Porphyrin - Wikipedia
网页Porphyrins (/ ˈpɔːrfərɪn / POR-fər-in) are a group of heterocyclic, macrocyclic, organic compounds, composed of four modified pyrrole subunits interconnected at their α carbon atoms via methine bridges (=CH−).
Porphyria - Symptoms and causes - Mayo Clinic
网页2023年4月5日 · High levels of porphyrins can cause major problems, mainly in the nervous system and skin. There are two general types of porphyrias. Acute porphyrias start rapidly and mainly affect the nervous system. Cutaneous porphyrias mainly affect the skin. A few types of porphyrias affect both the nervous system and the skin.
Porphyrin - Definition, Types and Quiz | Biology Dictionary
网页2018年3月15日 · A porphyrin is a large ring molecule consisting of 4 pyrroles, which are smaller rings made from 4 carbons and 1 nitrogen. These pyrrole molecules are connected together through a series of single and double bonds which forms the …
Porphyrin | Photosynthesis, Heme, Proteins | Britannica
网页Porphyrin, any of a class of water-soluble, nitrogenous biological pigments (biochromes), derivatives of which include the hemoproteins (porphyrins combined with metals and protein). Examples of hemoproteins are the green, photosynthetic chlorophylls of higher plants; the hemoglobins in the blood.
Porphyrin Tests: MedlinePlus Medical Test
网页Porphyrin tests measure the level of porphyrin in your blood, urine, or stool. It's used to diagnose a rare group of disorders called porphyrias. Learn more.
Porphyrin - an overview | ScienceDirect Topics
网页Porphyrin is a general term for homologues and derivatives that have substituents on the outer ring of porphin. Porphine is a large π-conjugated system bridged by 4 pyrrole rings and 4 methine groups, which is aromatic.
Laboratory Diagnosis of Porphyria - PMC - National Center for ...
网页2021年7月26日 · Elevated levels of porphyrins and porphyrin precursors in the plasma, erythrocytes, urine, or feces are critical in determining the role of a novel mutation in causing the disease.
Porphyria | New England Journal of Medicine
网页2017年8月31日 · Each type of porphyria involves a defect, either inherited or acquired, in a pathway enzyme. When the defect is physiologically significant, it results in overproduction of pathway precursors ...
Porphyrin Tests - Understand the Test & Your Results - The Merck Manuals
网页Porphyrin tests measure the level of porphyrins in your blood, urine, or stool. Porphyrins are chemicals that help make hemoglobin, a type of protein in your red blood cells. Hemoglobin carries oxygen from your lungs to the rest of your body.
Porphyrin | C20H14N4 | CID 66868 - PubChem
网页Porphyrin is a group of organic heterocyclic compounds that are comprised of four modified pyrrole subunits connected via methine bridges and form an aromatic macrocyclic structure, which has one or more side chains attached. Many porphyrins are naturally occurring pigments.
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