科学美国人60秒 SSS 2014-01-06（在线收听） |
The warm waste environment of your mouth makes it a great place for bacteria, some of which keep busy causing cavities. Such dental difficulties were thought to a really taken-off for we switch from hunting gathering to agriculture and had a ready supply of farmed fermentable carbohydrates. Now research shows that at least some pre-agricultural humans also had a bad case of tooth decay. The study is in the proceedings of the National Academy of Sciences.
One hundred gatherers resided in Morocco called GlutoPeijohn was a key ritual and economic center. The deposits there date to some 15,000 years ago and are incredibly dry, so organic material, including bones and chart plan remains are well preserved.
Researchers found leftover panmites junifer, perstashio, wild oats, and particularly popular carbohydrate reach icornts, eaten and raw or as flour, yicornts can sticken in teeth. The food stuff makes a happy home for acid-loving bacteria that cause cavities.
The scientists also analyzed teeth from 52 partial or complete jaws. They found that more than half the teeth showed signs of lesion and only three of the adults were cavity-free, thousands of years before folks in the area learned to farm. |
| 原文地址：http://www.tingroom.com/lesson/sasss/2014/1/249287.html |