Porphyrin


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Related to Porphyrin: porphyria

porphyrin

 [por´fĭ-rin]
any of a group of iron- or magnesium-free cyclic tetrapyrrole derivatives, occurring universally in protoplasm, and forming the basis of the respiratory pigments of animals and plants; in combination with iron they form hemes. Examples include coproporphyrin, hematoporphyrin, protoporphyrin, and uroporphyrin. See also porphyria.

por·phin

, porphine (pōr'fin),
The unsubstituted cyclic tetrapyrrole nucleus that is the basis of the porphyrins.
See also: porphyrins. Compare: chlorin, phorbin, corrin.
Synonym(s): porphyrin

porphyrin

(pôr′fə-rĭn)
n.
Any of various organic compounds containing four pyrrole rings, occurring universally in protoplasm, and functioning as a metal-binding cofactor in hemoglobin, chlorophyll, and certain enzymes.

porphyrin

an organic compound consisting of four pyrrole rings linked by CH bridges with a heavy metal in the centre. Porphyrins form part of several important biological molecules. Examples include the haem group of HAEMOGLOBIN and MYOGLOBIN (see Fig. 258 ), chlorophyll (with magnesium) and cytochromes (with iron).

Porphyrin

A type of pigment found in living things, such as chlorophyll, that makes plants green and hemoglobin which makes blood red.
References in periodicals archive ?
In their study, the authors tested the effects of a prototypic antioxidant of the class of manganese porphyrins in an established preclinical model for aqueous-deficient dry-eye disease and found that their formulation was superior to the therapeutic effect observed by the current clinical standard of care, cyclosporine emulsion.
The first one points out the formation of the complex between porphyrin and Ag nanoparticles and the second one is in connection with the strong shifting to the red of the hybrid band and producing its widening up to 650 nm, probably due to an electrostatic equilibrium between materials with opposite charges.
The increase in fluorescence emission is probably related to the displacement of the magnesium atom from the porphyrin ring.
An isosbestic point is detectable at 645 nm on the last Q band of the porphyrin (Figure 6(b)).
Galoppini, "Tetrachelate porphyrin chromophores for metal oxide semiconductor sensitization: effect of the spacer length and anchoring group position," Journal of the American Chemical Society, vol.
Table 1: Edge partition of Porphyrin dendrimers based on degree of end vertices of each edge.
Clinically important features of porphyrin and heme metabolism and the porphyrias.
Here we consider a third class of biomolecules which exhibit phase conjugation behavior as alternative locations for the holographic grating than that formed by porphyrin networks.
As the porphyrin concentration increased, TMPyP4 started to stack along the DNA.
Facile synthesis of a flexible tethered porphyrin dimer that preferentially complexes fullerene [C.sub.70].