[Survival of bacteria on zinc-coated and aluminum materials]

The survival of St. aureus. E. coli, and of salmonellae was tested without any protein error and with it on new galvanized and with disinfection disturbed plate and compared with the survival of these microorganisms on new aluminous plate which was considered to be inert. The investigation by means of the impression method lasted for seven days. The growth of the microorganisms was evaluated according to the index of their survival. A distinct oligodynamic effect of the galvanized plate was proved especially on gram-negative bacteria. The effectiveness increased by a disturbing of these plates with a long-term disinfection in a concentrated solution of chloramine BS. An antimicrobial effect was recorded also in aluminous plates disturbed by disinfection. On both kinds of plate the effectiveness was lowered by a protein error--by an adding of blood serum to the broth suspensions.