CAN THE GATE SEE IT?
Sensed, faded, or screened?
Charge only reaches the channel within a few Debye lengths. Estimate λD ≈ 0.3 nm ÷ √c, with c in mol/L, then compare it with the receptor's height. Under 1 λD is sensed, 1 to 3 is faded, and over 3 is screened.
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CHALLENGE COMPLETE
🧂 You can size up screening
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Compare the height of the charge with the Debye length. Salty samples and tall receptors are the worst combination, and dilution or small receptors are the fix.