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2014 | 126 | 1 | 198-199
Article title

Characterization of Magnetosomes After Exposure to the Effect of the Sonication and Ultracentrifugation

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EN
Abstracts
EN
Magnetosomes are intracellular organelles of widespread aquatic microorganisms called Magnetotactic bacteria. At present they are under investigation especially in biomedical applications. This ability depends on the presence of intracellular magnetosomes which are composed of two parts: first, nanometer-sized magnetite (Fe_{3}O_{4}) or greigite (Fe_{3}S_{4}) crystals (magnetosome crystal), depending on the bacterial species; and second, the bilayer membrane surrounding the crystal (magnetosome membrane). The magnetosomes were prepared by biomineralization process of magnetotactic bacteria Magnetospirillum Magnetotacticum sp. AMB-1. The isolated magnetosome chains (sample M) were centrifugated at speed of 100000 rpm for 4 hours (sample UM) and sonicated at power of 120 W for 3 hours (sample SM), respectively. The prepared suspensions were investigated with respect to morphological, structural and magnetic properties. The results from scanning electron microscopy showed that isolated chains of magnetosomes were partially broken to smaller ones after ultracentrifugation. On the other hand the application of the sonication process caused the formation of individual magnetosomes (unordered in chain). These results were confirmed by coercivity and magnetization saturation measurements.
Keywords
Contributors
author
  • Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Kosice, Slovakia
author
  • Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Kosice, Slovakia
author
  • Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Kosice, Slovakia
author
  • Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Kosice, Slovakia
  • Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Kosice, Slovakia
author
  • Institute of Physics, Poznan University of Technology, Nieszawska 13A, 60-965 Poznań, Poland
  • Max Planck Institute for Polymer Research, Ackermannweg 10, 55-128 Mainz, Germany
author
  • Institute of Physics, Poznan University of Technology, Nieszawska 13A, 60-965 Poznań, Poland
  • Max Planck Institute of Colloids and Interfaces, Department of Interfaces, Wissenschaftspark Potsdam-Golm, Am Mühlenberg 1 OT Golm, 14476 Potsdam, Germany
author
  • Institute of Geotourism, Technical University of Košice, Letná 9, 042 00 Košice, Slovakia
author
  • Institute of Geotourism, Technical University of Košice, Letná 9, 042 00 Košice, Slovakia
author
  • Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Kosice, Slovakia
References
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv126n1094kz
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