In vivo rupture of the imidazole ring of histamine

Zusammenfassung Es wird gezeigt, dass Histamin auch durch das Aufreissen des Imidazolringes im Vormagen von Schafen katabolisiert werden kann. C¹⁴-markiertes Histamin wurde in den Pansen des Schafes oral eingeführt und annähernd 30% davon in der Atmungsluft (CO₂) aufgefangen.     

Germ cell colonization of gonads in experimental quail twin embryos (Coturnix coturnix japonica)]

At the same development stage, two Quail twin embryos from right and left halves of a blastoderm contain together as many germ cells as a normal embryol. These are asymmetricaly distributed between the twins as between the right and left genital ridges of control embryos.     

Effect of hormones on adenyl cyclase activity of rabbit mammary gland in vitro

Ovarian hormones namely beta-estradiol and progesterone were observed to stimulate the activity of adenyl cyclase of the mammary gland from pregnant rabbit in vitro, unlike the lactating tissue where it was inhibited. On the other hand, non-ovarian hormones like hydrocortisone, prolactin and insulin did not have a similar effect on this enzyme.