Qhov tshwm sim ntau ntawm npuas maj mam nce hauv cov dej khib nyiab thiab txhaj oxygen. Qhov no oxygenation tsim ib qho chaw tsim nyog rau kev tsim cov kab mob enzymes. Cov npuas loj yog qhov ua tau zoo ntawm cov npuas diffuser system. Yav dhau los, tuab tuab npuas diffuser qhov tau siv; Nws ntseeg tias qhov loj ntawm cov npuas loj, qhov nrawm nrawm dua, thiab qhov zoo dua qhov"pumping" los yog faib cov pa oxygen.
Cov qauv tam sim no yog siv cov qhov me me, vim tias cov kev tshawb fawb tau pom tias nyob rau hauv ntau daim ntawv thov, qhov zoo ntawm cov npuas zoo, qhov ua tau zoo ntawm cov pa oxygen ntau dua. Qhov nruab nrab npuas diffuser pore loj hauv cov dej khib nyiab feem ntau yog li 0.08 ntiv tes lossis 2 hli, thiab qee zaum qhov loj siv me me li 0.04 ntiv tes lossis 0.9 hli.