The acceleration of ribonucleic acid synthesis in cleaving sea urchin embryos☆
[摘要] TheincorporationofguanosineintoGTPandRNAhasbeenmeasuredinunfertilized,fertilized,andcleavingeggsoftheseaurchin,Strongylocentrotuspurpuratus.Atallstagesexamined,guanosineisconcentratedfromtheseawaterandconvertedtoGTP.Usingthemethodsdescribed,thereislittledetectableincorporationofisotopeintoRNApriortofertilization,noristhereanydetectablechangeinincorporationfollowingfertilization.Detectableincorporationispresent,andsynthesisofRNAisintenseafterthethirdcleavagedivision.RNAsynthesiscouldoccurpriortothistime,butatratesprobablylessthan10%thatatthe16-cellstage.Hence,thereisaconsiderablechangeinrateofnetRNAsynthesisshortlyafterthethirdcleavagedivision.
[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]
