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fluorescent microscope
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fluorescent microscope

instrument

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use in microbiology

work of Hell

  • Hell, Stefan
    In Stefan Hell

    …through a modified form of fluorescence microscopy, in which molecules that fluoresce when excited by light are attached to very small structures and the resulting emission is observed. In Hell’s technique—called stimulated emission depletion (STED) microscopy—one laser beam excites the fluorescent molecules, but another turns off the fluorescence except from…

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ultramicroscope
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ultramicroscope

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microscope
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ultramicroscope, microscope arrangement used to study colloidal-size particles that are too small to be visible in an ordinary light microscope. The particles, usually suspended in a liquid, are illuminated with a strong light beam perpendicular to the optical axis of the microscope. These particles scatter light, and their movements are seen only as flashes against a dark background; their structure is not resolved.

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