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酶解法提高松针黄酮抗氧化性能试验（Experiment on Enzymatic Hydrolysis to Improve in Vitro Anti-oxidative Activity of Pine Needle Flavonoids）
松针黄酮 抗氧化性能 酶法修饰
2009/8/11
研究了松针总黄酮(PNF）的抗氧化性能和酶法修饰提高PNF抗氧化性能的条件。结果发现，PNF的体外抗氧化性能很强，DPPH自由基清除效果与抗坏血酸相似，羟基自由基、超氧阴离子清除率分别约为抗坏血酸清除率的4倍、2倍，Fe3+还原能力的EC50约为抗坏血酸EC50的1/2.8。用β-葡萄糖苷酶对PNF进行酶解修饰，其最优工艺参数为：酶解温度40℃，酶添加量1/1000，底物质量浓度0.6g/L，酶解...
CFD Modeling to Improve the Design of a Fog System for Cooling Greenhouses
fog-cooling system glasshouse natural ventilation wind speed
2009/6/10
A CFD model was developed to simulate the air temperature and relative humidity distribution in greenhouses adopting fog-cooling systems using FLUENT. The developed model was validated using the data ...