Abstract: The photometer for automatic sample analysis comprises an optical bench emitting a measuring lightbeam, a series of transparent cells containing the samples for analysis and for sucessive presentation in the beam and result recording and processing means. A set of rectilinear presentation means each supporting a juxtaposed row of cells is arranged in parallel side by side in a magazine. Means for selecting and extracting each presentation means successively from the set of the latter are provided. A movable carriage supports the optical bench with means for moving said carriage at reading speed parallel to the row of cells selected such that the measuring beam of the bench sucessively traverses each cell of said row.

Abstract: An aqueous solution in a neutral medium of the tuberculoprotein C is subjected to the action of an ionized substance before carrying out three different separation processes which consist in bringing the tuberculoprotein C into solution in water in a proportion of 5% by weight and in neutralizing. The first process consists in adding the ionized substance in an alcohol medium and in carrying out ultracentrifugation for two hours at 40,000 g in order to obtain tuberculoproteins CA in the form of a supernatant liquid. The second process consists in adding a solution of the ionized substance, in carrying out ultrafiltration, concentration and precipitation with trichloroacetic acid in order to obtain the tuberculoprotein CB. The third process consists in adding a solution of the ionized substance then gel-filtering in order to eliminate the molecules having a molecular weight above 200,000 g and in precipitating with trichloroacetic acid in order to obtain a tuberculoprotein CC.