A fullerene molecular tip was used to detect electron tunneling from a single porphyrin molecule. Electron tunneling was found to occur locally from an electron-donating moiety of the porphyrin to the fullerene through charge-transfer interaction between them. In addition, electron tunneling within the single fullerene-porphyrin pair exhibited rectifying behavior in which electrons can be drive...

response varied significantly with the dose of porphyrin given: tumors of all 27 mice (100%) who received 0.05 mg of "hemato porphyrin" or its copper complex showed grossly complete re gression and did not recur during the following 84-86-day study period, while such regression was seen in only 5 of 126 mice (4%) treated by injection with the other dose levels of porphyrin or with vehicle alone...

Background: This study was carried out to evaluate the protective effects of a cell permeable antioxidant, Manganese (III) meso-tetrakis (N-ethylpyridinium-2-yl) porphyrin chloride (MnTE), alone or in combination with different concentration of Catalase on motility of frozenthawed goat semen. Materials and Methods: Fresh semen ejaculates were collected with artificial vagina from 3 goats, mixed...

In the present study, porphyrin-based metal–organic framework (Co/PMOF) was synthesized and characterized by different spectra analyses. The photoluminescence properties of porphyrin Co/PMOF revealed that quenched compared to porphyrin, indicating lifetime photo-generated charge carriers in is longer than porphyrin. prepared applied as an efficient photocatalyst for CO2 photoconversion formate ...

The search for new stationary phases has been one of the predominant concerns in high performance liquid chromatography (HPLC) in order to achieve better resolutions, longer column lives, and reduce the time of analysis. A chromatographic packing for separation of underivatized amino acids (AAs) were prepared by dynamically coating 2-amino tetraphenyl prophyrin (atpp) on a C-18 reversed-pha...

Porphyrin-polyyne [3]- and [5]rotaxanes have been synthesized by condensing aldehyde-rotaxanes with pyrrole or dipyrromethane. The crystal structure of a [3]rotaxane shows that the macrocycles adopt compact conformations, holding the hexaynes near the porphyrin core, and that the phenanthroline units form intermolecular π-stacked dimers in the solid. Fluorescence spectra reveal singlet excited-...

On the basis of earlier results with furan and thiophene derivatives benzobicyclo[3.2.1]octadiene, photocatalytic oxygenation novel furo- thieno heterostilbenes water-soluble manganese(III) porphyrins offered suitable possibilities to study their reactivities reaction pathways depending on heteroatom catalyst charge. The experiments were carried out in two reactors types (batch microflow) inves...

The dorsomedial portion of the nucleus tractus solitarius (dmNTS) is the site of termination of baroreceptor and cardiorespiratory vagal afferents and plays a critical role in cardiovascular regulation. Angiotensin II (Ang II) is a powerful signaling molecule in dmNTS neurons and exerts some of its biological effects by modulating Ca(2+) currents via reactive oxygen species (ROS) derived from r...

The dorsomedial portion of the nucleus tractus solitarius (dmNTS) is the site of termination of baroreceptor and cardiorespiratory vagal afferents and plays a critical role in cardiovascular regulation. Angiotensin II (Ang II) is a powerful signaling molecule in dmNTS neurons and exerts some of its biological effects by modulating Ca currents via reactive oxygen species (ROS) derived from reduc...

Reactive oxygen species contribute to ischemic brain injury. This study examined whether the porphyrin catalytic antioxidant manganese (III) meso-tetrakis (N-ethylpyridinium-2-yl)porphyrin (MnTE-2-PyP(5+)) reduces oxidative stress and improves outcome from experimental cerebral ischemia. Rats that were subjected to 90 min focal ischemia and 7 d recovery were given MnTE-2-PyP(5+) (or vehicle) in...