...optical scanning to read the results (what else might you use?) There's been some research into using piezoelectric elements coated with antigen or other re

...optical scanning to read the results (what else might you use?) There's been some research into using piezoelectric elements coated with antigen or other reactive surfaces. A positive result (meaning antibodies are attaching themselves to the substrate) would change the resonant frequency of the surface. http://www.sciencedirect.com/science/article/pii/S0003267000009430 http://www.sciencedirect.com/science/article/pii/S0003267000...