Response surface optimization of light conditions for organic matter accumulation in two different shapes of <i>Arthrospira platensis</i>.

As shown in Table 2 , the growth rate of strains 623 and 793 increased at first and then showed a decreasing trend with the increase of red-light ratio.

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The chlorophyll a content of strain 793 showed a trend of increase at first and then decrease with the increase of the proportion of blue light, but the differences were not significant at blue: red = 2: 1–8: 1, with the content of 8.39–9.13 mg/g.

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The contour map of strain 793 is oval, and the p -value = 0.0002 < 0.01, indicating that the interaction between light cycle and light intensity of strain 793 is highly significant ( Figure 2D ).

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