The diamond knife "semi": a substitute for glass or conventional diamond knives in the ultramicrotomy of thin and semi-thin sections.

The diamond knife "semi" for ultramicrotomes was originally designed by its manufacturer (DIATOME S.A.), for cutting semi-thin sections from 0.2 micron to 2.0 micron. Cutting tests of Epon-embedded material (nervous system, myelin sheat) with this knife have shown that the quality of semi-thin sections is equivalent or better than that obtained with a glass knife, and much time could be saved during the microtomy of serial sections. The quality of thin sections (0.07 micron to 0.12 micron) is excellent and comparable to that obtained with a conventional diamond knife. Furthermore, when adjacent sections are cut thin and semi-thin (for immunochemistry or high voltage microscopy), both are excellent in that they are of uniform thickness. In conclusion, this tool has advantages for both light microscopy and transmission electron microscopy.