#oxygen deficit

• Anaerobic — Said of organisms (bacteria, fungi) that can live, develop, or carry out their structural vital processes in the absence of free molecular oxygen; it also describes biochemical processes (fermentation, cellular respiration) taking place without the participation of oxygen. In sports physiology, it qualifies intense, short-duration physical efforts where energy is produced by breaking down carbohydrates without additional oxygen supply.
• Anaerobiotic — Pertaining to anaerobiosis or occurring under conditions completely devoid of oxygen; referring to anoxic metabolisms, organisms, or living environments. In a structural biochemical sense, it qualifies organic substance degradation reactions where the final electron acceptor is not molecular oxygen, but another chemical compound (such as nitrate or sulfate).
• Anaerobiosis — Life or mode of existence of certain organisms (bacteria, yeasts) in environments completely devoid of free molecular oxygen; the totality of structural metabolic and biochemical processes through which cells secure their required energy in the absence of oxygen, relying on fermentation or anaerobic respiration. This ecological and physiological phenomenon is crucial in extreme ecosystems, the food fermentation industry, and wastewater treatment plants.