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Carbon (C) and nitrogen (N) are the primary elements involved in the growth and development of plants. The C:N ratio is an indicator of nitrogen use efficiency (NUE) and an input parameter for some ecological and ecosystem models. However, knowledge remains limited about the convergent or divergent variation in the C:N ratios among different plant organs (e.g., leaf, branch, trunk, and root) and how...
The allocation of limiting elements, such as nitrogen (N) and phosphorus (P), in plants is an important basis for structural stability and functional optimization in natural plant communities. However, because of the lack of systematic investigation data, the mechanisms of optimal nutrient allocation in plants in natural forests are still unclear. Using consistent measurements of N and P contents...
AC-DC converter transformer is one of the most important equipments in the high-voltage D.C. transmission system. And the mineral insulating oil and pressboard immersing in oil are important insulation dielectrics used in AC-DC converter transformers. Thus, it is very significant to understand the dielectric properties of the mineral insulating oil and oil-pressboard. In this paper, the DC breakdown...
Leaf morphology and the leaf protein expression profiles of flue-cured tobacco grown in central Henan province of China under low nitrogen (low-N) and normal nitrogen (normal-N) nutrition were examined. The leaf length and width were measured at 50, 60, and 70 days after transplanting. Leaves grown under low-N conditions were shorter and more narrow than those grown under normal-N conditions. The...
COD, TN and TP removal efficiency was studied in different C / N in the system by changing the dosage of CH3COONa. The best results obtained by experiment is that when the C / N is between 4 and 6. The average COD effluent concentration is 40.08mg / L, the removal rate is 87.5%;the average TN effluent concentration is 9.32 mg / L, the removal rate is 83.91%; the TP average effluent concentration is...
The principium of Denitrifying Phosphate Removal Bacteria was summarized in this article. study on influential factors of the Denitrifying Phosphate Removal such as carbon source, temperature, MLSS and pH, Which can provide reference and foundation for the denitrifying phosphorous removal process.
As A2N is two-sludge system, by using the method that first bringing up the cultivation of denitrifying phosphorus removing bacteria (DPB) and nitrification biofilm separately then connecting them, which can start up A2N system successfully. Nitrification biofilm was cultivated in a sequencing batch reactor (SBR), the activated sludge used is from the sedimentation tank, after 30 days, NH4+-N effluent...
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