在每个取样阶段,先在预冷的研钵(其中装有5毫升冷凝萃取液:100 mM HEPES–NaOH (pH7.6)、 8 mM MgCl2、 5 mM DTT、 2 mM EDTA、 12.5% (v/v)丙三醇以及 5% (w/v)难溶性 olyvinylpyrrolidone)中用研磨棒研磨30-40粒样品.经过4层粗棉布过滤后,再将均匀混合物12,000 克进行10分钟离心处理,清液层用于AGPase分析.根据Bradford (1976)方法采用牛血清白蛋白测量蛋白质含量.在每个取样阶段必须按照Giroux et al.(1996)前面讲述的方法进行AGPase分析.对于每种反应条件组合的3个平行样,计算出具有标准误差的平均值.每个样品的AGPase分析报告与分析时间和对原始酶样品制备时稀释有关.
At each sampling stage, 30–40 grains were homogenized with a
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