BURGGREN W. W. Department of Zoology, University of Massachusetts at Amherst, 理学部, 教授
RAHN Hermann School of Medicine, State University of New York at Buffalo, 医学部, 終身教授
MATHIU P. M. School of Medicine, University of Hawaii at Manoa, 医学部, 助手
WHITTOW G. Causey School of Medicine, University of Hawaii at Manoa, 医学部, 教授
SUZUKI Yukinori Faculty of Engineering, Muroran Institute of Technology, 工学部, 助教授 (00179269)
|Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,900,000)
Fiscal Year 1990: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1989: ¥1,900,000 (Direct Cost: ¥1,900,000)
1. Investigations on cardiogenic minute movements (ballistocardiogram, BCG) and cardiogenic acoustic pressure (acoustocardiogram, ACG) in avian eggs.
(1) Using a microcomputer and an audiocartridge for detection of BCG, we developed the simultaneous measuring system of ECG, BCG and arterial blood pressure. It was found that in chicken eggs the BCG was attributed to not only the ventricular blood ejection, but also the ventricular isovolmetric contraction and presystole.
(2) The ACG detected by a condenser microphone was compared with the impedance-cardiogram (ICG), ECG, BCG and egg pressure in order to find origins of this signal. Some relations were found with egg pressure and ICG, but not found with the BCG, requiring further investigations.
(3) The cardiogenic ballistic movements of the egg were detected as the displacement BCG (by laser displacement meter), the movement BCG (by laser speckle meter) and the velocity BCG (by audiocartridge and piezoelectric film).
2. Non-invasive measure
ments of embryonic heart rate (f_H) in birds.
(1) The embryonic f_H was determined noninvasively by measuring the BCG during the last half of incubation period in six species of domesticated birds (quail, chick, turkey, peafowl, duck and goose) and three species of Hawaiian seabirds (albatross, shearwater and noddy), eliciting new comparative physiological knowledges.
(2) It was found that the embryonic f_H of the wild pigeon changes variously during development between individual clutches, while that of domesticated pigeons changes similarly. However, the f_H of two embryos in each clutch of the wild pigeon was found very similar. These findings suggest that genetic factors are involved in the variation of the embryonic f_H of wild birds.
3. Comparative study on the development of endothermic homeothermy was made by determining metabolic responses of embryos and hatchlings to prolonged cooling in duck, chicken, noddy and pigeon.
4. Effects of the shell diffusive conductance and altered ambient oxygen on embryonic oxygen consumption were elucidated. Less