Model approaches for the evaluation of electrical cell coupling in the salivary gland of the larva ofDrosophila hydei. The influence of lysolecithin on the electrical coupling

Cell communication: A cyclic-AMP mediated phenomenon

“…2A, B). Those permeability changes are significant as can be deduced from error estimates (van Venrooij et al, 1974) as well as from the fact that the reactions of all the glands are similar. It follows from these findings that passive electrical cell communication is increased.…”

“…2A and one point in 2B. The companion paper (van Venrooij et al, 1974) describes the analytical machinery for generating the estimates of junctional and nonjunctional membrane resistances. Furthermore, it is indicated in that paper that the morphological as well as t h e " arithmetic" errors are not relevant, if measurements on the same gland are compared.…”

“…All measuring series were assayed for usefulness by calculating the confidence interval. Those series referring to glands which meet the requirements of the reliability criterion (van Venrooij et al, 1974) during the whole experiment, were used for Figs. 2-5.…”

“…Electrophysiological procedures and data processing as described in the companion paper (van Venrooij et al, 1974) were applied to determine junctional and nonjunctional membrane resistances. All measuring series were assayed for usefulness by calculating the confidence interval.…”

“…With the help of these models, junctional (R3 and nonjunctional (R,) membrane resistance estimates may be derived with an accuracy of about 10% from electrotonic spread measurements (van Venrooij, Hax, van Dantzig, Prijs & Denier van der Gon, 1974). Also the capacity can be computed for the nonjunctional membrane part.…”