Effects of traces of rare earth elements on the protozoanBlepherisma and on mice |
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Authors: | Wei de Zhang Fan Qing Li Xiao Yun Zhang Ying Chen |
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Institution: | (1) Center of Structure and Element Analysis, University of Science and Technology of China (USTC), 230029 Hefei, Anhui, China;(2) Department of Biology, University of Science and Technology of China (USTC), 230029 Hefei, Anhui, China |
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Abstract: | The growth of the protozoanBlepherisma is stimulated by Lanthanum (La) at concentrations as low as 0.32 ppm. In mice Yttrium (Y) and Ytterbium (Yb) are absorbed,
accumulated, and metabolized. Both rare earth elements (RE) exhibit a high affinity for teeth and bones, accumulation occurs
and metabolism is slow. In the livers of RE-exposed mice, concentrations are variable. The liver is apparently capable of
absorbing and discharging RE in a manner depending on metabolic activity. The main route of discharge for ingested REs is
the alimentary canal. Exposure of pregnant mice to RE leads to rapid placental transfer of RE; 14.1% of the total amount of
RE administered was detected in newborn mice. Young, developing organisms appear to be especially susceptible to RE accumulation. |
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Keywords: | Mice Blepherisma trace elements in metabolism growth effect on Lanthanum Yttrium Ytterbium |
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