Fig. 2From: Magnetic, biocompatible FeCO3 nanoparticles for T2-weighted magnetic resonance imaging of in vivo lung tumorsStructural and functional properties of FeCO3 NPs. A Magnetic hysteresis loops of FeCO3 NPs at 300Â K. B T1 and T2-weighted magnetic contrast properties of FeCO3 NPs in aqueous media. C r1 and r2 values of FeCO3 NPs with respect to the Fe ion concentration. D T2 weighted MRI phantoms of FeCO3 NPs at pH 5.5 and 7.0. E r2 relaxivity values of FeCO3 NPs at pH 5.5 and 7.0. F Hemolysis assay of FeCO3 NPs at different concentrations, H2O and 0.9% NaCl were respectively used as negative and positive controls (inset show optical images of assay aliquots). G T2-weighted MR contrast ability of lung cancer cells in vitro, pre and post-24Â h incubation of FeCO3 NPsBack to article page