聚乙二醇6000（PEG）是一种水溶性非离子聚合物，可使蛋白质发生沉淀作用，并且其对被沉淀的蛋白质有较好的选择性；
Polyethylene glycol 6000(PEG) is a kind of water soluble and non-ionic polymer. lt can make protein to precipitate and has a better alternative to precipitation of protein.
用双缩脲反应法可以测出发酵鱼粉中水溶性总肽的含量，用凯氏定氮法可以测出被沉淀的多肽的含量，从而可以计算出发酵鱼粉中寡肽的含量。
Total solvable peptide content in the fermented fishmeal was determined by using the biuret method, and polypeptide in the precipitate by using Kjeldahl method.
许多在海里死亡的生物很快便被沉淀物掩埋。
Many organisms that die in the sea are soon buried by sediment.
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