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• W2151229279 abstract "AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsSpecials AME 41:221-232 (2005) - doi:10.3354/ame041221 Tangential flow diafiltration: an improved technique for estimation of virioplankton production Danielle M. Winget1, Kurt E. Williamson2, Rebekah R. Helton2, K. Eric Wommack1,2,* 1College of Marine Studies, and 2Department of Plant and Soil Sciences, Delaware Biotechnology Institute, University of Delaware, 15 Innovation Way, Newark, Delaware 19711, USA *Corresponding author. Email: wommack@dbi.udel.edu ABSTRACT: Accurate estimates of viral production in natural environments are critical for assessing the impacts of viral lysis on bacterial mortality and dissolved organic matter release. Here, viral production was estimated using a tangential flow diafiltration (TFD) dilution method, which reduced viral abundance to about 25% of ambient while maintaining near ambient levels of bacterial abundance. In subsequent incubations, the rate of virus-like particle increase was measured and used to calculate viral production. TFD viral production estimates were compared to those from simultaneous incubations using a vacuum diafiltration procedure. At 4 stations in the Chesapeake and Delaware Bays, viral production averaged 4.8 ± 1.7 × 1010 and 5.9 ± 4.4 × 1010 viruses l–1 d–1 as assessed by the TFD and vacuum methods, respectively. The TFD procedure improved upon the vacuum-based method by recovering significantly more of the bacterial community and requiring less sample processing time. Optimization tests of the TFD procedure found that a 0.22 µm pore size filter with a flushing rate of 40 ml min–1, and a flushing volume 4-fold the initial sample volume gave the best combination of bacterial recovery, viral dilution, and processing time. Based on TFD viral production estimates, viral lysis was responsible for the loss of 14 to 93% of the bacterial standing stock and the release of 22 to 47 µg C l–1 d–1 in the Chesapeake and Delaware Bays. These results indicate that viral lysis is a significant factor for microbial mortality and dissolved organic matter cycling within these estuaries. KEY WORDS: Viral production · Tangential flow diafiltration · Viral-mediated mortality · Dilution method Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in AME Vol. 41, No. 3. Online publication date: December 23, 2005 Print ISSN: 0948-3055; Online ISSN: 1616-1564 Copyright © 2005 Inter-Research." @default.
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• W2151229279 date "2005-01-01" @default.
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• W2151229279 title "Tangential flow diafiltration: an improved technique for estimation of virioplankton production" @default.
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