ICP-AES比较临床分离药物敏感和耐药结核分枝杆菌的金属离子

利用现在多元素痕量分析最重要的方法——电感耦合等离子体原子发射光谱(ICP—AES)分析结核分枝杆菌中的金属离子的种类和含量,结果表明,Cr^3 ,Al^3 ,Ca^2 ,Fe^2 ,Mn^2 ,Co^2 ,Cu^2 ,Ni^2 的含量较高,并发现药物敏感菌株和耐药菌株之间在金属离子种类和含量上有明显区别．这种差异在耐药中的意义有待进一步研究．     

Coupling and feedback between iron and sulphur in air-sea exchange

Iron in surface seawater has been demonstrated to be the limiting nutrient factor for primary productivity in certain oceanic regions where other major nutrients are abundant[1—5]. The available Fe to the phytoplankton in seawater is related to the uptake of carbon dioxide through the ocean and, in turn, to the global greenhouse effect[6—11]. Recent reports showed that the available Fe in the seawater is closely correlative to nitrogen fixation in the ocean[12—17]. Understanding which Fe s…     

VB中绘制虚线元素应注意的问题

Visual BASIC提供了丰富的绘图属性和方法,可方便地绘制各种图形,但在利用Draw Style属性绘制虚线元素时,会遇到当线宽属性DrawWidth>1时,不支持线型与虚线不完整的现象.通过编写程序可以较好地解决这些问题.     

Elemental composition of aerosols collected in the glacier area on Nyainqêntanglha Range, Tibetan Plateau, during summer monsoon season

In order to investigate the elemental composition in atmospheric aerosols and its sources in the glacier area over the Tibetan Plateau (TP), seven totally suspended particle samples were collected continuously at the col of the Zhadang glacier (30°28′N,90°39′E,5800 m a.s.l.), Nyainqêntanglha Range, southern TP, from June to October 2006. Twenty-seven elements (Li, Be, B, Na, Mg, Al, K, Ca, Sc, Ti, V, Fe, Mn, Zn, Ga, As, Rb, Sr, Y, Cd, Cs, Ba, Tl, Pb, Bi, Th, U) were analyzed by Inductively Coupled Plasma Mass Spectrometry (ICP-MS). The result indicates that the concentrations of most elements (especially crustal elements) are lower than values at the Nam Co Station during the same period of 2005, and also much lower than other sites in the TP such as Wudaoliang and Waliguan. This suggests that elemental compositions of aerosols in the Zhadang glacier area may represent the background levels of the middle/upper troposphere over the TP. Crustal enrichment factors (EFs) reveal that several elements (e.g. B, Zn, As, Cd, Pb and Bi) may have anthropogenic sources. The southern TP is mainly influenced by the summer Indian monsoon during the sampling period. Backward air mass trajectory analysis suggests that air masses in the region may originate from South Asia. Therefore, anthropogenic pollutants from South Asia may be transported by the summer Indian monsoon to the region which clearly affects the atmospheric environment in the southern TP during the summer monsoon season.     

XML信息的加密及实现

简述了XML在跨平台分布式中的应用（数据交换），分析了XML加密的必要性和特点，详细阐述了XML加密信息的原理和类型，最后探讨了XML加密技术在Visual Studi．NET2005下的实现。     

荧光试剂衍生化液相色谱分析生物检材中的氟乙酸钠

建立了使用新的荧光衍生试剂9-氯甲基蒽(CA)衍生化生物检材中的氟乙酸钠,并通过薄层色谱和荧光检测的高效液相色谱(HPLC)分析的方法。合成得到氟乙酸钠的荧光衍生物——氟乙酸-9-亚甲基蒽酯(MA-MFA),纯度达到98%以上,通过红外光谱、核磁共振、元素分析和质谱对其进行结构表征。薄层色谱中展开剂为石油醚/乙酸乙酯(体积比为95∶5),检测限为5×10-8g(TLC)。高效液相色谱用AgilentHypersilODS反相色谱柱,以乙腈/水(体积比为85∶15)为流动相,荧光检测波长λex为256 nm,λem为412 nm。方法在2.5×10-9~125×10-9mol/mL浓度范围内呈良好的线性关系,线性相关系数为0.9988,生物样品空白添加实验的回收率为83%~90%,最低检测限为2×10-10g(S/N=3),日内、日间RSD均小于4%。该方法用于中毒死亡者的血液样品及其他检材的测定,效果良好。     

矩阵Hadamard乘积的一些性质

研究了矩阵Hadamard乘积的元素和的性质,得到一系列新的结果.发现两个矩阵不同,是因为它们之间存在夹角和大小的差异.找到了矩阵垂直的充要条件,矩阵Hadamard乘积的元素和与此矩阵的行列式的关系。     

N-(5-三氟甲基-1,3,4-噻二唑-2-基)-N''-芳氧乙酰基硫脲的合成及其生物活性

通过2-氨基-5-三氟甲基.1,3,4-噻二唑与芳氧乙酰基异硫氰酸酯反应,合成了9个新的芳氧乙酰基硫脲,其结构用红外光谱、核磁共振氢谱和元素分析确证.初步的生物活性测试试验表明,部分目标化合物具有良好的植物生长调节活性,其中3b、3e、3i的生长素活性优良,3d、3e的细胞分裂素活性较好.三氟甲基增进了目标化合物的生物活性.     

煤的变质程度与煤层吸附CO影响的实验研究

针对近期许多中一低变质程度的煤层出现CO长期超标，但煤层未曾出现自然发火的现象，进行了煤的变质程度对吸附CO影响的实验研究。通过测定煤的工业分析、元素分析、煤岩组分数据及其在30℃下对CO的等温吸附数据，利用Mathematic软件对实验数据进行了分析处理，得出在不同压力下，中一低变质程度的煤层对CO吸附量最大，为进一步研究煤层中一氧化碳赋存机理提供了依据，进而可减少不必要的自然发火预防措施的实施．     

3,3''''-二羟基4,4''''-联苯二甲酸的合成和表征

联苯二甲酸类化合物是很好的刚性桥联配体,可用于制备纳米多孔材料.设计了一条制备联苯二甲酸类新配体的合成路线,以4氨基水杨酸为原料,经过4步反应最终合成了新配体3,3'-二羟基4,4'-联苯二甲酸,并通过红外光谱、核磁共振氢谱和元素分析进行了表征.