The vitro characteristics of PVY in Henan Province were studied by biological methods.

用生物学方法研究了河南烟草马铃薯Y病毒(PVY)的体外特性。

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Up to now, there are two main Hydrogen production methods-chemical and biological methods.

目前生产氢气的方法主要有化学制氢法和生物制氢法两大类。

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Methods The sterilization quality was monitored by physical, chemical and biological methods.

方法：采用物理、化学、生物方法，对其灭菌质量进行监测。

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They cannot be understood, still less shaped, by physical and biological methods alone.

UNESCO: Post-Conflict and Post-Disaster Responses