Atmospheric Sciences seminar is Nov. 12 Rebecca L. Phillips, Plant Physiologist with the USDA Agricultural Research Service in Mandan, N.D., will present a seminar on “Understanding trace gas exchange between soils, plants, and the atmosphere” at 3 p.m. Thursday, Nov. 12, in 210 Clifford Hall. The seminar is free and open to the public. All faculty, staff and students are invited to attend. Abstract: Biological mechanisms responsible for production and consumption of radiatively active trace gases, including methane, nitrous oxide and carbon dioxide, will be discussed. This seminar will review trace gas properties, processes, measurement techniques, research results and research needs. Biological processes will be reviewed, including nitrification, denitrification, methanotrophy, methanogenesis, photosynthesis and respiration. Measurement techniques discussed will include gas chromatography, membrane inlet mass spectrometry, acetylene block and eddy covariance systems. Trace gas research needs related to the ecophysiology of plants and soil biota, will be emphasized. -- Wanda Seyler, Administrative Secretary, Atmospheric Sciences, seyler@aero.und.edu, 777-3884