A heme (HEM) is a multi-atom, non-proteinaceous organic structure capable of positioning an iron (FE) ion in its center.
亚铁血红素 (HEM) 是一个多原子、非蛋白质的有机结构，能够将一个铁 (FE) 离子置于其中心。
2
When this occurs, the chromium (Crn+) separates from the surface and opens the way for oxidation of the iron (Fe) and nickel (Ni), lower in the metal lattice.
当出现这种情况时候，铬（Crn+）就会和表面分离，将材料筛格下层的铁（Fe）和镍（Ni）暴露氧化。
3
The influence of graded levels of diet calcium (Ca) and ascorbic acid (AA) on the retention of iron (Fe), copper(Cu), Zinc (Zn), Ca, phosphorus (P) and magnesium (Mg) was studied in the guinea pig.