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- W1970316456 abstract "Isolated rat adrenal chromaffin cells were studied with laser light scattering and Nomarski differential interference contrast microscopy. Evidence of organelle movement and of the fusion of secretory granules with the plasma membrane was obtained. A specially modified microscope was used to collect, coherently, laser light scattered from groups of 1–3 cells. Autocorrelation analysis of intensity fluctuations of the scattered light indicated that relative movements of cytoplasmic particles of about 0.1 μm or larger took seconds or longer, compared with the millisecond time periods that would be expected for free diffusion of the cytoplasmic organelles of the cells in a medium with a viscosity equal to that of water. Cytochalasin B (CB) and reduced temperature were found to reduce the relatively fast component of the decay of the autocorrelation, indicating decreased motion in the cells. Fixation with formaldehyde reduced the autocorrelation amplitude to zero, indicating the absence of motion. It is suggested that the intensity fluctuations were a consequence of organelle motility within the cells. Time-lapse photomicrography with Nomarski differential interference contrast optics indicated that the movements of the cytoplasmic particles which could be distinguished were highly restricted, except for occasional observations of distinct particle saltations at about 0.2 μm/sec. No change was observed in particle motion during stimulation with secretagogues, but microspikes formed on the cell surfaces, presumably due to the addition of secretory granule membranes to the plasma membrane as a consequence of exocytosis." @default.
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- W1970316456 date "1980-02-01" @default.
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- W1970316456 title "An optical study of isolated rat adrenal chromaffin cells" @default.
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- W1970316456 doi "https://doi.org/10.1016/0014-4827(80)90131-7" @default.
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