Bacterial Degradation of Dissolved Organic Matter from Two Northern Michigan Streams

摘要: This study used high-pressure size exclusion chromatography (HPSEC) to measure the changes in molecular weight distributions of dissolved organic matter (DOM) two Northern Michigan streams following inoculation with bacterial concentrates from same locations. During initial 12 h experiment, average (M w ) DOM decreased, as high components were lost solution. After h, M increased, primarily because a loss intermediate lower components. Leucine incorporation showed little or no metabolism during first but increased substantially after h. The period suggests preferential adsorption these surfaces, perhaps followed by metabolism. suggested interpretation is consistent previous observations higher molecul...