Institution
National Ocean Service
Government•Silver Spring, Maryland, United States•
About: National Ocean Service is a government organization based out in Silver Spring, Maryland, United States. It is known for research contribution in the topics: Algal bloom & Population. The organization has 500 authors who have published 643 publications receiving 46096 citations.
Topics: Algal bloom, Population, Brevetoxin, Domoic acid, Karenia brevis
Papers published on a yearly basis
Papers
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TL;DR: The direction and magnitude of daytime changes in cellular zinc and iron were dependent on the extent of photochemical redox cycling of iron chelates, which increased iron uptake rates during the day, as each of these parameters exhibited its own unique diurnal pattern.
Abstract: We conducted culture experiments with the diatom Thalassiosira pseudonanato determine the interactive effects of day length and biologically available concentrations of iron and zinc on cellular iron (Fe), zinc (Zn), chlorophyll a (Chl a), and fixed carbon (C) throughout the light period. Specific rates of C-fixation and growth were also measured. Specific C-fixation rates showed a single linear relation with the cellular Fe : C ratio regardless of the photoperiod. Decreasing the photoperiod from 14 to 7 h increased the mean daytime cellular Fe : C ratio by 40%, the specific C-fixation rate by 34%, and the Chla : C ratio by 91% in mildly iron-limited cultures. These changes reflect a cellular acclimation to the shortened light period. The higher cellular iron level apparently allowed for synthesis of additional iron-rich proteins (e.g., those utilized in photosynthetic electron transport) needed to support the increased rate of C-fixation. Mean cellular Chla concentration decreased linearly with decreasing specific growth rate under iron and zinc limitation, thereby allowing the cells to maintain a balance between light harvesting and biosynthesis. Cellular concentrations of carbon, Chl a, zinc, and iron typically varied during the light period because of the day‐night differences in rates of C-fixation, Chl a synthesis, growth, and metal uptake. Cell carbon concentrations increased by 36‐96% during the light period, reflecting daytime storage of fixed carbon to support nighttime respiration and growth. Cellular zinc concentrations decreased by 25% during the light period owing to higher daytime specific growth rates and resulting higher rates of biodilution. By contrast, the direction of change in cellular iron concentrations was dependent on the extent of photochemical redox cycling of iron chelates, which increased iron uptake rates during the day. The direction and magnitude of daytime changes in cellular zinc and iron were also dependent on the parameter (cell volume, cell numbers, or carbon) to which the cellular metal was normalized, as each of these parameters exhibited its own unique diurnal pattern.
45 citations
Commonwealth Scientific and Industrial Research Organisation1, Council for Scientific and Industrial Research2, National Oceanic and Atmospheric Administration3, Plymouth Marine Laboratory4, University of California, Merced5, University of Stirling6, University of Tartu7, Swiss Federal Institute of Aquatic Science and Technology8, University of Cape Town9, United States Environmental Protection Agency10, National Ocean Service11, Oak Ridge Institute for Science and Education12
45 citations
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TL;DR: The greater distribution of toxin to eggs as compared to flesh suggests that fish with low to moderate flesh toxin levels would maternally transfer detrimental amounts of ciguatoxins to their offspring.
45 citations
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TL;DR: Numerical model simulations that turned forcings on and off highlighted the importance of the two river pulses in causing the widespread flooding and underscored the influence of the interaction between land-derived discharge and ocean-derived surge along different parts of the Houston-Galveston Bay system.
45 citations
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TL;DR: Findings indicate the most commonly occurring PbTx-2 is rapidly transformed to a polar metabolite of a reduced biological activity that appears in blood and remains for up to 8 h, yet is cleared mostly to the urine within 24 h.
45 citations
Authors
Showing all 501 results
Name | H-index | Papers | Citations |
---|---|---|---|
Charles H. Peterson | 77 | 202 | 28829 |
David T. Sandwell | 65 | 245 | 20058 |
William G. Sunda | 57 | 103 | 13933 |
Patricia A. Tester | 50 | 115 | 7012 |
James E. Byers | 49 | 137 | 9385 |
Jonathan A. Hare | 45 | 126 | 7259 |
Hunter S. Lenihan | 43 | 90 | 19833 |
Walter H. F. Smith | 42 | 111 | 30201 |
Richard P. Stumpf | 39 | 114 | 6034 |
Jonathan H. Grabowski | 39 | 120 | 5874 |
John S. Ramsdell | 39 | 115 | 4038 |
Patricia A. Fair | 38 | 115 | 3926 |
James C. Ryan | 37 | 101 | 5362 |
R. Wayne Litaker | 37 | 78 | 3947 |
Mark Busman | 36 | 84 | 4683 |