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Naturally occurring organics were extracted from water collected from Skinface Pond near Aiken, S.C. Organics were separated into four nominal diameter size fractions (I, &gt;0.0183; II, 0.0183 to 0.0032; III, 0.0032 to 0.0009; IV, &lt;0.0009 μm) by membrane ultrafiltration and introduced intoScenedesmus obliquus andAeromonas hydrophila cultures to determine their effects on241 Am availability for uptake. Effects on241 Am uptake were determined in actively growingS. obliquus cultures after 96 h of growth and in dense cultures of nongrowing cells after 4 h. Uptake byA. hydrophila was determined after 4 and 24 h in actively growing cultures. All organic fractions stimulatedS. obliquus growth, with the most pronounced effects due to larger organic fractions, whereas no apparent growth stimulation ofA. hydrophila was observed for any organic fraction. For both long-term and short-term studies, cellular241 Am concentration (picocuries/cell) increased with increasing241 Am concentration forS. obliquus andA. hydrophila. Fraction IV increased241 Am uptake by bothS. obliquus andA. hydrophila during 4-h incubations. During 96-h incubations fraction I was flocculated and cosedimented, withS. obliquus andA. hydrophila cells causing an apparent increase in241 Am uptake. Fractions II and III reduced apparent241 Am uptake byS. obliquus as a result of biological dilution caused by increased algal growth due to the organics. Fraction IV caused a reduction in241 Am uptake byS. obliquus not attributable to biological dilution. Organics increased241 Am uptake byA. hydrophila during 4- and 24-h incubations.A. hydrophila also caused flocculation of fraction I during 96-h incubations.

applied and environmental microbiology

Effects of Naturally Occurring Aquatic Organic Fractions on 241 Am Uptake by Scenedesmus obliquus (Chlorophyceae) and Aeromonas hydrophila (Pseudomonadaceae)