海産珪藻による亜鉛の吸収について

概要

論文の詳細を見る
In this study, three diatoms, Cyclotella nana, Phaeoductylum tricornutum and Thalassiosira decipiens, were used for estimating the requirement and the toxicity of zinc. For their normal growth the diatoms required zinc at the level of 0.1μg/l. Thus, the zinc levels in the seawater do not make a limiting factor for maintaining the potential primary production level resulting from the estimation with the oceanic phosphate-phosphorus. The zinc toxicity at high con-centration was suppressed by the presence of chelator (EDTA). In the case of experiments with EDTA the amount of zinc taken up by diatoms was found to be independent of the ambient zinc concentration, while without EDTA the uptake of zinc varied depending upon the concentration. The minimum requirement of zinc for normal growth per unit-weight of diatom was estimated as 1-3 ppm, and the diatoms, which were harvested from the culture medium with EDTA, accumulated more zinc in their body, by one order of magnitude, than their minimum requirement.
日本水産學會の論文