12,353 research outputs found
High Resolution 4.7 um Keck/NIRSPEC Spectra of Protostars. I: Ices and Infalling Gas in the Disk of L1489 IRS
We explore the infrared M band (4.7 um) spectrum of the class I protostar
L1489 IRS in the Taurus Molecular Cloud. This is the highest resolution wide
coverage spectrum at this wavelength of a low mass protostar observed to date
(R=25,000; Dv=12 km/s). Many narrow absorption lines of gas phase 12CO, 13CO,
and C18O are detected, as well as a prominent band of solid 12CO. The gas phase
12CO lines have red shifted absorption wings (up to 100 km/s), likely
originating from warm disk material falling toward the central object. The
isotopes and the 12CO line wings are successfully fitted with a contracting
disk model of this evolutionary transitional object (Hogerheijde 2001). This
shows that the inward motions seen in millimeter wave emission lines continue
to within ~0.1 AU from the star. The colder parts of the disk are traced by the
prominent CO ice band. The band profile results from CO in 'polar' ices (CO
mixed with H2O), and CO in 'apolar' ices. At the high spectral resolution, the
'apolar' component is, for the first time, resolved into two distinct
components, likely due to pure CO and CO mixed with CO2, O2 and/or N2. The ices
have probably experienced thermal processing in the upper disk layer traced by
our pencil absorption beam: much of the volatile 'apolar' ices has evaporated
and the depletion factor of CO onto grains is remarkably low (~7%). This study
shows that high spectral resolution 4.7 um observations provide important and
unique information on the dynamics and structure of protostellar disks and the
evolution of ices in these disks.Comment: 11 pages, 6 figures Scheduled to appear in ApJ 568 n2, 1 April 200
Deliriumin the ICU setting ‐ a subjective and theoretical survey before the implementation of the Confusion Assessment Method for the ICU in an unit
Background and Goal of Study: The current definition of delirium comprises
acute change or fluctuation in mental status and inattention, accompanied by
either altered level of consciousness or disorganized thinking. It is a frequent
condition in the ICU and it is associated with longer hospital stay, increase in
mortality at 6 months and long-term cognitive impairment, but remains under
diagnosed. The Confusion Assessment Method for the Intensive Care Unit
(CAM-ICU) has been validated and implemented in many ICUs and its use is
recommended by the Society of Critical Care Medicine. It is our purpose to
evaluate the individual perspective and the objective knowledge of our staf f
about delirium before the implementation of the CAM-ICU.
Materials and Methods: Anonymous survey to our ICU clinical staf f which
contained subjective and ‘true or false’ questions. Data was analised with the
sof tware SPSS version 17.0. The Wilcoxon test was used to compare autoperception
of knowledge about delirium and the content of answers regarding
its definiton.
Results: Forty two questionnaires were returned (participation rate of 73%),
11 from physicians and 31 from nurses. Overall, 61,9% of inquiries think they
can give a definition for delirium in the ICU and 50% claim to be able to evaluate
delirium. 28,6% of the respondents - 63,6% of the physicians and 16,1%
of the nurses - know the CAM-ICU. From these only a quarter has received
education on this method, 75% think it’s easy to apply and 66% don’t see its
use as an increase in the daily workload. We found a high rate of wrong and
‘I don’t know’ answers to questions about operationalization, diagnosis and
outcome. The subjects’ auto-perception on their knowledge about delirium
[Likert scale] was compared to their ability to answer questions related to
its definiton - ‘attention deficit is essencial for diagnosis’ [true], Wilcoxon test
Z=-4,699 (p< 0,001); ‘disorganized thinking is essential for diagnosis’ [false],
Wilcoxon test Z=-4,437 (p< 0,001).
Conclusions: The respondents’ auto perception of knowledge about delirium
doesn’t translate in the ability of giving an appropriate definition and making
an adequate evaluation. Most of the inquiries don’t know the CAM-ICU, but
those who do believe it’s easy to apply and its use won’t increase the workload.
We performed educational sessions about delirium and the CAM-ICU in
our unit to encourage our clinical staf f to deal properly with this hazardous
condition
Effect of the saliva biomolecules on the interface zirconia/Ti6Al4V triboactivity
Abstract in proceedings of the Fourth International Congress of CiiEM: Health, Well-Being and Ageing in the 21st Century, held at Egas Moniz’ University Campus in Monte de Caparica, Almada, from 3–5 June 2019.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.info:eu-repo/semantics/publishedVersio
Field calibration of time domain reflectrometry in an Amazonian rainforest soil with variable bulk density: sources of error and influence of land-use.
bitstream/item/180974/1/ID-3848-67-82.pd
Fertilizantes e corretivo da acidez do solo em pimenta-de-cheiro (Capsicum chinense) cultivada no Estado do Amazonas (1ª aproximação).
