Absorption of Vanadium by Tunicates
Absorption of Vanadium by Tunicates
复制标题
被囊类动物对钒的吸收
作者：
M. Kalk
某些被囊动物对钒的富集是一种对海洋中稀有元素的极端选择性吸收，在海洋中钒以其最高价态存在：钒酸根阴离子或可能是钒氧阳离子2。在被囊动物组织中，色原hsemo-vanadin是一种还原性物质，含有与硫酸盐络合的三价钒，并与蛋白质的氨基螯合。还原性能有利于钒的检测在锇酸固定的组织的电子显微照片。已经证实3，血细胞的表面结合已经进入血浆的钒酸盐，而没有任何选择性吸收。我的证据精确地指出了血细胞中螯合作用的位点，并表明钒离子的选择性吸附。
THE accumulation of vanadium by certain species of tunicates is a case of extremely selective absorption of a rare element from the sea1, where it occurs at its highest valency: as vanadate anion or perhaps vanadyl cation2. In tunicate tissues the chromogen, hsemo-vanadin, is a reducing substance containing trivalent vanadium complexed with sulphate and chelated with the amino groups of protein3. The reducing properties facilitate the detection of vanadium in electron-micrographs of tissues fixed in osmic acid. It has been suggested3 that the surfaces of blood cells bind vanadate that has entered the blood plasma without any selective absorption. My evidence pin-points the site of chelation in the blood cells and suggests selective adsorption of vanadyl ions.