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Schematic diagrams of: a BCB and b HB. 1 growth vessel, 2 immobilization basket, 3 air humidifier, 4 air pump, 5 immobilization system (details presented in Fig. 2), 6 medium reservoir, 7 peristaltic pump, 8 medium drain, 9 cartridge with XAD-2 resin (in situ extraction experiment only)
