star formation/starburst events took place in
the nucleus of NGC3227. Since such sequences in the nuclear star formation
history are also observed in the nuclei of other galaxies a link between the
activity of the star formation and the AGN itself seems likely.Comment: accepted for publication in the Astrophysical Journal, 46 pages, 15
figure
P10-13. Increased production of alpha-defensins 1â3 by dendritic cells in HIV-infected individuals is associated with a slower disease progression rate
The Nature of LINERs
We present -band (m) spectroscopy of a sample of nine
galaxies showing some degree of LINER activity (classical LINERs, weak-[O {\sc
i}] LINERs and transition objects), together with -band spectroscopy for
some of them. A careful subtraction of the stellar continuum allows us to
obtain reliable [Fe {\sc ii}]m/Pa line ratios. We conclude
that different types of LINERs (i.e., photoionized by a stellar continuum or by
an AGN) cannot be easily distinguished based solely on the [Fe {\sc ii}]m/Pa line ratio.
The emission line properties of many LINERs can be explained in terms of an
aging starburst. The optical line ratios of these LINERs are reproduced by a
model with a metal-rich H {\sc ii} region component photoionized with a single
stellar temperature K, plus a supernova remnant (SNR) component.
The [Fe {\sc ii}] line is predominantly excited by shocks produced by SNRs in
starbursts and starburst-dominated LINERs, while Pa tracks H {\sc ii}
regions ionized by massive young stars. The contribution from SNRs to the
overall emission line spectrum is constrained by the [Fe {\sc ii}]m/Pa line ratio. Although our models for aging starbursts are
constrained only by these infrared lines, they consistently explain the optical
spectra of the galaxies also.
The LINER-starburst connection is tested by predicting the time dependence of
the ratio of the ionizing luminosity () to the supernova rate
(SNr), /(SNr). We predict the relative number of starbursts to
starburst-dominated LINERs (aging starbursts) and show that it is in
approximate agreement with survey findings for nearby galaxies.Comment: Accepted in ApJ (19 pages, 8 figures, uses emulateapj.sty
Effect of Eu 3+
This work presents the structural, morphological, and luminescent characterization of pure SrTiO3 and SrTiO3:Eu3+ powders doped with different europium atomic concentrations from 3.0 to 7.0âa.t.%. Those phosphors were prepared by pressure-assisted combustion synthesis using titanium oxide as precursor and were subjected to postannealing at 1200°C. XRD measurements indicated that undoped and Eu3+ doped samples presented a single cubic crystalline phase and SEM images demonstrated that we have particles with sizes in the range of 0.2â”mâ1.0â”m. Moreover, the size of the grains increases as the content of Eu3+ dopant increases. A strong red emission from Eu3+ ions was obtained by photoluminescence under excitation at 396ânm and confirmed by cathodoluminescence. All those results indicate that our red phosphors could be useful for potential applications in solid state lighting and field emission displays
IRAS 06562-0337, The Iron Clad Nebula: A New Young Star Cluster
IRAS 06562-0337 has been the recent subject of a classic debate:
proto-planetary nebula or young stellar object? We present the first 2 micron
image of IRAS 06562-0337, which reveals an extended diffuse nebula containing
approximately 70 stars inside a 30 arcsec radius around a bright, possibly
resolved, central object. The derived stellar luminosity function is consistent
with that expected from a single coeval population, and the brightness of the
nebulosity is consistent with the predicted flux of unresolved low-mass stars.
The stars and nebulosity are spatially coincident with strong CO line emission.
We therefore identify IRAS 06562-0337 as a new young star cluster embedded in
its placental molecular cloud. The central object is likely a Herbig Be star, M
approx 20 M_sun, which may be seen in reflection. We present medium resolution,
high S/N, 1997 epoch optical spectra of the central object. Comparison with
previously published spectra shows new evidence for time variable permitted and
forbidden line emission, including SiII, FeII, [FeII], and [OI]. We suggest the
origin is a dynamic stellar wind in the extended, stratified atmosphere of the
massive central star in IRAS 06562-0337.Comment: 25 pages (4 figures) using aaspp4.sty. Accepted for publication in A
Artillery Shells over Circinus
The recently identified Circinus Galaxy is the nearest (about 4 Mpc) Seyfert
2 galaxy known and we now demonstrate to be one of the best laboratories for
studying the effects of nuclear activity on the surrounding environment. Here
we present new imaging Fabry-Perot observations of Circinus which confirm the
existence of an ionization cone in this object but also show for the first time
a complex of ionized filaments extending radially from the nucleus out to
distances of 1 kpc. Arcs suggestive of bow shocks are observed at the terminus
of some of these filamentary structures. Most spectacular of all, one of the
structures appears to be a scaled-up version of a Herbig-Haro jet. The velocity
field of the filaments confirms that they represent material expelled from the
nucleus (possibly in the form of `bullets') or entrained in a wide-angle wind
roughly aligned with the polar axis of the galaxy. The motions observed across
the ionization cone are highly supersonic, so high-velocity shocks are likely
to contribute to the ionization of the line emitting gas. However, it is not
clear at present whether shock ionization dominates over photoionization by the
Seyfert 2 nucleus. Extrapolation of the filaments to smaller radii comes to
within 1 arcsec (about 20 pc) of the infrared nucleus, therefore suggesting a
AGN or nuclear starburst origin to these features. The complex of radial
filaments detected in the Circinus galaxy is unique among active galaxies. The
frequency of such events is unknown since only a handful of galaxies have been
observed at the sensitivity level of our present observations. The event in the
Circinus galaxy may represent a relatively common evolutionary phase in the
lives of gas-rich active galaxies during which the dusty cocoon surrounding the
nucleus is expelled by the action of jet or wind phenomena.Comment: 22 pages including 5 figures, Latex, requires aasms4.sty. To appear
in ApJ Letters 479 (1997
Quadratic Curvature Gravity with Second Order Trace and Massive Gravity Models in Three Dimensions
The quadratic curvature lagrangians having metric field equations with second
order trace are constructed relative to an orthonormal coframe. In
dimensions, pure quadratic curvature lagrangian having second order trace
constructed contains three free parameters in the most general case. The fourth
order field equations of some of these models, in arbitrary dimensions, are
cast in a particular form using the Schouten tensor. As a consequence, the
field equations for the New massive gravity theory are related to those of the
Topologically massive gravity. In particular, the conditions under which the
latter is "square root" of the former are presented.Comment: 24 pages, to appear in GR
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