Comparative physio-chemical study on environmental tolerance of Corbicula japonica

对1993年1月至1994年11月在岛根县真次湖逐月采集的苦咸水蛤（Corbicula japonica）的总组织中提取成分和生物化学成分进行了分析。水分、蛋白质、脂质含量一年四季变化不大，糖原含量一年四季变化较大。2 ~ 6月糖原含量较高。蛤含有丰富的游离氨基酸，尤其是丙氨酸和谷氨酸。大多数氨基酸和提取氮没有明显的季节变化。在高渗条件下，所研究的软体中丙氨酸、谷氨酸、甘氨酸、脯氨酸和β -丙氨酸的含量明显增加，表明这些含氮成分在细胞内渗透调节中起着重要作用。

Comparative physio-chemical study on environmental tolerance of Corbicula japonicaBiochemical composition, Extractive components in the total tissues of brackish water clam Corbicula japonica were analyzed on the specimens collected monthly from January 1993 to November 1994 at Lake Shinji, Shimane Prefecture.The seasonal variation throughout the year in the contents of moisture, protein, lipid is small, while that of glycogen is large. The content of glycogen was high from February to June.The clam were rich in free amino acids, especially in alanine and glutamic acid. Most amino acids as well as extractive nitrogen did not show a marked seasonal variation. The increase in alanine, glutamic acid, glycine, proline, and beta-alanine under hyperosmotic condition were noticeable in the soft bodies studied, suggesting that these nitrogenous components play a significant role in intracellular osmoregulation.