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Table 1 Growth measurements and lipid productivity of Nannochloropsis salina operated at different nitrogen concentrations and temperatures

From: Lipid accumulation in response to nitrogen limitation and variation of temperature in Nannochloropsis salina

  Cell count Optical density Dry weight of cells Lipid productivity
  (×106/ml) (OD680) (g L−1) (g L−1 day−1)
Control 9.93 ± 0.25 0.77 ± 0.04 0.61 ± 0.03 0.23 ± 0.0
75 9.07 ± 0.45a* 0.71 ± 0.03a* 0.57 ± 0.06 0.24 ± 0.0a*
50 8.23 ± 0.45a*b* 0.65 ± 0.02a*b* 0.53 ± 0.05a* 0.30 ± 0.0a*b*
25 7.86 ± 0.45a*b* 0.63 ± 0.02a*b* 0.48 ± 0.02a*b* 0.37 ± 0.0a*b*c*
Temperature°C     
15 6.87 ± 0.55 0.53 ± 0.03 0.42 ± 0.05 0.31 ± 0.0
20 7.57 ± 0.35a 0.59 ± 0.02a 0.45 ± 0.04 0.35 ± 0.01a
25 8.23 ± 0.25ab 0.66 ± 0.01ab 0.50 ± 0.04a 0.37 ± 0.01ab
30 8.67 ± 0.06ab 0.71 ± 0.03abc 0.53 ± 0.02ab 0.43 ± 0.0abc
35 8.57 ± 0.25ab 0.72 ± 0.02abc 0.51 ± 0.02a 0.41 ± 0.01abcd
  1. Mean ± SE (n = 3) followed by different letters indicate significant difference at P ≤ 0.05, according to one-way analysis of variance (ANOVA) and the LSD (least significant difference) test (a*: significant with control at ≤0.05, b*: significant with 75% N at ≤0.05, c*: significant with 50% N at ≤0.05, a: significant with 15°C at ≤0.05, b: significant with 20°C at ≤0.05, c: significant with 25°C at ≤0.05, d: significant with 30°C at ≤0.05).