Fig. 5From: pH-responsive theranostic nanocomposites as synergistically enhancing positive and negative magnetic resonance imaging contrast agentsBiotoxicity of nanoparticles: a cell viability assays of A549 cells treated with different samples, *for samples calculated by DOX content with the upper abscissa, b H&E staining images of histological sections with major organs after 48 h injection of 200 μL Mn-IOSP NCs (experimental group) or 200 μL PBS (control group)Back to article page