21 resultados para 80-549


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表面活性剂吐温-80对菲和芘生物降解的影响宋玉芳赵燕杨桂芬(中国科学院沈阳应用生态研究所,沈阳110015)我们通过室内模拟实验方法选择了表面活性剂吐温-80,研究其生物毒性及对菲,芘微生物活性和微生物降解的影响,土壤呼吸强度实验结果表明,当吐温-8...

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Endohedral metallofullerenes Ce@C-82, Ce-2@C-80, Nd@C-82 and Nd-2@C-80 undergo gas phase ion/molecule reactions with the ion system from self-chemical ionization of vinyl acetate, and exohedral derivatives are thus generated, A new heterocycle is formed from metallofullerenes and a C2H3O+ cation, Endohedral metallofullerenes show much higher reactivities than empty fullerenes during the association and the charge and proton transfer processes, The strong electron-donating character of endohedral metallofullerenes is due to their unique super-atom-like electronic structures. (C) 1997 by John Wiley & Sons, Ltd.

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本文提出了一个借钛-4,5-二溴苯基荧光酮(DBPF)-Tween-80与蛋白质显色反应光度测定微量尿蛋白的高灵敏方法。在pH2.9,血清蛋白能与Ti-DBPF-Tween-80形成蓝色络合物,最大吸收波长为605nm。加入小量乙醇能提高方法的灵敏度和稳定性,牛血清蛋白含量在0~150μg/25ml范围内服从Beer定律。尿液中其它成分不干扰测定。用拟定的方法测定人尿蛋白,获得满意结果。

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The dye C.I. Acid Blue 80 (AB80) was easily degraded by TiO2-P25 assisted photocatalysis in aqueous dispersion under irradiation of sunlight. The optimal reaction conditions were [TiO2] = 2.0 g/L, pH = 10, [H2O2] = 5 mmol/L. The photocatalytic reaction followed pseudo-first order kinetics. The adsorption of AB80 onto TiO2 was in accord with Langmuir equation.

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雪鸡坪斑岩铜矿位于西南三江构造火成岩带义敦岛孤带,其成矿斑岩为印支期石英闪长玢岩和石英二长宽岩。研究对该矿区安山岩、矿化斑岩和矿石矿物系统进行S,Pb同位素分析结果表明:金属硫化物的δ34S值为-3.1‰~+0.7‰,平均值为-1.1‰,与矿化斑岩的硫同位素组成(-1.4‰和-1.5‰)一致,均落入幔源硫范围,表明硫主要来自岩浆;δ34S黄铁矿(-1.8‰~+0.7‰,平均0.5‰)〉δ34S黄铜矿(-2.2‰~0.0‰,平均-1.2‰)〉δ34S方铅矿(-3.1‰~1.3‰,平均-2.4‰),硫同位素分馏基本达到平衡。矿石矿物(208Pb/204Pb=37.917~38.230,平均值38.075;207Pb/204Pb-15.528~15.614,平均值15.571;206Pb/204Pb=17.929~18.082,平均值17.981)与矿化斑岩(208Pb/204Pb=37.832、37.883,207Pb/204Pb=15.529、15.538,206Pb/204Pb=17.906、17.910)以及安山岩(208Pb/204Pb=37.816~37.884,207Pb/204Pb-15.549~15.562,206Pb/204Pb=17.845~17.919)的初始铅组成基本一致,变化范围较小,表明三者具有相同的来源;在铅构造模式图上,所有样品铅同位素均位于造山带演化线上或附近,在铅同位素源区判别图中,均落入造山带和下地壳区域,这表明Pb主要来源于壳幔混合。雪鸡坪铜矿S,Pb同位素组成共同指示成矿物质主要来自于深部岩浆,这种岩浆可能主要起源于俯冲洋壳板片的部分熔融并受到少量地壳物质的混染。