The effect of cell density on the production of xylitol fromd-xylose by yeast

The rate of xylitol production from D-xylose increased with increasing yeast cell density. The optimal temperature for xylitol production is 36‡ C, and the optimal pH range is from 4.0 to 6.0. At high initial yeast cell concentration of 26 mg/mL, 210 g/L of xylitol was produced from 260 g/L of D-xylose after 96 h of incubation with an indicated yield of 81% of the theoretical value.     

超临界流体色谱法分离二十碳五烯酸和二十二碳六烯酸

以二氧化碳单一作流动相,ODS柱为固定相,用超临界流体色谱法分离了二十碳五烯酸（EPA）和二十二碳六烯酸（DHA）,考察了操作温度和压力对容量因子（k′）和分离度（R）的影响,并根据EPA和DHA在超临界二氧化碳中溶解度的变化规律,对实验结果做了定性的解释。     

聚氨酯-接枝-磺化聚氧乙烯的合成及其血液相容性研究

通过梳状的磺化聚氧乙烯接枝共聚醚和４,４’ 二苯甲烷二异氰酸酯（ＭＤＩ）反应,合成了磺酸根离子和聚氧乙烯复合修饰的聚氨酯（ＰＥＵ ｇ ＰＥＯ ＳＯ３Ｎａ）．通过血小板粘附试验对材料的体外抗凝血性试验表明将具有“类肝素”生物活性的磺酸根离子通过ＰＥＯ为“间隔臂”固定在聚醚氨酯上,不仅可以有效地阻抗血小板的粘附、活化,还可以有效地阻断内外源凝血途径,具有较好的血液相容性．     

Construction of a Turn-off–on Fluorescent System Based On Aggregation Induced Emission of Acetaldehyde Using Carbonized Polymer dots and Tb3+

Journal of Fluorescence - It was the first time to report the aggregation induced emission (AIE) of acetaldehyde (AA) on the surface of carbonized polymer dots (CPDs) with the auxiliary of Tb3+....