A summary study of direct and indirect radiation damage upon the developing ear in <i>Amblystoma</i>

Piatt, Jean

doi:10.1002/jez.1401560309

J. Exp. Zool.

1964

DOI: 10.1002/jez.1401560309

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A summary study of direct and indirect radiation damage upon the developing ear in Amblystoma

Jean Piatt

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1966

1969

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Cited by 3 publications

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Dissociability of developmental processes in the morphogenesis of the ear in Ambystoma, as revealed by X‐ray damage

Piatt

1968

Anat. Rec.

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Eggs of Ambystoma maculatum from the same clutch were separated at Harrison's stage eight into three groups and maintained at So, 14" and 2OoC, respectively, until stage 28. At these three temperatures the respective number of hours between stages eight and 28 were 291, 171, 99. Half of each group was then x-irradiated with 600 r and the right ear vesicle substituted for that of the non-irradiated complement. Subsequent development of the irradiated grafts, a l l reared at 20"C, was compared among the groups. Within the range of temperatures employed, hypothermia alone has no effect upon final ear development; every left ear in all groups developed normally. Developmentl of irradiated grafts in the 8" group is decidedly more abnormal than in either 1 4 ' or The data demonstrate that the chronologically older ear is more radiosensitive t h a n the younger, despite morphological panty among groups at time of irradiation. This suggests that prolonged hypothermia may dissociate in time the invisible or biochemical processes of development from the purely morphological; the pace of the former is less retarded than the latter.

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Dissociability of developmental processes in the morphogenesis of the ear in Ambystoma, as revealed by X‐ray damage

Piatt

1968

Anat. Rec.

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X‐irradiation of lateral‐line primordia in Amblystoma

Piatt¹

1966

J. Exp. Zool.

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Embryos of Amblystoma punctatum were x‐irradiated with 500 r to 2,000 r at stages 28–30. A rectangle of ectoderm including postauditory placodal material was transplanted orthotopically from the right side of irradiated embryos to nonirradiated hosts of the same age. Controls consisted of the same operation between non‐irradiated embryos. Animals were studied at stage 46 to determine the effects of irradiation upon development of lateral‐line migratory primordia, nerves and ganglion.The dorsal lateral‐line was most affected by irradiation, averaging approximately 90% less organs and 85% less nerve fibers than normal. Midbody lateral‐line averaged approximately 65% less organs and 55% less nerve fibers. There was no reduction in number of ventral lateral‐line organs and scarcely any in number of nerve fibers. Number of lateralis ganglion cells averaged approximately 62% less than normal. Control animals developed normal numbers of organs and nerve fibers in all three lateral‐lines and showed no appreciable reduction of ganglion cells on the operated side.X‐irradiation affects the migration of lateral‐line primordia as well as the proliferation or maturation of Xth lateralis nerve cells. Normality of the ventral lateral‐line in these experiments requires further investigation.

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Development of Transplanted Imaginal Disks in X-irradiated Housefly Pupae

Bhaskaran

Sivasubramanian

1969

Nature

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A summary study of direct and indirect radiation damage upon the developing ear in Amblystoma

Cited by 3 publications

References 11 publications

Dissociability of developmental processes in the morphogenesis of the ear in Ambystoma, as revealed by X‐ray damage

Dissociability of developmental processes in the morphogenesis of the ear in Ambystoma, as revealed by X‐ray damage

X‐irradiation of lateral‐line primordia in Amblystoma

Development of Transplanted Imaginal Disks in X-irradiated Housefly Pupae

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