Index Catalog // ScholarsArchive@OSU

Creator:: Sherr, Evelyn and Sherr, Barry F.
Resource Type:: Article
Full Text:: SHERR, EVELYN, AND BARRY SHERR. Role of microbes in pelagic food

Creator:: Longnecker, K., Sherr, Barry F., and Sherr, Evelyn
Abstract:: We evaluated whether bacteria with higher cell-specific nucleic acid content (HNA) or an active electron transport system, i.e., positive for reduction of 5-cyano-2,3-ditolyl tetrazolium chloride (CTC), were responsible for the bulk of bacterioplankton metabolic activity. We also examined whether the phylogenetic diversity of HNA and CTC-positive cells differed from the...
Resource Type:: Article
Full Text:: from CTC-reducing cells (J. Gasol, personal communication). These granules would not be labeled with

Creator:: Sherr, Barry F., Sherr, Evelyn, and McDaniel, Julie
Abstract:: Grazing by phagotrophic flagellates and ciliates is a major source of mortality for bacterioplankton in both marine and freshwater systems. Recent studies have demonstrated a positive relationship between clearance rate and prey size for bacterivorous protists. We tested the idea that, by selectively grazing the larger (more actively growing or...
Resource Type:: Article
Full Text:: Frequency of Dividing Cells in Bacterioplankton Assemblagest BARRY F. SHERR,1* EVELYN B. SHERR,' AND JULIE

Creator:: Sherr, Evelyn, Sherr, Barry F., and Cowles, Timothy J.
Abstract:: Variation in bacterial abundance and activity was assessed by sampling the upper 35 to 80 m of the water column during 2 to 5 d periods at 3 sites: eutrophic-mesotrophic midshelf, mesotrophic-oligotrophic slope, and oligotrophic gyre edge, off the Oregon coast in late summer 1997 and 1998. Bacterial abundances varied...
Resource Type:: Article
Full Text:: bacterial activity in the Northeast Pacific Ocean off Oregon, USA Evelyn B. Sherr*, Barry F. Sherr, Timothy

Creator:: Tranvik, Lars J., Sherr, Evelyn, and Sherr, Barry F.
Abstract:: A variety of macromolecules labeled with FITC (fluorescein isothiocyanate), including carbohydrates (dextran) and proteins (ferritin, casein, albumin, concavalin A), spanning a range of molecular weights from 55 to 2000 kD, were actively ingested by marine heterotrophic flagellates at substrate concentrations of 1 to 10 mg/L. The uptake capacity for the...
Resource Type:: Article
Full Text:: flagellates in seawater Lars J. ~ r a n v i k ' , E. B. sherr2, B. F. sherr2 'Dept of Ecology, Limnology

Creator:: Sherr, Evelyn, Sherr, Barry F., Fallon, Robert D., and Newell, Steven Y.
Abstract:: Small, aloricate ciliates with equivalent spherical cell diameters <20 µm (biovolume <4,000 µm3) compose, on average, 4–57% of the total biomass of heterotrophic (apochlorotic) nanoplankton in diverse marine systems. Biomass production of nanoplanktonic ciliates in a southeastern U.S. estuary was also a significant part of the total production of heterotrophic...
Resource Type:: Article
Full Text:: SHERR, EVELYN B., BARRY F. SHERR, ROBERT D. FALLON, AND STEVEN Y

Creator:: Gonzalez, Juan M., Sherr, Evelyn, and Sherr, Barry F.
Abstract:: Previous work has demonstrated selective feeding by bacterivorous protists on the of prey size. Other prey characteristics may also affect protist grazing rates. In this relative uptake rates of fluorescently labeled bacterial (FLB) cells made from starving bacteria (S-FLB), and of live-stained motile vs non-motile bacteria by marine We also...
Resource Type:: Article
Full Text:: starving, and on motile versus nonmotile, bacterial prey Juan M. Gonzalez*, Evelyn B. Sherr, Barry F

Creator:: Gonzalez, Juan M., Sherr, Barry F., and Sherr, Evelyn
Abstract:: We propose quantification of the activity of digestive enzymes as a novel way to estimate rates of protist grazing in natural waters. Our first application of this approach was determination of protistan bacterivory by assaying the activity of lysozyme at acid pH. Lysozyme specifically degrades peptidoglycan, a major structural component...
Resource Type:: Article
Full Text:: protistan grazing: the acid lysozyme assay for bacterivory Juan M. Gonzalez*, Barry F. Sherr, Evelyn B

Creator:: Wolfe, Gordon V., Sherr, Evelyn, and Sherr, Barry F.
Abstract:: Degradation and release to solution of intracellular dimethylsulfoniopropionate (DMSP) from Emiliania huxleyi 370 was observed during grazing by the heterotrophic dinoflagellate Oxyrrhis marina in 24 h bottle incubations. Between 30 and 70 % of the lost algal DMSP was metabolized by the grazers without production of dimethylsulfide (DMS) when grazer...
Resource Type:: Article
Full Text:: b y Oxyrrhis marina Gordon V. Wolfe, Evelyn B. Sherr, Barry F. Sherr College of Oceanic and

Creator:: Suzuki, Marcelino T., Sherr, Evelyn, and Sherr, Barry F.
Abstract:: We compared estimates of bacterial abundance and of average bacterial cell size based on direct counts of bacterioplankton cells stained with acridine orange (AO) or 4’-6-diamidino-2-phenylidole (DAPI). Estimates of numbers mll–1 of bacteria stained with DAPI were on average 70% (range 57–82%) of bacterial counts made with AO as the...
Resource Type:: Article
Full Text:: SUZUKI, MARCELINO T., EVELYN B. SHERR, AND BARRY F. SHERR. DAPI

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