Reduction of aflatoxin B1 with zinc borohydride: An efficient preparation of aflatoxicol

Summary A simple and mild reduction of aflatoxin B₁, involving treatment of aflatoxin B₁ with ethereal zinc borohydride to give 57–65% yield of diastereomeric aflatoxicols, is described.This work was supported by the College of Agricultural and Life Sciences, the University of Wisconsin, Madison, and by Public Health Service Research, grant No. CA 15064, from the National Cancer Institute, and by funds from contributions of food industries to the Food Research Institute. We are grateful to Professor Dennis Hsieh for a gift of natural aflatoxicol, to Mr William Harder for technical assistance throughout this investigation, and to Mr Gary Girdaukas for taking mass spectra.     

Antiinflammatory reaction associated with murine L1210 leukemia

Summary Mice bearing L1210 leukemia did not show impaired humoral or cellular immune response to antigenic stimulation during the early stage of the tumor, and a depressed response was noted only in the terminal stage. L1210 cells were shown to suppress inflammatory reaction in vivo.Supported in part by USPHS research grant No.5-01-RR05-352-12, and by theIndependent Order of Foresters, San Bernardino District 3208. We acknowledge the valuable assistance ofJudith Johnson andJames Tan in this project. Histopathological examination byDick H. Koobs is appreciated.     

应用于WLAN/WiMAX的小型化全向三频天线

提出了一种新型的三频天线,该天线可同时工作在WLAN(2.45 GHz,5.15-5.85 GHz) 和WiMAX(3.5 GHz)三个频段,在相应的工作频段内回波损耗小于-10dB。此天线实现了高度仅10mm,宽度仅13mm的小型化设计。天线在其H面实现了全向辐射,适合移动环境中使用.     

Confirmation of pelitic granulite in the Altai orogen and its geological significance

The existence of pelitic granulite in the Altai orogen was confirmed for the first time by detailed petrographic research and P-Tpseudosection modeling. The pelitic granulite has the assemblage of garnet ＋ cordierite ＋ K-feldspar ＋ biotite ＋ sillimanite ＋ plagioclase ＋ quartz with some samples containing the paragenesis of cordierite ＋ spinel. Peak conditions of the pelitic granuUte determined from the P-T pseudosection involved P = 0.5-0.6 GPa, T= 780-800℃ belonging to medium- to low-pressure type. SHRIMP U-Pb dating of zircon presented a metamorphic age of 292.8 ± 2.3 Ma. The discovery of pelitic granulite reflects an extensional environment with high heat flow in the southern margin of the Altai orogen during the Early Permian, which provides an important petrological constraint on the evolution of the Altai orogen.     

催化湿式氧化BIPB化工废水滴流床反应器系统建立

为经济有效地降解高质量浓度化工有机废水,采用连续式固定床反应器进行催化湿式氧化处理,操作运行处于滴流区域.制备的锰铈复合氧化物负载型催化剂具有良好的活性和稳定性,将废水TOC去除率提高20个百分点以上,连续运行50 h催化剂仍维持较好的反应活性,其活性组分抗反应溶出性能优异.较小空时(9.43 min)时废水已得到较好处理,进一步增大空时对提高废水处理效果并不明显.催化湿式氧化处理不同质量浓度有机废水具有较好的适应性,高质量浓度废水未对反应系统产生明显的抑制.     

3—苯基偶氮—5—磺基水杨酸与钕（Ⅲ）,铜（Ⅱ）络合物的合成与表征

在ｐＨ＝３．８酸性条件下合成了３－苯基偶氮－５－磺基水杨酸与Ｎｄ（Ⅲ）的酸式络合物，在弱碱性条件下合成了该染料与Ｎｄ（Ⅲ）的羟式络合物及Ｃｕ（Ⅱ）的络合物，对这些络合物进行了元素分析、热重分析，并测定了电导和红外光谱，确定了分子式，讨论了可能的配位环境。Ｎｄ（Ⅲ）的络合物中奶均以二齿形式配位，偶氮基皆未参与配位，羧式络合物中酚基则参与配位。在Ｃｕ（Ⅱ）的络合物，羧酸根以二齿形式配位，酚基，偶氮基也     

具有非光滑边界的强拟凸多面体上的Koppelman-Leray-Norguet公式

得到了Ｃ＾ｎ空间中具有非光滑边界的强拟凸多面体上微分形式的Ｋｏｐｐｅｌｍａｎ－Ｌｅｒａｔｙ－Ｎｏｒｇｕｅｔ公式及其δ－方程的连续解，其特点是不含有边界积分，从而避免了边界积分的复杂估计。     

电感耦合等离子体质谱法测定高纯气体中痕量铝、磷、硼

研究了用电感耦合等离子体质谱（ICP—MS）测定高纯气体五氟乙烷中铝、磷、硼等杂质的分析方法．在最佳仪器条件下，通过选择合适的吸收液与测定同位素、采用Sc作为内标以及碰撞池技术，避免了基体效应以及多原子离子对测定的干扰．方法简单、灵敏度高，对高纯气体的质量监控有指导意义．     

全国农运会对举办地产生的效应分析

体育赛事对举办城市产生的效应主要包括:体育赛事对举办地体育、社会、文化、自然环境、旅游和经济发展等。分析了近三届全国农运会对举办城市产生的效应,为农运会的健康可持续发展提供重要依据。     

Immobilization of 12-phosphotungstic heteropolyacid on amine-functionalized SiO<Subscript>2</Subscript> for tetrahydrofuran polymerization

The 12-phosphotungstic heteropolyacid (HPW) was immobilized on the surface of a silica carrier modified by the amine groups of organosilane γ-aminopropyl triethoxysilane (APTES), and its catalytic performance was investigated for tetrahydrofuran (THF) ring-opening polymerization. This amine-functionalized catalyst exhibited better activity, and the polytetramethylene ether glycol (PTMG) yield was 63.7%. The 12-phosphotungstic heteropolyacid supported on aminopropyl-functionalized SiO₂ support (HPW/SiO₂-APTES) was reused four times and showed a good maintenance of activity which was better than that of the conven-tional catalyst HPW supported on SiO₂ (HPW/SiO₂). These results were obtained using infrared spectroscopy, nuclear magnetic resonance spectroscopy, nitrogen adsorption and X-ray diffraction. HPW on the HPW/SiO₂-APTES catalyst exhibited higher dispersed state and maintained a more stable structure than that of the HPW/SiO₂ sample.