. Biochemical systematics. Biochemical variation; Botany. 64 BIOCHEMICAL SYSTEMATICS. Fig. 4-4. Transfer from the porphyropsin to the rhodopsin system during metamorphosis of the bullfrog. Antimony chloride tests with extracts of bleached retinas from tadpoles approaching meta- morphosis, and from newly emerged frogs. The tadpole retina contains a high concentration of vitamin A2 with only a trace of Ai, the frog retina just the reverse pattern (Wald, 1945-46). Reprinted from the Harvey Lectures by permission of the Academic Press, Inc. icant information, for tadpoles have mostly porphyropsin
. Biochemical systematics. Biochemical variation; Botany. 64 BIOCHEMICAL SYSTEMATICS. Fig. 4-4. Transfer from the porphyropsin to the rhodopsin system during metamorphosis of the bullfrog. Antimony chloride tests with extracts of bleached retinas from tadpoles approaching meta- morphosis, and from newly emerged frogs. The tadpole retina contains a high concentration of vitamin A2 with only a trace of Ai, the frog retina just the reverse pattern (Wald, 1945-46). Reprinted from the Harvey Lectures by permission of the Academic Press, Inc. icant information, for tadpoles have mostly porphyropsin with only a trace of rhodopsin, while the frogs have mostly rhodopsin. Intermediate stages exhibit mixtures (Fig. 4-4). Wald says, "It is difficult to view this [latter] phenomenon otherwise than as a ; This work is of unusual interest to biochemical systematics. In the first place, at the major systematic category level it provides modest further support for the argument that freshwater fishes are the most primitive and that they were the progenitors of amphibians. However, at the lower systematic category level it provides. 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 Alston, Ralph E; Turner, B. L. (Billie Lee), 1925-. Englewood Cliffs, N. J. , Prentice-Hall
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