CYCLIC CO2RELEASE IN DIAPAUSING AGAPEMA PUPAE
نویسندگان
چکیده
منابع مشابه
Activity of juvenile hormone acid in brainless, allatectomized diapausing cecropia pupae.
Pupal diapause in the cecropia silkmoth is terminated by activation of the prothoracic glands. Implantation of adult male cecropia corpora allata or injection of juvenile hormone-I (JH-I) or juvenile hormone-I acid (JH-I acid) causes initiation of development in debrained, allatectomized diapausing pupae. The subsequent development results in formation of second pupae or pupal-adult intermediat...
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Diapause is an important escape mechanism from seasonal stress in many insects. A certain minimum amount of time in diapause is generally needed in order for it to terminate. The mechanisms of time-keeping in diapause are poorly understood, but it can be hypothesized that a well-developed neural system is required. However, because neural tissue is metabolically costly to maintain, there might ...
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Prothoracic glands from diapausing pupae of the tobacco hornworm, Manduca sexta, synthesize markedly less ecdysone in vitro in response to prothoracicotropic hormone (PTTH) than do glands from non-diapausing pupae. Impaired steroidogenesis is also observed in glands from diapausing animals exposed to agents that enhance ecdysone synthesis in non-diapausing pupal glands by increasing intracellul...
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The cuticular hydrocarbons of diapausing pupae of the tobacco hornworm, Manduca sexta (L.), are composed of two types of hydrocarbons: n-alkanes (3%) and unsaturated hydrocarbons (97%). The integument, fat body, muscle, and hemolymph are composed of three types of hydrocarbons: n-alkanes (9, 6, 9, and 2%, respectively), branched alkanes (75, 85, 80, and 56%, respectively), and unsaturated hydro...
متن کاملHeartbeat reversal after sectioning the dorsal vessel and removal of the brain of diapausing pupae of Manduca sexta (Lepidoptera: Sphingidae)
Reversal of heartbeat was monitored in vivo by noninvasive, multisensor, thermo-cardiographic and pulse-light, optocardiographic techniques. The dorsal vessel was sectioned at the beginning, in the middle and near the end of the abdomen. Changes in the heartbeat were simultaneously monitored in both the disconnected anterior and posterior sections of the heart. The results revealed the existenc...
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ژورنال
عنوان ژورنال: The Biological Bulletin
سال: 1955
ISSN: 0006-3185,1939-8697
DOI: 10.2307/1538666