guanidine

guanidine thiocyanate is ideal for extracting and purifying rna of the yellow river catfish. through this method, rna of high quality had been obtained from muscle, blood, kidney, liver, ovary, which can be used for the further molecular biology research.

采取异硫氰酸胍法从黄河鲶肌肉、血液、全鱼、肾脏、肝脏、卵巢中提取出完整RNA，结果表明，通过该方法所提取RNA质量高，效果好，可以用于进一步的分子生物学研究。

Shark cartilage preparation ( SCP) was extracted from shark cartilage by the method of guanidine hydrochloride extraction, acetone fractional precipitation, and ultrafiltration.

以鲨鱼软骨为原料，经盐酸胍抽提，丙酮分级沉淀，超滤等步骤得到鲨鱼软骨制剂（sharkcartilagepreparation，SCP）。

The active-site groups of enzyme are imidazole and guanidine.

酶的能化活性基团为咪唑基及胍基。