Evidence from electron micrographs for the passage of material through pores of the nuclear membrane.

摘要: 1. The nurse cells of Rhodnius possess nucleoli that stain with Heidenhain's hematoxylin but give a negative Feulgen reaction. In localized positions adjacent to the nuclear membrane are seen masses material both within nucleus and adjoining cytoplasm hematoxylin, but, like nucleolus, 2. Electron micrographs reveal contain pores approximately 400 A in diameter. 3. electron nucleolus is be composed reticulum containing tightly packed granules. Between centrally located observed relatively small bunches granules same relative size as those occurring nucleolus. Aggregated at certain irregularly shaped Certain these continuous through narrow isthmuses extending membrane. Other show evidence preparing enter by projecting tongues toward into them. pear-shaped front contact which suggests they were fixed process or just after completing passage pores.