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Magnetotactic bacteria can be affected by Earth's magnetic field orientation. They have been observed various forms of cocci, bacilli and spirilla. These bacteria make magnetosomes affected by the magnetic field and its orientation as part of the iron is stored. In this study, the presence of magnetotactic bacteria in different parts of Iran with features freshwater pearls saline containing iron mine in Zanjan, Persian Gulf, Mighan and Qom wetlands was investigated. Sediments and water collected were put under magnetic field. Results showed that all types of isolated bacteria were, Gram-negative and shapes to bacillus, spirillum and coccus. The magnetic field in the capillary tube containing a magnetotactic bacterium that responds was observed to magnetic field. Mighan and Qom wetlands and Zanjan's iron mine samples have more cases of magnetotactic bacteria,were studied in particular. Transmission electron microscopy images of iron nanoparticles were visible within it. Results molecular analysis, sequencing and BLAST in NCBI website showed in sample Znjan's iron mine there is Magnetospirillum magnetotacticum strain. Higher concentrations indicate of iron nanoparticles in the sample compared to the Mighan wetland with iron mine, that the abundance of iron ions alone did not increase the level of magnetic nanoparticles of Fe by bacteria.

Keywords: Magnetospirillum magnetotacticum, magnetotactic bacteria, Magnetospirillum magnetotacticum, nanoparticles, transmission electron microscopy (TEM), magnetosome

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