Atmospheric radical

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  • I t is a great honour and joy for me to present this volume of Scripta Varia which contains the papers presented during the Study Week on “Chemical Events in the Atmosphere and their Impact on the Environment” held at the seat of the Academy from the 7th to the 11th of November, 1983. The discussions which followed each presentation are included in the volume. These proceedings are of great interest; they touch on problems which may seem diverse for a non-knowledgeable person, or insignificant to those who flee the reality of our present world.

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  • Treatments that take into account the physics of can- cer cells and tumours could, however, offer radically new approaches, especially when combined with nano- technology. As far as the NCI initiative is concerned, it is mainly focused on pure research and is not seeking to develop new treatments, although one group at the Houston Physical Sciences-Oncology Center in Texas, led by Mauro Ferrari, is trying to get gold nanoparticles inside cancer cells to see if microwaves can literally cook the cells to death.

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  • Human activities are affecting the global environment in myriad ways, with numerous direct and indirect effects on ecosystems. The climate and atmospheric composition of Earth are changing rapidly. Humans have directly modified half of the ice-free terrestrial surface and use 40% of terrestrial production. Our actions are causing the sixth major extinction event in the history of life on Earth and are radically modifying the interactions among forests, fields, streams, and oceans.

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  • Unlike stratospheric ozone that protects life on earth, tropospheric ozone is highly toxic and is the main pollutant of the atmosphere of industrialized countries and cities. Its precursors are emanated from industrial activities and traffic. Generated by lightning, photochemical reactions or with free radicals, it has a density of 1.66 times greater than air and is maintained close to the ground. It decomposes easily, generating free radicals with oxidizing power. The main primary pollutants leading to ozone formation are nitrogen oxides, volatile organic compounds and methane.

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