キンギョによる^<24>Naおよび^<42>Kの摂取

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The present paper deals with whether and to what extent radiosodium or radiopotassium is taken up by the gold fish, Carassius auratus (LINNE), from surrounding medium. Gold fishes, (body length, ca. 2.5cm) were immersed in 200ml of water containing ^<24>Na (2.7μc/ml) or ^<42>K (0.21μc/ml). After the lapse of 1.5, 5, 18, 44 or 109 hours, each of them was washed with running water for 10-15 minutes so as to remove the remaining isotope from the body surface, and then it was dissected into three parts: eyes, liver and the rest of body. The radioactivity of ashed samples of them was measured with a G-H counter. The experimental results are shown in Tables I and II. 1)With increasing time both labeled sodium and potassium were gradually incorporated into organs, and the highest uptake of the isotopes was observed about 100 hours after the start of experiments. With regard to ^<24>Na and ^<42>K retained by the whole body, the highest retention per unit fresh weight was almost equal to half the concentration of each isotope present in the immersion solution. 2)Radiosodium was apparently incorporated into the eye almost as much as in the body, while that retained in the liver about half as much. On the other hand, radiopotassium was incorporated into the liver almost as much as in the body, but found only a little in the eye. 3)The eye always retained about 3 per cent of radiosodium or 2 per cent of rediopotassium incorporated by the fish, irrespective of the duration of immersion. 4)As shown in an example of Table III, it was elucidated that the actual radioactivity of radiosodium or radiopotassium retained by every organ just at the end of immersion period was the highest in case of the fish immersed for 18 hours.
社団法人日本動物学会の論文
1959-04-15

キンギョによる^<24>Naおよび^<42>Kの摂取

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