Nanotech 2009 Vol. 1
Nanotech 2009 Vol. 1
Nanotechnology 2009: Fabrication, Particles, Characterization, MEMS, Electronics and Photonics

Nanoscale Characterization Chapter 4

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, Colombia

Pages: 409 - 413

Keywords: magnetotactic bacteria, biogenic magnetite, magnetosome, single domain

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