根据冷冻保护剂能否穿人细胞将其分为两类：1．渗透性保护剂 渗透性保护剂(permeating agents)指能穿入细胞，降低溶液中溶质浓度，使进入细胞内的电解质的量减少，减轻冷冻和复温过程中细胞渗透性肿胀，减缓细胞皱缩的速度，...
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non-permeating agents 非渗透性保护剂
Cummings told CNN of a conversation he had with Sullivan on Wednesday -- before the departures of the initial three Secret Service agents were announced -- that explained the culture of pride permeating the Secret Service.
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