• Synthesis of supramolecular fullerene-porphyrin-Cu(phen)2-ferrocene architectures. (rsc.org)
  • The task was to test whether lead, mercury, copper, zinc and benzene in environmentally relevant concentrations influence porphyrin synthesis of cells. (who.int)
  • The synthesis and characterization of a novel fully functionalized PR polymer using zinc porphyrin as a photosensitizer are reported. (psu.edu)
  • In this investigation attention has been concentrated on the biosynthetic pathway of porphyrins in both in vitro and in vivo experiments. (cdc.gov)
  • New compounds based on the association of polyoxometalates and cationic porphyrins or metalloporphyrins were prepared with the aim of obtaining new bi-functional catalysts. (ua.pt)
  • In water, cyclodextrin derivatives can prevent self-aggregation of sensitizers, which decreases the total quantum yields for photoinduced energy/electron transfer by fast self-quenching of singlet excited states, and anionic water-soluble zinc tetraphenyl porphyrin-pendant polymers (poly-ZnP) show self-aggregation and self-quenching of the singlet excited state of the zinc tetraphenyl porphyrin moiety. (elsevierpure.com)
  • With the addition of 2,3,6-tri-O-methyl-βcyclodextrin (TMBCD) to an aqueous solution of poly-ZnP, cyclodextrin inclusion induces isolation of the zinc tetraphenyl porphyrin moiety, which extends extensively the lifetime of the singlet excited state. (elsevierpure.com)
  • He and his research students use zinc oxide nanoparticles, nanorods and nanotubes as the photoanode in combination with a range of zinc porphyrins to better understand the interactions of dye and photoanode in dye-sensitized solar cells (DSSCs). (hmc.edu)
  • Iron oxide nanoparticles functionalized with novel hydrophobic and hydrophilic porphyrins as potential agents for photodynamic therapy. (docksci.com)
  • Please cite this article as: O. Penon, M.J. Marín, D.B. Amabilino, D.A. Russell, L. Pérez-García, Iron oxide nanoparticles functionalized with novel hydrophobic and hydrophilic porphyrins as potential agents for photodynamic therapy, Journal of Colloid and Interface Science (2015), doi: http://dx.doi.org/10.1016/j.jcis. (docksci.com)
  • Abstract The preparation of novel porphyrin derivatives and their immobilization onto iron oxide nanoparticles to build up suitable nanotools for potential use in photodynamic therapy (PDT) has been explored. (docksci.com)
  • To achieve this purpose, a zinc porphyrin derivative, ZnPR-COOH, has been synthesized, characterized at the molecular level and immobilized onto previously synthesized iron oxide nanoparticles covered with oleylamine. (docksci.com)
  • In natural photosynthetic systems, the primary electron transfer step occurs from a porphyrin-base complex. (psu.edu)
  • In 1974 ZPP was identified as a major non-heme porphyrin formed in red cells as the result of lead poisoning or iron deficiency. (wikipedia.org)
  • Acute intermittent porphyria (AIP) is one of the porphyrias, a group of hereditary diseases that involve defects in heme metabolism and result in excessive secretion of porphyrins and porphyrin precursors. (medscape.com)
  • Porphyrins and heme components are extracted from whole blood into a 4:1 mixture of ethyl acetate-acetic acid. (cdc.gov)
  • Our results showed high insecticidal activity of porphyrin compounds. (biomedcentral.com)
  • Porphyrin and its derivatives are well-known model compounds for photosynthetic processes that involve charge separation. (psu.edu)
  • Since the publication of Monograph 86, production of indium compounds has increased but appears limited by the low rate of refining indium as a byproduct of zinc and lead-zinc smelting (Hageluken 2006). (who.int)
  • Lead poisoning and hereditary tyrosinemia type I can cause neuropathies similar to those of acute intermittent porphyria (AIP), as well as elevated porphyrins and aminolevulinic acid (ALA). Conditions with similar presentations to AIP but without elevated porphobilinogen (PBG) excretions include Guillain-Barré syndrome and seizures. (arupconsult.com)
  • Initial testing includes porphobilinogen (PBG) measurement, urine porphyrin fractionation, and erythrocyte protoporphyrin measurements. (arupconsult.com)
  • Aim of the investigation was to prepare an environmental epidemiological test to detect the effects of pollutants by a pattern of porphyrin excretion in the urine. (who.int)
  • Demonstration of elevated porphyrins in plasma (particularly for congenital erythropoietic porphyria [CEP]), urine, and stool is very useful for diagnosis of the porphyrias. (medscape.com)
  • Qualitative urine examination can identify urine porphyrins. (medscape.com)
  • However, normal urine contains porphyrins, making comparison with a control sample essential. (medscape.com)
  • Quantitative urine porphyrin levels can be useful, but prior qualitative testing is desirable. (medscape.com)
  • Impaired function of PBGD leads to the accumulation of the porphyrin precursors porphobilinogen and amino-levulinic acid (ALA). The predominant clinical problem appears to be neurologic damage that leads to peripheral and autonomic neuropathies and psychiatric manifestations. (medscape.com)
