A case of neonatal allo-immune thrombocytopenia due to YuKa, a new platelet specific antigen.

X-ray sources as tracers of the large-scale structure in the universe

“…The interpretation of this signal requires to model the clustering of X-ray sources around the catalogued galaxies, which is indeed modulated by the bias parameter b X . Using b X = 1, it is found that the local volume emissivity of optically selected galaxies amounts to ∼ 10 39 h erg s −1 Mpc −3 (Lahav et al 1993;Miyaji et al 1994;Carrera et al 1995), most of which is contributed by Seyfert galaxies and QSOs (Barcons et al 1995). When this volume emissivity is extrapolated to higher redshifts, the fraction of the XRB intensity due to the precursors of the catalogued galaxies can be predicted (Lahav et al 1993).…”

“…The distribution of X-ray sources in the sky should therefore exhibit an approximate large-scale dipolar distribution pointing towards the same direction. Using the AGNs in the Piccinotti et al (1982) flux-limited sample of X-ray sources (2-10 keV flux limit ∼ 3 × 10 −11 erg cm −2 s −1 ), Miyaji & Boldt (1990) and Miyaji (1994) found the dipole of these sources to point towards l = 318 • , b = 38 • with a large error circle (∼ 30 • radius). The dipole appears to saturate at 50−100 h −1 Mpc and is roughly aligned with the CMB dipole.…”