How To Use Porphyrin In A Sentence
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X-ray absorption and photoemission spectroscopy of zinc protoporphyrin adsorbed on rutile TiO2 (110) prepared by in situ electrospray deposition
Next Big Future
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In this work a systematic study of the photophysical properties of four cationic porphyrins in liposomes is performed and results are compared with those found in homogeneous media.
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The active site or prosthetic group of all the cytochromes is an iron containing porphyrin, or heme.
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Delayed photohemolysis of bovine red blood cells were investigated in this laboratory for sodium hypericin (HY-Na) and benzoporphyrin derivative monoacid ring A.
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Some recent reviews are listed here on general properties of porphyrins as sensitizers and on their preclinical and clinical tests.
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The lifetimes of the excited singlet states S1 of the organic biological macromolecules haematoporphyrin and lactoflavin were measured with streak camera.
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The study focuses on a homologous series of meso-substituted A4-porphyrins bearing aryl groups with long alkoxy chains.
Innovations-report
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These observations suggest that the generation of 102 by lipophilic porphyrins occurs within the bilayer, which is also the site of damage.
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The majority of photosensitizers are derivatives of hematoporphyrin, a synthetic porphyrin synthesized from heme.
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It seems likely that William was suffering from porphyria, which is an upset in metabolism resulting in inadequate utilization of chemicals known as porphyrins.
The Pawprints of History
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Irradiation of aminolevulinic acid/protoporphyrin IX-sensitized cells with 10 J cm - 2 of 514 nm light led to pronounced changes in angularly resolved light scattering consistent with mitochondrial swelling.
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Zinc protoporphyrin regulates cyclin D1 expression independent of heme oxygenase inhibition.
Recent Neonatal Research Publications
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In conducting these experiments, we discovered that the non-nitric oxide containing substance, protoporphyrin
Louis J. Ignarro - Autobiography
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This genetic disorder leads to an accumulation of protoporphyrin IX in the skin and an increased risk of incapacitating phototoxic reactions manifesting as pain and severe ulceration of the skin.
THE MEDICAL NEWS
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The resulting porphyrin nanotubes have ‘interesting electronic and optical properties such as an intense resonance light scattering ability and photocatalytic activity.’
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Changes in apoprotein and porphyrin fluorescence suggest two classes of bound porphyrins.
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This important result, that the vertical displacement of the porphyrins is increased with elongation of the side chains, was observed earlier with the series of protoporphyrins.
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Even if I add that Fischer has demonstrated the occurrence of haemin in yeast, all this is overshadowed by the fact that, chemically speaking, the pigment of green plants, i.e. chlorophyll, is closely related with the red blood pigment, and even derives, as Fischer has shown, from exactly the same parent substance, as regards the porphyrins.
Nobel Prize in Chemistry 1930 - Presentation Speech
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No inactivation was observed when the medium was not aerated, and light alone or porphyrin alone was ineffective.
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Coproporphyrinogen III is transported to the interior of the mitochondrion, where 2 propionate residues are decarboxylated, yielding vinyl substituents on the 2 pyrrole rings.
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Meng et al. have investigated meso-substituted porphyrins, synthesized by sulfonation or methylation of the phenyl or pyridyl groups, respectively.
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The fluorescence intensity of porphyrin also relates to the substituent positions on the phenyl groups.
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The researchers used a nanoparticulate semiconductor electrode coated with a light-sensitive porphyrin or chlorophyll dye.
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A series of azo hydroxyporphyrin - oxadiazole compounds were synthesized and characterized by 1 HNMR, FAB - MS, IR and UV - Vis spectra.
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They recently studied the biodistribution of tetra (m-hydroxyphenyl) chlorin and benzoporphyrin derivative monoacid ring A in the hamster model.
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The photosensitizer used in this study was benzoporphyrin derivative monoacid ring ‘a’ as supplied in a lipid formulated preparation under the generic name verteporfin.
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The heme component is a porphyrin in which the metal ion that is coordinated is iron in the ferrous state, that is, Fe+2.
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Heme, a complex heterocyclic compound, is an organic molecule derived from porphyrin with an iron atom at the centre.
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Secondary indicators of efficacy included restoration of red cell ALA-D activity, an enzyme necessary for heme synthesis, and a reduction in urinary ALA and coproporphyrin.
Succimer
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It was discovered that the haemin molecule can be converted by certain chemical procedures into iron-free substances, called porphyrins, and that the porphyrins can be broken down, by other procedures, into pyrrole derivatives, i.e. into compounds containing four carbon atoms and one nitrogen atom in a closed ring.
Nobel Prize in Chemistry 1930 - Presentation Speech
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The free-base form of such porphyrins contains two pyrrole nitrogens.
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Particular attention was given to the family of chlorins that differ from porphyrins only by saturation of a peripheral double bond of the macrocycle.
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We also show the effect of temperature and physical phase of the lipid on the vertical displacement of the porphyrins in the bilayer.
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The active site or prosthetic group of all the cytochromes is an iron containing porphyrin, or heme.
