Trichloroethene degradation in a two-step system by methylosinus trichosporium OB3b. Optimization of system performance : Use of formate and methane - Beenackers, A. A. C. M.; Ganzeveld, K. J.; Janssen, D. B.; Koning, W. de.; Sipkema, E. M.; Vlieg, J. E. T. Van Hylckama.