Control Characteristics of Magnetotactic Bacteria: Magnetospirillum Magnetotacticum Strain MS-1 and Magnetospirillum Magneticum Strain AMB-1
Control Characteristics of Magnetotactic Bacteria: Magnetospirillum Magnetotacticum Strain MS-1 and Magnetospirillum Magneticum Strain AMB-1
复制标题
趋磁菌：趋磁磁螺菌MS-1和磁磁螺菌AMB-1的防治特性
DOI：
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发表时间：
2014
影响因子：
2.1
通讯作者：
S. Misra
中科院分区：
文献类型：
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作者：
I. Khalil;S. Misra
趋磁细菌有可能执行非平凡的任务，如微驱动，微操作和微组装，在受控磁场的影响下。这些磁性微生物的闭环控制特性取决于它们的自推进力（运动性）和磁偶极矩。这些特性可以通过趋磁细菌的生长条件来控制。我们提供了两种趋磁细菌，即，Magnetotacticum菌株MS-1和Magnetotacticum菌株AMB-1。这种比较包括表征其形态，磁偶极矩，和闭环控制特性的瞬态和稳态。本文报道了M. magnetotacticum和M.在7.9mT的磁场下，两种菌株的平均吸光度分别为1.4 × 10 ~（-16）A.m2和1.5 × 10 ~（-17）A.m2。这些磁偶极矩用于实现每种细菌菌株的闭环控制系统。闭环控制系统实现了M.在23 ± 10 μ m（约4个体长）的会聚区内，M.磁应变的平均速度为30 ± 12 μm/s（约每秒8个体长），平均会聚区域为35 ± 14 μm（约14个体长）。这些结果提示，M. magnetotacticum菌株比M.磁应变
Magnetotactic bacteria have the potential to execute nontrivial tasks, such as microactuation, micromanipulation, and microassembly, under the influence of the controlled magnetic fields. Closed-loop control characteristics of these magnetic microorganisms depend on their self-propulsion forces (motility) and magnetic dipole moments. These properties can be controlled through the growth conditions of magnetotactic bacteria. We provide a comparison between two species of magnetotactic bacteria, i.e., Magnetospirillum magnetotacticum strain MS-1 and Magnetospirillum magneticum strain AMB-1. This comparison includes the characterization of their morphologies, magnetic dipole moments, and closed-loop control characteristics in the transient and steady states. The characterized average magnetic dipole moments of motile cells of M. magnetotacticum and M. magneticum strains are 1.4 × 10-16 A.m2 and 1.5 × 10-17 A.m2 at a magnetic field of 7.9 mT, respectively. These magnetic dipole moments are used in the realization of closed-loop control systems for each bacterial strain. The closed-loop control systems achieve point-to-point positioning of M. magnetotacticum cells at an average velocity of 32 ± 10 μm/s (approximately seven body lengths per second), and within an average region of convergence of 23 ± 10 μm (approximately four body lengths), while cells of M. magneticum strain are positioned at an average velocity of 30 ± 12 μm/s (approximately eight body lengths per second), and within an average region of convergence of 35 ± 14 μm (approximately 14 body lengths). These results suggest that the cells of M. magnetotacticum strain have a slightly greater tendency to provide desirable closed-loop control characteristics than cells of M. magneticum strain.
影响因子：
3.4
作者：
H. Berg
通讯作者：
H. Berg