Folate plays an important role in metabolism and its deficiency can lead to cardiovascular problems or carcinogenesis. Some studies show that narrow band UVB (NBUVB) causes folate deficiency by photolysis , while others have different opinions or even the contrary. With regard to paradoxes in this context, we decided to study the effect of NBUVB on folate levels in patients with dermatologic di...

The ultraviolet (λ=250–370 nm) photolysis and the OH-initiated oxidation of hexanal and trans-2-hexenal, which are relevant atmospheric processes, have been investigated at room temperature and as a function of temperature (T=263–353 K), respectively. This kinetic study as a function of temperature is reported here for the first time. 5 Absolute absorption cross sections (σ λ) were obtained usi...

The kinetics of release of soluble marker trapped in liposomes of gel phase phospholipid containing a photoisomerisable phospholipid analogue have been investigated. Marker release is triggered by UV laser flash photolysis at 355 nm. A markedly temperature-dependent release rate is seen, and above 25 degrees C millisecond release kinetics can be achieved. These results suggest that such liposom...

Won JH, Cottrell WJ, Foster TH, Yule DI. Ca release dynamics in parotid and pancreatic exocrine acinar cells evoked by spatially limited flash photolysis. Am J Physiol Gastrointest Liver Physiol 293: G1166–G1177, 2007. First published September 27, 2007; doi:10.1152/ajpgi.00352.2007.—Intracellular calcium concentration ([Ca ]i) signals are central to the mechanisms underlying fluid and protein ...

UV-visible absorption cross-sections are reported for CF3C(O)CH3, CF3C(O)CH2CH3, and CH3CH2C(O)CH(CH3)2. The photolysis rate constants of CF3C(O)CH3, CF3C(O)CH2CH3, and CF3CF2C(O)CF(CF3)2 were measured from smog-chamber experiments carried out in a 400 L Teflon-bag reactor under sunlight irradiation. Actinic radiation profiles from the "Tropospheric Ultraviolet and Visible Radiation Model" were...

The discovery of sulfur mass-independent fractionation (S-MIF) in ancient sedimentary rocks [1] has created the opportunity for quantitative constraints on the composition of the early atmosphere. Laboratory experiments have shown that S-MIF occurs during SO2 photodissociation at a variety of UV wavelengths [2, 3]. The source of the S-MIF in experiments at wavelengths ~ 200 nm is self-shielding...

Abstract Photolysis has enabled the occurrence of numerous discoveries in chemistry, drug discovery and biology. However, there is a dearth efficient long wavelength light mediated photolysis. Here, we report general single photon method for wide array photolytic molecules via triplet-triplet annihilation This versatile “LEGO”-like. The partners (the photosensitizers molecules) can be energetic...