Andries J C
Eur J Cell Biol. 1983 Mar;30(1):54-9.
In ultrathin sections and freeze-fractures in hexagonal nuclear pore arrangement is described in midgut epithelial cells of Dytiscus marginalis. The majority of the pores is concentrated in several cup-like indentations of the nuclear envelope and the pore center-to-center distance is about 130 to 140 nm. In addition, in the regions of the nuclear pore clusters, patches of cytoplasm containing paracrystalline structures of closely packed hexagons of 18 to 20 nm width are found sandwiched between the nuclear envelope and a "secondary" envelope. In such areas, structures are commonly observed that suggest transfer of material from the nucleus to the cytoplasm, sometimes in a dumb-bell-shaped state and more often as slender filaments which migrate across the nuclear pores.
在龙虱中肠上皮细胞的超薄切片和冷冻断裂中，描述了六边形核孔排列。大多数核孔集中在核膜的几个杯状凹陷处，孔中心到中心的距离约为130至140纳米。此外，在核孔簇区域，发现夹在核膜和“次级”膜之间的细胞质斑块含有宽度为18至20纳米的紧密堆积六边形的准晶体结构。在这些区域，通常观察到一些结构，表明物质从细胞核转移到细胞质，有时呈哑铃状，更多时候是呈细长的细丝穿过核孔。
