An incubator is a device or enclosed environment that maintains stable conditions of temperature, humidity, gas composition and sometimes agitation to support the growth and development of organisms or cells.
Explanation
Laboratory incubators are essential equipment in microbiology, cell biology and developmental biology. Their primary purpose is to create an environment that mimics the natural conditions experienced by the organisms under study. Temperature is controlled with heating elements and feedback sensors; many incubators hold bacterial cultures at 35–37 °C to approximate human body temperature. Humidity and carbon dioxide levels can be adjusted, particularly in CO2 incubators used for mammalian cell culture, where 5 % CO2 helps maintain pH balance in bicarbonate‑buffered media. Some incubators are equipped with orbital shakers to aerate cultures or promote even growth, while anaerobic incubators or jars use gas mixtures to exclude oxygen for obligate anaerobes. Regular cleaning and use of sterile water reservoirs help prevent contamination and maintain a stable environment.
Applications
Microbiology laboratories use incubators to cultivate bacterial and fungal cultures on agar plates or in broth at temperatures suited to each species. Tissue culture facilities rely on CO2 incubators to grow human or animal cell lines for research, vaccine production and drug testing. Embryologists incubate fertilised eggs in devices that control heat and humidity to support embryonic development and hatching in poultry or model organisms. In clinical settings, neonatal incubators provide controlled warmth, humidity and oxygen for premature or ill infants who cannot yet regulate their body temperature. Specialty incubators with controlled oxygen or agitation are used in anaerobic culture, fermentation processes and enzyme assays.
By providing consistent environmental conditions, incubators enable reproducible biological experiments and support the survival and growth of sensitive organisms or cells.
Related Terms: Incubation, Incubation Period, Cell culture, Culture, Microbiology