Estimation for diameter of superparamagnetic particles in Daphnia resting eggs

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概要

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• Ferromagnetic resonance (FMR) with an electron spin resonance (ESR) apparatus was investigated for superparamagnetic particles within Daphnia resting eggs. High-field (HF) resonance lines near g=2 resulted from single superparamagnetic particles, were detected from ESR spectra of Daphnia resting eggs. The size of isolated superparamagnetic particles within Daphnia resting eggs was calculated to be approximately 13 nm in diameter by analysis of the temperature dependence of the HF line width. Small-angle X-ray scattering (SAXS) analysis of Daphnia resting eggs also showed that average size of superparamagnetic particles in diameter, equivalent to magnetite, was approximately 13 nm. The combination of FMR and SAXS measurement is very effective in estimating the size of superparamagnetic particles in biological organisms, with difficulties of preparing for samples for measurement by electron microscopy. However, Chlorella, with that Daphnia were raised, did not show FMR spectra, showing no magnetic particles within Daphnia resting eggs. Therefore, it suggested that superparamagnetic particles within Daphnia resting eggs, were mineralized in Daphnia as the result of biomineralization of Fe originated from Chlorella.

著者

• Kawasaki Tamami

  Advanced Research Institute for Science and Engineering, Waseda Univ.

• Sakata Masanobu

  Department of Integrative Bioscience and Biomedical Engineering, Waseda Univ.

• Shibue Toshimichi

  Materials Characterization Central Laboratory Waseda Univ.

• Namiki Hideo

  Department Of Biology Faculty Of Education And Integrated Arts And Sciences Waseda University

• Kawasaki Tamami

  Advanced Research Institute for Science and Engineering, Waseda University

• Namiki Hideo

  Department of Biology, Waseda University

• Sakata Masanobu

  Department of Integrative Bioscience and Biomedical Engineering, Waseda University

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