Figure 2.

The photograph of Sphingomonas sp. XLDN2-5. A is the SEM image of Sphingomonas sp. XLDN2-5 (magnification × 15,000). B is the TEM image of microbial cell/Fe3O4 biocomposite (magnification × 36,000).

Li et al. Nanoscale Research Letters 2013 8:522   doi:10.1186/1556-276X-8-522
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