Huisgen’s reaction of alkynes with Ozone (O 3 ), at its first step yielding carboxylic acids functional groups is, undoubtedly, an example of 1,3-dipolar cycloaddition reactions. Cycloadditions of 1,3-dipoles may occur by concerted mechanisms. The energy content in alkynes may be increased further by bending the normally linear triple bond, as in the small cycloalkynes. The strain energy in the...

Ozone (O3) has attracted much attention because of its key role in human health and disease, and its detection is of great importance for various biochemical studies as well as environmental evaluation. Here we develop a simple and practical spectroscopic off-on O3 probe based on resorufin and the specific reaction of but-3-enyl with O3. The probe shows an extremely low background spectroscopic...

This study was initiated to explore the effects of ozone (O3) exposure on potted wheat roots and soil microbial community function. Three treatments were performed: (1) Air with daily averaged O3 concentration of 4–10 ppb (control situation, CK), (2) Air plus 8 h averaged O3 concentration of 76.1 ppb (O3-1), and (3) Air plus 8 h averaged O3 concentration of 118.8 ppb (O3-2). In treatments with ...

Ground-level ozone (O3) is a harmful air pollutant causing reduced crop yield and quality, reduced forest growth and negative effects on human health in large parts of the world. O3 is generally seen as a regional scale air pollution problem, but O3 concentration ([O3]) variation on a smaller geographical scale can be considerable. Knowledge of the size of this local scale variation and the und...

To evaluate the effects of O3 on the net photosynthetic rate in flag leaves of rice (Oryza sativa L.) based on stomatal O3 flux and reactive oxygen species (ROS) scavenging enzyme activities, the Japanese rice cultivar Koshihikari was exposed to O3 for 1 month after heading in O3-exposure chambers. During the exposure period, rice plants were exposed to charcoal-filtered air or O3 at 60 or 100 ...

The impact of convection on tropospheric O3 and its precursors has been examined in a coupled chemistryclimate model. There are two ways that convection affects O3. First, convection affects O3 by vertical mixing of O3 itself. Convection lifts lower tropospheric air to regions where the O3 lifetime is longer, whilst mass-balance subsidence mixes O3-rich upper tropospheric (UT) air downwards to ...

Hydrogen peroxide exalts the reactivity of aqueous ozone by reasons that remain obscure. Should H2O2 enhance free radical production, as it is generally believed, a chain mechanism propagated by (.OH/.O2-) species would account for O3 decomposition rates in neat H2O, HR-O3, and in peroxone (O3 + H2O2) solutions, HPR-O3. We found, however, that: (1) the radical mechanism correctly predicts HR-O3...