Department of Physics, The Ohio State University, 191 W Woodruff Ave., Columbus, Ohio 43210, USA.
School of Environment and Natural Resources, The Ohio State University, 2021 Coffey Rd., Columbus, Ohio 43210, USA.
Phys Rev E. 2017 Jun;95(6-1):062612. doi: 10.1103/PhysRevE.95.062612. Epub 2017 Jun 30.
Magnetotactic bacteria are a group of motile prokaryotes that synthesize chains of lipid-bound, magnetic nanoparticles called magnetosomes. This study exploits their innate magnetism to investigate previously unexplored facets of bacterial hydrodynamics at surfaces. Through use of weak, uniform, external magnetic fields and local, micromagnetic surface patterns, the relative strength of hydrodynamic, magnetic, and flagellar force components is tuned through magnetic control of the bacteria's orientation. The resulting swimming behaviors provide a means to experimentally determine hydrodynamic parameters and offer a high degree of control over large numbers of living microscopic entities. The implications of this controlled motion for studies of bacterial motility near surfaces and for micro- and nanotechnology are discussed.
趋磁细菌是一类能够合成链状的脂结合磁性纳米颗粒（即磁小体）的能动原核生物。本研究利用其固有的磁性，来研究以前在细菌表面水动力领域中尚未探索的方面。通过使用弱的、均匀的外加磁场和局部的、微小的表面图案，通过控制细菌的取向，对细菌的方向进行磁控制，从而可以调节水动力、磁和鞭毛力分量的相对强度。由此产生的游动行为为实验确定水动力参数提供了一种手段，并对大量活体微观实体提供了高度的控制。本文讨论了这种受控运动对细菌在表面附近运动的研究以及对微纳技术的意义。
