Definition

Proper noun A Danish physician and bacteriologist, best known for developing the Gram stain, a fundamental laboratory technique in microbiology used to classify bacteria into two major groups (Gram-positive and Gram-negative) based on their cell wall properties.

Usage

This term is used almost exclusively to refer to the historical figure and the staining method named after him. * The Gram stain procedure was developed by Hans C. J. Gram. * In microbiology, we studied the contributions of Hans C. J. Gram.

Advanced Usage

• Eponymous Use: The surname "Gram" is used adjectivally in the terms "Gram stain," "Gram-positive," and "Gram-negative," which are far more common in modern scientific language than the full name.
  • Correct: "The bacteria were identified as Gram-positive cocci."
  • Less common: "This classification is based on the work of Hans C. J. Gram."

Variants and Related Words

• Gram stain (n.): The differential staining technique invented by Hans C. J. Gram.
• Gram-positive (adj.): Describing bacteria that retain the crystal violet stain and appear purple under the microscope.
• Gram-negative (adj.): Describing bacteria that do not retain the crystal violet stain and appear red or pink after a counterstain is applied.

Synonyms

• There are no direct synonyms for the proper name of a person. Related terms include bacteriologist and microbiologist, which describe his profession.

Related Phrases

• Gram's method: Another term for the Gram stain procedure.
• Gram staining: The act of performing the Gram stain technique.

Noun

1. Danish physician and bacteriologist who developed a method of staining bacteria to distinguish among them (1853-1938)