Abstract:The digestive system of giant freshwater prawn (Macrobrachium rosenbergii)has been studied with light microscopic histology and scanning electron microscopy. It was found no any tooth in cardiac stomach, but there were cuticle plates in the dorsal and ventral wall of the stomach. The midgut is rather longer, from the post part of cephalothorax to the most part of abdominal region. The free ends of epithelium cells in midgut have striated borders, and cells directly contact with the lumen of the midgut. The striated borders also appear in the tubule cells of midgut gland. The hindgut is short, has no striated border. The epithelium cells of digestive tube with or without the striated border can be used as one of important standard for distinguishing the midgut from foregut and hindgut.

Abstract:本文描述了河川沙塘鳢胚胎、仔、稚鱼消化系统的发育过程，对仔、稚、幼鱼的摄食作了较深入的研究。仔鱼开口摄食期为孵化后的2－7天，第10天的仔鱼，卵黄方被完全吸收，属混合性营养类型，混合营养期为孵化后的2－9天。小型枝角类是仔鱼适宜的开口饵料；仔、稚鱼期的主要饵料亦为枝角类，其次为桡足类；幼鱼则转为以小蚯蚓和摇蚊等底栖动物为主要食物。从仔鱼到幼鱼，摄食量逐渐增大。稚鱼昼夜摄食节律变化明显。

Abstract:在本世纪末即将全面禁止使用CFCs。对于R11和R12的替代工质，例如R123和R134a的热力性质已有很多文章发表。本文给出了计算工质热力性质必须的全部公式，并编制了通用计算程序，用来计算R142b、R152a等替代工质的热力性质，所得结果与现有的工质性质图表所列数据吻合。