First, a nested transaction model based on functional alterative tasks is given by analyzing the characteristics of real-time transactions in mobile distributed environment.

首先，通过分析移动分布环境中实时事务的特点给出了一个基于功能替代的移动实时嵌套事务模型。

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DNA was extracted from microorganisms in the water at 7-week and continued hunger 2-week. Nested PCR was used to detect whether GM soybean was flow in microorganisms from cultured environment.

在投喂转基因饲料7周以后以及停止投喂饥饿2周以后分离水体中的微生物，提取其DNA，进行转基因检测。

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