Fermentation Pilot Plan introduction oflight into the bioreactor is required. Inoue(1984)9 reported a bioreactor equipped with transparent pipes. The light was emitted from the surface of the pipe into the bioreactor. Ikeda(1985)20] reported an air-lift bioreactor equipped with a photo introducing draft tube( Fig. 25 ). The draft tube was constructed as an airtight tube which consisted of a transparent inner and outer tube. Within the center of the draft tube was a light introducing optical fiber. The light source was a sunlight collector system which operated automatically by computer control and the collected light was introduced into the bioreactor through the optical fibers. Introduction of light into the bioreactor will become an important technique for the production of specific plant metabolites SPENT MEDIUM AIRAIR MEDIUM →, SPENT MED|UM AND CELLS Figure 23. The spin filter bioreactor( Styer, 1985).Fermentation Pilot Plant 51 introduction of light into the bioreactor is required. Inoue ( 1984)[191 reported a bioreactor equipped with transparent pipes. The light was emitted from the surface of the pipe into the bioreactor. Ikeda ( 1985)[20] reported an air-lift bioreactor equipped with a photo introducing draft tube (Fig. 25). The draft tube was constructed as an airtight tube which consisted of a transparent inner and outer tube. Within the center of the draft tube was a light introducing optical fiber. The light source was a sunlight collector system which operated automatically by computer control and the collected light was introduced into the bioreactor through the optical fibers. Introduction of light into the bioreactor will become an important technique for the production of specific plant metabolites. SPENT MEDIUM MEDIUM SPIN - F I LTE RI + SPENT MEDIUM AND CELLS - SPARGER Figure 23. The spin filter bioreactor (Styer, 1985)