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Journal of Experimental Biology 14,483-490 (1937)
Published by Company of Biologists 1937

On Phosphorus Metabolism in Embryonic Life : IV. The Parnas Reaction in the Chick Embryo from the Open Neural Fold Stage

HERMANN >LEHMANN ¹ and JOSEPH NEEDHAM ¹

¹ Biochemical Laboratory, Cambridge.

1. The chick embryo possesses the power of synthesizing creatinephosphate from phosphopyruvic acid and creatine with adenylic acid as phosphate transporter.

2. This reaction has been followed back into the early stages of development. At the 43 rd hour (approximately the beginning of cardiac activity) it is present in an unweakened state. At the 23rd hour (during the closure of the neural folds), although phosphopyruvic acid is dephosphorylated by adenylic acid, phosphagen synthesis is exceedingly weak.

3. At no age does the synthesis of argininephosphate occur in the chick embryo. The significance of this and the above facts is discussed in the text.