The factors which influenced somatic embryogenesis and plantlet regeneration in Picea meyeri Rehd. et Wils. were studied in order to establish a high frequency embryogenetic system.
摘要为建立白杄体细胞胚胎发及其植的频系统,对聚乙二醇及干化处理的影响进行了系统研究。
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A study conducted at Washington University found that rats not only enjoy being tickled, but high frequency recordings showed that they actually make the same laughing sound during a good tickle session than when they play with other rats.
华盛顿大学一项研究发现,老鼠不仅喜欢被挠痒痒,而且高率录音表明,它们挠痒痒时候,它们发出笑声和与其他老鼠玩耍时发出笑声是一样。