Chemistry of the chick embryo. VII. The accumulation of solids, nitrogen, lipids, and peptidase by the gizzard and liver of the chick embryo

✍ Scribed by Dumm, Mary E. ;Levy, Milton

• Publisher: Wiley (John Wiley & Sons)
• Year: 1949
• Tongue: English
• Weight: 434 KB
• Volume: 33
• Category: Article
• ISSN: 0095-9898
• DOI: 10.1002/jcp.1030330308

✦ Synopsis

THREE FIGURES

Analyses arc available for whole embryos at various stages of development (Murray, '25, '26; Needham, '31; Levy and Palmer, '40a), but analyses of individual embryonic organs are less numerous. The chemical changes recorded for whole embryos are the algebraic sums of changes taking place simultaneously in a heterogeneous system and may not reflect the differentiation of any particular organ or tissue. I n the present investigation, the liver and gizzard of chick embryos have been analyzed with the object of obtaining some chemical description of the differentiation of these Iwo organs. The data. iiiclude determinations of total solids, total lipids, nitrogen, and peptidase in the gizzard and liver of chick embryos from 5 to 20 days of incubation age.

Methods

Eggs from Rhode Island red hens were incubated at a temperature of 39" to 40°C. and at 60% to 70% relative humidity. The eggs were turned twice dailj-. The calculated age of the embryos has been estimated from their weight using Levy and Palnier's ('40a) data as the standard of reference.