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Weak magnetic fields affect a multitude of biological processes including cell metabolism and are hypothesized to be a result of magnetic field-sensitive spin-selective radical-pair reactions. To provide much needed visualization of this process, we demonstrate the use of a custom-built multimodal nonlinear optical imaging system capable of measuring the redox state of cells through multi-photon-excited autofluorescence and autofluorescence lifetime of metabolic cofactors. We demonstrate a custom multi-axis Helmholtz coil system to apply time-varying magnetic fields across the sample during imaging. This imaging platform allows for characterization and optimization of the effects of magnetic fields on live cells and tissues.
Tan et al. (Wed,) studied this question.