Restricting conservation and cryopreservation are two main methods of plant germplasm in vitro preservation.
限制生长保存和超低温保存是植物种质离体保存的两种主要方法。
These results indicate that bovine follicular oocytes can be frozen for long term preservation in liquid nitrogen and mature in vitro after thawing.
研究结果证明，牛卵巢卵母细胞可作超低温冷冻长期保存，解冻后可以体外培养成熟。
Objective To investigate the effects of perfluorochemical (PFC) on in vitro long-term hypothermic heart preservation in rats.
目的 研究全氟化碳化合物（PFC）在大鼠离体心脏长时程低温保存中的作用。
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