存活因素 meaning in Chinese

survival factors
surviving factor

Physiological function , functional mechanisms of bifidobacterium and its applications in foods were investigated systematically by seven experiments in vitro and in vivo . they were composed of isolation and determination of bifidobacterium , comparison of growth characteristics , factors influencing survivability , bioantaganism to pathogen , adherence and colonization to mucus membrane , immunomodulation mechanisms on trial animals and development of products containing bifidobacterium
所以本课题通过体内及体外实验方法，共计七个实验，包括所研究菌的分离与鉴定；生长特性的研究；影响其存活因素的研究；对病原菌的生物拮抗：对肠粘膜的粘附与定植；对试验动物的免疫调解机理以及含双歧杆菌产品的开发，系统研究了该菌的生理功能与作用机理及其应用。