Bacterial Adhesion/drug effects; Culture Media, Conditioned/pharmacology; Rhodococcus/chemistry; Surface-Active Agents/pharmacology; Aspergillus niger/drug effects; Aspergillus niger/physiology; Bacillus subtilis/drug effects; Bacillus subtilis/physiology; Candida albicans/drug effects; Candida albicans/physiology; Dose-Response Relationship, Drug; Enterobacter cloacae/drug effects; Enterobacter cloacae/physiology; Erwinia/drug effects; Erwinia/physiology; Escherichia coli/drug effects; Escherichia coli/physiology; Fusarium/drug effects; Fusarium/physiology; Proteus vulgaris/drug effects; Proteus vulgaris/physiology; Pseudomonas aeruginosa/drug effects; Pseudomonas aeruginosa/physiology; Rhodococcus/metabolism; Staphylococcus aureus/drug effects; Staphylococcus aureus/physiology; Surface Properties; Surface-Active Agents/isolation & purification; Surface-Active Agents/metabolism