haem (countable and uncountable; plural haems)
- The component of haemoglobin responsible for binding oxygen, consists of an iron ion that binds oxygen and a porphyrin ring that binds the globin molecules; one molecule binds one molecule of oxygen.
- 2010, Pierre Cornelis and Simon Andrews (editors), Iron Uptake and Homeostasis in Microorganisms, page 17:
- Haem is ubiquitous, abundant and necessary for energy metabolism. Most bacteria have a haem biosynthesis pathway, but nevertheless, since haem is a major source of iron (an essential metal), microbes take up exogenous haem to retrieve iron.
Last modified on 9 April 2011, at 12:54