Ultrasonics signals at frequencies and are measured in two organelles of a single vegetal cell in vitro with a picosecond ultrasonic technique. Using standard values for cell optical index, ultrasound velocities of and are measured from several signals recorded in the vacuole and in the nucleus of a single Allium cepa cell, respectively. A lateral and depth resolution is attained.
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The value of the optical index of the different organelles of a living cell is still an open question and it is out the objective of this letter. Several papers have shown that the optical index of the cytoplasm and the nucleus are very similar and both are close to 1.4. See for instance,
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