Monogenic determinants of familial Alzheimer's disease: presenilin-2 mutations

Presenilin-2 (PS2) is one of three genes [amyloid precursor protein (APP), presenilin-1 (PS1) and PS2] shown to cause familial Alzheimer's disease (FAD), and is highly homologous to PS1. Currently demonstrated functions of PS2 include interactions with APP and Aβ, and participation in apoptotic pathways. PS2 FAD mutations influence APP processing in a manner predicted to promote amyloid formation and also enhance the proapoptotic effect of wild-type PS2. Other possible functions of PS2 are related to its homology to Notch pathway genes in Caenorhabditis elegans, suggesting it may have a developmental role. PS2-associated AD is the most reminiscent of the sporadic form of the disease in terms of older age of onset and longer disease duration. Since PS2 mutations are incompletely penetrant and age of onset in carriers is highly variable (40 – 88 years), elucidation of PS2 mechanisms may reveal factors which modify AD and are therapeutically relevant to sporadic AD.     

光解催化光度法测定药品VB12中钴的含量

本文提出了在CO(Ⅱ )的催化下 ,草酸铁钾的光解反应产物Fe(Ⅱ )与邻菲 口罗 啉生成的桔红色络合物的吸光度在一定的实验条件下与试CO(Ⅱ )的含量 0 2～ 2 .8(μg/ml)呈良好的线性关系 ,从而建立了一种的光化学———动力学测定钴的方法 ,本法灵敏度高 ,选择性好 ,用于药品VB1 2 中钴含量的测定 ,结果满意     

TiSiW_(12)O_(40)/TiO_2复相催化合成己酸乙脂的研究

介绍了以固载杂多酸盐TiSiW12／TiO2为复相催化剂，由己酸、乙醇为原料催化合成乙酸乙酯的方法，讨论了催化酯化的各种影响因素及反应机理，找出了反应的最佳条件。     

TiSiW12O40／TiO2催化合成苯甲酸丙酯

首次报道了以固载杂多酸盐TiSiW12O40/TiO2为多相催化剂，对以苯甲酸和丙醇为原料合成苯甲酸丙酯的反应条件进行了研究。实验表明：TiSiW12O40/TiO2是合成苯甲酸丙酯的良好催化剂，最佳反应条件为：醇酸摩尔比为4：1，催化剂用量为反应物料总量的1.5%，反应时间为2.5h。上述条件下，苯甲酸丙酯的产率可达70.5%。     

光合细菌-膜生物反应器处理VB12废水的研究

利用光合细菌-膜生物反应器对VB12废水进行处理,经历了反应器的启动和试运行阶段后,对曝气量、水力停留时间、光合细菌菌种强弱、进水COD质量浓度4个影响因素进行了分析。结果显示:水力停留时间为35 h,试验温度为30℃左右,pH值为6~8,溶解氧质量浓度控制在0.5~1.0 mg/L范围内,COD去除率可达到90%以上。     

TiSiW_(12)O_(40)/TiO_2催化合成丁酸正丙酯

首次以固载杂多酸盐 Ti Si W12 O4 0 / Ti O2 为多相催化剂 ,通过正丁酸和正丙醇反应合成了丁酸正丙酯 ,并探讨了诸因素对酯化率的影响。实验表明 :Ti Si W12 O4 0 / Ti O2 具有良好的催化活性 ,醇酸物质量之比为 1 .4∶ 1 ,催化剂用量为反应物料总量的 2 .0 % ,反应时间 2 .0 h,反应温度 1 0 6～ 1 1 2℃ ,酯化率可达 98.3 %。     

Effect of mutation in ribosomal protein on translation elongation

Translation accuracy, translation elongation rate and translation processivity are three important parameters for each elongation cycle. To study the role of ribosomal protein in translation elongation, these parameters were measured simultaneously for the first time in threeEscherichia coli T83 mutantsrpsL, rplX andrpmA. The results suggested that the mutants of ribosomal protein S12(rpsL) and ribosomal protein L24(rplX) decreased the processivity of ribosome while the mutant of ribosomal protein L27(rpmA) had little effect on the processivity;rplX mutant andrpmA mutant had higher accuracy; the elongation rate ofrplX mutant was faster than that of the wild type, whereas the elongation rate ofrpmA mutant was the same as that of the wild type.     

蛋白质微秒级折叠过程的快速模拟

使用ff12SB力场和广义玻恩(GB Neck2)隐性水模型在GTX670 GPU上对4个蛋白质CLN025 (2ZEI)、MHA6(2I9M)、Trp Cage (1L2Y)、Villin (3TRW)的微秒级折叠过程进行了分子动力学模拟,2ZEI的折叠时间和均方根偏差为5.94 μs和0.897 ,2I9M的折叠时间和均方根偏差为0.191 μs和1.142 ,Villin的折叠时间和均方根偏差为4.23 μs和1.37 ,Trp Cage的折叠时间和均方根偏差为2.48 μs和0.63 。结果表明,蛋白质折叠模拟已经能够通过GPU计算在桌面计算机上实现。     

溴代脱氢松香酸结构和构象的NMR研究

用二维核磁共振波谱技术研究了12-溴代脱氢松香酸的立体结构和溶液构象,并对其一维谱进行了归属．结果显示12-溴代脱氢松香酸立体结构具备天然脱氢松香酸及其12-位取代化合物的骨架分子构型的一般特征．