 | Nanotech 2009 Vol. 1
Nanotechnology 2009: Fabrication, Particles, Characterization, MEMS, Electronics and Photonics
Chapter 4: Nanoscale Characterization |
Characterization of Intracellular Biogenic Crystals Synthesized by Freshwater Magnetotactic Bacteria (MTBs) | |
| Authors: | V. Morillo, M. Márquez, A. Morales |
| Affilation: | Universidad Nacional de Colombia Sede Medellín, CO |
| Pages: | 409 - 413 |
| Keywords: | magnetotactic bacteria, biogenic magnetite, magnetosome, single domain |
| Abstract: | Intracellular biogenic crystals synthesized by freshwater magnetotactic bacteria (MTBs) from Colombia were characterized. MTBs were separated from water/sediment samples using a magnetic field of 6 Gauss. Bacteria were observed by transmission electronic microscopy (TEM). Bacterial concentrated were analyzed with X-ray microdiffraction, Fourier Transform Infrared spectroscopy (FTIR) and magnetic measurements. Magnetosomes were measured and analyzed with EDX/TEM (Energy dispersive X-ray spectroscopy/Transmision Electron Microscopy). Results showed magnetite crystals with cuboctaedral, hexagonal prismatic morphology and bullet morphology; most of crystals were classificated in the single domain magnetic state, with an average length < 100 nm. Samples with MTBs were saturated in a field near to 100 mT, showing ferrimagnetic minerals. This Results open path to others studies with MTBs in Colombia, allowing to find applications of magnetic biominerals in nanotechnology and biomedicine. |
| ISBN: | 978-1-4398-1782-7 |
| Pages: | 702 |
| Hardcopy: | $179.95 |
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