Study on magnetic analyses by magnetotactic bacteria

为了阐明趋磁细菌的精细磁性结构，对趋磁细菌的应用研究取得了以下结果。1.球菌型趋磁细菌向S极或N极迁移，而芽孢杆菌和芽孢杆菌型则沿磁场线向N极和S极的两个方向沿着迁移。2.在标准河流、湖泊和磅的淤泥表面发现了趋磁微生物。球菌型分布于南极洲的海洋中。3.在显微镜下用球型法观察了FeNi颗粒、磁铁矿和磁铁矿磁性颗粒上N、S极的分布。4.用球菌型法观察了钴铬合金涂层磁带表面的位分布。5.通过螺旋型观测到间隔为10 μ m的磁力线和磁场梯度。6.对于获得饱和剩磁的样品，矫顽力可以用cocci型来测量，细菌迁移力、细菌与环境磁场的相互作用以及布朗运动的定量分析还有待进一步研究。

Following results have been obtained by the applicative study of magnetotactic bacteria in order to elucidate the fine magnetic structures. 1. Cocci type magnetotactic bacteria migrates toward the S or N poles, but bacci and spirilla types migrate toward both directions of the N and S pole along the magnetic field line. 2. Magnetotactic microorganisms were found in mud surface of the standard river, lake and pound. The cocci type was found in ocean under the geomagnetic pole, Antaractica. 3. Distribution of the N and S poles was observed using the cocci type on the magnetic grains of FeNi grains, magnetite and pyrrohtite under the microscope. 4. Distribution of bits were observed by the cocci type on the surface of magnetic tape coated by Co-Cr metal. 5. The magnetic field lines with 10mum intervals and the magnetic gradient were observed by the spiral type. 6. The coercive force can be measured by the c occi type for the samples acquired saturation remanent magnetization.Further investigation should be performed for the quantative analysis of bacterial migration force, interaction between the bacterium and ambient magnetic field, and Brownian motion.