Pulsed-field-remanence measurements on individual magnetotactic bacteria

被引:91
作者
Hanzlik, M [1 ]
Winklhofer, M [1 ]
Petersen, N [1 ]
机构
[1] Univ Munich, Inst Geophys, D-80333 Munich, Germany
关键词
bacteriodrome; wild-type magnetic vibrio; Magnetobacterium bavaricum; biogenic magnetite; template-based crystal growth;
D O I
10.1016/S0304-8853(02)00353-0
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We measured pulsed-magnetic-field remanences of individual cells of two types of magnetotactic bacteria. Wild-type magnetic vibrios displayed square remanence curves with the reversal field, H-rev reaching values up to 825 Oe (65.7 kA/m). We attribute the generally high values of H-rev to the elongated shape of the magnetosomes (length-to-width ratio, e approximate to 1.2) and to the comparatively short distances between the magnetosomes (8 nm). Cells of the rod-shaped Magnetobacterium bavaricum, on the other hand, which frequently contain more than 600 magnetosomes per cell, could gradually be demagnetised; the coercivity of remanence, H-cr of individual cells always ranged between 600 and 700 Oe (47.7-55.7 kA/m). The non-square remanence curves of M. bavaricum reflect a distribution of elongations and interactions between adjacent strands of magnetosomes within the braid-like chains. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:258 / 267
页数:10
相关论文
共 22 条
[21]   A MECHANISM OF MAGNETIC HYSTERESIS IN HETEROGENEOUS ALLOYS [J].
STONER, EC ;
WOHLFARTH, EP .
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1948, 240 (826) :599-642
[22]   THE EFFECT OF PARTICLE INTERACTION ON THE COERCIVE FORCE OF FERROMAGNETIC MICROPOWDERS [J].
WOHLFARTH, EP .
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1955, 232 (1189) :208-227