Optical qualities 4 Optical quality 4 Silica 4 Sol-gel process 4 Algae 2 Alginates 2 Bioactive material 2 Biosensing Techniques 2 Biosensing platforms 2 Biosensor 2 Biosensors 2 Chlamydomonas reinhardtii 2 Chlorella vulgaris 2 Cluster densities 2 Coagulation 2 Condensation 2 Distillation 2 Elementary particles 2 Esterase activities 2 Esterase activity 2 Esterases 2 Ethanol 2 Fractal dimension 2 Gelation 2 Gels 2 Glucuronic Acid 2 Gyration radii 2 Hexuronic Acids 2 Hydrogels 2 Low pressures 2