BIOSENSOR 3 BIOSENSORES 3 EFECTOS DE VOLUMEN EXCLUIDO 3 ESTRES OSMOTICO 3 EXCLUDED VOLUME EFFECTS 3 FLUORESCENT PROTEINS 3 FORSTER RESONANCE ENERGY TRANSFER (FRET) 3 FRET 3 FUSION PROTEINS 3 HACINAMIENTO MOLECULAR 3 MACROMOLECULAR CROWDING 3 OSMOTIC STRESS 3 PROTEINAS DE FUSION 3 PROTEINAS FLUORESCENTES 3