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- W2143854036 abstract "We grew Thalassiosira weissflogii to steady state over a range of Fe-limiting conditions with nitrate or ammonium as the N source. Nitrate-dependent cells had faster Fe-uptake rates, contained significantly higher intracellular Fe quotas, and grew faster than cells cultivated with NH4+ when Fe was most limiting. Under these conditions, carbon (C) : chlorophyll a ratios and the minimum fluorescence yield per chlorophyll a increased, but N source had no effect on either parameter. The ratio of variable to maximum fluorescence (Fv Fm−1) declined little with Fe limitation m even when T. weissflogii was grown at 25% of its maximum rate (µmax). C:N ratios were higher in nitrate than in ammonium-grown cells and were constant at all Fe levels. Protein was independent of Fe and N, and amino acids were lowest in cells using NO3−. The P content of T. weissflogii (mol P L−1 cell volume) increased by 1.5 times as Fe became most limiting to growth, causing N: P and C: P ratios to decline significantly. The elemental stoichiometry for Fe-limited new production of T. weissflogii (0.25µmax) was thus 70C : 10N : 5.9Si : 1P : 0.00074Fe (by mols) compared with 97C : 14N : 4.7Si : 1P : 0.029Fe for nutrient-replete conditions. Uptake rate ratios of NO3− : PO43− showed the same dependence on Fe as the cellular N: P quotas, decreasing as [Fe] decreased. Iron limitation influenced the elemental composition of this marine diatom and will alter the assimilation ratios of C, N, and P in the high nitrate, low chlorophyll regions of the sea." @default.
- W2143854036 created "2016-06-24" @default.
- W2143854036 creator A5025171905 @default.
- W2143854036 date "2005-07-01" @default.
- W2143854036 modified "2023-09-30" @default.
- W2143854036 title "The elemental stoichiometry and composition of an iron-limited diatom" @default.
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- W2143854036 doi "https://doi.org/10.4319/lo.2005.50.4.1159" @default.
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