NDLI: Magnetic properties of Acidithiobacillus ferrooxidans.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Yan, Lei Zhang, Shuang Chen, Peng Wang, Weidong Wang, Yanjie Li, Hongyu
Description	Author Affiliation: Yan L ( College of Life Science and Technology, Heilongjiang Bayi Agricultural University, Daqing, 163319, PR China.)
Abstract	Understanding the magnetic properties of magnetotactic bacteria (MTBs) is of great interest in fields of life sciences, geosciences, biomineralization, biomagnetism, and planetary sciences. Acidithiobacillus ferrooxidans (At. ferrooxidans), obtaining energy through the oxidation of ferrous iron and various reduced inorganic sulfur compounds, can synthesize intracellular magnetite magnetosomes. However, the magnetic properties of such microorganism remain unknown. Here we used transmission electronmicroscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD) assay, vibrating sample magnetometer (VSM), magneto-thermogravimetric analysis (MTGA), and low temperature magnetometry to comprehensively investigate the magnetic characteristics of At. ferrooxidans. Results revealed that each cell contained only 1 to 3 magnetite magnetosomes, which were arranged irregularly. The magnetosomes were generally in a stable single-domain (SD) state, but superparamagnetic (SP) magnetite particles were also found. The calcined bacteria exhibited a ferromagnetic behavior with a Curie Temperature of 454 °C and a coercivity of 16.36 mT. Additionally, the low delta ratio (Î´FC/Î´ZFC=1.27) indicated that there were no intact magnetosome chains in At. ferrooxidans. Our results provided the new insights on the biomineralization of bacterial magnetosomes and magnetic properties of At. ferrooxidans.
File Format	HTM / HTML
ISSN	09284931
Issue Number	7
Volume Number	33
e-ISSN	18730191
Journal	Materials Science and Engineering: C
Language	English
Publisher	Elsevier
Publisher Date	2013-10-01
Publisher Place	Netherlands
Access Restriction	Subscribed
Subject Keyword	Discipline Materials Science Acidithiobacillus Chemistry Magnetic Phenomena Cytology Ultrastructure Magnetosomes Spectrometry, X-ray Emission Temperature Thermogravimetry X-ray Diffraction Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Biomaterials Condensed Matter Physics Bioengineering Mechanical Engineering

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