. Chemische Embryologie. Embryologie. Abschnitt 10 die Metabolisierung von NUCLEIN UND DER STICKSTOFFHALTIGEN EXTRAKTE Sendj Purin Basen® Embryo) O Weiß lc" "H-,,. • Eigelb/Sendju © Ganze J^Ganze, Chick] Mendel 80^Ganze, Ente jLeavenworth H WholeXFridericia) 10-1. Nuclein Stoffwechsel der Chick Embryo bereits in Abschnitt i erzählt hat (siehe S. 336), dass viele Forscher, folgenden Kossel, heute nicht in der Lage waren, Purin Basen aus dem unincu-Angehaltenem Hühnerei zu isolieren. In der heutigen Zeit ist es in der Regel vereinbart, dass nicht mehr als 2 Prozent der Gesamtmenge an Stickstoff, die zu Beginn der Entwicklung i

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. Chemical embryology. Embryology. SECTION 10 THE METABOLISM OF NUCLEIN AND THE NITROGENOUS EXTRACTIVES Sendj Purine bases ® Embryo) O White lc„„H-, , . • Yolk /Sendju ©Whole J ^ Whole, chick] Mendel 80 ^ Whole, duck jLeavenworth H WholeXFridericia) 10-1. Nuclein Metabolism of the Chick Embryo It has already been recounted in Section i (see p. 336) that many investigators, following Kossel, have not been able to isolate any purine bases from the unincu- bated hen's egg. At the present time it is generally agreed that not more than 2 per cent, of the total nitrogen at the beginning of development is in the form of purine bases. All investigators have agreed, moreover, that by the end of development purine bases are present in the embryo in considerable quantity, and there is no doubt that, during the embryonic growth of the chick, purine bases are synthesised. The only dissentient voice which breaks this unanimity is that of Mesernitzki, who maintained in 1903 that as much purine (esti- mated as xanthine) was present in the egg at the beginning as in the embryo at the end, but we may disregard it, for Fridericia. Days Fig- 343- adversely criticised his technique, and repeated his experiment with contrary results. Sendju's paper contains figures for the purine nitrogen in white, yolk and embryo, and is probably the best one with which to intro- duce the subject. As is evident from Fig. 343, there is never more than a minimal quantity of the bases in the egg-white, but in the yolk, on the contrary, there is a good deal, and on the 14th day it. 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 work.. Needham, Joseph, 1900-. New York: The MacMillan Co.

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• bookcentury1900
• bookpublishernewyorkthem
• booksubjectembryology