Abstract: A surface deposition or surface treatment reactor, in particular for chemical vapor deposition, has an annular reaction chamber (C.sub.R) delimited by two tubular walls (1, 2), in particular of quartz. A first hearing unit is arranged inside the tubular wall (1) and a second heating unit is arranged around the outer tubular wall (2). Said units are controlled by heat-regulating means in order to ensure a predetermined longitudinal temperature profile in the reaction chamber (C.sub.R). The gas phase is distributed at a longitudinal end of the chamber (C.sub.R) through distribution ducts (18) and removed by suction at the other end through pumping ducts (20). The substrates (S), which may be very numerous, are swept simultaneously by the gas phase and the perfect control of the temperature distribution and of the flow makes it possible to obtain a uniform treatment of the desired type which is identical for all the substrates.

Abstract: A method for allowing biological macromolecules contained in a solution to be separated by selective absorption comprising supplying with a solution each stage (3, 4) of a column containing a selective chromatographic resin specific to the macromolecules to be separated, so as to fluidize the beds of resin at each stage, each stage being provided at its base with a perforated distribution system (5) characterized by a percentage of open sections between 0.2% and 10%, a mean diameter of the said open sections greater than approximately 300 microns and between 2G.sub.m and 20G.sub.m, where G.sub.m is the mean granulometry of the resin.