Question

The temperature of incubator is usually kept at :

• A. $$48^\circ\text{C}$$
• B. $$37^\circ\text{C}$$
• C. $$24^\circ\text{C}$$
• D. $$19^\circ\text{C}$$

Answer 1

Answer:

$$37^\circ\text{C}$$

Incubator Temperature Standards

• Standard Setting: In most microbiological and clinical laboratory applications, incubators are typically maintained at 37°C (98.6°F).
• Rationale: This specific temperature mimics the human body's core temperature, making it optimal for the growth of mesophilic bacteria, which are the most common pathogens affecting humans.
• Clinical Significance: Most clinical cultures, such as those used for E. coli, Staphylococcus aureus, and other human pathogens, require this constant temperature to achieve logarithmic growth phases.
• Variable Requirements: While 37°C is the standard, laboratory protocols may vary depending on the organism:
  
  • Fungal Cultures: Often incubated at lower temperatures, typically 25°C to 30°C.
  • Thermophiles: Certain specialized organisms require significantly higher temperatures, often ranging from 50°C to 70°C.
  • Psychrophiles: Grow optimally at cold temperatures, often below 20°C.
• Instrument Monitoring: Modern CO2 incubators, used for mammalian cell culture, also maintain a precise 37°C environment alongside controlled levels of 5% CO2 to maintain pH stability in media through the bicarbonate buffering system.