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Dissolved inorganic carbon utilizaiton in relation to calcite production in Emiliania huxleyi (Lohmann) Kamptner.

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Title: Dissolved inorganic carbon utilizaiton in relation to calcite production in Emiliania huxleyi (Lohmann) Kamptner.
Authors: Dong, L. F.1, Nimer, N. A.1, Okus, E.1, Merrett, M. J.1
Source: New Phytologist. Apr93, Vol. 123 Issue 4, p679-684. 6p.
Subjects: Carbon, Calcite, Coccolithus huxleyi, Calcification, Photosynthesis, Alkaline phosphatase
Abstract: The relationship between calcite production and dissolved inorganic carbon (DIC) utilization was investigated using high- and low-calcifying strains of Emiliania huxleyi aerated with either air (0.03 % v/v CO2) or CO2-free air. With cultures grown on air, calcite production was eight-fold greater in the high-calcifying culture, but growth rates for high- and low-calcifying cultures were similar. Growth and calcite production were accompanied by a concomitant decrease in DIC and free CO2 in the high-calcifying culture, showing that HCO3- provides inorganic carbon for calcite synthesis. In low-calcifying cultures DIC and free CO2 were relatively constant, confirming that cells acquire inorganic carbon mainly by the diffusive entry of free CO2. When cultures were aerated with CO2-free air the free CO2 concentration was below the K0.5[CO2] for high- and low-calcifying cells and the low-calcifying cells were unable to grow. Growth of high-calcifying cells was observed, and the calcite yield was little changed from cultures gassed with air (0.03% v/v CO2). At these minimal CO2 concentrations HCO3- may provide inorganic carbon for calcite synthesis and CO2 for photosynthesis, allowing growth to occur. Calcite synthesis by E. huxleyi decreases DIC and carbonate alkalinity in cultures not in equilibrium with the gas phase. [ABSTRACT FROM AUTHOR]
Copyright of New Phytologist is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 12499851
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  Data: Dissolved inorganic carbon utilizaiton in relation to calcite production in <em>Emiliania huxleyi</em> (Lohmann) Kamptner.
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  Data: <searchLink fieldCode="JN" term="%22New+Phytologist%22">New Phytologist</searchLink>. Apr93, Vol. 123 Issue 4, p679-684. 6p.
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  Data: <searchLink fieldCode="DE" term="%22Carbon%22">Carbon</searchLink><br /><searchLink fieldCode="DE" term="%22Calcite%22">Calcite</searchLink><br /><searchLink fieldCode="DE" term="%22Coccolithus+huxleyi%22">Coccolithus huxleyi</searchLink><br /><searchLink fieldCode="DE" term="%22Calcification%22">Calcification</searchLink><br /><searchLink fieldCode="DE" term="%22Photosynthesis%22">Photosynthesis</searchLink><br /><searchLink fieldCode="DE" term="%22Alkaline+phosphatase%22">Alkaline phosphatase</searchLink>
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  Data: The relationship between calcite production and dissolved inorganic carbon (DIC) utilization was investigated using high- and low-calcifying strains of <em>Emiliania huxleyi</em> aerated with either air (0.03 % v/v CO2) or CO2-free air. With cultures grown on air, calcite production was eight-fold greater in the high-calcifying culture, but growth rates for high- and low-calcifying cultures were similar. Growth and calcite production were accompanied by a concomitant decrease in DIC and free CO2 in the high-calcifying culture, showing that HCO3- provides inorganic carbon for calcite synthesis. In low-calcifying cultures DIC and free CO2 were relatively constant, confirming that cells acquire inorganic carbon mainly by the diffusive entry of free CO2. When cultures were aerated with CO2-free air the free CO2 concentration was below the <em>K<sm>0.5[CO2] for high- and low-calcifying cells and the low-calcifying cells were unable to grow. Growth of high-calcifying cells was observed, and the calcite yield was little changed from cultures gassed with air (0.03% v/v CO2). At these minimal CO2 concentrations HCO3- may provide inorganic carbon for calcite synthesis and CO2 for photosynthesis, allowing growth to occur. Calcite synthesis by <em>E. huxleyi</em> decreases DIC and carbonate alkalinity in cultures not in equilibrium with the gas phase. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of New Phytologist is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1111/j.1469-8137.1993.tb03777.x
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 6
        StartPage: 679
    Subjects:
      – SubjectFull: Carbon
        Type: general
      – SubjectFull: Calcite
        Type: general
      – SubjectFull: Coccolithus huxleyi
        Type: general
      – SubjectFull: Calcification
        Type: general
      – SubjectFull: Photosynthesis
        Type: general
      – SubjectFull: Alkaline phosphatase
        Type: general
    Titles:
      – TitleFull: Dissolved inorganic carbon utilizaiton in relation to calcite production in <em>Emiliania huxleyi</em> (Lohmann) Kamptner.
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            NameFull: Dong, L. F.
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            NameFull: Nimer, N. A.
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            NameFull: Okus, E.
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            NameFull: Merrett, M. J.
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            – D: 01
              M: 04
              Text: Apr93
              Type: published
              Y: 1993
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