AIMS To investigate the effect of extrinsic control parameters for ozone inactivation of E. coli in a bubble column. METHODS AND RESULTS Ozone inactivation of Escherichia coli ATCC 25922 in Tryptic Soya Broth was examined. The parameters studied included temperature (ambient, 20, 25 and 30 degrees C), exposure time (up to 30 min), gas flow rate (0.03, 0.06, 0.12, 0.25, 0.5 and 0.75 l min(-1))...

Although there has been a great deal of research on ozone, interest in exposure of native, herbaceous species is relatively recent and it is still not clear what role the pollutant has in their ecological fitness. The ozone exposure of a plant is usually expressed in terms of the concentration above the canopy or as a time-weighted index. However, to understand the physiological effects of ozon...

The effect of different ozone doses was assessed in terms of biogas production, anaerobic digestion (AD) kinetics and concentration of amino acids (AA) and long chain fatty acids (LCFA) in the waste activated sludge (WAS). Four different ozone (O3) doses were used: 0.043 gO3/gTSS, 0.063 gO3/gTSS, 0.080 gO3/gTSS and 0.100 gO3/gTSS. The lower doses resulted in biogas production increases and fast...

Ground-level ozone concentration is a key indicator of air quality. There may exist sudden changes in ozone concentration data over a long time horizon, which may be caused by the implementation of government regulations and policies, such as establishing exhaust emission limits for on-road vehicles. To monitor and assess the efficacy of these policies, we propose a methodology for detecting ch...

Ecosystems remove ozone from the troposphere through both stomatal and non-stomatal depositions. The portion of ozone taken up through stomata has an oxidative effect causing damage.We used amultiyear dataset to assess ozone deposition to a ponderosa pine plantation near Blodgett Forest, Georgetown, California. Environmental parameters, water and ozone concentrations and fluxes were measured co...

Recently, the surface ozone concentration in the Korean peninsula has been increasing more rapidly than in the past, and seasonal changes are appearing such as increases in the number of ozone alerts in springtime. We examined changes in the timing of annual maximum South Korean O3 levels by fitting a sine function to data from 54 air-quality monitoring sites over a 10-year period (2005-2014). ...

Future stratospheric ozone concentrations will be determined both by changes in the concentration of ozone depleting substances (ODSs) and by changes in stratospheric and tropospheric climate, including those caused by changes in anthropogenic greenhouse gases (GHGs). Since future economic development pathways and resultant emissions of GHGs are uncertain, anthropogenic climate change could be ...

To evaluate the impact of emission change in East Asia on the surface ozone concentration and crop yield loss especially for wheat and rice, we developed a one-way nested global–regional chemical transport model, and conducted 1–year calculations with emission inventories for 2000 and 2020. The model consisted of global and regional CTMs. The global CTM was based on the chemical atmospheric gen...

In this study the variations in the surface ozone concentration, the solar ultraviolet radiation and the meteorological parameters at the ground before, during and after the total solar eclipse of 29 March 2006 have been examined. This analysis is based on the measurements performed at four stations located in the greater Athens basin in Greece. The experimental data demonstrated that the solar...

This study aims to evaluate the cozone bactericidal activity in different suspension media (saline, broth and whole blood) at different exposure times. Methicillin-resistant Staphylococcus aureus, Enterococcus faecalis, ESBLpositive Escherichia coli, MDR Pseudomonas aeruginosa were suspended in different media. We used a bacterial concentration of 0.2 MF for all experiments, as this concentrati...