The name is absent

99

current) in the follower cell.

V₀ - Rin2D^0 + Rin2D^,ilK

-                                                              (5.17)

r?l = R_m2_DZ_QK + Rin2Dil
■ _l.

From the second relationship, if tq is assumed to be 0 because the follower cell is held at the
rod resting potential then:

Rin2D^l ~ ~Rirι2D∣oR
κ---ⁱ-÷-

Divide the first relationship in system 5.17by z_i and substitute in K

^7^^ = Rin2D^r^ ~ Rin2D^T-                            (5.18)

Zl           Zi           Zo

from our definition of network resistance between adjacent cells (R apparent) R_a = v₀∕iι

2o             ∕?

Rin2D = 7^-^il ■ ⅝ = T---½∙                       (5.19)

∖ iɪ io /      ∖ iɪ io /

The input impedance for all pairs estimated from equation 5.19 is shown in figure 5.7.

The mean R_i∏2D was 137 MΩ, which is in line with our experience from recording from rod
photoreceptors. Figure 5.9 A shows the estimates of R_in2D for ^each pair of cells, and figure
5.9 B shows a box plot with the means, 25th and 75th percentiles of the same data.

From the previous set of equations we can also solve for how R_a varies with R_i∏2D and
A₂d∙ Substituting K back into equation 5.18 yields

— = R_a = ~R_iJK + R_inK
•              Lt               tlt∕                  t / t

Zi                   .

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