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4 results for “elemental stoichiometry”
Data from: Biological stoichiometry of oleaginous microalgal lipid synthesis: The role of N:P supply ratios and growth rate on microalgal elemental and biochemical composition
<p>Biological Stoichiometry is an ecological framework connecting the balance of elements to the functioning of organisms. Here, we applied this framework to study the relationships between carbon:nitrogen:phosphorus (C:N:P) ratios and synthesis of industrial high value biochemicals in the highly oleaginous alga <em>Tetradesmus bernardii.</em> We expected an increase in protein content with increasing cellular N content and decreasing C:N stoichiometry, and an increase in lipid content with increasing C:N and C:P stoichiometry. We tested these hypotheses by exposing <em>T. bernardii</em> to N and P limitation at a range of N:P supply ratios in chemostats set at low and high dilution rates. Following expectations, the cellular protein content increased with the N content, and decreased with cellular C:N ratios across all treatments. Carbohydrates and lipids largely followed the relative availability of C and increased under both N and P limitation, with higher C:N and C:P ratios. Specifically, lipid content increased by 100–125% upon N and P limitation, with a shift towards more neutral lipids at the cost of glycolipids and phospholipids. Generally, we observed a re-allocation of cellular C from protein to carbohydrates upon modest N limitation, and towards lipids under P and severe N limitation. Our results demonstrate stoichiometrically predictable patterns of industrially valuable compounds in an oleaginous microalga.</p>
Data from: Elemental content and stoichiometry of SAR11 chemoheterotrophic marine bacteria
We measured the carbon, nitrogen, and phosphorus content and production of cultured SAR11 cells in the genus Pelagibacter, from members of the 1a.1 and 1a.3 lineages, which are adapted to productive coastal waters and oligotrophic tropical/subtropical environments, respectively. The average growing SAR11 cell contained ~6.5 fg C, from which we calculated a global standing stock of 1.4 1013 g C. Calculations that consider uncertainties in cell turnover rates and growth efficiencies indicate this stock could oxidize 6 to 37% of gross ocean primary production. We also found that SAR11 do not incorporate 3H-thymidine, but do incorporate 3H-leucine. We estimate conversion factors of 0.74 - 1.51 kg C mol-1 leu, which are comparable to the low end of published leucine conversion factors for marine chemoheterotrophic bacterioplankton production. The molar ratio of elements C:N:P in growing cells was on average 25:6:1, significantly less than the mean (~50:10:1) for heterotrophic bacteria, indicating these strains are C and N poor relative to P.
Data from: Elemental content and stoichiometry of SAR11 chemoheterotrophic marine bacteria
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Data from: Biological stoichiometry of oleaginous microalgal lipid synthesis: The role of N:P supply ratios and growth rate on microalgal elemental and biochemical composition
Open the record for dataset details and reuse information.
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