淮河流域行蓄洪区居民生产生活条件分析

淮河行蓄洪区的建设基本解决了区内居民的人身安全问题，居民的生产生活条件取得了明显改善。然而，“以跑为主”仍是行蓄洪区内大部分群众防洪避险的首要选择，区内居民的生产生活条件明显不如区外，“人水争地”是造成行蓄洪区内居民生产生活条件落后的根本原因，对各行蓄洪区进行不同的战略定位和管理是区内居民生产生活条件改善的前提条件，实现人口控制和人口转移是区内居民生产生活条件改善的关键。

20世纪末安徽省扶贫开发的历史回顾及重要成就

安徽农村扶贫开发的历史进程归纳起来可分为 4个阶段 :救济式扶贫阶段 (建国～1 977年 ) ;体制改革推动脱贫阶段 (1 978～ 1 985年 ) ;有计划、有组织大规模的开发式扶贫阶段 (1 986～1 993年 ) ;“八七”扶贫攻坚阶段 (1 994～2 0 0 0年)。自 80年代中期有计划、有组织、大规模的开发式扶贫开始 ,特别是“八七”扶贫攻坚的 7年间 ,安徽省扶贫资金投入大幅度增加 ,贫困人口逐年减少 ,贫困县农民收入显著提高 ,贫困地区基本生产生活条件明显改善 ,为促进全省经济发展。

Effects of nutrient profiles and light regime on the production of exopolysaccharide by Porphyridium cruentum

In order to increase the yield of polysaccharides from Porphyridium cruentum and the cell biomass, we investigated several important cultural conditions such as nutrient-salts, light irradiance as well as growth conditions in the flat plate photobioreacturs （FPPBR） with different light-path. We have found that the optimal （OCM II ） was a superior medium for extracellular polysaccharide production than the f/2 and Koch medium, and the polysaccharide production with OCM II was increased by 1.79 times and 1.62 times compared with that of f/2 and Koch medium; the yields of polysaccharides were also improved by optimizing the light intensity and irradiation length Furthermore, we significantly enhanced the yields of both the biomass and extracellular polysaccharidc using a small light-path photobioreactor, and about 2.1 times increase of polysaccharide production was observed in FPPBR-30 than in FPPBR-100. Overall, the process for polysaccharides production was improved and this would facilitate further studies on such polysaccharidcs such as their antiviral and antitumor activities.