SSS 2012-08-23
时间：2013-01-06 08:49:10
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（单词翻译）
One day the banana is perfect- bright yellow, firm, flavourful. But even within the same day, brown spots can appear on your perfectly1 ripe banana. Its flesh turns mushy and it's destined2 for the compost or at best banana bread.
But scientists are developing a way to extend the life of ripe bananas. It's spray-on coating made from chitosan, substance found in
crab3 and
shrimp4 shells. The new gel can sprayed on bananas to slow the
ripening6 process by up to twelve days.
Like other fruit, bananas remain alive after being picked and actually continue to respire. This means that they take oxygen and release carbon dioxide. The more the banana breathes, the faster it
ripens7 and then rots. Bananas
ripen5 more quickly than most fruit because they don't naturally slow the
respiration8 after being picked, in fact it speeds up, causing bananas to become mushy.
Chitosan not only kill the bacteria on banana's skin that leads to rot, it also significantly slows down the respiration in the first place. So bananas won't drive you bananas.
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