Mitochondrial fluorescence patterns in rhodamine 6G-stained myocardial cells in vitro. Analysis by real-time computer video microscopy and laser microspot excitation.

Cellular fluorescence in vitro has been studied employing a low light-level video system interfaced with a real-time image array-processing computer system. Changes in cytoplasmic (mitochondrial) fluorescence in myocytes employing the probe rhodamine 6G have been studied over real time with the aid of several computer-based programs. An oscillating pattern of fluorescence is observed that appears to reflect localized variations in mitochondrial activity. The low light level video computer system used in this study compares favorably with laser-stimulated microspot fluorescence photon-counting techniques for the detection of subcellular fluorescence.