Deposition of Biogenic Iron Minerals in a Methane Oxidizing Microbial Mat
Figure 5
Extracellular magnetosome-like features. (a) Extracellular magnetosome chains (short arrow) bound to filamentous cell envelopes. Occasionally, also intact organisms, filled with dark cytoplasm, are visible (long arrow). (b) Particles (arrows), double in size of magnetosomes close or attached to filaments. The EELS spectrum (upper left inset) shows the energy loss at the Fe L2/L3 edges. The lower right insets show a tomogram of a small section (encircled) as depicted in the lower left inset (blue: cell envelope, red: particles). The small dots represent randomly distributed colloidal gold particles (no markers) necessary for image alignment of the tilted sections. (c) Overview image showing aggregates of the particles adjacent to filamentous envelopes. (d) Aggregates of particles (arrowheads) and typical microcrystals from framboidal pyrite (arrows).
