"Iron uptake" refers to the process by which living organisms absorb or take in iron from their surroundings, usually to meet their physiological needs. Full definition
Meat contains a special form of iron that gives the body a great iron uptake but at the same time it may increase the amount of free radicals that are harmful to us. (foodpyramid.com)
(b) there are other pathways for iron uptake, but these are not preferred by most plankton, but may develop and (ecoshock.org)
The inhibition of growth has been achieved through the deprivation of iron uptake using an artificial metalloprotein. (sciencedaily.com)