[Blood hydrolysates for microbiological culture media].

Blood hydrolysates contain two times less nucleic acids than meat hydrolysates, the levels of vitamins B2, B3, B6, and B9 are lower in them either. The authors suggest that this is the cause of a poorer growth of microorganisms in culture media with blood hydrolysates, repeatedly reported in literature. They have demonstrated that addition of nucleic acids and vitamins to blood hydrolysates improves the microorganism growth.

[Dried Escherichia diagnostic agents from live cultures].

The possibility of using selected cultures of opportunistic Escherichia, freeze-dried in a saccharose-gelatine medium, as dried diagnostic reagents. In the agglutination test with Escherichia OK diagnostic sera, both fresh and stored for a period of up to 1 year, these dried diagnostic reagents prepared from live cultures showed the same degree of agglutination as live suspensions of similar Escherichia cultures.

[Use of substances stimulating enterobacteria growth in obtaining microbial adsorbents].

The combination of substances, capable of stimulating the growth of enterobacteria and consisting of reducing agents (sodium thiosulfate and sodium sulfate), the vitamin preparation of yeast extract, polyatomic alcohol (glycerol) and ion exchange resin AB-17-8, is proposed. The addition of this combination of substances to culture media based on clots of animal blood has made it possible to achieve more intensive growth of Escherichia and Proteus than on classical meat culture media.