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A new study of living cells could revolutionize the way we test drugs

nsparency of cellular membranes which we hoped would give a signal we could detect," says Dr Irina Barbolina, who carried out the experiments.

It worked. As soon as the yeast got a taste of the vodka, the probe registered an electrical signal. A drunken hiccup perhaps? "It was probably the last gasp of the dying cell," says Professor Geim. The researchers had added so much ethanol that it poisoned the cell.

Although not the cardiogram they had hoped for, the electrical signal was the smallest yet detected from a living cell, around 100 times smaller than anything previously detected. It added up to an electrical current of just 10 moving electrons. It has given the team confidence that equipment sensitive enough to measure a cell’s heartbeat can be developed.

"We already have some ideas about how to improve the sensitivity of the detector in water and next time we will also use a more active micro-organism such as an amoeba. Yeast is a subdued organism and doesn’t generate much activity," says Professor Geim. "Probably, the most important outcome is that we defined an important goal. Cellular cardiograms can no longer be seen as absurd or science-fictional. If not us then someone else will soon develop a technique sensitive enough for such studies."
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Source:Engineering and Physical Sciences Research Council


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