The seed of S. cerevisiae was inoculated into YPD medium at a ratio of 1:100 in the culture flask and continuously filled with high purity nitrogen gas to sustain hypoxic circumstance in cell culture incubator. The oxygen concentrations of normoxic group and hypoxic groups were 21% (Con21), 10% (Hpx10), 5% (Hpx5), and 1% (Hpx1), respectively. The absorbance values were determined at 600 nm at the intervals of 2 h by spectrophotometry (Spectramax M2, United States) from three replicated cultures. The corresponding growth curve of S. cerevisiae was also plotted. Pelleted cells from the triplicate cultures were frozen in liquid nitrogen and stored at −80°C before use.
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