Clima e solo. Semeadura e plantio. Amostragem de solo. Calagem e adubação. Adubação de plantio. Adubação de manutenção. Análise foliar
Liquid crystal anchoring transitions on aligning substrates processed by plasma beam
We observe a sequence of the anchoring transitions in nematic liquid crystals
(NLC) sandwiched between the hydrophobic polyimide substrates treated with the
plasma beam. There is a pronounced continuous transition from homeotropic to
low tilted (nearly planar) alignment with the easy axis parallel to the
incidence plane of the plasma beam (the zenithal transition) that takes place
as the exposure dose increases. In NLC with positive dielectric anisotropy, a
further increase in the exposure dose results in in-plane reorientation of the
easy axis by 90 degrees (the azimuthal transition). This transition occurs
through the two-fold degenerated alignment characteristic for the second order
anchoring transitions. In contrast to critical behavior of anchoring, the
contact angle of NLC and water on the treated substrates monotonically declines
with the exposure dose. It follows that the surface concentration of
hydrophobic chains decreases continuously. The anchoring transitions under
consideration are qualitatively interpreted by using a simple phenomenological
model of competing easy axes which is studied by analyzing anchoring diagrams
of the generalized polar and non-polar anchoring models.Comment: revtex4, 18 pages, 10 figure
Análise discriminante do solo em Terra Preta de Índio, Iranduba/AM.
O objetivo deste trabalho foi realizar a análise discriminante do solo da TPI do campo experimental do Caldeirão-Embrapa Amazônia Ocidental no município de Iranduba-AM
X-Shooter study of accretion in Chamaeleon I
DF acknowledges support from the Italian Ministry of Science and Education (MIUR), project SIR (RBSI14ZRHR) and from the ESTEC Faculty Visiting Scientist Programme.We present the analysis of 34 new VLT/X-Shooter spectra of young stellar objects in the Chamaeleon I star-forming region, together with four more spectra of stars in Taurus and two in Chamaeleon II. The broad wavelength coverage and accurate flux calibration of our spectra allow us to estimate stellar and accretion parameters for our targets by fitting the photospheric and accretion continuum emission from the Balmer continuum down to ~700 nm. The dependence of accretion on stellar properties for this sample is consistent with previous results from the literature. The accretion rates for transitional disks are consistent with those of full disks in the same region. The spread of mass accretion rates at any given stellar mass is found to be smaller than inmany studies, but is larger than that derived in the Lupus clouds using similar data and techniques. Differences in the stellar mass range and in the environmental conditions between our sample and that of Lupus may account for the discrepancy in scatter between Chamaeleon I and Lupus.Complete samples in Chamaeleon I and Lupus are needed to determine whether the difference in scatter of accretion rates and the lack of evolutionary trends are not influenced by sample selection.PostprintPeer reviewe
Recuperação e utilização de pastagens de capim-jaraguá (Hyparrhenia rufa) na engorda de novilhos em Marabá, Pará.
bitstream/item/32667/1/CPATU-BP134.pd
Methotrexate and Cyclosporine Treatments Modify the Activities of Dipeptidyl Peptidase IV and Prolyl Oligopeptidase in Murine Macrophages
Analysis of the effects of cyclosporine A (25–28 mgkg−1) and/or methotrexate (0.1 mgkg−1) treatments on dipeptidyl peptidase IV (DPPIV) and prolyl oligopeptidase (POP) activities and on algesic response in two distinct status of murine macrophages (Mφs) was undertaken. In resident Mφs, DPPIV and POP were affected by neither individual nor combined treatments. In thioglycolate-elicited Mφs, methotrexate increased DPPIV (99–110%) and POP (60%), while cyclosporine inhibited POP (21%). Combined treatment with both drugs promoted a rise (51–84%) of both enzyme activities. Only cyclosporine decreased (42%) the tolerance to algesic stimulus. Methotrexate was revealed to exert prevalent action over that of cyclosporine on proinflammatory Mφ POP. The opposite effects of methotrexate and cyclosporine on POP activity might influence the availability of the nociceptive mediators bradykinin and substance P in proinflammatory Mφs. The exacerbated response to thermally induced algesia observed in cyclosporine-treated animals could be related to upregulation of those mediators
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