The influence of solar radiation on springtime rates of photochemical and biological consumption of dimethylsulfide (DMS) in surface waters from the western Atlantic Ocean was examined by exposing 0.2 mm filtered and unfiltered surface seawater to natural sunlight at five depths in the upper 30m. Parallel deck incubations of 0.2 mm filtered seawater under various long-pass optical filters were ...

In previous reports on isotopic fractionation in the ultraviolet photolysis of nitrous oxide (N2O) only enrichments of heavy isotopes in the remaining N2O fraction have been found. However, most direct photolysis experiments have been performed at wavelengths far from the absorption maximum at 182 nm. Here we present high-precision measurements of the 15N and 18O fractionation constants (ε) in ...

Background: Pharmaceuticals have arisen as emerging environmental pollutants due to their potential impact on humans, animals and microorganisms even at low concentrations. Conventional wastewater treatment plants are known to be ineffective for removal of many pharmaceuticals present in wastewater. Advanced oxidation processes are one of the most promising treatment technologies for degradatio...

This discussion paper is/has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP if available. Abstract Snow photochemical processes drive production of chemical trace gases, including nitrogen oxides (NO and NO 2), and HO x radicals in snowpacks which are then released to the lower atmosphere. Coupled atmosphere–snow m...

Absolute absorption cross-section and photolysis rate of I2 A. Saiz-Lopez, R. W. Saunders, D. M. Joseph, S. H. Ashworth, and J. M. C. Plane School of Environmental Sciences, University of East Anglia, Norwich, UK School of Chemical Sciences and Pharmacy, University of East Anglia, Norwich, UK Received: 23 February 2004 – Accepted: 8 April 2004 – Published: 5 May 2004 Correspondence to: J. M. C....

The hybrid semiconducter-macrocycle catalyst TiO2-cobalt phthalocyanine promotes the solar photolysis of aqueous bromoform under anaerobic conditions. The major decomposition products are dibromoethane and HBr. Bromomethane and methane were produced only after prolonged photolysis (30 hr). Acetone, derived from added 2-propanol, was the only observed oxidation product. Preliminary experiments s...

Zwitterions and polyoxometalates (POMs) are two kinds of functional moieties with very different properties for applications in different fields. We have developed an effective strategy to successfully immobilize these two different moieties into the frameworks of porous hybrid materials, in which the POM units act as templates and photoactive moieties. These hybrid materials demonstrate remark...

The chemistry of radicals adsorbed on zeolites is remarkable in that the products of radical-radical reactions, which are nonselective in solution, can be made selective and can be controlled by supramolecular effects and magnetic isotope effects. The photolysis of ketones adsorbed on zeolites can be manipulated so that either primary or secondary radicals produced by photolysis can be directed...

Estimates of caged-release based on photolysis of caged-fluorescein In order to provide estimates on the concentration of PtdIns(4,5)P2 or Ins(1,4,5)P3 released upon photolysis, we quantified the apparent efficacy of caged fluorescein photolysis in the first 40-50 μm of the pollen tube; this probe becomes fluorescent upon photorelease and the light emitted from loaded cells can be compared to k...

A substituted anthraquinone (AQ), previously shown to photochemically generate benzaldehyde in methanol solution, was attached to a commercially available resin via an 11 carbon tether and an amide bond. Photolysis of the polymer-bound AQ with visible or 350 nm UV light resulted in the formation of benzaldehyde in yields of 50-55% as determined by HPLC. The phenolic positions in the polymer wer...