Definition

1. Adjective:
   • (In microbiology) Completely free from other living organisms: Used specifically to describe a culture of microorganisms that contains only a single, intended species, with no contaminants.
   • (In biology) Raised under sterile, germ-free conditions: Used to describe laboratory animals that have been delivered by cesarean section and reared in a completely sterile, isolated environment to ensure they have no associated microbiota.

Usage Examples

• Adjective (Microbiology context):

  • The researcher maintained an axenic culture of the bacteria for the purity of the experiment.
  • Achieving an axenic algal culture is challenging but essential for certain physiological studies.

• Adjective (Experimental biology context):

  • The mice used in the study were axenic, allowing scientists to study the effects of specific introduced bacteria.
  • Rearing axenic animals requires specialized isolator technology.

Advanced Usage

• "Axenic cultivation": The process of growing a single species in isolation from all others.

  • Axenic cultivation is a fundamental technique in microbiology.

• "Axenic state": The condition of being free from foreign organisms.

  • The larvae were kept in an axenic state until the introduction of the test microbe.

Variants and Related Words

• Aseptic (adj): Free from pathogenic microorganisms. (Note: "Aseptic" often refers to techniques to prevent infection, while "axenic" describes a state of biological purity.)
• Gnotobiotic (adj): Referring to organisms or conditions where all present microorganisms are known. (An axenic organism is a type of gnotobiotic organism.)
• Germfree (adj): Synonym for "axenic," especially in the context of animals.

Synonyms

• Germfree
• Sterile (in a biological, contaminant-free sense)
• Pure culture (as a noun phrase for the microbiology context)

Notes on Meaning

• This is a highly specialized scientific term. Its first meaning is most common in microbiology labs, and its second meaning is standard in immunology, gastroenterology, and experimental animal science.
• It is distinct from general terms like "clean" or "pure." "Axenic" has a precise technical definition requiring the complete absence of all other living organisms.

Adjective

1. (used of cultures of microorganisms) completely free from other organisms
   • an axenic culture
2. (of experimental animals) raised under sterile conditions
   • axenic conditions
   • germfree animals