1. Ultrastructure of the Ca–P-rich bodies.
Ultrastructure of the Ca–P-rich bodies. (A) CryoSEM image of a freeze-fractured P. carterae cell with the Ca storage compartment (*) cut open, showing two Ca–P-rich bodies (in rectangles). (B and C) Higher-magnification images of the framed areas in A showing Ca–P-rich bodies and the nearby compartment membrane (arrowheads). The contrast of the membranes is different from that of the material surrounding them. The boundary of the Ca–P bodies does not show a membrane-characteristic contrast pattern, suggesting the body material to be in direct contact with the compartment solution. (Insets) The corresponding backscattering images in which the brightness of the Ca–P bodies corresponds to their richness in calcium. The membranes are bright due to the steep topography.
Assaf Gal et al. PNAS doi: /pnas
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