1a shows the amounts of BC production from various car-bon sources. After 7 days incubation, the production of the BC wasconfirmed from three media. However, more BC cultured in mediaZhou (Z) and Hestrin-Schramm (H) was produced, respectively.Moreover, it was confirmed that G. xylinus could not produce BCin the medium consisting of Yamanaka (Y). The nitrogen sourcessuch as yeast extract and pepton were indispensable for the cell