Enzymes adsorbed to ion exchangers are in many cases specifically desorbed by interaction with their ligands. This phenomenon has been variously called ‘specific elution with substrate’ or ‘affinity elution’ in the literature (von der Haar, 1974). Because the most effective ligands for elution are those containing charged groups identical with those on the ion exchanger (positive groups in the ...

We examine the relations linking mass, X-ray temperature and bolometric luminosity for a sample of luminous, relatively relaxed clusters of galaxies observed with the Chan-dra Observatory, for which independent confirmation of the mass results is available from gravitational lensing studies. Within radii corresponding to a fixed overdensity ∆ = 2500 with respect to the critical density at the r...