The threading behavior of a zinc analogue of a previously reported processive manganese porphyrin catalyst onto a series of polymers of different lengths is reported. It is demonstrated that the speed of the threading process is determined by the opening of the cavity of the toroidal porphyrin host, which can be tuned with the help of axial ligands that coordinate to the metal center in the por...

A chiral metal-organic framework film with optoelectronic properties based on functionalized porphyrin molecules is presented by Mariana Kozlowska, Lars Heinke et al. in their Research Article (e202217377). While the solution (red) are planar, as common porphyrin, cores twisted and upon assembly framework. The close packing crystalline order of result excellent photoconduction sensitivity to ci...

A water-soluble covalently linked C(60)-porphyrin compound-C(60)Por is reported to show enhanced DNA-cleaving activity. The highly enhanced DNA-cleaving activity is expected to be ascribed to the high water-solubility and affinity of C(60)Por to DNA, as well as to the accessibility to the charge-separated states C(60)˙(-)-Por˙(+) formed under radiation.

The Enterotest string test is an easy and non-invasive method for sampling duodenal fluid, which has been successfully used for the analysis of duodenal microflora, as well as biliary bile acid and lipid composition. The method was evaluated for determination of porphyrins in duodenal bile in normal subjects and subjects with porphyria, following cholecystokinin induced gall bladder contraction...

A detailed investigation was carried out of the effects of porphyrin composition on the activity and selectivity of iron(III) porphyrin catalysts used or the epoxidation of cyclooctene by hydrogen peroxide. Under conditions where the formation of -oxo-dimers can be avoided, the mechanism f cyclooctene epoxidation and hydrogen peroxide decomposition are identical for all of the porphyrin catalys...

Ghimire, Srijana. Ph.D., Purdue University, December 2014. Synthesis and DNABinding Studies with two Sterically-Friendly Porphyrin Frameworks. Major Professor: David R. McMillin. Peripheral substituents on cationic porphyrins play a significant role during binding with DNA hosts. Possible applications of these systems in photodynamic therapy as well as in anti-bacterial and anti-cancer therapie...

The histology and porphyrin content of the Harderian gland and the serum prolactin levels were examined in male B6C3Fl mice treated with neuroleptic butyrophenones (timiperone and haloperidol) and treated concurrently with timiperone and 2bromocr -ergocryptine (bromocriptine), a potent suppressor ofpro]actin. Light-microscopically, both tjmiperone and haloperidol increased the number of accreti...

In oxygenic phototrophs, chlorophylls, hemes, and bilins are synthesized by a common branched pathway. Given the phototoxic nature of tetrapyrroles, this pathway must be tightly regulated, and an important regulatory role is attributed to magnesium chelatase enzyme at the branching between the heme and chlorophyll pathway. Gun4 is a porphyrin-binding protein known to stimulate in vitro the magn...

complex reacted rapidly with 02-. in a catalytic manner. The rate constant for O,-* dismutation was determined by competition of the iron porphyrin with Nitro Blue Tetrazolium in a xanthine/xanthine oxidase system at pH 10.1 ; a value of 3 x ~O'M-' .s-' at 20°C was obtained. The iron porphyrin had no effect on xanthine oxidase activity. Under our reaction conditions, at least 14 molecules of Oz...

ers used in photodynamic therapy. Upon light irradiation, porphyrins produce singlet oxygen, which causes cytotoxic activity at specific subcellular sites, leading to cell death. The quantum yield of singlet oxygen depends on the porphyrin employed, being significantly lowered by dimerization or aggregation of the porphyrin. The aggregation of porphyrins also affects the transfer of electrons f...