  • On average, out of 100 patients with the genetic defect, perhaps 10-20 secrete excess porphyrin precursors and only 1-2 have symptoms. (medscape.com)
  • The exact mechanism by which the porphyrin precursors lead to these symptoms is unknown. (medscape.com)
  • The bromophenyl-substituted porphyrin building block forms only a small number of crystalline heteromolecular materials with other components, and occurrence of the uniquely structured porous porphyrin networks is not as dominant as in the analogous chlorophenyl derivatives. (tau.ac.il)
  • In this review we summarize the current state of the art in detailing the three main categories of quadruplex-binding macrocycles described so far (telomestatin-like polyheteroarenes, porphyrins and derivatives, polyammonium cyclophanes), and in addressing both synthetic issues and biological aspects. (hindawi.com)
  • The ZnPydiMeOPP porphyrin together with ZnTa2O6 and ZnV2O6 oxide materials, obtained by both hydrothermal and co-precipitation methods, were further used for anticorrosive coatings on steel in single and sandwich type PLD depositions. (growkudos.com)
  • This can be explained by the decrease of the pores of pseudo-binary oxide layers due to the porphyrin incorporation. (growkudos.com)
  • His research centers on dye-sensitized solar cells utilizing porphyrin dyes on nanostructured zinc oxide. (hmc.edu)
  • The electronic structures of the porphyrin macrocyclic core are strongly coupled with olefinic side chains so that the absorption spectrum exhibits broad and red-shifted Soret and Q-bands. (elsevierpure.com)
  • Stimulated by the pioneering studies on the cationic porphyrin TMPyP4 and the natural product telomestatin, follow-up studies have developed, rapidly leading to a large diversity of macrocyclic structures with remarkable-quadruplex binding properties and biological activities. (hindawi.com)
  • Tandem mass-spectrometry analyses provided structural information for two new porphyrin structures. (biomedcentral.com)
  • Thermal analysis revealed the relative strength of binding of the ligand and solvate species to the porphyrin lattice. (tau.ac.il)
  • Oral photoprotection can be achieved with free radical scavengers, thereby reducing free radicals, singlet oxygen formation, and the photosensitizing effect of porphyrins. (medscape.com)
  • In order to probe the capability of the photosensitizer for PDT, the singlet oxygen production of both ZnPR-IONP and the free ligand ZnPR-COOH have been quantified by measuring the decay in absorption of the anthracene derivative 9,10-anthracenedipropionic acid (ADPA), showing an important increase on singlet oxygen production when the porphyrin is incorporated onto the IONP (ZnPR-IONP). (docksci.com)
  • Although levels of porphobilinogen and ALA are always elevated during acute attacks, how this leads to the symptomatic disease is still unclear because most patients with the genetic defect have excessive porphyrin secretion but no symptoms. (medscape.com)
  • The main result is the decrease in the concentrations of porphyrins caused by copper. (who.int)
  • Heavy emphasis has been put on the interdependence of cadmium with some other metals as zinc, copper, and lead. (cdc.gov)
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  • Secondary testing includes porphyrin analysis of stool and plasma. (arupconsult.com)
  • Stool porphyrin levels that are combined with other laboratory values and clinic correlation help guide the diagnosis. (medscape.com)
  • The mechanism of corrosion protection might be explained by the physical/mechanical barrier effect, because corroborating the electrochemical results with the microscopy investigations resulted that Zn-porphyrins layers, no matter of their position on top or below, act as a barrier against the contact with acid ions thus protecting the steel surfaces. (growkudos.com)
  • The molecular structure of the porphyrin compound is characterized by a nearly perfect planarity of the metalloporphyrin core due to effective Zn⋯Br intermolecular interactions in the crystalline lattice. (tau.ac.il)
  • The structure, conjugation, and planarity of the porphyrin compound were carefully tuned by molecular design, which resulted in a low-energy photoluminescence peak at 872 nm. (chalmers.se)
  • Because of the complexity of the crude extract, we used fractionation-guided bioassays to investigate if the low toxicity was related to the relative abundance of the active molecule, leading to the isolation of porphyrins as active molecules. (biomedcentral.com)
  • The development and application of a deep near-infrared (NIR) emitting star-shaped diketopyrrolopyrrole-Zn-porphyrin compound, ZnP(TDPP)4, is reported. (chalmers.se)
  • The title compound, [Zn(C 44 H 28 N 4 (C 7 H 7 NO)], is a squarepyramidal five-coordinate zinc-porphyrin complex with γacetylpyridine as the apical ligand. (tau.ac.il)
  • abstract = "The title compound, [Zn(C44H28N4(C 7H7NO)], is a squarepyramidal five-coordinate zinc-porphyrin complex with γacetylpyridine as the apical ligand. (tau.ac.il)
