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. 2018 Jun 14;9:1252. doi: 10.3389/fmicb.2018.01252

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Copyright © 2018 Stranghoener, Schippers, Dultz and Behrens.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Scanning electron micrographs of biotic and abiotic incubation experiments with HSDP2 core samples (A–F: biotic experiments; G–I: abiotic experiments). (A) Single cell with small particles adhering to its surface. (B) Clusters of cells connected by filamentous structures. (C) Altered glass surface with possible imprints of microbial cells. (D) Basaltic flow (BF2) showing basaltic glass (left) and olivine crystal (right). (E,F) Enlargement of the areas indicated in image (D). Glass (E) is intensively colonized by cells of B. fungorum whereas cells are absent on olivine surfaces (F). (G) Abiotic altered glass surface covered with alteration products. (H) Small particles cemented in mesh-like alteration products. (I) Porous spherical structures in a primary vesicle.