Comparative studies on the ultrastructure of L forms obtained from S and R variants of Brucella suis 1330.

Electron-microscopic studies were carried out on S and R variants of Brucella suis 1330 and the production of L forms induced with the use of penicillin. No variations were established in the ultrastructure of the initial forms. However, essential differences were observed in the ultrastructure between the latter and the L-transformed Brucellae as well as changes that differentiated the ultrastructure of L forms obtained from S variants from that of L forms obtained from R variants.

The autoinhibition activity of some microbial species.

Studies revealed that during the process of their reproduction some microorganisms produce substances inhibiting the development of the own populations. A method was developed to establish the phenomenon, distinguished by its simple application and dependable results. The phenomenon was noted with the species Staphylococcus, L.