Magnetic Bacteria as a Tool for Bioremediation of Heavy Metal Ion

Yi Ri Le Tu; Shingo Watanabe; Tatsuo Iwasa

doi:10.4028/www.scientific.net/AMR.955-959.589

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 955-959Magnetic Bacteria as a Tool for Bioremediation of...

Magnetic Bacteria as a Tool for Bioremediation of Heavy Metal Ion

Abstract:

Magnetotactic bacteria (MTB) are microorganism found in lake sediments and have a chain like organelle called magnetosome which is composed of highly pure crystal of magnetite (Fe₃O₄). We cultured Magnetospirillum magnetotacticum (MS-1) with culture media containing heavy metal ions such as Fe (standard media), Fe/Zn or Fe/Co and study on a possibility of MTB as a tool for bioremediation. In culture media containing Fe, Fe/Zn or Fe/Co, the growth rate of the bacteria was almost same. We measured the magnetic properties of the dried cells. The saturation magnetization (M_s) and the saturation remanence (M_r) of MS-1 cultured in Fe/Zn or Fe/Co media were decreased, but the coercivity (H_c) and the coercivity remanence (H_r) were increased from those of MS-1 cultured in the Fe media. The value of M_r/M_s and H_r/H_c were ca. 0.5 and ca. 1.0, respectively. The changes in the magnetic properties of MS-1 cultured in Fe/Zn or Fe/Co media represent that MS-1 would take not only Fe, but also Zn or Co element in their environment. We discuss about a possible usage and advantages of MTB as a tool for bioremediation.

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Advanced Materials Research (Volumes 955-959)

Pages:

589-592

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.955-959.589

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Online since:

June 2014

Authors:

Yi Ri Le Tu, Shingo Watanabe, Tatsuo Iwasa*

Keywords:

Bacterial Growth, Bioremediation, Heavy Metal, Magnetic Property, Magnetospirillum magnetotacticum MS-1

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