2013考研英语二图表作文预测:出生率和婴儿死亡率

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　　The leaf of A. hypogaea is enriched with polysaccharides and phenolic compounds. The polysaccharides could result in the addition of the viscosity of leaf extraction and the delay of DNA filtration. The phenolic compounds were easily oxidized, the oxides could combine with DNA and form colloidal compounds. So, these two extractions could result in the degradation of HMW DNA. In the present study, two efficient strategies were adopted to weaken the interfering of polysaccharides and phenolic compounds with HMW DNA, one was to add PVP-40 into cell lysis buffer to suppress the oxidation of phenolic compounds (Yüksel and Paterson, 2005), the other was to grow the plants under weak light to reduce the synthesis of polysaccharides and chlorophyll.