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Fig. 4. T-potentials in nematocytes of Stauridiosarsia
(A–C,F–H), Coryne (D) and Dipurena (E). Membrane
voltage (upper traces) and probe excursion (lower traces) as in
Fig. 2. (A) T-potentials
induced by contacts of the probe with an area of the tentacle distant from
nematocytes; the first response of Aa is enlarged in Ab. (B) A
hyper-/re-polarizing component was observable at depolarizing membrane
voltage. (C–E) Representative waveforms of T-potentials recorded from
nematocytes of Stauridiosarsia (C), Coryne (D), and
Dipurena (E). E 2 shows the superposition of L- and T-potentials,
typically occurring in Dipurena upon mechanical stimulation of
nematocytes or, here, pulling at the stinging thread of a discharged
nematocyst. (F 1,2) Series of T-potentials following an L-potential that was
induced by a discharge-triggering stimulation of a distant nematocyte; F 2 is
a section of the same `tail' of T-potentials, recorded 1 min after F 1. (G)
Time course of amplitude and instantaneous frequency of the series of
T-potentials illustrated in F. (H) Mean (± s.d.) of the hyperpolarizing
component of T-potentials as a function of the instantaneous frequency of
preceding T-potentials (intervals averaging 20 s; N=number of
trials).
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