253 research outputs found
Fornecimento de água dentro do comedouro e efeitos no desempenho, carcaça e efluentes da produção de suínos.
bitstream/CNPSA/8520/1/cot231.pd
The BeppoSAX High Energy Large Area Survey HELLAS, II: Number counts and X-ray spectral properties
The BeppoSAX High Energy Large Area Survey (HELLAS) has surveyed about 85
deg^2 of sky in the 5-10 keV band down to a flux of 4-5 10^-14 erg cm-2 s-1.
The source surface density of 16.9+-6.4 deg at the survey limit
corresponds to a resolved fraction of the 5-10 keV X-ray background (XRB) of
the order of 20-30 %. Hardness ratios analysis indicates that the spectra of a
substantial fraction of the HELLAS sources (at least one third) are harder than
a alpha_E = 0.6 power law. This hardness may be due to large absorbing columns.
The hardness ratio analysis also indicates that many HELLAS sources may have a
spectrum more complex than a single absorbed power law. A soft component,
superimposed to a strongly cut-off power law, is likely to be present in
several sources.Comment: to appear in MNRA
The Space Density of low redshift AGN
We present a new determination of the optical luminosity function (OLF) of
active galactic nuclei (AGN) at low redshifts (z<0.15) based on Hubble Space
Telescope (HST) observations of X-ray-selected AGN. The HST observations have
allowed us to derive a true nuclear luminosity function for these AGN. The
resulting OLF illustrates a two-power-law form similar to that derived for QSOs
at higher redshifts. At bright magnitudes, M_B<-20, the OLF derived here
exhibits good agreement with that derived from the Hamburg/ESO QSO survey.
However, the single power law form for the OLF derived from the Hamburg/ESO
survey is strongly ruled out by our data at M_B>-20. Although the estimate of
the OLF is best-fit by a power law slope at M_B<-20.5 that is flatter than the
slope of the OLF derived at z>0.35, the binned estimate of the low redshift OLF
is still consistent with an extrapolation of the OLF based on pure
luminosity evolution.Comment: MNRAS accepted (6 pages, 6 figures
Composicao quimica e valor energetico de silagem de grao de milho para suinos.
bitstream/item/58403/1/CUsersPiazzonDocuments240.pd
Clinical activity after fingolimod cessation: Disease reactivation or rebound?
Background and purpose: There is debate as to whether the apparent rebound after fingolimod discontinuation is related to the discontinuation itself or whether it is due to the natural course of highly active multiple sclerosis (MS). Our aim was to survey the prevalence of severe reactivation and rebound after discontinuation of fingolimod in a cohort of Italian patients with MS. Methods: Patients with relapsing-remitting MS who were treated with fingolimod for at least 6 months and who stopped treatment for reasons that were unrelated to inefficacy were included in the analysis. Results: A total of 100 patients who had discontinued fingolimod were included in the study. Fourteen patients (14%) had a relapse within 3 months after fingolimod discontinuation, and an additional 12 (12%) had a relapse within 6 months. According to this study's criteria, 10 patients (10%) had a severe reactivation. Amongst these patients, five (5%) had a reactivation that was considered to be a rebound. Conclusions: The present study showed that more than 26% of patients are at risk of having a relapse within 6 months after fingolimod discontinuation. Nevertheless, the risk of severe reactivations and rebound is lower than has been previously described
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