Abstract: A method of producing a biofilm-like microorganism-polymer complex, the method comprising the step of exposing, in an aqueous medium, cells of a microorganism to a polymer comprising groups as defined by formula (la) or formula (lb), wherein: Y comprises an imine; and R2 comprises a CI-30 group. A biofilm-like microorganism-polymer complex comprising cells of a microorganism and a polymer comprising groups as defined by formula (la) and/or formula (lb). A method for producing a chemical and/or biological product using the microorganism-polymer complex, and the chemical and/or biological products obtained therefrom. A method of dispersing the microorganism-polymer complex. Polymers of formula (la) and of formula (lb).