The enzymes which transcribe DNA synthesizing RNA (DNA-dependent RNA polymerases) have structural differences in eukaryotic and prokaryotic cells, as indicated by the fact, among others, that there are substances which inhibit their function selectively in prokaryotic cells (streptolydigin and the ansa antibiotics, such as rifamycins and streptovaricin) and in eukaryotic cells (-amanitin). Ansa...

This study was carried out to compare the histomorphological structures of oviductal regions of the apparently healthy adult laying hens (Gallus gallus dometicus) and ducks (Ansa ansa domesticus). For this purpose, 20 hens and 20 female ducks aged between 1-1.5 years were used. After euthanasia, the oviducts were dissected out and all of the gross morphometrical parameters including length, wid...