Formation of iodide-iodine in the ocean

Tsunogai, Shizuo; Sase, Takashi

doi:10.1016/0011-7471(69)90037-0

Cited by 73 publications

(80 citation statements)

References 14 publications

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“…The enzyme nitrate reductase (NR) has been postulated to perform the reduction of iodate to iodide in phytoplankton and bacteria when nitrate is limiting in the ocean (Tsunogai & Sase 1969). Our work does not support that view, as our cultures from the first experiment did not run into nitrate limitation although we still observed iodide production.…”

Section: Iodate Reduction By Nitrate Reductasecontrasting

confidence: 70%

“…2b & 3b). The increase in bacteria goes hand in hand with the increase in iodide, and we cannot totally rule out that bacteria also reduce a certain amount of iodate to iodide as they are capable of doing so (Tsunogai & Sase 1969, Amachi et al 2007. In all other cultures, bacteria were minor constituents and can be neglected (Figs.…”

Section: The Role Of Bacteriamentioning

confidence: 98%

“…Iodine exists principally in open seawater as the inorganic redox forms iodate (IO 3 -) and iodide (I -), with a total concentration of 400 to 500 nmol l -1 in most oceanic regions. While iodate predominates in the deep ocean (Tsunogai & Sase 1969, Elderfield & Truesdale 1980, Farrenkopf et al 1997), significant amounts of iodide are found in surface and near-bottom layers (Kennedy & Elderfield 1987, Wong 1991, Luther et al 1995. The interconversion of the redox couple iodate-iodide within the euphotic zone, together with the biophilic nature of iodine, has given rise to the idea that iodine speciation is linked to primary productivity (Sugawara & Terada 1967, Tsunogai & Henmi 1971, Elderfield & Truesdale 1980, Moisan et al 1994, Campos et al 1996, Truesdale et al 2000.…”

Section: Introductionmentioning

confidence: 99%

“…The conversion of iodate to iodide has been shown in batch culture at ambient iodate concentrations (Wong et al 2002). Much of this work has been carried out to test the hypothesis put forward by Tsunogai & Sase (1969) that nitrate reductase can reduce iodate to iodide in the ocean when nitrate is limiting. This hypothesis grew out of the earlier finding by Egami & Sato (1947) that nitrate reductase is capable of reducing iodate under physiological conditions.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Transformation of iodate to iodide in marine phytoplankton driven by cell senescence

Bluhm¹,

Croot²,

Wuttig³

et al. 2010

Aquat. Biol.

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Section: Iodate Reduction By Nitrate Reductasecontrasting

confidence: 70%

Section: The Role Of Bacteriamentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Transformation of iodate to iodide in marine phytoplankton driven by cell senescence

Bluhm¹,

Croot²,

Wuttig³

et al. 2010

Aquat. Biol.

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“…While iodate is regarded as the thermodynamically stable form of iodine in seawater (Sill&n 1961), there are significant amounts of iodide in surface and near-bottom layers (Sugawara and Terada 1957;Tsunogai 1971;Wong 1977), in apparent redox disequilibrium.…”

mentioning

confidence: 99%

Influence of phytoplankton on iodine speciation in seawater

Butler

Smith

Fisher³

1981

Limnology & Oceanography

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Some characteristics of arsenate transport in a marine cyanobacterium, Synechococcus sp.

Takahashi

Kawakami

Iwakiri

et al. 2001

Applied Organom Chemis

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The mechanism of arsenate incorporation in the cells of a unicellular marine cyanobacterium, Synechococcus sp., was investigated. A lag period in arsenate incorporation, probably caused by an inhibitory effect of phosphate absorbed on the cell surface, was observed. Although arsenate incorporation into the cells of cyanobacterium was several times faster than that of phosphate, it was readily inhibited by addition of phosphate, also suggesting inhibition caused by phosphate. The Michaelis-Menten type of equation was employed for the simulation of incorporation, and a nonlinear fitting was applied for the estimation of the kinetic parameters in the equation. Analysis based on the assumption that arsenate is incorporated via the phosphate transport system in cells suggested that arsenate competes with phosphate for entry into cells and each species acts as a competitive inhibitor to each other. The affinity of arsenate with the transport system was much less than that of phosphate, but it was not low enough for elucidation of an almost complete inhibition of arsenate incorporation by phosphate, and another mechanism to block the approach of arsenate to the transport system was deduced to exist. The inhibitory effect of phosphate on arsenate incorporation seemed responsible for alleviation of the toxicity of arsenate in the cells.

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Formation of iodide-iodine in the ocean

Cited by 73 publications

References 14 publications

Transformation of iodate to iodide in marine phytoplankton driven by cell senescence

Transformation of iodate to iodide in marine phytoplankton driven by cell senescence

Influence of phytoplankton on iodine speciation in seawater

Some characteristics of arsenate transport in a marine cyanobacterium, Synechococcus sp.

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