Figs 24–27 in On the Nature of Tintinnid Loricae (Ciliophora: Spirotricha: Tintinnina): a Histochemical, Enzymatic, EDX, and High-resolution TEM Study

Figs 24–27. Transmission electron micrographs of a lorica surface in Eutintinnus angustatus at middle (24) and higher (25–27) resolution. 24 – crystal lattice; 25 – digitally enlarged detail of Fig. 24 (bottom part). The periodicity of the hexagonal structures amounts to ~ 23.7 nm with a resolution of ~ 3 nm for the smallest details; 26 – fast Fourier transform of Fig. 25; 27 – noise filtered bright field image after inverse Fourier transform of Fig. 26, using only the diffraction spots. Due to the enhanced contrast, the ultrastructure of the crystal lattice appears more distinct.