外源因子 meaning in English

adventitious agents extraneous agents
ef

Effects of exterior factors on browning of storage orange juice
外源因子对贮藏橙汁色泽影响研究
The aim of this thesis was to investigate the development , distribution , properties and metabolic factors of digestive enzyme in alimentary tract by means of methods of enzymatic biochemistry and molecular biology , which provided theoretic evidence for formulation of feed and nutritional requirement in tilapia
罗非鱼具有优良的生长特性和饲料利用能力，本文采用酶学和分子生物学的研究技术，对罗非鱼消化酶的特性、分布和活性变化规律以及与外源因子的相互关系进行了系统研究。