Abstract: An extracellular exopolymer endowed with immunomodulating properties is prepared by culturing the Bifidobacterium infantis longum strain deposited at the Institut Pasteur under No. I-885 in a suitable medium under anaerobic conditions. After the microorganisms are discarded from the culture medium, the exopolymer thus produced is isolated, concentrated and then precipitated by adding an organic solvent; finally the product resulting from the precipitation is lyophilized.The exopolymer thus obtained possesses an activity on cellular as well as on humoral immunity, and could thus be used as an immunomodulating agent in any potential therapeutic application.

Abstract: Synthetic magnesium aluminosilicate consisting essentially by weight of 47-57% SiO.sub.2, 9-11% Al.sub.2 O.sub.3, 3-5% MgO, 1-3% CaO, and less than 5% Na.sub.2 O, balance water to total 100% calculated analytically.A process for manufacturing, comprising the steps ofstirring into a first aqueous solution, containing the corresponding amounts of magnesium sulfate and aluminum sulfate, a second aqueous solution containing sodium silicate and sodium hydroxide.thereafter adding a third aqueous solution containing a corresponding amount of calcium chloride,continuing the stirring,filtering off and washing the precipitate, anddrying the precipitate at a temperature below 100.degree. C.,or, instead of adding the third aqueous solution containing calcium chloride, by using lime water in the manufacturing process and for washing.

Abstract: Lysates derived from strains of Escherichia coli, especially wherein said lysates are derived from at least one of the strainsNCTC 8603, 8621, 8622, 8623, 9026, 9111, 9119, 9707, 9708,I-081, I-082, I-083, I-084, I-085, I-086, I-087, I-088, I-089are useful for treating rheumatoid arthritis.

Abstract: Diethylamine persilate of formula ##STR1## can be used against gastric and duodenal ulcers.