provitamin

1. Flavourful, juicy and refreshing, the apricot possesses one of the highest levels of minerals and provitamin A.
   香气浓郁，多汁，清凉解渴，杏子是含矿物质和维生素原A最丰富的水果之一。
2. GM technology is also being used to enhance provitamin A content in the mustard plant, a relative of canola ( oil seed rape) that is grown in many parts of the world, including Bangladesh and India.
   转基因技术也被用来提高芥菜植物的维生素原A含量，这种植物是canola油菜的近亲，在世界上许多地方生长，包括孟加拉和印度。
3. Rich in provitamin A, vitamin C, potassium, magnesium and fibre, papaya is one of the most nutritious cultivated fruits.
   富含维生素原A、维生素C、钾、镁、纤维素的木瓜是一种极有营养价值的人口培育水果。
4. Genetically engineering rice to produce provitamin A ( beta-carotene) has received a lot of attention as a way to tackle this widespread nutritional deficiency.
   转基因处理的水稻能产生维生素原A（β-胡萝卜素），作为一种对付广为流行的营养缺乏的方法，它得到了很多关注。
5. Questions have also been asked about the stability of the provitamin during storage and post-harvest processing, as well as its thermal stability during cooking.
   也有人就维生素原在水稻的储存、收获后加工过程的稳定性，以及烹调过程中的热稳定性提出疑问。
6. Preparation and application of provitamin concentrate from pine needles
   松针维生素原浓缩物的研制和应用
7. Effects of laser irradiation time and concentration of 7-DHC on photochemistry of provitamin D_3
   激光辐照时间及7-DHC浓度对维生素D3的光化学影响

noun

1. vitamin precursor