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Link to this article: http://journals.cambridge.org/abstract_S147905050400136X How to cite this article: V. V. Tetz, V. P. Korobov, N. K. Artemenko, L. M. Lemkina, N. V. Panjkova and G. V. Tetz (2004). Extracellular phospholipids of isolated bacterial communities. A B S T R A C TWe have made a comparative analysis of the extracellular phospholipid composition of biofilms of Gram-negative and Gram-positive bacteria. The surface film of a growing bacterial community contains small membrane vesicles and a bilipid layer covering the entire surface of that community. These supracommunity films containing the bilipid layer can cover the entire surface of a Petri dish and form a boundary between bacterial communities and the environment. A mixed bacterial lawn, formed by unrelated bacteria, also becomes covered with a single film containing a lipid bilayer. The phospholipid compositions of the bacterial cell and surface film bilipid layer reflect the nature of the bacterial strains forming the community, but have some specific differences.

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New silver nanocomposites based on polysulfones of 2,2-diallyl-1,1,3,3-tetraethylguanidiniumchloride [poly(AGC-SO )], tris(diethylamino)diallylaminophosphonium tetra uoroborate [poly(DAAP-BF 4 -SO 2 )] and chloride [poly(DAAP-Cl-SO 2 )] have been developed. UVspectroscopy, SEM and XRD techniques were used to characterize the formation of silver nanoparticles in copolymers. Antibacterial action of new silver nanocomposites on S. epidermidis 33 and Escherichia coli (planktonic cells and bio lms) was studied. The silver nanocomposites strongly inhibited bio lms formation of S. epidermidis 33 and Escherichia coli. The silver nanocomposites based on phosphonium polysulfones have a signi cant cytotoxic activity against RD and MS line cells.