Fill 10g of rice into a 50ml of Erlenmeyer flask. Add 20-30ml water. Autoclave at 121℃ for 30 minutes (or fill 2g of rice into a 15ⅹ150mm tube). Add 6 ml of water. Autoclave at 121℃ for 30 minutes. (取大米10克,入50毫升椎形瓶中,水20-30毫升于15磅灭菌30分钟即成,或取大米2克,装入15ⅹ150毫米试管中,加水6毫升,于15磅灭菌30分钟。)