. The beginnings of embryonic development : A symposium organized by the Section on Zoological Sciences of the American Association for the Advancement of Science, cosponsored by the American Society of Zoologists and the Association of Southeastern Biologists, and presented at the Atlanta meeting, December 27, 1955. Embryology. 190 NUCLEOCYTOPLASMIC RELATIONS interest since they were able to demonstrate progressive differen- tiation in the cortical cytoplasm before nuclei had migrated into these regions. Of specific interest are the components of the cytoplasm that contain the information nec
. The beginnings of embryonic development : A symposium organized by the Section on Zoological Sciences of the American Association for the Advancement of Science, cosponsored by the American Society of Zoologists and the Association of Southeastern Biologists, and presented at the Atlanta meeting, December 27, 1955. Embryology. 190 NUCLEOCYTOPLASMIC RELATIONS interest since they were able to demonstrate progressive differen- tiation in the cortical cytoplasm before nuclei had migrated into these regions. Of specific interest are the components of the cytoplasm that contain the information necessary for direction of further devel- UV EXPOSURE (sec) 60 90 (20 150. 250 500 750 tOOO (250 1500 UV DOSE (ergs/mm^) Fig. 8. Dose-hatchability curves for Habrobracon eggs irradiated on their convex (nuclear) surfaces (O, ultraviolet; •, ultraviolet plus photo- reactivating light) or concave (non-nuclear) surfaces (A, ultraviolet; A, ultraviolet plus photoreactivating light). From von Borstel and Wolff, 1955. Proc. Natl. Acad. Sci. U. S., by permission of the University of Chicago Press. opment. We assume ultraviolet radiation can destroy the ability for progressive differentiation of regions on the periphery of de- terminate eggs. The Habrobracon egg is unique inasmuch as ultraviolet irradia- tion of the convex side of the egg kills the egg by damage to the nucleus, whereas irradiation of any other place on the egg surface. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original American Association for the Advancement of Science. Section on Zoological Sciences; Tyler, Albert, 1906-. Washington
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