Mg-calcite, a carbonate mineral, constitutes Ca precipitates produced as a byproduct of osmoregulation in the intestine of seawater-acclimated Japanese eel Anguilla japonica
Mg-calcite, a carbonate mineral, constitutes Ca precipitates produced as a byproduct of osmoregulation in the intestine of seawater-acclimated Japanese eel Anguilla japonica
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DOI：
10.1007/s12562-009-0199-5
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发表时间：
2010-03-01
影响因子：
1.9
通讯作者：
Kaneko, Toyoji
中科院分区：
文献类型：
--
作者：
Mekuchi, Miyuki;Hatta, Tamao;Kaneko, Toyoji
已知海洋硬骨鱼产生白色粪便，其通常被称为Ca沉淀物。钙沉淀物被认为是钙调节的产物。在本研究中，我们研究了钙沉淀的物理化学性质，并可能参与钙沉淀的形成在hyposmodregulatory过程中的海水驯化日本鳗鱼。而钙沉淀物不产生在鳗鱼适应淡水，钙沉淀物被视为鳗鱼适应海水中的盐度依赖性的方式。根据X射线衍射分析，钙沉淀物是碳酸盐矿物：镁方解石和它的无定形物的混合物。定量分析表明，Ca和Mg之间的摩尔比约为7：2。在低Ca（2+）或低Mg（2+）海水中，Ca沉淀物的形成量减少，表明Ca沉淀物中的Ca和Mg来源于海水。
Marine teleosts are known to produce white feces, which is often referred to as Ca precipitates. Ca precipitates have been suggested to be a product of osmoregulation. In the present study, we examined the physicochemical nature of Ca precipitates, and possible involvement of Ca precipitate formation in hyposmoregulatory processes in seawater-acclimated Japanese eel. Whereas Ca precipitates were not produced in eel acclimated to freshwater, Ca precipitates were seen in eel acclimated to seawater in a salinity-dependent manner. According to X-ray diffraction analysis, Ca precipitates were a mixture of carbonate minerals: Mg-calcite and its amorphia. Quantitative analysis showed that the molar ratio between Ca and Mg was approximately 7:2. Ca precipitate formation was reduced in eel exposed to low-Ca(2+) or low-Mg(2+) seawater, indicating that Ca and Mg in Ca precipitates were derived from seawater.