Introduction: We intended to assess the accuracy of re-expressed Modification of Diet for Renal Disease (MDRD) and Cockcroft-Gault (CG) equations to estimate glomerular filtration rate (GFR) in chronic kidney disease in two different etiologies of acute renal failure (ARF): acute tubular necrosis (ATN) and acute glomerulonephritis (AGN). Methods: Patients admitted for ARF or the patients compl...

The properties of the host galaxies of a well–defined sample of 2215 radio–loud AGN with redshifts 0.03 < z < 0.3, defined from the Sloan Digital Sky Survey (SDSS), are investigated. These are predominantly low radio luminosity sources, with 1.4 GHz luminosities in the range 10 23 to 10 W Hz. The fraction of galaxies that host radio–loud AGN with L1.4GHz > 10 W Hz is a strong function of stella...

We present sensitive 870 μm continuum measurements from our ALMA programmes of 114 X-ray selected AGN in the CDF-S and COSMOS fields. We use these observations in combination with data from Spitzer and Herschel to construct a sample of 86 X-ray selected AGN, 63 with ALMA constraints at z = 1.5 − 3.2 with stellar mass > 2×10 M⊙. We constructed broad-band spectral energy distributions in the infr...

We present an analysis of 109 moderate-luminosity (41.9 ≤ log L0.5−8.0 keV ≤ 43.7) AGN in the Extended Chandra Deep Field-South survey, which is drawn from 5,549 galaxies from the COMBO-17 and GEMS surveys having 0.4 ≤ z ≤ 1.1. These obscured or optically-weak AGN facilitate the study of their host galaxies since the AGN provide an insubstantial amount of contamination to the galaxy light. We f...

We present archival high resolution X-ray imaging observations of 25 nearby LINERs observed by ACIS on board Chandra. This sample builds on our previously published proprietary and archival X-ray observations, and includes the complete set of LINERs with published black hole masses and FIR luminosities that have been observed by Chandra. Of the 82 LINERs observed by Chandra, 41 (50%) display ha...

We present the first measurement of the AGN fraction in high-redshift clusters of galaxies (z ∼ 0.6) with spectroscopy of one cluster and archival data for three additional clusters. We identify 8 AGN in all four of these clusters from the Chandra data, which are sensitive to AGN with hard X-ray (2-10keV) luminosity LX ,H > 1043 erg s−1 in host galaxies more luminous than a rest frame MR < −20 ...

In this work we explore the impact of the presence of an active galactic nucleus (AGN) on the midand far-infrared (IR) properties of galaxies as well as the effects of simultaneous AGN and starburst activity in these same galaxies. To do this we apply a multi-component, multi-band spectral synthesis technique to a sample of 250 μm selected galaxies of the Herschel Multi-tiered Extragalactic Sur...

We examine the 24 μm to X-ray color of 157 X-ray–selected AGN as a function of X-ray obscuration and optical classification in the Chandra Deep Field South. The sample consists of the Chandra hard–band detections with 2–8 keV flux > 10 erg s cm. A deep 24 μm mosaic obtained with Spitzer provides mid–infrared fluxes for the sample. Since obscured AGN locally have higher 24 μm/2–8 keV ratios than...

We explore the cosmic evolution of radio AGN with low radio powers (L1.4GHz . 5× 10 25 W Hz) out to z = 1.3 using to-date the largest sample of ∼ 600 low luminosity radio AGN at intermediate redshift drawn from the VLA-COSMOS survey. We derive the radio luminosity function for these AGN, and its evolution with cosmic time assuming two extreme cases: i) pure luminosity and ii) pure density evolu...

Heavily obscured accretion is believed to represent an important stage in the growth of supermassive black holes, and to play an important role in shaping the observed spectrum of the Cosmic X-ray Background (CXB). Hard X-ray (E>10keV) selected samples are less affected by absorption than samples selected at lower energies, and are therefore one of the best ways to detect and identify Compton-t...