Floriana Barbera

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In females, X chromosome inactivation (XCI) begins with the expression of the XIST gene from the X chromosome destined to be inactivated (Xi) and the coating of XIST RNA in cis. It has recently been reported that this process is supported by the product of the BRCA1 tumor suppressor gene and that BRCA1-/- cancers show Xi chromatin structure defects, thus(More)
We study the evolution of the relation between half-light (effective) radius, r e , and mean surface brightness, < µ > e , known as Kormendy relation, out to redshift z = 0.64 in V-band restframe on the basis of a large sample of spheroidal galaxies (N = 228) belonging to three clusters of galaxies. The present sample constitutes the largest data set for(More)
Color gradients in early-type galaxies contain valuable clues about their formation and evolutionary histories and mechanisms. We examine color gradients in 1,700 early-type galaxies in 159 galaxy clusters spanning a redshift range of 0.05 to 0.2. We find that color gradients strongly depend on the environment where galaxies reside, with steeper color(More)
Single nucleotide polymorphisms (SNPs) of the IL28B locus are associated with a positive response to pegylated interferon-alpha and ribavirin (pegIFN-alpha/RBV) treatment of HCV-infected patients. This study evaluated the association between SNPs rs12980275, rs12979860 and rs8099917 and treatment outcome of HCV recurrent infection in HCV-positive patients(More)
We present an analysis of star-formation and nuclear activity in galaxies as a function of both luminosity and environment in the fourth data release of the Sloan Digital Sky Survey (SDSS DR4). Using a sample of 27 753 galaxies in the redshift range 0.005 < z < 0.037 that is 90% complete to M r = −18.0 we find that the EW(Hα) distribution is strongly(More)
This paper is aimed at giving an overview of the global properties of the rich cluster of galaxies ABCG 209. This is achieved by complementing the already available data with new medium resolution spectroscopy and NIR photometry which allow us to i) analyse in detail the cluster dynamics, distinguishing among galaxies belonging to different substructures(More)
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