Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 5 4 2008 10.5194/bg-5-1073-2008 http://www.biogeosciences.net/5/1073/2008/ http://www.biogeosciences.net/5/1073/2008/bg-5-1073-2008.html http://www.biogeosciences.net/5/1073/2008/bg-5-1073-2008.pdf 1073 1084 2008-07-30 Microbiology and atmospheric processes: chemical interactions of primary biological aerosols L. Deguillaume L.Deguillaume@opgc.univ-bpclermont.fr M. Leriche P. Amato P. A. Ariya A.-M. Delort U. Pöschl N. Chaumerliac H. Bauer A. I. Flossmann C. E. Morris Laboratoire de Météorologie Physique, 24 av. des Landais, 63177 Aubière, France Laboratoire d'Aérologie, 14 avenue Edouard Belin, 31400 Toulouse, France Laboratoire Synthèse Et Etude de Systèmes à Intérêt Biologique, 24 av. des Landais, 63177 Aubière, France McGill University, Departments of Chemistry and Atmospheric and Oceanic Sciences Montreal, 801 Sherbrooke St. W. Montreal, QC, Canada Max Planck Institute for Chemistry, Biogeochemistry Department, 55128 Mainz, Germany Inst. for Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9/164-AC, Vienna, Austria INRA, Unité de Pathologie Végétale UR407, 84140 Montfavet, France This paper discusses the influence of primary biological aerosols (PBA) on atmospheric chemistry and vice versa through microbiological and chemical properties and processes. Several studies have shown that PBA represent a significant fraction of air particulate matter and hence affect the microstructure and water uptake of aerosol particles. Moreover, airborne micro-organisms, namely fungal spores and bacteria, can transform chemical constituents of the atmosphere by metabolic activity. Recent studies have emphasized the viability of bacteria and metabolic degradation of organic substances in cloud water. 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