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Analytical Systems, Electron Microscopes & Medical Systems


Balls of Duckweed

Balls of Duckweed

© Yasushi Kuroda, Toshie Yaguchi (Hitachi Science Systems, Ltd.)
© Takahito Hashimoto (Instrument Division, Hitachi, Ltd.)
© Kazuyuki Tohji (Tohoku University)

These balls are magnetic particles of about 1 micron in diameter attached on carbon paste. These balls produce specific color by selective light reflection due to optical interference. They are called stratified particles. The picture was recorded using a 200 kV SEM. These stratified particles look like balls of duckweed growing in the bottom of a fresh water lake under the sunshine.

At 55th photo contest hosted by the Japanese Society of Electron Microscopy in 1999.


  • Specimen : Stratified particles used for toner of copy machines
  • Instrument : Ultra-thin Film Evaluation System HD-2000
  • Accelerating voltage : 200 kV

  • Specimen : Courtesy of Professor Kazuyuki Tohji (Tohoku University)
All information related to these photographers is based on the information when the photo was taken.
This work was presented at the "photo contest" hosted by the Japanese Society of Microscopy.
Reproduction or republication without permission prohibited.
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