- n. 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.
- n. a complex red organic pigment containing iron and other atoms to which oxygen binds
“And this leaves just the central core of the haemoglobin called the haem group, which is what's known as a porphyrin ring.”
“Non-haem" iron from plant foods such as baked beans, nuts, seeds and dark green, leafy vegetables is less well absorbed than "haem" iron in meat.”
“Other nutritional virtues include the easily absorbed iron known as "haem" iron.”
“Experts suspect that haem, the pigment which gives red meat its color, damages cells in the digestive system, which may lead to cancer.”
“Haem iron is most readily absorbed by the body and also increases the uptake of non-haem iron.”
“Haem iron is only found in animal tissues, non-haem iron is found in grains, fruits, vegetable, legumes, nuts and eggs.”
“Most striking was the finding that depletion of haem, and addition of GSSG or dsRNA all seemed to have similar effects on cell-free protein synthesis in the reticulocyte lysate, as though these disparate agents all acted in a similar manner.”
“Together with Tony Hunter, a fellow student, I became interested in the question of when the haem was inserted into globin to make haemoglobin, and the question of whether ribosomes had to queue up under conditions where iron (and hence haem) was limiting.”
“It took three or four years to realise that this inhibition was due to the action of at least two inhibitors of the process, one activated by the absence of haem, the other by the presence of dsRNA, and that these inhibitors were protein kinases, which phosphorylated eIF-2, the key initiation factor that catalysed the binding of”
“New York to work with Irving, who had long been interested in the haem question.”
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