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- W2017388117 abstract "In chick embryos, gas exchange takes place via the chorioallantoic membrane (CAM) and the lungs at approximately 1 day prior to hatching. The present study was designed to elucidate the development of respiratory rhythms in the chick embryo during the whole pipping (perinatal) period with a condenser-microphone measuring system. The microphone was hermetically attached on the eggshell over the air cell on day 18 of incubation. It first detected a cardiogenic signal (i.e. acoustocardiogram), and then beak clapping and breathing signals (acoustorespirogram, ARG). The first signals of lung ventilation appeared intermittently and irregularly approximately once per 5 s among the clapping signals after the embryo penetrated its beak into the air cell (internal pipping, IP). The respiratory rhythm then developed irregularly, with a subsequent more regular rate. The envelope pattern of breathing from the onset of IP through external pipping (EP) to hatching was constructed by a specially devised procedure, which eliminated external and internal noises. The envelope patterns indicated that the IP, EP and whole perinatal periods of 10 embryos were 14.1±6.4 (S.D.), 13.6±4.0 and 27.6±5.4 h, respectively. In addition, they also indicated the period of embryonic hatching activity (i.e. climax) which was 48±19 min. The development of respiratory rhythm was also shown by the instantaneous respiratory rate (IRR) which was designated as an inverse value of two adjacent ARG waves." @default.
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- W2017388117 date "2002-04-01" @default.
- W2017388117 modified "2023-09-25" @default.
- W2017388117 title "Development of respiratory rhythms in perinatal chick embryos" @default.
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- W2017388117 doi "https://doi.org/10.1016/s1095-6433(02)00019-3" @default.
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