in this study, 5,10,15,20-tetrakis(4-nitrophenyl)porphyrin (tnpp) and its zinc porphyrin complex (zntnpp) were synthesized in situ using the microwave method and identified by uv-vis, ft-ir and 1h nmr. the photostability and photodynamic antimicrobial activity (pact) of these compounds were investigated on pseudomonas aeruginosa and bacillus subtilis under visible light irradiation. mic, mbc an...

The in vitro photodynamic inactivation of a wide variety of tumor cells was studied with various dyes used as sensitizcrs. The capacity of dyes to act as photosensitizers in this system parallels their capacity to sensitize the photoinactivation of many other substrates and correlates with their capacity to undergo photoreduction. Some dyes are able to inactivate tumor cells in the abscnce of l...

We investigated the photophysiological responses of three ecotypes of the picophytoplankter Ostreococcus and a larger prasinophyte Pyramimonas obovata to a sudden increase in light irradiance. The deepwater Ostreococcus sp. RCC809 showed very high susceptibility to primary photoinactivation, likely a consequence of high oxidative stress, which may relate to the recently noted plastid terminal o...

Photodestruction of Propionibacterium acnes was investigated by broad-band near-ultraviolet light. The inactivation of the bacteria was found to be oxygen dependent, and without O2 practically no photoinactivation occurred. D2O caused an increased inactivation (D10 = 5 kJ/m2 in D2O as compared to D10 = 11 kJ/m2 in normal water). Decreased temperature during illumination increased the ability to...