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Seminario Generale congiunto DIFI Mercoledi’ 9 Maggio 2018 Ora: 16.00 Aula: 500 Titolo: ChAMBRe: a new atmospheric simulation Chamber for Aerosol Modelling and Bio-aerosol Research Speaker: Dr. Dario Massabo' (Dip.to di Fisica Universita' di Genova) Abstract: Atmospheric pollution is one of the hot topic in research fields since it is responsible for adverse health issues as well as by inducing global climate change. Atmospheric simulation chambers are exploratory platforms used to study various atmospheric processes in realistic but controlled conditions. The seminar presents a new facility specifically designed for the research on atmospheric bio-aerosol as well as the protocols to produce, inject, expose and collect bio-aerosols. ChAMBRe (Chamber for Aerosol Modelling and Bio-aerosol Research) is installed at the Physics Department of the University of Genova, Italy, and it is a node of the EUROCHAMP-2020 consortium. The chamber is made of stainless steel with a total volume of about 2.2 m3. The lifetime of aerosol with dimension from a few hundreds of nanometers to a few microns varies from about 10 to 2 hour. Characteristic parts of the facility are the equipment and the procedures to grow, inject and extract bacterial strains in the chamber volume while preserving their viability. Bacteria in the atmosphere have an impact at several levels: health related issues, cloud formation, geochemistry and as part themselves of the atmospheric ecosystem. ChAMBRe will host experiments to study the bacterial viability versus the air quality level, i.e. the atmospheric concentration of gaseous and aerosol pollutants. The seminar will report the results of the characterization tests as well as of the first experiments performed on two bacterial strains belonging to the Gram positive and Gram negative groups. A reproducibility at the 10% level has been obtained in repeated injections and collection runs with a clean atmosphere, assessing this way the chamber sensitivity for systematic studies on bacterial viability vs. environmental conditions. --

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