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alpha_.
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buona sera a tutti,
sto facendo un corso di mathematical biology e stavo cercando di fare gli esercizi di fine capitolo del libro di testo ma ho delle difficoltà: vi riporto il testo:(IN INGLESE)
By means of the patch clamp measuring technique one is able to measure
the ionic current through a single Na+ selective ion channel that is located
in a tiny ‘patch’ of the membrane that has been sucked out by means of a
micropipette. In such an experiment one may measure a current through
an open channel of −6.6 pA, when the cross membrane potential is −140
mV. The channel is open, on average, during a time period of about 6 ms.
(a) Compute the number of ions that pass the channel per second.
(b) Assuming that the ions pass the channel sequentially, one at a time,
how long does it take a single ion to cross the 5 nm long channel
on average? Hence, what is their average velocity when passing the
channel?
(c) How many ions pass the single channel on average, when open?
(d) Compute the conductivity of the single open channel, given that the
Nernst potential is +56 mV.
Qualcuno saprebbe aiutarmi?.
esercizi |