Shocking heat

 作者:霍惕     |      日期:2019-03-08 05:02:00
HIGH temperatures can have a lasting effect on the nervous system, say biologists in the US and Canada. Nino Ramirez of the University of Chicago noticed that locusts that were transferred from a cool climate to a hot desert had trouble flying, but if they were given a brief heat shock before release, they could fly normally. To find out what caused this effect, Ramirez and Meldrum Robertson of Queen’s University at Kingston in Ontario, exposed 50 locusts to a temperature of 45 °C for three hours and monitored the neurons in the insects’ brains. They found less potassium flowed out of the cells in heat-shocked insects (Journal of Neurophysiology, vol 81, p 795). “Communication within the nervous system is changed,” says Ramirez,