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The heme component is a porphyrin in which the metal ion that is coordinated is iron in the ferrous state, that is, Fe+2.
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It should also be noted that the doming deformation in the NSD context does not involve the iron, but only the 24 atoms of the porphyrin ring.
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This property also leads to the intense luminescence and electron transfer capability of porphyrins and many metalloporphyins.
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Most perching birds lay eggs speckled with reddish protoporphyrin spots toward the egg's blunt end.
Tech and Science
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Poor merriehaskell should be able to sympathize, since porphyrin and I were calling her "murr" and it ought to have been "mare.
Barnstorming on an Invisible Segway
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O S magnesium-protoporphyrin IX 13-monomethyl ester
Recently Uploaded Slideshows
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An iron porphyrin, called heme, is the portion of hemoglobin that carries oxygen from the lungs to our body's cells.
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In haemoglobin the iron lies within a flat circular molecule called a porphyrin.
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An iron porphyrin, called heme, is the portion of hemoglobin that carries oxygen from the lungs to our body's cells.
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These differences might be related to the shape of the species in water, namely, the globular structure of meta-substituted porphyrins and the dimeric form of the zinc porphyrins.
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The phototoxic activity of this porphyrin is mainly mediated by the impairment of the enzymic and transport functions of both the outer and cytoplasmic membranes.
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To make their molecular molds, the researchers begin by attaching wedge-shaped molecules called ‘dendrons’ to a porphyrin core to create a dendrimer.
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The breakdown of porphyrin yields bilirubin, a product that is non-polar and therefore, insoluble.
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This turnover releases significant amounts of the iron-free portion of heme, porphyrin, which is subsequently degraded.
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The UV - Vis spectra of amphiphilic porphyrins in aqueous and salt solution were analyzed at neutral condition.
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The NSD method has been used extensively to describe and analyze the out-of-plane distortions of porphyrins in heme proteins.
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The majority of photosensitizers are derivatives of hematoporphyrin, a synthetic porphyrin synthesized from heme.
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Magnesium-protoporphyrin IX 1.14.13.81 monomethyl ester (oxidative) cyclase 1 Nomenclature EC number 1.14.13.81 Systematic name magnesium-protoporphyrin-IX 13-monomethyl ester, NADPH: oxygen oxido - reductase (hydroxylating) Recommended name magnesium-protoporphyrin IX monomethyl ester (oxidative) cyclase Synonyms Mg-protoporphyrin IX monomethyl ester
Recently Uploaded Slideshows
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It was discovered that the haemin molecule can be converted by certain chemical procedures into iron-free substances, called porphyrins, and that the porphyrins can be broken down, by other procedures, into pyrrole derivatives, i.e. into compounds containing four carbon atoms and one nitrogen atom in a closed ring.
Nobel Prize in Chemistry 1930 - Presentation Speech
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In 1911, he reported on the effect of hematoporphyrin and light on a paramecium and red blood cells and described skin reactions in mice exposed to light after hematoporphyrin administration.
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The redshift in the absorption spectrum reflects electronic interactions between the porphyrin and the melanins.
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However, the mechanism of porphyrin photodegradation can be complex and differs in solution and in biological media.
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Thus some shallow water marine annelid worms contain considerable quantities of porphyrins in their tissues, but are tubicolous or burrowing in habit.
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The majority of iron in humans is located in the porphyrin ring of heme that is incorporated into proteins and enzymes such as myoglobin, hemoglobin, cytochromes, catalases, and peroxidases.
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Yesterday is western Valentine's Day, a good many young lovers selects in this special day to dedicate haematoporphyrin with the no consideration this significative mode expression love.
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Exposure to lead also can be evaluated by measuring erythrocyte protoporphyrin (EP) in blood samples.
Public Health Statement for Lead
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Why mammals have a common blood structure (Types A,B,O also in chimps) based on cells, in contrast to circulating proteins (cf. hemocyanin, a copper-based porphyrin oxygen-carrier found in e.g. lobsters).
The Great Debate - The Panda's Thumb
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Very few porphyrins are known to form J-aggregates, the main requisite being the zwitterionic character with the protonation of the pyrrole nitrogen in the macrocycle.
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IR absorption bans of three new kinds of tail - porphyrin quaternary ammonium salts were determined and analyzed.
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This turnover releases significant amounts of the iron-free portion of heme, porphyrin, which is subsequently degraded.
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Visudyne-PDT (based on benzoporphyrin derivative monoacid ring A [BPD-MA]) was approved by the FDA in April 2000 for the treatment of a nonmalignant disease.
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The induction of DNA single-strand breaks(ssb)by exposure to hematoporphyrin photosensitizer(PSD-007)followed by photoirradiation was observed in mice leukemia cells(L7712)in vitro.
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A porphyrin is a macrocyclic (large cycle) molecule that is made up of four smaller pyrrolenine rings.
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Measurement of coproporphyrin and ALA-D provide clinical investigators with an indication of lead effects on heme biosynthetic pathways and reversal of these effects during chelation therapy.
Succimer
