Definition

1. Noun:
   • A scientific instrument: An ultramicroscope is a specialized light microscope. It does not illuminate the sample directly. Instead, it uses a strong beam of light directed from the side (dark-field illumination). This causes tiny particles to scatter the light, making them appear as bright points against a dark background. This technique allows for the detection of particles that are too small to be resolved as distinct shapes by a standard light microscope.

Usage Examples

• Noun:
  • The researcher used an ultramicroscope to observe the colloidal suspension.
  • With an ultramicroscope, scientists can detect the presence of nanoparticles.

Advanced Usage

• "Dark-field microscopy": This is the technical principle behind the ultramicroscope. It refers to the illumination method where only light scattered by the specimen enters the objective lens.
  • Dark-field microscopy, as employed in an ultramicroscope, is essential for visualizing unstained live bacteria.

Variants and Related Words

• Ultramicroscopic (adj): Pertaining to an ultramicroscope or to objects visible only with one.

  • The team made an ultramicroscopic examination of the sample.

• Ultramicroscopy (n): The use or technique of using an ultramicroscope.

  • Ultramicroscopy revealed details not seen with conventional methods.

Synonyms

• Dark-field microscope: A more general term for a microscope using the same illumination principle as an ultramicroscope.

Notes on Meaning

• The ultramicroscope is distinct from electron microscopes, which use beams of electrons instead of light to achieve much higher magnification and resolution. The ultramicroscope is a type of microscope designed for a specific detection purpose, not for achieving extreme magnification of a specimen's structure.

Noun

1. light microscope that uses scattered light to show particles too small to see with ordinary microscopes