| 摘要 |
PURPOSE:A fermentor for aerobic microorganisms, having a telescopically extendable draft tube in the fermentor, by which amount of the cultivation medium can be precisely controlled by adjusting the length of the tube and the cultivation can be conducted under optimum condition. CONSTITUTION:A multi-component draft tube 3 which can be telescopically extended with a handle 1 is attached to the bottom of a fermentor for aerobic micro- organisms. At the initial stage of the cultivation when the level of the cultivation medium is still low, the draft tube is contracted; while as the cultivation proceeds and the level of the medium is raised, the tube is extended above the level of the medium. The extendable draft tube of this invention can be applied to the fermentor having fixed fraft tube, such as waldhof fermentor, DIC-1-type air-lift fermentor, etc.
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