Fig. 5From: Hormesis effects of phosphorus on the viability of Chlorella regularis cells under nitrogen limitation31P NMR spectra and P 2p XPS spectra in C. regularis cells, with magnified TEM and P elemental mapping images inserted. The yellow arrows indicate poly-P granules. The red circle shows the inner cell area, the orange circle shows the cell wall area. The data from the red and orange circles indicates the weight percentage of P in the circle area, ND means not detectedBack to article page