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The effects of degraded porphyran (P1) and natural porphyran (P) on the lifespan and vitality of Drosophila melanogaster are studied. The porphyrans, added daily to the food medium at 0.2% and 1% concentrations, can significantly increase the lifespan in average of 55.79 and 58.23 d in 0.2% P1 diet females and 1% P1 diet males, extending by 12.29% and 8.60% over the corresponding controls, respectively. The effects of porphyrans on D. melanogaster in heat-stress condition were also examined, and found a remarkable increase in survival time. The results which are consistently associated with the use of porphyrans are related to their free radical scavenger action. Considerable increase in vitality demonstrated that vitalities of middle-aged fly (assessed by measuring their mating capacity) was observed after porphyrans addition. Therefore, porphyrans are effective in reducing the rate of aging, and P1 in low molecular weight is better than natural P. 相似文献
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海洋新药FPS是一种水溶性杂聚多糖(是褐藻的特有组分)。它在医学方面有其独特的功效,具有抗凝血、降血脂、重金属解毒、抑制白细胞的生长和抗HIV的作用。并能代替肝素,引起了许多海洋科学工作者的高度重视,成为天然海洋药物的主攻方向。目前仅有少数几个国家研究它的化学组分、结构、理化特性、制备方法及其在医学上的作用。由于含量低,单一提取,工艺繁杂,价格昂贵,至今未能制成药品,仍停留在生物实验阶段。作者对褐藻的特有组分FPS的有效部位,典型分子结构、生产工艺、主要药效、部分毒理及前期临床进行了一系列的研究… 相似文献
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江蓠琼胶产率、物理性质和化学组成的季节变化 总被引:4,自引:0,他引:4
六十年代以前,我国主要用石花菜作琼胶原料,为弥补石花菜资源的不足,我们开展了用江蓠制造琼胶的研究,并取得了成功,使江蓠也成了制造琼胶的良好原料。但是,由于江蓠的种类、生长环境和采集季节等的不同,所含琼胶的数量及其物理化学性质变化很大,有的产琼胶率高、质量好,有的则很差。1946年美国的DeLoach分析了江蓠(G.verrucosa)的琼胶产率和凝胶强度的季节变化。其后,John等人研究了加纳齿江蓠(G.dentata)。Hoyle研究了夏威夷的脆江蓠(G.bursapastoris)和伞房江蓠(G.coronpifolia)的琼胶产率和凝胶强度的季节变化。Oza除测定了印度的皮江蓠(G.corticata) 相似文献