涿鹿柳蒿中氨基酸含量的测定

目的：建立柳蒿中氨基酸含量测定的高效液相色谱方法,并测定柳蒿中氨基酸的含量。方法：Hy—persil AAA-ODS色谱柱（2．1mm×150mm5μm）,采用梯度洗脱,检测波长330nm,柱温40℃。结果：线性范围：12．5-50pmoL·μL,平均回收率：96．2％～104．6％。结论：该方法快捷、稳定、重复性好,可用于柳蒿中氨基酸的含量测定。     

Relation of uric acid levels to aortic root dilatation in hypertensive patients with and without metabolic syndrome

Objective:Uric acid(UA) is considered to be a powerful predictor of cardiovascular risk and hyperuricemia might be involved in the metabolic syndrome(MS).This study aims to investigate the relation between UA levels and aortic root dilatation.Methods:A total of 348 hypertensive patients [age(67.5±9.8) years] with or without MS were included in the study.The aortic root diameters at the aortic annulus,the sinuses of Valsalva,the sinotubular junction,and the proximal part of the ascending aorta were measured using a two-dimensional(2D) echocardiography.Serum UA levels were also measured for all patients.Results:A high UA level is independently associated with aortic root diameters at the sinuses of Valsalva(P=0.001) and the proximal ascending aorta(P0.0001) in the hypertensive patients without MS.In contrast,aortic root diameters were not significantly related to UA levels in the hypertensive patients with MS.Furthermore,increased UA levels were associated with an increased risk for aortic root dilatation in the patients without MS(sex-adjusted hazard ratio 1.75,95% confidence intervals(CI) 1.27-2.41),but not in those with MS.Conclusions:This study demonstrated an independent relationship between the aortic root dimensions and increased levels of serum UA in the hypertensive patients without MS.Further understanding of the mechanisms underlying these associations may allow a clearer interpretation of the potential value of specific urate-lowering treatment on cardiovascular disease.     

福建海西城市生活固体废弃物物流研究

随着国民经济的发展和城市化进程的加速,城市生活固体废弃物也在飞速地增多,对环境的影响也逐渐加深,城市生活固体废弃物物流已成为现代城市发展不可缺少的要素。以福建海西城市为研究对象,对城市生活固体废弃物及其物流特性进行了研究,分析我国发展海西城市生活固体废弃物物流的必要性,进而形成海西城市生活固体废弃物物流建议就非常必要。     

铂微粒修饰碳纳米管-纳米TiO2/聚苯胺复合膜电极对抗坏血酸的电催化氧化

采用循环伏安法,在含有0.2mol.L-1苯胺的0.5 mol.L-1的硫酸溶液中,以50mv.s-1的扫描速度,在-0.1~0.9V范围内实现苯胺在碳纳米管-纳米TiO2膜电极上的电化学聚合,得到翠绿色的聚苯胺膜,并用交流阻抗谱对复合膜的电化学性质进行了表征。在该电极上修饰铂,制得铂微粒修饰聚苯胺复合膜电极,研究了其对抗坏血酸的电催化氧化,发现修饰后的电极对抗坏血酸的氧化有很高的催化活性。     

柠檬酸对土壤磷释放与吸附的影响

本文研究了柠檬酸对土壤磷释放和吸附的影响。结果表明:柠檬酸对土壤磷素的释放有促进作用,土壤磷释放量与柠檬酸浓度之间的关系可用数学模型定量表示。在柠檬酸浓度较低时,外源加入磷量对平衡液中磷浓度起主导控制;当柠檬酸浓度较高时,柠檬酸起主导作用。柠檬酸处理后,平衡液中磷含量与土壤磷吸附量之间可以用肥力—产量模型来表示。     

枇杷叶中三萜酸的提取、分离和检测研究进展

枇杷叶是一种传统的中药植物资源,富含熊果酸、齐墩果酸、科罗索酸等多种三萜酸类化合物,具有较高的应用价值。本文对枇杷叶中三萜酸的种类、提取、分离、检测和生物活性进行了综述。     

辛二酰氯的合成及其理论计算

以辛二酸为原料,经酰化反应合成得到辛二酰氯,考察了反应时间和反应温度对产物产率的影响,并借助密度泛函量子力学程序对反应前后产物空间结构的变化进行研究.实验结果显示：反应时间24 h,反应温度80℃,辛二酰氯产率为94.7﹪;结构优化后的辛二酰氯HOMO与LUMO轨道上的电子密度下降,且向亚甲基方向偏移.     

山梨酸乙酯的合成研究

以对甲苯磺酸为催化剂,催化合成山梨酸乙酯。考察了原料配比、催化剂的用量、带水剂的用量以及反应时间等条件对反应的影响。实验结果表明,合成山梨酸乙酯的最佳反应条件是：n（山梨酸）：n（乙醇）=1：5,催化剂用量占山梨酸质量的25％,反应时间3h,带水剂用量为15mL,产物收率75．04％,纯度达98％。     

Assessing the effectiveness of learning solid geometry by using an augmented reality-assisted learning system

This study integrates augmented reality (AR) technology into teaching activities to design a learning system that assists junior high-school students in learning solid geometry. The following issues are addressed: (1) the relationship between achievements in mathematics and performance in spatial perception; (2) whether system-assisted learning can improve the spatial perceptions of students; (3) whether students with high, average and low academic achievement learn effectively after taught with system assistance; (4) system usability; (5) system task load; and (6) the relationship among various factors. Study participants were 76 students from Tainan City, Taiwan. Qualitative and quantitative data are obtained using pre- and post-system-assisted learning paper–pencil tests, a system usability scale, National Aeronautics & Space Administration Task Load indeX, and observations and focus group interviews. Analysis results indicate that students' math scores and spatial perception during the test closely correspond to each other. Additionally, system-assisted can improve the spatial perceptions of student. Regarding group differences related to the significance of impact, students with average and low academic achievements exhibit small and medium levels of effectiveness, but are insignificant in high academic achievement students. As for system usability, students with low academic achievements demonstrate a positive attitude toward the intensive programs provided by the system. However, the correlation between students’ learning effectiveness and system usability/task load is low.     

凉州熏醋大曲中细菌区系研究

研究了凉州熏醋传统酿造大曲中细菌区系,对大曲中的细菌总数、醋酸菌、乳酸菌及耐热菌进行计数、分离纯化和鉴定,通过显微镜镜检、革兰氏染色、接触酶反应、需氧型、产酸产气、发酵性等特性测定,对分离的菌株进行了具体菌属鉴定.结果表明,大曲表面与大曲中心细菌区系差异明显;大曲中共分离到5株醋酸菌、8株乳酸菌和4株耐热菌;醋酸菌分属为醋杆菌属和葡糖杆菌属;乳酸菌分属为糖球菌属、链球菌属、魏斯氏菌属、乳球菌属和索丝菌属;耐热菌分属为微球菌属和芽孢杆菌属.