According to Khan et al. [Khan, A. U., Kovacic, D., Kolbanovskiy, A., Desai, M., Frenkel, K. & Geacintov, N. E. (2000) Proc. Natl. Acad. Sci. USA 97, 2984–2989], peroxynitrite (ONOO2) decomposes after protonation to singlet oxygen (DgO2) and singlet oxonitrate (nitroxyl, 1NO2) in high yield. They claimed to have observed nitrosyl hemoglobin from the reaction of NO2 with methemoglobin; however, ...

The production of two reactive oxygen species through UV photosensitization of polyhydroxylated fullerene (fullerol) is shown to enhance viral inactivation rates. The production of both singlet oxygen and superoxide by fullerol in the presence of UV light is confirmed via two unique methods: electron paramagnetic resonance and reduction of nitro blue tetrazolium. These findings build on previou...

Less than 5% of the total pool of free amino acids in plants under stress-free conditions is provided by proline. In many plants under various forms of stress, the concentration increases up to 80% of the amino acid pool. This observation raises the question about the molecular mechanisms, making a high proline concentration favourable under stress conditions. Therefore, the literature about th...

Treatment of Chinese hamster ovary and mouse hybridoma cells with Mega-H brand silica hydride, a marketed antioxidant, after photosensitization with singlet oxygen and hydroxyl/superoxide reactive oxygen species through the use of rose bengal diacetate and malachite green resulted in an effective method of reducing free radical activity by more than 96% against singlet oxygen species and more t...

Research at APL has been directed at understanding energy transfer events taking place after laser excitation of photosensitive compounds in condensed media. In particular, optical means have been developed for the detection of electronically excited molecular oxygen (singlet oxygen) resulting from a favored energy transfer from the sensitizer triplet state. Oxygen excited in this manner is tho...

Metal-to-ligand charge transfer photolysis of the ruthenium(II) pyrazine complex Ru(NH3)5pz2+ (I) in pH 7.4 oxygenated phosphate buffer solution generates the Ru(III) analog Ru(NH3)5pz3+ plus the reactive oxygen species singlet oxygen and superoxide. Based on the very short MLCT lifetime (re-measured as approximately 250 ps in D2O) of I* and the quantum yield for singlet oxygen formation (0.01 ...

N o r i o M i y o s h i a n d G i i t i T o m i t a Institute o f Biophysics , Faculty o f Agriculture, K y u s h u University, F u k u o k a 812, Japan Z. Naturforsch. 34b , 339-343 (1979); received October 4, 1978 Singlet Oxygen , Sodium Azide, Diphenylisobenzofuran, Reversed Micelles The ox idat ion reaction of singlet oxygen with 1,3-diphenylisobenzofuran was investigated in cyclohexanic re...