The simple conversion of commercial pressure cookers into inexpensive anaerobic jars is described. These containers were shown to be as good as the small conventional BBL polycarbonate GasPak and large vented 150 gas-replacement jars when assessed by means of three biological indicators: Pseudomonas aeruginosa, Bacteroides melaninogenicus, and Bacteroides fragilis. Ps. aeruginosa seeded on Simmond's citrate agar was shown to be the most sensitive indicator of the three for traces of oxygen.
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