I have been studying two unknown soil isolates (one suspected to be Pseudomonas fluorescens) as part of my experimental project. They are both producing some antimicrobial compound in lag/early exponential phase, effective against Bacillus megaterium, Staphylococcus aureus and Serratia marcescens. Most information on antimicrobial compounds suggests they are produced during stationary phase, I would really appreciate any thoughts on what my isolates could be producing.