  • In its +6 oxidation state, this aromatic, 12-porphyrin nanoring produces a ring current that induces magnetic fields both opposing (blue) and aligning with (red) an external field. (acs.org)
  • The oxidation of cis-cyclooetene, geraniol and (+)-3-carene by hydrogen peroxide catalysedby the polyoxometalate/Mn(III)porphyrin associations and co-catalysed by ammonium acetate was examined. (ua.pt)
  • Subsequently, the fullerene module 10 was incorporated by axial pyridyl coordination to the zinc porphyrin , affording 11-14 . (rsc.org)
  • Functionalized porphyrin at β-positions with carboxylic acid groups was prepared to investigate the photovoltaic function as dye-sensitized nanocrystalline-TiO 2 solar cells. (elsevierpure.com)
  • Under the electric field produced by the STM tip, the relatively weakly bound Au surface atoms along the discommensuration lines become mobile due to the strong bond to 4-ATP, while the tendency of the porphyrins towards self-assembly result in a collective motion of gold clusters. (unicampus.it)
  • University of Oxford researchers constructed a 16 nm wide molecular wheel , which contains 12 porphyrins and 162 π electrons. (acs.org)
  • In the ring, zinc porphyrins are linked by alkynes and held in place by molecular spokes. (acs.org)
  • Zinc protoporphyrin levels can be elevated as the result of a number of conditions, for instance: lead poisoning iron deficiency sickle cell anemia sideroblastic anemia anemia of chronic disease vanadium exposure erythropoietic protoporphyria Diverse types of cancer The virtue of elevated ZPP testing as a screen is that all of these conditions can be considered worth discovering. (wikipedia.org)
  • Four-, five- and six-coordination of the central zinc ion was observed, but there is no apparent correlation between the coordination number and the crystal packing type. (tau.ac.il)
  • Zinc protoporphyrin (ZPP) refers to coordination complexes of zinc and protoporphyrin IX. (wikipedia.org)
  • Four supramolecular fullerene - porphyrin -Cu(phen) 2 - ferrocene architectures were accessed by a twofold coordination strategy. (rsc.org)
  • The structural patterns of Zn(II)-tetra(4-bromophenyl)porphyrin and several of its newly prepared complexes and clathrates in the solid phase were determined by X-ray crystallography. (tau.ac.il)
  • Porphyrin complexes of zinc have been known since the 1930s. (wikipedia.org)
  • Planar zinc(II) complexes are unknown. (wikipedia.org)
  • The active fraction, containing a mixture of porphyrins, induced up to 100% larval mortality (LD 50 = 37.7 μg.cm −2 ). (biomedcentral.com)
  • Data on the availability of porphyrins in 67 other crude extracts of ant ectosymbionts were also obtained with ion-monitoring experiments. (biomedcentral.com)
  • Measurement of zinc protoporphyrin in red cells has been used for screening for lead poisoning. (wikipedia.org)
  • Nanofingers of gold covered by porphyrins are prepared by a combination I of atomic manipulation and surface self-organization. (unicampus.it)
  • A submonolayer of zinc(II) 5,10,15,20-tetrakis(4-tert-butylphenyl)-porphyrin (ZnTBPP) axially ligated to a self-assembled monolayer of 4-aminothiophenol (4-ATP) on Au(111) is prepared and studied using a combination of ultrahigh vacuum techniques. (unicampus.it)
  • In the presence of TMBCD, the quantum yield for photoinduced triplet-triplet (T-T) energy transfer (Φ en ) from photoexcited poly-ZnP to O 2 was enhanced remarkably from 0.11 (without TMBCD) to 0.57 (with TMBCD) in air-saturated water. (elsevierpure.com)
  • On the other hand, the porphyrin derivative PR-TRIS3OH, incorporating several polar groups (TRIS), was synthesized and immobilized with the intention of obtaining water soluble nanosystems (PR-TRIS-IONP). (docksci.com)
  • The model used was the permanent epithelial larynx carcinoma cell line HEp-2, which was stimulated to synthesize porphyrins by adding δ-amino-levulinic acid (δ-ALA) in excess. (who.int)
  • However, levels of porphyrins widely vary, and, in most cases, exact values for each disorder have not been established. (medscape.com)
  • The early literature on quantifying zinc-PP levels may be unreliable. (wikipedia.org)
  • Porphyrin levels can be reduced by direct methods or with medications that bind porphyrins. (medscape.com)
  • These include monoclinic 'herringbone' packing modes without any apparent involvement of the halogen atoms in specific interactions, chained interporphyrin arrangements exhibiting C-Br⋯π close approach, and porous layered networks of the porphyrin species revealing direct Br⋯Br contacts. (tau.ac.il)
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  • These systematically optimized host-guest LECs featured a peak electroluminescence at 900 nm, which was delivered at a significant radiance of 36 μW/cm2 and at a low drive voltage of 3.8 V. It is notable that this is the most redshifted NIR emission attained from an LEC device to date, and as such, this work introduces Zn porphyrins as a sustainable and tunable option for emerging emissive NIR applications. (chalmers.se)