Osteogenesis around multiple fragments of chick embryo bone grafted to developing chick embryo chorioallantois

The Developing Chick Embryo

The RNA-P and DNA-P content of the nucleus and the RNA-P content of the whole cell of the livers of 8to 20-day chick embryos and of adult fowls have been determined. The DNA-P content of the liver nuclei was slightly higher in the 8and 10-day embryo than in all the other stages examined. A significant decrease in the RNA content of the cell occurred during embryonic development. The RNA content...

Binding of various ovotransferrin fragments to chick-embryo red cells.

1. The ability of N- and C-terminal half-molecule fragments of hen ovotransferrin to interact with chick red blood cells (CERBC) has been studied under conditions that allow binding of the transferrin to transferrin receptors to take place, but not the delivery of iron to the cell. Two kinds of half-molecule fragments were used: (a) those which can associate with one another to give a dimer res...

Glutamic dehydrogenase in the developing chick embryo.

1. The behaviour of serum albumin and yglobulin labelled with 131I has been investigated in the isolated perfused rat liver. 2. Such a liver has been found capable of preferentially removing and then breaking down very small proportions of altered protein molecules present in preparations of plasma proteins isolated by the usual methods. The proportions of such altered molecules actually presen...

Niacin biosynthesis in the developing chick embryo.

In 1945, Krehl et al. (1) observed that tryptophan and nicotinic acid were mutually interchangeable, within limits, in supporting the growth of rats. Since that time considerable evidence has accumulated which demonstrates the biosynthesis of niacin from tryptophan in the rat and other animals. Studies with Neurospora and mammals have demonstrated that the pathway from tryptophan goes through k...

Bacteriophagy in the Developing Chick Embryo.