Observation with microcalorimetry: behaviour of P. aeruginosa in mixed cultures with S. aureus and E. coli

•Microcalorimetric experiments of P. aeruginosa with S. aureus and E. coli.•Growth profile of P. aeruginosa dominated in co-cultures with S. aureus.•P. aeruginosa and E. coli were codominant in co-cultures.•E. coli outgrew P. aeruginosa at low inoculum density of P. aeruginosa.•Microcalorimetry shown to be valuable tool for studying behaviour of mixed cultures.