However, new annotations are not the primary objective for building detailed genome-scale metabolic models. More importantly, a genome-scale model provides a theoretical framework in which experimental observations can be interpreted and understood. Computational analyses allow to query the model, assess ...
Because nitrogenase can be inhibited by oxygen, free-living organisms behave as anaerobes or microaerophiles while fixing nitrogen. Because of the scarcity of suitable carbon and energy sources for these organisms, their contribution to global nitrogen fixation rates is generally considered minor. Howeve...
Increases in the total nitrogen content of a system can be used to estimate the fixed nitrogen. Inorganic nitrogen is taken up by plants in the form of nitrate, although in some circumstances, ammonium ions may also be assimilated. In addition, a number of free-living bacteria and symbiotic ...
Partial nitrate assimilation in the photic zone also causes equivalent increases in the δN and δO of the residual nitrate that can be transported into the interior. However, the regeneration and nitrification of sinking N can be said to decouple the N and O isotopes of deep ocean nitrate, ...
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Larger input of nitrogen comes from nitrogen fixed by microorganisms, called diazotrophs. Nitrogen input from legumes can be a sustainable source of nitrogen in agricultural systems. The symbiotic microorganisms in the root nodules, the rhizobia, can take up gaseous di-nitrogen from the air and “...
This work enabled us to identify, at the whole genome level, xylem genes differentially regulated by N availability, some of which are involved in the environmental control of xylogenesis. It further illustrates that N fertilization can be used to alter the quantity and quality of lignocellulosic ...
First-principles study revealed that Pt nucleation is favorable on pyridinic and pyrrolic N, and the center of d-band can be shifted downward by the nitrogen species [69]. Thus, the species on the NPC could be attributed to the increase in interactions between the Pt nanoparticles and NPC ...
How metabolic genes can be enriched in this group, while the total proteomic and transcriptomic allocation to metabolic processes remained fixed (Fig. 2b-c), can be explained by the observation that abundance of metabolic enzymes had a higher propensity to be internally adjusted within a given ...
host, which is likely to have been facilitated by the lack of AMT transporters inCa. T. diatomicola (Fig.3a,c). As such, the symbiont fixed 100-fold more nitrogen than would be needed for its own growth, which is similar to previous reports for N2-fixing cyanobacteria–diatom symbioses26...