Figure 4From: Free radical scavenging and formation by multi-walled carbon nanotubes in cell free conditions and in human bronchial epithelial cellsElectron spin resonance (ESR) spectra of 1 mg/mL MWCNT SP in buffer (showing the induction of O 2  · -), buffer with BSA, medium and medium with BSA, and the control (buffer) in cell free settings. Spectra are shown at identical intensity scale.Back to article page