Figure 7
From: Insight into diatom frustule structures using various imaging techniques
TEM dark field images. Cross-section of Didymosphenia geminata frustule: (1) epoxy filling, (2) frustule, white arrowheads: Pt protection layer; (a) single rib with increased contrast to visualize the pores; (b) central area with dense layer on outside; (c) other rib shows also uneven distribution of pores; (d) central area close to stigma with some bigger pores (white arrowheads).
