Lherbette Marion, Regeard Christophe, Marlière Christian, Raspaud Eric
Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, 91405 Orsay, France.
Institute for Integrative Biology of the Cell (I2BC), Université Paris-Saclay, CEA, CNRS, 91198 Gif-sur-Yvette, France.
ACS Cent Sci. 2021 Nov 24;7(11):1949-1956. doi: 10.1021/acscentsci.1c01126. Epub 2021 Nov 9.
Stability and reactivity of solid metal or mineral surfaces in contact with bacteria are critical properties for development of biocorrosion protection and for understanding bacteria-solid environmental interactions. Here, we opted to work with nanosheets of iron nanolayers offering arbitrarily large and stable areas of contact that can be simply monitored by optical means. We focused our study on the sediments' bacteria, the strain MR-1, that served as models for previous research on electroactivity and iron-reduction effects. Data show that a sudden uniform corrosion appeared after an early electroactive period without specific affinities and that iron dissolution induced rapid bacterial motions. By extending the approach to mutant strains and three bacterial species, we established a correlation between corrosion onset and oxygen-depletion combined with iron reduction and demonstrated bacteria's extraordinary ability to transform their solid environments.
与细菌接触的固体金属或矿物表面的稳定性和反应性是生物腐蚀防护发展以及理解细菌与固体环境相互作用的关键特性。在此，我们选择使用铁纳米层纳米片，其提供了任意大且稳定的接触面积，可通过光学手段简单监测。我们的研究重点是沉积物细菌MR - 1菌株，该菌株是先前关于电活性和铁还原效应研究的模型。数据表明，在早期无特定亲和力的电活性期后出现了突然的均匀腐蚀，并且铁溶解引发了细菌的快速运动。通过将该方法扩展到突变菌株和三种细菌物种，我们建立了腐蚀起始与氧消耗以及铁还原之间的相关性，并证明了细菌改变其固体环境的非凡能力。
