Influence of progesterone on protein and RNA synthesis in cultured chick embryo liver cells

Summary Chick embryo liver primary cultures, when added with progesterone, exhibit, in comparison with the controls, a normal growth, a decline of both³H-uridine uptake and incorporation into total RNA, a decline of³H-leucine and¹⁴C serine incorporation into the proteins. Progesterone is not able to stimulate phosvitin synthesis induction.These studies were supported in part by the Italian CNR grants.     

Acetylcholine receptors in the gastrulating chick embryo

Summary Muscarinic acetylcholine receptors are present in the gastrulating chick embryo.     

Influence of progesterone on protein and RNA synthesis in cultured chick embryo liver cells.

Chick embryo liver primary cultures, when added with progesterone, exhibit, in comparison with the controls, a normal growth, a decline of both 3H-uridine uptake and incorporation into total RNA, a decline of 3H-leucine and 14C serine incorporation into the proteins. Progesterone is not able to stimulate phosvitin synthesis induction.     

Extended survival of the chick embryo in vitro

Résumé On décrit une technique pour obtenir la survie prolongée des embryons du poulet in vitro, et son emploie pour cultiver des tissus isolés du système nerveux centrale.     

Incorporation of 5-bromodeoxyuridine in the total and ribosomal DNA of synchronously dividing chick embryo fibroblasts

The pattern of 5-bromodeoxyuridine incorporation into ribosomal DNA is quantitatively different from that for total DNA. It is concluded that 5-bromodeoxyuridine incorporation along the DNA chain is not a random process.     

Rudimentary pigmentgenesis in the pineal organ of the chick embryo

Zusammenfassung In der Epiphyse des Hühnerembryos werden, zur gleichen Zeit wie im Pigmentepithel des Auges, zahlreiche unmelanisierte, dopa-positive Grana gebildet. In der Epiphyse bleibt die Pigmentbildung auf dieser Stufe stehen, während im Pigmentepithel des Auges eine Periode intensiver Pigmentierung folgt.

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This work was supported by U.S. Public Health Service Grant No. GM 11949.