The development and fine structure of centrifuged eggs of Chironomus thummi
[摘要] Atotalof630eggsofChironomusthummiwerecentrifugedat8000gfor10minutes,andtheirsubsequentdevelopmentwasobserved.Oftheseeggs509survived.Eggswerecentrifugedwitheithertheanteriorortheposteriorendinthecentrifugalposition.Themajorityoftheeggsdevelopednormally,butabout20%ofthetime,doubleabdomenordoublecephalonwasproduced,confirmingtheobservationsofYajima(1960).Thetwotypesofduplicationswereproducedirrespectiveoftheorientationoftheegg.Ineggscentrifugedwiththeposteriorenddirectedcentrifugally,thenumberofduplicationswastentimesasgreataswiththeoppositeorientation.Thefinestructureofthecorticalregionofnormalandcentrifugedeggswasexamined.Allthecomponentsofthisregionexclusiveoftheplasmamembraneappearedtobeshiftedbycentrifugation.Theseresultsarediscussedinconnectionwithconflictingobservationsanditisconcludedthatcytoplasmicregionscontrollingdevelopmentofbodyaxesareshiftablewithcentrifugation.
[发布日期] [发布机构]
[效力级别] [学科分类] 生物科学（综合）
[关键词] [时效性]
