Is the quantum of transmitter release composed of subunits?

D. C. Miller, M. M. Weinstock, Karl Magleby

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Abstract

The quantal theory of transmitter release proposed by del Castillo and Katz states that the endplate potential is built up of unit potentials (quanta), each of which is the size of the spontaneously occurring miniature endplate potentials (m.e.p.p.s). It has recently been proposed that unit potentials and m.e.p.p.s are built up of 2-15 still smaller subunits. The basis for this proposal has been drawn in part from two observations. First, some preparations show a distinct class of small mode m.e.p.p.s of amplitude typically about 1/7 that of the average m.e.p.p. Second, amplitude histograms of m.e.p.p.s display multiple peaks whose amplitudes sometimes appear to be integer multiples of the small-mode m.e.p.p. amplitude. We now present evidence on frog suggesting that the peaks on histograms of m.e.p.p. amplitudes may arise from random variation in the data due to a limited sample size. The data do not support the proposal that m.e.p.p.s and unit potentials are composed of 2-15 subunits.

Original languageEnglish
Pages (from-to)388-390
Number of pages3
JournalNature
Volume274
Issue number5669
StatePublished - Dec 1 1978

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Miller, D. C., Weinstock, M. M., & Magleby, K. (1978). Is the quantum of transmitter release composed of subunits? Nature, 274(5669), 388-390.

Is the quantum of transmitter release composed of subunits? / Miller, D. C.; Weinstock, M. M.; Magleby, Karl.

In: Nature, Vol. 274, No. 5669, 01.12.1978, p. 388-390.

Research output: Contribution to journalArticle

Miller, DC, Weinstock, MM & Magleby, K 1978, 'Is the quantum of transmitter release composed of subunits?', Nature, vol. 274, no. 5669, pp. 388-390.
Miller DC, Weinstock MM, Magleby K. Is the quantum of transmitter release composed of subunits? Nature. 1978 Dec 1;274(5669):388-390.
Miller, D. C. ; Weinstock, M. M. ; Magleby, Karl. / Is the quantum of transmitter release composed of subunits?. In: Nature. 1978 ; Vol. 274, No. 5669. pp. 388-390.
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