protactinium
Alternative form of padek
A chemical element (symbol Pa) with atomic number 91: a dense, silvery-gray actinide metal.
(biochemistry) Any polypeptide or protein that can serve as an apoprotein by binding with a lipid to form a lipoprotein.
(informal) The sound of something liquidy wobbling (e.g. jello).
そのプロタクチニウムの試料はわずか数ミリグラムしかなかったため、研究者がその性質を調べるのは困難だった。
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