Electro-enhanced adsorption of As(V)by activated carbon in three-dimensional electrode reactor

This study focused on As(V)removal by electrosorption in a self-made three-dimensional electrode reactor,in which granular activated carbon(GAC)was used as the particle electrode.Under the optimal conditions,the removal efficiency of As(V)was 84%,and its residual concentration in solution was 0.08 mg/L.From kinetic investigation,the rate determining steps of the entire process may involve more than two processes:membrane diffusion,material diffusion and physical/chemical adsorption processes.During the desorption process,As(V)can be desorbed from GAC,and the GAC was able to electro-adsorb As(V)again after desorption,which means that the electrode has good cycling performance.

BQ-123对蛛网膜下腔出血大鼠神经功能的保护作用研究

目的探讨BQ-123对蛛网膜下腔出血(SAH)的治疗作用及其机制。方法 160只雄性SD大鼠,随机分为假手术(Sham)组、SAH组、雷帕霉素组、低剂量BQ-123组、高剂量BQ-123组。2次注血法复制SAH大鼠模型;光镜观察海马区形态结构变化;免疫组织化学法检测海马区雷帕霉素靶蛋白(mTOR)、自噬相关基因Beclin-1和微管相关蛋白1轻链(LC3)-Ⅱ的表达;实时逆转录聚合酶链反应(real-time RT-PCR)检测mTOR、Beclin-1和LC3的mRNA表达;抓力测定实验评价各时间点大鼠前肢拉力情况;穿梭箱实验测试动物的学习功能。结果与Sham组比较,SAH组海马区mTOR、Beclin-1和LC3 mRNA表达增加,存活神经元细胞数量减少,大鼠的学习功能和拉力值下降,差异有统计学意义(P<0.05);与SAH组比较,雷帕霉素组海马区mTOR mRNA表达降低、Beclin-1和LC3 mRNA表达增高,存活神经元细胞数量增多,大鼠的学习功能和拉力值改善,差异有统计学意义(P<0.05);与SAH组比较,BQ-123组海马区mTOR mRNA降低、Beclin-1和LC3 mRNA表达增高,存活神经元细胞数量增多,动物学习功能指标和拉力值改善,差异有统计学意义(P<0.05),且上述变化在高剂量BQ-123更为明显。结论 BQ-123可改善SAH大鼠神经功能缺陷,抑制mTOR激活,从而提高海马区神经细胞自噬程度。