. Chemical embryology. Embryology. Days ->â 5 From these data it is simple to calculate the non-glycogen sugar in the embryo, and this is shown in Fig. 271 in its rela- tion to the free sugar in the whole egg. It is seen that the rise in free sugar in the whole egg at the end of incubation goes almost exactly parallel with the rise of non-glycogen sugar in the embryo, maintain- ing a distance of about 60 mgm. from it. Thus at hatching there are about 50 mgm. of free sugar still remaining unabsorbed in the yolk-sac and presumably to be absorbed in the first few days of post-natal life. Since
. Chemical embryology. Embryology. Days ->â 5 From these data it is simple to calculate the non-glycogen sugar in the embryo, and this is shown in Fig. 271 in its rela- tion to the free sugar in the whole egg. It is seen that the rise in free sugar in the whole egg at the end of incubation goes almost exactly parallel with the rise of non-glycogen sugar in the embryo, maintain- ing a distance of about 60 mgm. from it. Thus at hatching there are about 50 mgm. of free sugar still remaining unabsorbed in the yolk-sac and presumably to be absorbed in the first few days of post-natal life. Since the free sugar in the embryo (or, more properly, the non- glycogen sugar) rises parallel in the last 10 days with the free sugar in the egg as a whole, it is evident that the free sugar out- o side cannot be the source of the 1200^ free sugar inside, or, if it is, it must be constantly replenished from some other kind of carbo- hydrate. During this time the total carbohydrate outside (see Fig. 265) is steadily falHng, and loses indeed in the last 10 days 160 mgm., during which time the embryo gains a total of 110 mgm. The difference must be either burned or transformed into some other substance, possibly cyclose. 1 Also subsequently by Vladimirov & Danilina, whose curve is almost exactly super- imposable on that for the embryonic body in Fig. 270. Log. glycogen, they found, gives a straight line when plotted against log. age. Free glucose in whole egg o Idzumi ® Sakuragi a Averaged standard curve O Bernardi^Dastre in 1879 Non glycogen glucose in embryo o Needham. Days ^ 5 Fig. 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 Needham, Joseph, 1900-. New York: The MacMillan Co.
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