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1·Polyphenol oxidase (PPO) activity was higher in the early days of grafting.

大苗龄接穗嫁接体的PPO活性较高。

2·The properties of polyphenol oxidase extracted from aloe were investigated in this paper.

研究了芦荟多酚氧化酶的基本性质。

3·The activity of polyphenol oxidase and content of tannin were sensitive to the storage cut;

多酚氧化酶活性和单宁含量对伤害也很敏感；

4·Taken O-Methoxyphenol as the substrate, the polyphenol oxidase activity was determined by the spectrophotometry.

多酚氧化酶活性测定是用邻甲氧基苯酚为底物，用分光光度法测定。

5·There is a relationship on soil polyphenol oxidase betweenforming of soil organic matter and medium of forming humus.

土壤多酚氧化酶与土壤有机质的形成有关，是腐殖化的一种媒介。

6·Polyphenol oxidase (PPO) is a ubiquitous copper metalloprotein in the plastids of many plant species, fungi and insects.

多酚氧化酶是一类普遍存在于植物、真菌、昆虫的质体中，由核基因编码能与铜相结合的金属蛋白酶。

7·Peroxidase (POD) and polyphenol oxidase (PPO) play the important roles of longan browning in period of postharvest storage.

多酚氧化酶（PPO）和过氧化物酶（POD）是影响龙眼果实采后果皮褐变的关键酶。

8·The extracts from HPLC could react with polyphenol oxidase purified partially from betelnut and result in browning products.

其分部收集液能与已部分纯化的多酚氧化酶相互作用，形成褐变产物；

9·The enzymes activities of carboxymethyl cellulase, hemicellulase, polyphenol oxidase, guaiacol oxidase, and laccase were studied.

研究了羧甲基纤维素酶、半纤维素酶、多酚氧化酶、愈创木酚氧化酶和漆酶的酶活性变化。

10·In this paper, the characteristics of Polyphenol Oxidase from sweet potato and its control methods were studied by spectrophotometry.

应用分光光度法，研究了甘薯中多酚氧化酶的特性及褐变的控制方法。