Then, 1000ml natural seawater (NSW) was added to boil for 30min and was filtered through two layers of cheesecloth.Potato extract was collected and the remainder was discarded.

• 但是土豆的使用方法是：应用海水将切好的土豆块煮沸30分钟，然后滤掉残渣，取土豆汁做培养基。