6,107 research outputs found
Encapsulation process sterilizes and preserves surgical instruments
Ethylene oxide is blended with an organic polymer to form a sterile material for encapsulating surgical instruments. The material does not bond to metal and can be easily removed when the instruments are needed
Process for preparing sterile solid propellants Patent
Using ethylene oxide in preparation of sterilized solid rocket propellants and encapsulating material
Direct and long-lasting effects elicited by repeated drug administration on 50-kHz ultrasonic vocalizations are regulated differently: Implications for the study of the affective properties of drugs of abuse
Several studies suggest that 50-kHz ultrasonic vocalizations (USVs) may indicate a positive affective state in rats, and these vocalizations are increasingly being used to investigate the properties of psychoactive drugs. Previous studies, however, have focused on dopaminergic psychostimulants and morphine, whereas little is known about how other drugs modulate 50-kHz USVs. To further elucidate the neuropharmacology of 50-kHz USVs, the present study characterized the direct and long-lasting effects of different drugs of abuse, by measuring the number of 50-kHz USVs and their 'trill' subtype emitted by adult male rats. Rats received repeated administrations of amphetamine (2 mg/kg, i.p.), 3,4-methylenedioxymethamphetamine (MDMA, 7.5 mg/kg, i.p.), morphine (7.5 mg/kg, s.c.), or nicotine (0.4 mg/kg, s.c.), on either consecutive or alternate days (five administrations in total) in a novel environment. Seven days later, rats were re-exposed to the drug-paired environment, subjected to USVs recording, and then challenged with the same drug. Finally, 7 d after the challenge, rats were repeatedly exposed to the drug-paired environment and vocalizations were measured. Amphetamine was the only drug to stimulate 50-kHz USVs and 'trill' subtype emission during administration and challenge. Conversely, all rats emitted 50-kHz USVs when re-exposed to the test cage, and this effect was most marked in morphine-treated rats, and less evident in nicotine-treated rats. This study demonstrates that the direct and long-lasting effects of drugs on 50-kHz USVs are regulated differently, providing a better understanding of the usefulness of these vocalizations in the study of psychoactive drugs
Dissecting Kinematics and Stellar Populations of Counter-Rotating Galaxies with 2-Dimensional Spectroscopy
We present a spectral decomposition technique and its applications to a
sample of galaxies hosting large-scale counter-rotating stellar disks. Our
spectral decomposition technique allows to separate and measure the kinematics
and the properties of the stellar populations of both the two counter-rotating
disks in the observed galaxies at the same time. Our results provide new
insights on the epoch and mechanism of formation of these galaxies.Comment: 4 pages, 3 figures. Contributed talk presented at the Conference
"Multi-Spin galaxies", September 30 - October 3, 2013, INAF-Astronomical
Observatory of Capodimonte, Naples, Italy. To be published in ASP Conf. Ser.,
Multi-Spin Galaxies, ed. E. Iodice & E. M. Corsini (San Francisco: ASP
Extracorporeal CO2 removal in hypercapnic patients who fail noni nvasive ventialtion and refuse endotracheal intubation. a case series
Noninvasive ventilation (NIV) represents the standard of care for patients with exacerbation of chronic obstructive pulmonary disease. However, NIV fails in almost 40% of the most severe forms of acute hypercapnic respiratory failure and patients must undergo endotracheal intubation and invasive ventilation. Such transition from NIV to invasive ventilation is associated to increased mortality. Under these circumstances, patients may express a clear intention not to be intubated
Injunction Against Prosecution of Divorce Actions in Other States
Aims: The formation scenario of extended counter-rotating stellar disks in galaxies is still debated. In this paper, we study the S0 galaxy IC 719 known to host two large-scale counter-rotating stellar disks in order to investigate their formation mechanism.
Methods: We exploit the large field of view and wavelength coverage of the Multi Unit Spectroscopic Explorer (MUSE) spectrograph to derive two-dimensional (2D) maps of the various properties of the counter-rotating stellar disks, such as age, metallicity, kinematics, spatial distribution, the kinematical and chemical properties of the ionized gas, and the dust map.
Results: Due to the large wavelength range, and in particular to the presence of the Calcium Triplet \u3bb\u3bb8498, 8542, 8662 \uc5 (CaT hereafter), the spectroscopic analysis allows us to separate the two stellar components in great detail. This permits precise measurement of both the velocity and velocity dispersion of the two components as well as their spatial distribution. We derived a 2D map of the age and metallicity of the two stellar components, as well as the star formation rate and gas-phase metallicity from the ionized gas emission maps.
