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9 results for “N:P ratio”
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: Biological stoichiometry of oleaginous microalgal lipid synthesis: The role of N:P supply ratios and growth rate on microalgal elemental and biochemical composition
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Figure 4. Optimization of the lyophilized nanoparticles at a N:P 2:1 ratio
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Figure 3 Effect of N:P ratios on the H2B-mScarlet expression in transfected HEK293 cells.
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Vegetation N:P ratio stoichiometric is a driver of negative density dependence in a succession series of a semi-arid area
<p>Plant negative density dependence is the result of interactions between plants and between plants and the environment. We selected a succession series, i.e., early successional, mid-successional and late successional stages<i> </i>for <i><span>Artemisia ordosica</span></i>, <i><span>Sophora alopecuroides</span></i> and <i><span>Stipa bungeana</span></i> communities, respectively, in a semi-arid area. We investigated the density and biomass and determined the nitrogen (N) and phosphorus (P) content of every plant species for each quadrat of 225 quadrats, and calculated the N and P content of vegetation using biomass as a weighted coefficient. The results show that, total plant density of the <i><span>A. ordosica</span></i><i> </i>community increased with the increase of vegetation N:P ratio, while total plant density of the <i><span>S. bungeana</span></i> community decreased with the increase of vegetation N:P ratio, which took on negative density dependence at the late successional stage. In the early and mid-successional stages of the community succession, the stagnation point of the quadratic function relationship between plant total density and vegetation N/P ratio was (16.6, 353.3), that was, if the N:P ratio of the vegetation was greater than 16.6, which was characterized by negative density dependence. The analysis shows that the negative density dependence is due to P limitation. These findings reveal that the vegetation N:P ratio in a semi-arid region is the driving force for negative density dependence.</p>
Community-level leaf N:P Ratios in terrestrial ecosystems in China
<p>Community-level leaf N:P ratios in terrestrial ecosystems (e.g. forests, grasslands, and deserts) in China were calculated using the biomass-weighted mean and species-arithmetic mean.</p>
Vegetation N:P ratio stoichiometric is a driver of negative density dependence in a succession series of a semi-arid area
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Community-level leaf N:P Ratios in terrestrial ecosystems in China
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Ocean warming and acidification affect the transitional C:N:P ratio and macromolecular accumulation in the harmful raphidophyte Heterosigma akashiwo
GEO Series GSE223198. Heterosigma akashiwo. 6 samples. Type: Expression profiling by high throughput sequencing.
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