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      SUBSTRATE SUPPLY FOR CALCITE PRECIPITATION IN EMILIANIA HUXLEYI: ASSESSMENT OF DIFFERENT MODEL APPROACHES

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      General Information:

      Citation:
      Holtz, L. M. , Thoms, S. , Langer, G. and Wolf-Gladrow, D. (2013): SUBSTRATE SUPPLY FOR CALCITE PRECIPITATION IN EMILIANIA HUXLEYI: ASSESSMENT OF DIFFERENT MODEL APPROACHES , Journal of Phycology, 49 , pp. 417-426 . doi: 10.1111/jpy.12052
      Cite this page as:
      hdl:10013/epic.41715
      DOI:
      https://doi.org/10.1111/jpy.12052
      Contact Email:
      Lena-Maria.Holtz@awi.de
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      hdl:10013/epic.41715.d002
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      hdl:10013/epic.41715.d008
      Abstract:

      Over the last four decades, different hypotheses of Ca2+ and dissolved inorganic carbon transport to the intracellular site of calcite precipitation have been put forth for Emiliania huxleyi (Lohmann) Hay & Mohler. The objective of this study was to assess these hypotheses by means of mathematical models. It is shown that a vesicle-based Ca2+ transport would require very high intravesicular Ca2+ concentrations, high vesicle fusion frequencies as well as a fast membrane recycling inside the cell. Furthermore, a kinetic model for the calcification compartment is presented that describes the internal chemical environment in terms of carbonate chemistry including calcite precipitation. Substrates for calcite precipitation are transported with different stoichiometries across the compartment membrane. As a result, the carbonate chemistry inside the compartment changes and hence influences the calcification rate. Moreover, the effect of carbonic anhydrase (CA) activity within the compartment is analyzed. One very promising model version is based on a Ca2+/H+ antiport, CO2 diffusion, and a CA inside the calcification compartment. Another promising model version is based on an import of Ca2+ and HCOÀ and an export of H+.

      Further Details:

      Item Type:
      Article
      Authors:
      Holtz, Lena-Maria ; Thoms, Silke ; Langer, Gerald ; Wolf-Gladrow, Dieter
      Divisions:
      AWI Organizations > Biosciences > BioGeoScience
      Primary Division:
      Organizations > AWI Organizations > Biosciences > BioGeoScience
      Programs:
      Helmholtz Research Programs > PACES I (2009-2013) > TOPIC 1: The Changing Arctic and Antarctic > WP 1.6: Ocean Warming and Acidification: Organisms and their changing Role in Marine Ecosystems
      Primary Topic:
      Helmholtz Programs > Helmholtz Research Programs > PACES I (2009-2013) > TOPIC 1: The Changing Arctic and Antarctic > WP 1.6: Ocean Warming and Acidification: Organisms and their changing Role in Marine Ecosystems
      Eprint ID:
      33197
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