4 nitrophenol article 6 aluminum oxide 4 4-Nitrophenol 2 4-Nitrophenol reduction 2 Alumina 2 Animals 2 Enzyme Stability 2 Eukaryota 2 Extracellular hydrolase 2 Glycerophosphocholine phosphodiesterase 2 Glycerylphosphorylcholine 2 Gold Nanoparticles 2 Gold nanoparticles 2 Hydrogen-Ion Concentration 2 Kinetics 2 Label-free sensing 2 Lipid metabolism 2 Lysosomal 2 Lysosomes 2 Membrane modification 2 Membranes 2 Metal nanoparticles 2 Phosphatidylcholines 2 Phosphoric Diester Hydrolases 2 Phosphorylcholine 2 Polyallylamine-dodecyltsulfate membrane modification 2 Polycarbonate 2 Polycarbonates 2 Polyelectrolyte-surfactant complex 2