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Ozaki, Takuo; Ambe, S.; Abe, Tomoko; Francis, A.J.

doi:10.1023/a:1026258125666

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2005

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“…259 Other topics Short lived positron emitting isotopes have been used to image the movement of water 260 (as [ 15 O]H 2 O) and other elements in plants. In the latter experiment a 'packet' of radioisotopes including sodium-24, magnesium-28, potassium-43 and calcium-47 was made 261 by irradiating a titanium target with a 135 MeV carbon-12 beam. The possibility of using a variety of materials, such as glasses 262 or slags, 263,264 for the immobilisation of radioisotopes is still being investigated as is fallout 265,266 from nuclear accidents.…”

Section: Detectionmentioning

confidence: 99%

28 Radiochemistry

Urch

2004

Annu. Rep. Prog. Chem., Sect. A: Inorg. Chem.

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Section: Detectionmentioning

confidence: 99%

28 Radiochemistry

Urch

2004

Annu. Rep. Prog. Chem., Sect. A: Inorg. Chem.

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Competitive Inhibition and Selectivity Enhancement by Ca in the Uptake of Inorganic Elements (Be, Na, Mg, K, Ca, Sc, Mn, Co, Zn, Se, Rb, Sr, Y, Zr, Ce, Pm, Gd, Hf) by Carrot (Daucus carota cv. U.S. harumakigosun)

Ozaki¹,

Ambe

Abe

et al. 2005

BTER

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We investigated the uptake of inorganic elements (Be, Na, Mg, K, Ca, Sc, Mn, Co, Zn, Se, Rb, Sr, Y, Zr, Ce, Pm, Gd, and Hf) and the effect of Ca on their uptake in carrots (Daucus carota cv. U.S. harumakigosun) by the radioactive multitracer technique. The experimental results suggested that Na, Mg, K, and Rb competed for the functional groups outside the cells in roots with Ca but not for the transporter-binding sites on the plasma membrane of the root cortex cells. In contrast, Y, Ce, Pm, and Gd competed with Ca for the transporters on the plasma membrane. The selectivity, which was defined as the value obtained by dividing the concentration ratio of an elemental pair, K/Na, Rb/Na, Be/Sr, and Mg/Sr, in the presence of 0.2 and 2 ppm Ca by that of the corresponding elemental pair in the absence of Ca in the solution was estimated. The selectivity of K and Rb in roots was increased in the presence of Ca. The selectivity of Be in roots was not affected, whereas the selectivity of Mg was increased by Ca. These observations suggest that the presence of Ca in the uptake solution enhances the selectivity in the uptake of metabolically important elements against unwanted elements.

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Cited by 2 publications

References 15 publications

28 Radiochemistry

28 Radiochemistry

Competitive Inhibition and Selectivity Enhancement by Ca in the Uptake of Inorganic Elements (Be, Na, Mg, K, Ca, Sc, Mn, Co, Zn, Se, Rb, Sr, Y, Zr, Ce, Pm, Gd, Hf) by Carrot (Daucus carota cv. U.S. harumakigosun)

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