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Creator:: Wheeler, Patricia A., North, Barbara B., and Stephens, Grover C.
Abstract:: Axenic cultures of 25 species of unicellular marine algae were tested for their ability to utilize nine common amino acids, supplied at high concentrations in batch culture, as a nitrogen source; most species were able to use several amino acids, although growth was often slower than on nitrate nitrogen. The...
Resource Type:: Article
Full Text:: . F. Woods [eds.], Advances in microbiology of the sea, v. 1. Amino acid uptalce by

Creator:: Wheeler, Patricia A., North, B., Littler, M., and Stephens, G.
Abstract:: Uptake of [14C]glycine by various size fractions of natural plankton communities was measured to determine if phytoplankton can compete effectively with other members of the plankton community for the free amino acids in seawater. The simultaneous occurrence of glycine uptake, plant pigments, and photosynthetic activity in the same size fractions,...
Resource Type:: Article
Full Text:: WHEELER, P., B. NORTH, M. LITTLER, AND G. STEPHENS. Uptake of

Creator:: Wheeler, Patricia A., Glibert, Patricia M., and McCarthy, James J.
Abstract:: Using 15N-labeled NH4+, we assessed the time-course of NH4+ uptake, the parameters of saturation kinetics, and the rates of incorporation of NH4+ into trichloroacetic acid-insoluble material by Chesapeake Bay phytoplankton. The amount of NH4+ taken up by the phytoplankton increased linearly with time for 2 h for all samples growing...
Resource Type:: Article
Full Text:: . Oceanogr., 27(6), 1982, 1113-1128 @ 1982, by the American Society ol LimnoloLv and Oceanography, Inc

Creator:: Wheeler, Patricia A. and McCarthy, James J.
Abstract:: The uptake of methylammonium (MA) by Chesapeake Bay phytoplankton was measured in short term experiments by using the 14C radioisotope. This uptake was inversely related to ambient NH4+ concentrations, and the specificity for uptake of both substrates was demonstrated by competitive inhibition. At stations with low ambient NH4+, MA uptake...
Resource Type:: Article
Full Text:: measurements Limnol. Oceanogr., 27(G), 1982, 1129-1140 @I 1982, by the American Society of Limnology and

Creator:: Wheeler, Patricia A. and Kirchman, David L.
Abstract:: The relative contribution of various inorganic and organic forms of nitrogen to the nitrogen requirements of picoplankton was examined with 15N tracers. Size fractionation was used to measure uptake by <1-μM size microorganisms, and inhibitors of protein synthesis were used to separate procaryotic from eucaryotic nitrogen uptake, Picoplankton utilized mainly...
Resource Type:: Article
Full Text:: 1986, by the American Society of Limnology and Oceanography, Inc. Utilization of inorganic and

Creator:: Kokkinakis, Steven A. and Wheeler, Patricia A.
Abstract:: Uptake of nitrogenous nutrients by microplankton off the Washington and Oregon coasts was measured during the 1985 upwelling period. Nitrogen uptake rates in low-NO3- waters (<5 μM) were 0.020–0.258 μmol N liter-1 h-1 and were primarily supported by regenerated nitrogen (71% of total uptake). Nitrogen uptake rates in high-NO3- waters...
Resource Type:: Article
Full Text:: 0 1987, by the American Society of Limnology and Oceanography, Inc. Nitrogen uptake and

Creator:: Wheeler, Patricia A., Kirchman, David L., Landry, Michael R., and Kokkinakis, Steven A.
Abstract:: Diel periodicity in NH4+ uptake and regeneration in the nutrient-rich environment of the oceanic subarctic Pacific was examined. Surface water was incubated in large shipboard microcosms that allowed repeated sampling of the planktonic community for NH4+ cycling rates, bacterial production rates, and population densities of the dominant autotrophs and heterotrophs....
Resource Type:: Article
Full Text:: Q 1989, by the American Society of Limnology and Oceanography, Inc. Diel periodicity in ammonium

Creator:: Kirchman, David L., Keil, Richard G., and Wheeler, Patricia A.
Abstract:: The purpose of this study was to test the hypothesis that NH4+ uptake by heterotrophic bacteria in the subarctic Pacific is C limited. Addition of glucose (0.5–1.0 μM) stimulated NH4+ uptake in unfractionated water but had no effect on bacterial abundance. Glucose stimulation of NH4+ uptake was even greater in...
Resource Type:: Article
Full Text:: . Oceanogr.. 35(6), 1990, 1258-1266 0 1990, by the American Society of Limnology and Oceanography, Inc

Creator:: Wheeler, Patricia A. and Kokkinakis, Steven A.
Abstract:: Seasonal and diel changes in nutrient concentrations and nitrogen assimilation rates were used to assess the effects of NH4+ on NO3- assimilation. Surface-water NO3- concentrations ranged from 6 to 17 μM while NH4+ concentrations ranged from 0 to 0.4 μM. Total N assimilation ranged from 84 to 732 nM d–1...
Resource Type:: Article
Full Text:: , by the American Society of Limnology and Oceanography, Inc. Ammonium recycling limits nitrate use

Creator:: Miller, Charles B., Frost, Bruce W., Wheeler, Patricia A., Landry, Michael R., Welschmeyer, Nicholas, and Powell, Thomas M.
Abstract:: It has been suggested that production in offshore waters of the subarctic Pacific is limited by availability of dissolved Fe. Although that is not yet adequately established, the functional consequences of the limitation (if it exists) can be characterized from the results of the Subarctic Pacific Ecosystem Research (SUPER) program....
Resource Type:: Article
Full Text:: -1615 Q 199 1, by the American Society of Limnology and Oceanography, Inc. Ecological dynamics in the

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