Chemically defined media supplemented with precursors for synnematin production.

result from other techniques, such as those requiring aeration of cultures. The exhaust air from such operationls must be sterilized and the most reliable means of doing this is incineration. The 1 cfm capacity of the incinerator described above is sufficient for mnost laboratory scale operations. If provision is made for cooling the exit air, the apparatus may be employed as a source of sterile air which is sometimes needed for certain laboratory procedures. Although the minimum sterilizing temperature was 400 F, the incinerator is routinely operated at 500 F or above. This stipulation allows for variations which may occur in the air flow and provides a safety factor in case of power failure during operation. This operating temperature will also permit a reduction in the size of the transformer used on future models. SUMMARY A small-volume air incinerator is described which is capable of sterilizing air at flow rates up to 1 cfm. The apparatus is a resistance-type heater utilizing a 750 watt transformer and a coil of stainless steel tubing as the resistance and air channel. The incinerator can be used for sterilizing air that is contaminated by some laboratory techniques or may be used to produce sterile air for various laboratory procedures.