Studies performed with cells or biological molecules studied outside their normal biological context; for example proteins are examined in solution, or cells in artificial culture medium. Colloquially called “test tube experiments”, these studies in biology and its sub-disciplines are traditionally done in test-tubes, flasks, petri dishes etc.
They now involve the full range of techniques used in molecular biology such as the so-called omics. Studies that are conducted using components of an organism that have been isolated from their usual biological surroundings permit a more detailed or more convenient analysis than can be done with whole organisms. In contrast, in vivo studies are those conducted in animals including humans, and whole plants.« Back to Dictionary Home