Supramolecular chemistry has evolved from molecular chemistry over the last half century as the science of “chemistry beyond the molecule.” Supramolecular organic chemistry can be described in a number of ways, such as: (1) chemistry of molecular complexes; (2) chemistry of noncovalent bonds; (3) chemistry of the intermolecular bond; and (4) chemistry of molecular recognition. These are appeali...

Plectonema boryanum UTEX 485 cells were grown at 29 degrees C and 150 mumol m-2 s-1 photosynthetically active radiation (PAR) and exposed to PAR combined with ultraviolet-A radiation (UV-A) at 15 degrees C. This induced a time-dependent inhibition of photosystem II (PSII) photochemistry measured as a decrease of the chlorophyll a fluorescence ratio, Fv/Fm, to 50% after 2 h of UV-A treatment com...

Biodegradation is competitive with photochemistry, especially in summer and at night. Formic acid the most impacted compound.

New particle formation (NPF) and subsequent growth are primary sources of atmospheric aerosol particles and cloud condensation nuclei. Previous studies have been conducted in relatively clean environments; investigation of NPF events over highly polluted megacities is still lacking. Here we show, based on a recent yearlong aircraft campaign conducted over Beijing, China, from April 2011 to June...

This paper presents three-dimensional prognostic O3 simulations with parameterized gas-phase photochemistry from the new NOGAPS-ALPHA middle atmosphere forecast model. We compare 5-day NOGAPS-ALPHA hindcasts of stratospheric O3 with satellite and DC-8 aircraft measurements for two cases during the SOLVE II campaign: (1) the cold, isolated vortex during 11–16 January 2003; and (2) the rapidly de...

Over 150 extrasolar planets are known to orbit sun-like stars. A growing number of them (9 to date) are transiting “hot Jupiters” whose physical characteristics can be measured. Atmospheres of two of these planets have already been detected. We summarize the atmosphere detections and useful upper limits, focusing on the MOST albedo upper limit and H exosphere detection for HD209458b as the most...

The photochemistry of small molecules on well-defined metal surfaces has been the subject of intense research for more than three decades.1 This field is of interest because it rests on the superposition of two influences. On one hand, new reaction channels can become possible by electronic excitation, which are usually not accessible by thermal activation. On the other hand, compared to molecu...

Evaluation of linear ozone photochemistry parametrizations in a stratosphere-troposphere data assimilation system A. J. Geer, W. A. Lahoz, D. R. Jackson, D. Cariolle, and J. P. McCormack Data Assimilation Research Centre (DARC), University of Reading, Reading, UK Now at European Centre for Medium-Range Weather Forecasts (ECMWF), Reading, UK Met Office, Exeter, UK Centre Européen de Recherche et...

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