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A pair of kidney of Cyclosunetta menstrualis
is situated beside the posterior adductor muscle. Separation of the kidney
from other tissues is very easy bｅcause of its dark brown color. Extracellular granules of various sizes and shapes are present in the kidney lumen. The Mn concentration in the kidney granules of C. menstrulalis was ten times higher than those in the kidney granules of Tridacna squamosa. It was found from XAFS analysis of the granules isolated from the kidney tissues that Mn existed in the chemical form of Mn3(PO4)2･xH2O. |
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The concentration of Mn in kidneys of T.
squamosa and C. menstrualis is ca. 100 times higher than
that of other species of marine bivalves. The presence of Mn-rich granules
is related to the enhancement of Mn content in the kidneys . |
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It was found that the local structue of Mn
in the kidney of Tridacna group and C. menstrualis show
a distored coordination structure since the distance of the Mn atom to
4 oxygen atoms is not equal to the distance of the Mn atom to 2 oxygen
atoms. |
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It is usual that intracellular and extracellular granules are formed
in tissues of organisms. I think that there is no biological significance of the kidney granules of Tridacna group and C. menstualis SEM=scanning electron microscopy |
｜High accumulation of metals by Bryopsis maxima｜High accumulation of vanadium by a fan worm Pseudopotamilla occelata｜
｜ High accumulation of manganese by a giant clam Tridacna squamosa｜
｜High accumulation of manganese by a marine bivalve Cyclosunetta menstrualis｜High accumulaton of iodine by a strawberry conch shell Strombus luhuanus｜
｜ High accumulation of iron by teeth of mollusks｜High accumulation of metals by an octopus Octopus vulgaris｜
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