Comparative physio-chemical study on environmental tolerance of Corbicula japonica

对岛根县神积湖1993年1月至1994年11月采集的微咸水贝体总组织的生化组成、提取物成分进行了分析。水分、蛋白质、脂肪含量全年季节变化较小，而糖原含量则较大。2~6月糖原含量较高，游离氨基酸含量丰富，其中丙氨酸和谷氨酸含量最高。大部分氨基酸和提取态氮没有表现出明显的季节变化。在所研究的软体中，丙氨酸、谷氨酸、甘氨酸、脯氨酸和β-丙氨酸在高渗条件下显著增加，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.