Accumulation of vanadium during embryogenesis in the vanadium-rich ascidian,Ascidia gemmata |
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| Authors: | H Michibata J Uchiyama Y Seki T Numakunai T Uyama |
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| Institution: | (1) Mukaishima Marine Biological Laboratory, Faculty of Science, Hiroshima University, Mukaishima-cho, 722 Hiroshima, Japan;(2) Asamushi Marine Biological Station, Tohoku University, Asamushi, 039 Aomori, Japan |
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| Abstract: | It is a remarkable and previously unrecognized fact that ascidians, which are known to contain high levels of vanadium in
their blood cells, begin to accumulate vanadium during embryogenesis. This study revealed that the accumulation starts quite
dramatically 2 wk after fertilization, and 2 mo later, the amount of vanadium in larvae is 600,000 times higher than that
in the unfertilized egg. These results were obtained by neutron activation analysis, a highly sensitive method for determining
levels of vanadium, in theAscidia gemmata, the ascidian that contains the highest known levels of vanadium and accumulates vanadium at 150 mM in its blood cells, a concentration that corresponds to 4,000,000 times the concentration in sea-water. |
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| Keywords: | Ascidian tunicate vanadium accumulation embryogenesis |
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