形态发生素(morphogen)，携带决定细胞分化方向相关信息的可扩散的物质。形态发生素是以连续的浓度梯度分布的，因而形成各种浓度阈值，细胞根据所处环境的形态发生素的浓度阈值决定分化方向。形态发生素是决定细胞发育的基因表达产物，如果蝇中的合子基因。
芫菁雄虫羽化后0 ~ 30天无论在形态还是斑蝥素合成量方面都发生了显著变化。
Male blister beetle undergo significant changes in morphology and cantharidin content during the 0-30 days after eclosion.
结论糖尿病可导致大鼠海马突触数量减少、形态结构发生显著变化，早期应用胰岛素治疗可预防、延缓病变。
Conclusion There are significant changes in hippocampus' synapses of diabetic rats and early use of insulin could delay the occurrence of neuropathological changes.
结果表明，液氮处理后纤维素的侧序分布、结晶度、微晶尺寸、晶格形态都发生深刻的变化。
The resultsshowed that after the treatment of cellulose with L-NH3, the lateral order distribution, crystallinity, crystallite size and lattice form of cellulose were dramatically changed.
应用推荐