Definition

1. Noun:
   • A microscopy technique using scattered light: "Dark field illumination" is a method for examining transparent or unstained specimens, especially living material, where light is directed at an angle so that only light scattered by the specimen enters the objective lens.
   • Creates a bright specimen on a dark background: This technique causes the specimen to appear brightly luminous or illuminated against a dark, often black, background, enhancing contrast and visibility of details.

Usage Examples

• Noun:
  • Dark field illumination is particularly useful for observing bacteria like spirochetes.
  • The researcher switched to dark field illumination to view the live, unstained protozoa.
  • Using dark field illumination, the flagella of the microorganism became clearly visible.

Advanced Usage

• "Employ dark field illumination": to use this specific microscopy technique.
  • To see the internal structures without staining, we must employ dark field illumination.
• "Image obtained via dark field illumination": describes a picture or view created using this method.
  • The image obtained via dark field illumination revealed details invisible under standard bright field microscopy.

Variants and Related Words

• Dark field microscopy (n): The broader field or practice of using dark field illumination.
  • Dark field microscopy is a standard technique in microbiology labs.
• Dark ground illumination (n): A synonymous term for dark field illumination.
  • The manual referred to the technique as dark ground illumination.

Synonyms

• Dark ground illumination: An alternative name for the same technique.
• Scattering microscopy: A descriptive term highlighting the principle of light scattering.

Related Phrases

• Dark field condenser (n): The specialized microscope component necessary to create the angled illumination for this technique.
  • The microscope must be equipped with a dark field condenser for this application.

Noun

1. a form of microscopic examination of living material by scattered light; specimens appear luminous against a dark background