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Table 1 Cellular characteristics of N. oceanica and Phaeodactylum tricornutum

From: Effect of ammonium and high light intensity on the accumulation of lipids in Nannochloropsis oceanica (CCAP 849/10) and Phaeodactylum tricornutum (CCAP 1055/1)

Species

P. tricornutum

N. oceanica

Treatment

N+

N−

A

A+W

N+

N−

A

A+W

Cell abundance (×106 cells mL−1)

20.4

6.25

11

10

48.1

24.5

5.64

36.1

µmax (day−1)

0.35 (± 0.02)

0.21(a) (± 0.02)

0.29 (± 0.03)

0.29 (± 0.02)

0.42 (± 0.01)

0.29(a) (± 0.03)

0.38(b) (± 0.03)

0.36(b) (± 0.02)

POC (µg mg−1)

328.4 (± 21.7)

310.6 (± 24.2)

345.5 (± 32.1)

288.9 (± 7.9)

503.2 (± 7.9)

590.1(a) (± 8.8)

576.2(a) (± 1.0)

534.8 (± 18.6)

PON (µg mg−1)

32.8 (± 1.6)

20.3(a) (± 0.9)

28.5(b) (± 1.0)

26.5(a, b) (± 1.0)

48.4 (± 0.6)

23.0(a) (± 1.0)

43.1(b) (± 0.6)

45.2(b) (± 2.2)

  1. Maximum growth rate (µmax), cell abundance, particulate organic carbon (POC) and particulate organic nitrogen (PON) are compared for the two species in the four conditions tested [nitrate (N+), nitrogen free (N−), ammonium (A) and ammonium with tungstate (A+W) conditions]. Mean (± standard error) values are given. Analysis of the variance followed by Bonferroni post hoc test (p value < 0.05) was carried out to estimate the significance of the differences between treatments, being (a) significant difference when comparing to the N+ treatment, (b) significant difference when comparing to the N− treatment