What type of atmosphere is required for strict anaerobic growth?

The ideal atmosphere for strict anaerobic growth is one that completely lacks oxygen (O2). Strict anaerobes are organisms that not only fail to grow in the presence of oxygen but are often harmed or killed by it. The absence of O2 is crucial because these organisms have metabolic pathways that are incompatible with oxygen, typically relying on fermentation or anaerobic respiration for energy production.

While elevated levels of carbon dioxide (CO2) can promote the growth of some microbes, it is not a necessary factor for strict anaerobes, who primarily require the complete exclusion of oxygen to thrive. The atmosphere specifically tailored for strict anaerobes usually contains inert gases, such as nitrogen or carbon dioxide, to create an environment devoid of oxygen.

Therefore, the atmosphere required for the growth of strict anaerobes is one that completely lacks Oxygen, providing the necessary conditions for these organisms to survive and grow.