Le developpement du plumage dorsal de l'embryon de Poulet étudié à l'aide d'irradiations aux rayons X☆
[摘要] 1.1.DeficienciesareproducedinthespinalpterylabyX-irradiationofaportionofthetrunkin212-daychickembryos.Theabnormalitiesarecharacterizedbytheabsenceofseveralrowsoffeathersandbytheformationofanapterium.2.2.Theradiodestructionofaportionofthespinalcordhasnoeffectonthespinalpteryla.3.3.Onthecontrary,radiolesionsproducedinthesomites,andconsequentlyinthedermatomes,resultinthenondifferentiationofthefeathersinpartofthespinalpteryla.4.4.X-raysslightlydelaytheepidermaldifferentiation,butdonotinterferewithitsfinalhistologicalstructure.Theyinhibitthetransformationoftheloosesubectodermalmesenchymeintodensedermis.Theresultingloosedermisisunabletoformfeathers.5.5.ThemechanismbywhichX-raysstopfeathermorphogenesisisdiscussed.Theepidermalradiolesionsarecertainlynotresponsibleforthenonindividualizationofadensedermis.X-raysmayacteitheronhypotheticalfactorsofthedensificationofthesubepidermalmesenchymalcellsorbygeneticalterationsofthesecells.
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[效力级别] [学科分类] 生物科学（综合）
[关键词] [时效性]
