Mixtures of 1-acylmethylpyridinium halides with equimolar amounts of pyridinium halides were prepared by the Ortoleva3King reaction. The inhibiting effect of various pyridinium halides and their mixtures on corrosion of steel in sulfuric acid solutions was studied.

The use of a 1% solution of polyazolidin-ammonium modified with iodine hydrate ions (PAAG) in combination with disintegrated Yersinia pseudotuberculosis membranes made it possible to obtain hyperimmune serum with a high content of antibodies and species specificity. By the number of antibodies and the growth dynamics of their titers, PAAG was not inferior to Freund’s complete adjuvant. At the sites of injection of PAAG, connective tissue densification of the subcutaneous tissue was not observed.

A comparative assessment of the antigenic properties of dimethyl-sulfoxide fractions (DA) of Yersinia pseudotuberculosis and Yersinia enterocolitica, as well as antibodies to them. DA Yersinia pseudotuberculosis has been shown to have greater antigenic activity than DA Yersinia enterocolitica. Hyperimmune serum obtained for pseudotuberculous DA showed generic yersiniosis specificity and high antibody activity, which allows its use in diagnostic test systems.