官方APP下载:英语学习播客(支持苹果手机、安卓手机)
创办于2003年
UNSV记不住?那就记中文谐音“忧安思危”吧!
  Slow and Steady Wins the Race!
UNSV英语学习频道 - Slow and steady wins the race!
公众微信服务号(英语全能特训)
英语全能特训(微信公众服务号)
UNSV英语学习频道淘宝网店
客服短信:18913948480
客服邮箱:web@unsv.com
初级VIP会员
全站英语学习资料下载。
¥98元/12个月

AGRICULTURE REPORT - Plants that Absorb Metals

作者:George Grow 发布日期:9-25-2001

This is the VOA Special English AGRICULTURE REPORT.

Too much metal in the soil is considered pollution. Yet too little metal in a person's diet can cause health problems. An American scientist says the answer to both problems may be plants that take up large amounts of metal in their tissues.

David Salt is an expert on plants at Purdue University in West Lafayette, Indiana. He is working with plants that store large amounts of metals.

In recent years, scientists have shown interest in using such plants to clean up harmful waste materials. Professor Salt says such plants also could be used to improve people's diets or even to create foods that fight cancer.

Humans need a number of metals in their diets, including iron and zinc. These metals are needed in very small amounts, however. That is why they are called micronutrients. The lack of micronutrients is blamed for health problems in many developing countries. Children and pregnant women are mostly affected.

Recently, Mister Salt announced that he has identified and copied the genes from a kind of plant that stores metals in its tissues. The Proceedings of the National Academy of Sciences published his findings.

Mister Salt says his study suggests it may be possible to develop plants that contain minerals needed for good health.

For example, the metal selenium is a strong anti-cancer agent. Some wild plants store selenium naturally. Mister Salt says foods to fight cancer might be created if genes from these plants could be moved into crop plants.

A plant called locoweed stores selenium. Locoweed is common in the western United States. Mister Salt says it may be possible to create cancer-fighting foods from locoweed. He and scientists from a company called NuCycle Therapies have copied the gene that causes locoweed to take up selenium from the soil.

Many people take pills to add important minerals or vitamins to their diet. However, Mister Salt notes that most selenium products sold in health food stores are of little use. That is because the human body can only take in and use selenium if it is in the right chemical form.

The scientist says his team would like to develop a vegetable crop high in selenium. He wants to create an anti-cancer product in the foods we already eat.

This VOA Special English AGRICULTURE REPORT was written by George Grow.

版权所有©2003-2019 南京通享科技有限公司,保留所有权利。未经书面许可,严禁转载本站内容,违者追究法律责任。 互联网经营ICP证:苏B2-20120186
网站备案:苏公网安备 32010202011039号苏ICP备05000269号-1中国工业和信息化部网站备案查询
广播台