Figure 6
From: Ultrastructure of setae of a planktonic diatom, Chaetoceros coarctatus
A schematic illustration of the morphogenesis of deep nanoholes with costae with the increasing thickness of a plate. Costae are initially arranged on the inner surface of a silica plate (a). The pores are arranged between costae (b). The depth of the nanoholes increases with increasing plate thickness (c). Several nanoholes collapse with growth of the plate to more than 1000 nm (d). Schematic illustration of the poroid arrangements (b–d) show real structures based on SEM observations. On the other hand, the initial ladder structure consisting of costae (a) is presumed from the real poroid structures.
