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2642632259
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note
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After deposition on the TEM grids, the bacterial cells were dried in air and were kept in a grid box in air before and between TEM studies. We used a JEOL 2000FX TEM operated at a 200-kV accelerating voltage and equipped with a double-tilt (±30°, ±45°) goniometer stage. TEM images were used to observe particle morphologies and structural defects. Compositions were determined by energy-dispersive x-ray spectrometry with an attached ultrathin-window KEVEX detector. Experimental k-factors for thin-film analysis were determined for Fe and Cu using pyrite and Cu sulfide standards. The structures of Fe sulfides were identified using single-crystal SAED by tilting the crystals into zone-axis orientations.
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9
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2642696301
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note
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There is uncertainty in the measured d spacings as a result of structural disorder in almost every part of this crystal.
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14
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2642591490
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note
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110 spacings of mackinawite are 2.7 and 2.6 Å, respectively; the observed reflections have d values closer to cubic FeS than to mackinawite.
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17
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2642602595
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note
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In the case of these small crystals embedded in bacterial cells, the analytical error is estimated to be about 0.1 formula unit Fe.
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18
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2642684035
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One month after sample collection, these crystals were still mackinawite or cubic FeS; they also contained a few atomic percent Cu, just like the disordered mackinawite-greigite magnetosomes. The cell was collected from Salt Pond, MA.
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20
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2642633287
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note
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We thank J. B. Murowchick, H. Hartman, and I. Dódony for helpful discussions, B. Howes and D. R. Schlezinger for help with sample collection, and W. H. Fowle for suggestions in the manipulation of magnetotactic microorganisms. Supported by grants from NSF and NASA. Electron microscopy was performed at the Center for High-Resolution Electron Microscopy at Arizona State University.
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