vitamin precursor的例句大全

5-Aminolevulinic acid ( ALA) is a common precursor in the biosynthesis of tetrapyrrole compounds such as porphyrins, chlorophyll, heme and vitamin B12, widely exists in the cells of microorganisms, plants and animals.

5-氨基乙酰丙酸（5-aminolevulinic acid，ALA）是生物合成卟啉、叶绿素、亚铁血红素和维生素B12等四吡咯化合物的共同前体物质，广泛存在于微生物、植物和动物细胞中。

the rice gets its golden hue from an excess of beta carotene, a precursor to vitamin a that could help half a million children who go blind each year from an often-fatal vitamin a deficiency.

这种大米因为富含贝塔胡萝卜素而获得这种金色，贝塔胡萝卜素是维生素A的前体，它可能帮助每年因为一种常常致命的维生素A缺乏症而失明的50万儿童。

3-Diethoxyethylcyanide was an important precursor for synthesis of vitamin B1, cytosine and its derivatives.

3-二乙氧基丙腈是合成维生素B1、胞嘧啶及其衍生物等重要化合物的前体。