(1,3-dioxolan-2-yl-methyl)-1H-imidazoles as bactericidal and/or fungicidal agents

Compounds of the formula:

• ##STR15## in which Q is N or CH;
• Ar is a member selected from the group consisting of phenyl and substituted phenyls having from one to three substituents, each substituent being independently selected from the group consisting of halo, lower alkyl and lower alkoxy groups;
• --AA-- is a divalent radical of a natural amino acid forming part of the structure of proteins or a diacyl radical originating from a substituted or unsubstituted alkanedioic or alkenedioic diacid containing from 3 to 10 carbon atoms wherein when --AA-- is a divalent radical of a natural amino acid having an additional functional group selected from the group consisting of --OH, --NH.sub.2 and --COOH, said additional functional group may be protected or unprotected, and wherein when --AA-- is a divalent radical of an amino acid, the divalent radical --AA-- is attached to the piperazine radical ##STR16## at its C-terminal end;
• n is an integer from 0 to 4 inclusive;
• and
• X is H, OH, Y, ##STR17## in which when n is equal to 1, 2, 3 or 4, Y is then a hydrocarbon radical selected from the group consisting of alkyl, alkenyl and alkynyl groups having from 1 to 20 carbon atoms, and
• when n is equal to 0, Y is then a hydrocarbon radical selected from the group consisting of alkyl, alkenyl and alkynyl groups having from 7 to 20 carbon atoms;
• and pharmaceutically acceptable salts and isomers of these compounds.