L'utilisation de nucléosides dans l'ovaire du Grillon et ses variations au cours de l'ovogenèse: I. Incorporation dans l'ARN

[摘要] 1.1.Thispaperdescribestheutilizationoftwotritiatednucleosides(uridineandcytidine)bytheRNAofthecricketovaryintermsofthedurationofincorporationandofthephysiologicalconditionofthefollicles.2.2.ConcerningRNAmetabolisminthefolliclecells,weobservethatthechromosomesaretheprimarysiteofRNAsynthesis.Astheincorporationtimeprogresses,thelabeledRNAmovestothenucleoluswhereitaccumulates.Afterward,theradioactivityreachesthecytoplasm.Thenucleolilosetheirlabeledmaterialwhenthecytoplasmicactivityismaximal.Thespeedofthemigrationfromthenucleustothecytoplasmdependsonthesecretoryactivityofthefolliclecells:themoreimportanttheactivity,theshorterthediffusiontime.ThisfactsupportsthehypothesisthatthelabeledRNAofthenucleusreleasedtothecytoplasmis“messengerRNA.”3.3.Intheoocyte,theuptakeofuridineandcytidineisatfirstvisibleinthenuclearsap.Lateron,thelabeledRNAaccumulatesinthechromosomesandintheooplasm.Althoughitisveryhighduringcytoplasmicgrowth,theRNAactivitydropssoonafterthebeginningofvitellogenesis.

[学科分类] 生物科学（综合）