Biochemical and histological changes in the respiratory system of Rana catesbeiana larvae during normal and induced metamorphosis☆
[摘要] Theincorporationofaminoacidsandthymidineintolungsandgillsofbullfrogtadpoleswerestudiedduringnormalandthyroidhormone-inducedmetamorphosis.Duringnormalmetamorphosisbothaminoacidandthymidineincorporationintogilltissuedecreaseduringthelatemetamorphicstages.Duringthistimeperiod,histologicalstudiesshowareductioningillvascularityandanincreaseinthenumberofmelanocytesrelativetogillepitheliumcells.Theratesofaminoacidandthymidineincorporationintothelungsinthelatemetamorphicstagesaremuchhigherthaninyoungtadpoles.Thelunghistologyshowsanincreaseinthepotentialrespiratoryepitheliumbyanincreaseinthenumberandsizeofseptaduringthelatermetamorphicstages.Thyroidhormoneadministrationtoyoungtadpolesmimicsthebiochemicalchangesobservedduringnormalmetamorphosisbutdoesnotleadtothesamemorphologicalchangesasobservedduringnormalmetamorphosis.Thediscrepanciesbetweennormalandinducedmetamorphosisarediscussed.
[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]
