在线观看亚洲精品专区-在线观看亚洲免费-在线观看亚洲免费视频-在线观看亚洲欧美-欧美freexxx-欧美free嫩交video

食品伙伴網(wǎng)服務(wù)號
 
 
當(dāng)前位置: 首頁 » 專業(yè)英語 » 專業(yè)知識 » 正文

What is the role of vitamins as anti-oxidants?

放大字體  縮小字體 發(fā)布日期:2007-06-07
核心提示:Vitamins such as C, E and beta-carotene (a precursor of vitamin A) as well as the mineral selenium have anti-oxidant properties. This means that they protect weak proteins and lipids in the cell membranes and play an important role in intercepting h

Vitamins such as C, E and beta-carotene (a precursor of vitamin A) as well as the mineral selenium have anti-oxidant properties. This means that they protect weak proteins and lipids in the cell membranes and play an important role in intercepting highly reactive oxygen atoms (“free radicals”). They scavenge free radicals, which are molecules with one or more unpaired electrons. They react rapidly with other molecules, starting chain reactions in a process called oxidation. Free radicals are a normal product of metabolism and the body produces its own antioxidants to keep them in balance. However, stress, ageing and environmental sources such as polluted air and cigarette smoke can add to the number of free radicals in the body, creating an imbalance. The highly reactive free radicals can damage healthy DNA and have been linked to changes that accompany ageing (such as age-related macular degeneration, a leading cause of blindness in older people) and with disease processes that lead to cancer, heart disease, and stroke.

Studies have suggested that the natural antioxidants in fresh fruits and vegetables have a protective effect. For example, vitamin E and beta-carotene appear to protect cell membranes; vitamin C removes free radicals from inside the cell.

更多翻譯詳細(xì)信息請點(diǎn)擊:http://www.trans1.cn
 
關(guān)鍵詞: and the in radicals free as to that have of with
[ 網(wǎng)刊訂閱 ]  [ 專業(yè)英語搜索 ]  [ ]  [ 告訴好友 ]  [ 打印本文 ]  [ 關(guān)閉窗口 ] [ 返回頂部 ]
分享:

 

 
推薦圖文
推薦專業(yè)英語
點(diǎn)擊排行
 
 
Processed in 3.673 second(s), 651 queries, Memory 2.69 M
主站蜘蛛池模板: 国产午夜精品片一区二区三区 | 欧美成人aaa大片 | 国产精品欧美激情在线播放 | 日韩三级中文字幕 | 波多久久夜色精品国产 | 亚洲成人高清 | 亚洲淫视频 | 香蕉视频国产在线观看 | 久久99精品福利久久久 | 亚洲第一免费网站 | 狠狠干狠狠干狠狠干 | 久久国产免费观看精品 | 黄色毛片基地 | 第一福利在线 | 好吊色7777sao在线视频观看 | 欧美三级一区二区 | 色婷婷丁香| 亚色在线 | 年轻护士女三级 | 业余性自由色xxxx视频 | 欧美黑人性色黄在线视频 | 色噜噜狠狠狠狠色综合久一 | 小屁孩和大人啪啪 | 午夜 dy888理论久久 | 97影院理论在线观看 | 国产成人精品怡红院 | 免费一级特黄a | 国产成人a一区二区 | 成人丁香婷婷 | 性 色 黄 一级 | 老师下面很湿很爽很紧 | 伊人伊成久久人综合网777 | 日本三级带日本三级带黄首页 | 日韩黄色网 | 亚洲a成人 | 天天干天天操天天插 | www.色爱| 亚洲日本欧美日韩高观看 | 日本三级黄在线观看 | 奇米影视999 | 免费网站直接看 |