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tetrapyrroles definition

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Natural pigments containing four pyrrole rings joined by one-carbon units linking position 2 of one pyrrole ring to position 5 of the next. Porphyrins are macrocyclic tetrapyrroles. BNRD, Nomenclature of tetrapyrroles, introduction (p. 279). E.g. bilin (a linear tetrapyrr

See also:

theoretical plates definition
thermal transition definition
Thermogravimetry (TG) definition
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thermal shock definition