Magnetic characterization of Daphnia resting eggs
| Autor: | Toshimichi Shibue, Atsushi Takada, Hideyuki Yoshimura, Hideo Namiki, Tamami Kawasaki, Masanobu Sakata |
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| Rok vydání: | 2006 |
| Předmět: |
Magnetic moment
Chemistry Magnetometer Physics::Medical Physics Temperature Biophysics Analytical chemistry Cell Biology Biochemistry law.invention Magnetic field SQUID Magnetics Magnetization Paramagnetism Daphnia law Transmission electron microscopy Animals Female Molecular Biology Ovum Superparamagnetism |
| Zdroj: | Biochemical and Biophysical Research Communications. 351:566-570 |
| ISSN: | 0006-291X |
| Popis: | This study characterized the magnetic materials found within Daphnia resting eggs by measuring static magnetization with a superconducting quantum interference device (SQUID) magnetometer, after forming two types of conditions, each of which consists of zero-field cooling (ZFC) and field cooling (FC). Magnetic ions, such as Fe 3+ , contained in Daphnia resting eggs existed as (1) paramagnetic and superparamagnetic particles, demonstrated by a magnetization and temperature dependence of the magnetic moments under an applied magnetic field after ZFC and FC, and (2) ferromagnetic particles with definite magnetic moments, the content of which was estimated to be very low, demonstrated by the Moskowitz test. Conventionally, biomagnets have been directly detected by transmission electron microscopes (TEM). As demonstrated in this study, it is possible to nondestructively detect small biomagnets by magnetization measurement, especially after two types of ZFC and FC. This nondestructive method can be applied in detecting biomagnets in complex biological organisms. |
| Databáze: | OpenAIRE |
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