2D light scattering patterns of mitochondria in single cells.

The ability to characterize the mitochondria in single living cells may provide a powerful tool in clinical applications. We have recently developed a 2D (both polar angle and azimuth angle dependences) light scattering cytometric technique which we apply here to assess experimental 2D light scattering patterns from single biological cells (yeast and human). We compare these patterns to those obtained from simulations using a 3D Finite-Difference Time-Domain (FDTD) method and demonstrate that microstructure (e.g., the cytoplasm and/or nucleus) of cells generates fringes of scattered light, while in the larger human cells the light scattered by the mitochondria dominates the scatter pattern, forming compact regions of high intensity that we term 'blobs'. These blobs provide information on the mitochondria within the cell and their analysis may ultimately be useful as a diagnostic technique.