Conclusions: The main stellar disk of the galaxy is kinematically hotter, older, thicker and with larger scale-length than the secondary disk. There is no doubt that the latter is strongly linked to the ionized gas component: they have the same kinematics and similar vertical and radial spatial distribution. This result is in favor of a gas accretion scenario over a binary merger scenario to explain the origin of counter-rotation in IC 719. One source of gas that may have contributed to the accretion process is the cloud that surrounds IC 719
Stellar populations in the bulges of isolated galaxies
open7siWe present photometry and long-slit spectroscopy for 12 S0 and spiral galaxies selected
from the Catalogue of Isolated Galaxies. The structural parameters of the sample galaxies are
derived from the Sloan Digital Sky Survey i-band images by performing a two-dimensional
photometric decomposition of the surface brightness distribution. This is assumed to be the
sum of the contribution of a Sersic bulge, an exponential disc, and a Ferrers bar characterized
by elliptical and concentric isophotes with constant ellipticity and position angles. The rotation
curves and velocity dispersion profiles of the stellar component are measured from the spectra
obtained along the major axis of galaxies. The radial profiles of the Hβ, Mg and Fe line-
strength indices are derived too. Correlations between the central values of the Mg2
and Fe line-strength indices and the velocity dispersion are found. The mean age, total metallicity
and total α/Fe enhancement of the stellar population in the centre and at the radius, where the
bulge gives the same contribution to the total surface brightness as the remaining components,
are obtained using stellar population models with variable element abundance ratios. We
identify intermediate-age bulges with solar metallicity and old bulges with a large spread in
metallicity. Most of the sample bulges display supersolar α/Fe enhancement, no gradient in
age and negative gradients of metallicity and α/Fe enhancement. These findings support a
formation scenario via dissipative collapse where environmental effects are remarkably less
important than in the assembly of bulges of galaxies in groups and clusters.openMorelli, Lorenzo; Parmiggiani, Marco; Corsini, ENRICO MARIA; Costantin, Luca; DALLA BONTA', Elena; MĂ©ndez Abreu, J.; Pizzella, AlessandroMorelli, Lorenzo; Parmiggiani, Marco; Corsini, ENRICO MARIA; Costantin, Luca; DALLA BONTA', Elena; MĂ©ndez Abreu, J.; Pizzella, Alessandr
No evidence for small disk-like bulges in a sample of late-type spirals
About 20% of low-redshift galaxies are late-type spirals with a small or no
bulge component. Although they are the simplest disk galaxies in terms of
structure and dynamics, the role of the different physical processes driving
their formation and evolution is not yet fully understood. We investigated
whether small bulges of late-type spirals follow the same scaling relations
traced by ellipticals and large bulges and if they are disk-like or classical
bulges. We derived the photometric and kinematic properties of 9 nearby
late-type spirals. To this aim, we analyzed the surface brightness distribution
from the i-band images of the Sloan Digital Sky Survey and obtained the
structural parameters of the galaxies from a two-dimensional photometric
decomposition. We measured the line-of-sight stellar velocity distribution
within the bulge effective radius from the long-slit spectra taken with high
spectral resolution at the Telescopio Nazionale Galileo. We used the
photometric and kinematic properties of the sample bulges to study their
location in the Fundamental Plane, Kormendy, and Faber-Jackson relations
defined for ellipticals and large bulges. We found that our sample bulges
satisfy some of the photometric and kinematic prescriptions for being
considered disk-like bulges such as small sizes and masses with nearly
exponential light profiles, small bulge-to-total luminosity ratios, low stellar
velocity dispersions, and ongoing star formation. However, each of them follows
the same scaling relations of ellipticals, massive bulges, and compact
early-type galaxies so they cannot be classified as disk-like systems. We find
a single population of galaxy spheroids that follow the same scaling relations,
where the mass seems to lead to a smooth transition in the photometric and
kinematic properties from less massive bulges to more massive bulges and
ellipticals.Comment: Accepted for publication in A&A, 20 pages, 10 figure
Teat End and Skin Conditioning Evaluation of Two Experimental Heptanoic Acid Teat Dips During Winter
Winter conditions can lead to rapid dehydration and cracking of teat tissue, thus increasing mastitis risks. The purpose of this study was to evaluate the teat end health and skin conditioning performance of two experimental heptanoic acid based teat dips vs the commercial product Remain Gold ® using a split udder design during the winter season under best management winter milking practices. The experimental heptanoic acid teat dips KX-6185 and KX-6186 showed similar teat end health and teat skin conditioning to Remain Gold under winter conditions. Marked changes in teat end scores were measured over time and over periods as short as days. On the other hand, product treatment comparisons frequently showed parallel trends in score averages. This illustrates the importance of a split udder design to evaluate skin conditioning performance. The split udder design minimizes the risk of experimental bias due to cow and environmental factors. Most reported teat skin studies rely on comparing teat dips in separate cow groups with little consideration to group balancing even though factors such as hyperkeratosis is known to be affected by cow age and lactation stage. This study illustrates the high risk of traditional design skin toleration studies inaccurately attributing effects to teat dips
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