An S4 class to represent a 2-state pH sensor

Slots

Rmin

To represent the ratio emission value R in the protenated state

Rmax

to represent the ratio emission value R in the deprotenated state

delta

To represent the ratio between emission in the deprotenated and protenated states in the second wavelength of the ratio.

pKa

The midpoint/pKa of the pH sensor