Definition

1. Adverb:

   • In the living organism: Refers to processes, experiments, or studies conducted within a whole, living organism, such as an animal, plant, or human.

2. Adjective:

   • Within a living organism: Describes techniques, methods, or observations that take place inside a living body.

Usage Examples

• Adverb:

  • The drug's effectiveness was tested in vivo before clinical trials.
  • These metabolic processes can only be fully understood when studied in vivo.

• Adjective:

  • In vivo imaging allows doctors to see real-time biological activity.
  • The research team developed a new in vivo gene therapy technique.

Advanced Usage

• Scientific Contrast: Often contrasted with "in vitro" (which means "in glass," referring to studies in controlled laboratory environments outside a living organism). The phrase "from in vitro to in vivo" describes translating laboratory findings to living systems.
  • The compound showed promise in vitro, but its in vivo effects were different.

Variants and Related Words

• Ex vivo: Refers to experimentation on tissues from an organism, maintained outside the body in an artificial environment.
• In silico: Refers to experimentation conducted via computer simulation.

Synonyms

• Within the organism
• In the living body

Related Phrases

• In vivo model: A living organism used to study biological processes or test treatments.
  • Mice are common in vivo models for human disease research.
• In vivo efficacy: The effectiveness of a treatment as measured in a living organism.

Adjective

1. within a living organism
   • in vivo techniques

Adverb

1. in the living organism
   • studies conducted in vivo