有机相中刻录脂肪酶聚合物对配体的吸附

以聚乙二醇400二丙烯酸酯和三羟甲基丙烷三甲基丙烯酸酯为原料，加入脂肪酶液，配体月桂酸，表面活性剂，经紫外光聚合和有机溶剂洗脱月桂酸，获得锁定了由配体诱导脂肪酶活性构象的聚合物——刻录脂肪酶聚合物（RLP），对RLP在月桂酸溶液中的吸附行为进行研究，测定了温度在30~50℃ 的吸附等温线。结果表明，RLP对其配体月桂酸的吸附能力远大于空白聚合物对月桂酸的吸附能力, 达到8.7倍。平衡吸附量和平衡浓度的关系符合Langmuir和Freundlich吸附等温方程。     

吉安散装人抗冰战雪保平安——江西吉安散办干部职工铲除冰保畅通纪实

春节前后,吉安市遭遇到罕见的冰冻雨雪灾害天气,连续出现了低温、阴雨和雨夹雪,成为全省灾情最严重地区之一.特别是1月25日以后,出现了持续大范围的雨雪冰冻天气.冰冻损坏了市区的电网,压垮了树枝,封锁了道路和桥梁.     

2010～2011年世界塑料工业进展

收集了2010年7月～2011年6月世界塑料工业的相关资料,介绍了2010～2011年世界塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况。按通用热塑性树脂(聚乙烯、聚丙烯、聚氯乙烯、聚苯乙烯、ABS树脂),工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚),特种工程塑料(聚苯硫醚、液晶聚合物、聚醚醚酮),通用热固性树脂(酚醛、不饱和聚酯树脂、环氧树脂、聚氨酯)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍。     

花粉症诱因探究

花粉症又称季节性鼻炎或枯草热,是敏感个体对花粉的一种超敏反应.在美国,每一百个人当中就有两个以上的人患花粉症;现在日本有1300万人饱受花粉症折磨,超过总人口的10%[1].我国的发病率为0.5%～1%,高发区达到5%,虽没有上述一些国家那么严重,受害者亦相当可观.全世界花粉症发病人数到1999年就已有5000多万[2],可见花粉症患者是一个绝不可轻视的群体.图1显示了花粉过敏症的发病机制.     

欧文斯科宁专访

欧文斯科宁公司(以下简称OC)创建66年来一直致力于开发玻璃纤维的新用途,是建筑材料和复合材料行业的领先创新者和制造商,OC进入亚太市场也已超过30年,长久以来他们专注于推广复合材料的应用领域以及扩大其供应基地.最近,欧文斯科宁在印度扩充了生产能力,并在上海设立了技术中心.至今为止,欧文斯科宁在亚太区已有超过1800名员工,从事建筑材料和复合材料的生产,销售和研发工作.     

喷涂前处理污染源的分析及其处理措施

随着我国国民经济的快速发展和国家"节能减排"重点项目的深入开展,各种污染源的分析及其处理措施的研究备受关注.本文在充分研究若干家电企业的钢铁喷涂制件的前处理工艺(如:预脱脂、脱脂、清洗、表调、磷化等)的基础上,分析喷涂前处理过程中的污染源,研究污染源的处理措施.     

酿酒酵母细胞表达异源萜类化合物的研究进展

萜类化合物具有可观的经济价值,但是目前的生产过程复杂、产量低。酿酒酵母甲羟戊酸途径为萜类化合物的合成提供直接前体,因此酿酒酵母细胞具有合成异源萜类化合物的天然优势。对酿酒酵母甲羟戊酸途径的清晰认识是对其进行有效利用的基础,本文从代谢途径、关键酶的特点和全局调控机制3个方面对该途径进行了介绍。从代谢途径的构建和优化、模块与底盘细胞的适配、模块构建及组装方式的角度概述了酿酒酵母细胞异源合成单萜、倍半烯萜、二萜、三萜类化合物的研究进展。指出实现酿酒酵母高效合成萜类化合物所需要解决的基础问题是对酿酒酵母甲羟戊酸途径进行更为全面了解和对萜类化合物的天然代谢途径进行明确解析;另外,合成生物学的进一步发展也将为此提供应用基础。     

2-丁烯合成有机硫化剂的研究

实验以2-丁烯和单质硫为原料,在高温高压催化剂条件下合成有机硫化剂.考察了反应温度、反应时间、硫烯比、催化剂种类以及催化剂用量对硫化剂硫含量的影响,其中重点考察了有机碱性催化剂、无机碱性催化剂、秋兰姆类((CH3)2NCS4CN(CH3))催化剂对硫化剂硫含量的影响.实验结果表明,催化剂对硫含量的影响很大,秋兰姆类和二乙胺催化剂的影响最大,硫含量分别为27.1%和26.64%.     

2006～2007年世界塑料工业进展

收集了2006年7月～2007年6月世界塑料工业的相关资料,介绍了2006～2007年世界塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍.     

回转窑耐火砖的砌筑及使用

我公司回转窑规格为Φ4.0m×60m.窑内使用的耐火砖为镁铬砖、隔热尖晶石、蓝晶石和黏土砖以及硅莫砖.镁铬砖规格为(81×90×150×200)mm,其它耐火砖规格皆为(81×90×200×200)mm.尽管每个品种的砖品质相同,但由于在镶砌和使用过程中方法不同,寿命有长有短.通过多年实践,现总结如下.     

RHEOLOGICAL BEHAVIOR OF LOW-RANK COAL-WATER SLURRIES

The rheological behavior of low-rank coal-water slurries was studied using a Brookfleld Rheolog viscometer. A Sarpy Creek subbituminous coal from Montana, with particle sizes ranging from 0.044 mm to 0.223 mm, was used. The solids concentration in the slurry varied from 15 to 65 weight % and the temperature was maintained constant at 82°F. The rheological behavior of the slurry made from as received coal was compared with that of the slurry made from hot water dried coal

Coal-water slurries, made from both as received and hot water dried coal exhibited pseudoplastic behavior. The shear stress was found to be related to the shear rate by the power law model. As expected, the apparent viscosity was found to increase sharply with solids loading. It was also observed that the apparent viscosities of the slurries made from hot water dried coal were lower than those made from as received coal.     

RHEOLOGICAL BEHAVIOR OF LOW-RANK COAL-WATER SLURRIES

The rheological behavior of low-rank coal-water slurries was studied using a Brookfleld Rheolog viscometer. A Sarpy Creek subbituminous coal from Montana, with particle sizes ranging from 0.044 mm to 0.223 mm, was used. The solids concentration in the slurry varied from 15 to 65 weight % and the temperature was maintained constant at 82°F. The rheological behavior of the slurry made from as received coal was compared with that of the slurry made from hot water dried coal

Coal-water slurries, made from both as received and hot water dried coal exhibited pseudoplastic behavior. The shear stress was found to be related to the shear rate by the power law model. As expected, the apparent viscosity was found to increase sharply with solids loading. It was also observed that the apparent viscosities of the slurries made from hot water dried coal were lower than those made from as received coal.     

轮胎花纹顺逆向沟噪声动力学分析

从动力学角度研究不同开口方向的花纹沟的噪声差别。分析及仿真试验结果表明,逆向沟口喷出的气团除了原有速度外,还加入了一个向前的车速的分量,而顺向沟喷口气团速度减去一个分量速度;根据推导的经验公式得出逆向花纹沟的噪声比顺向沟大3 dB左右。     

USE OF IRON-IMPREGNATED GRANULAR ACTIVATED CARBON FOR CO-ADSORPTIVE REMOVAL OF PHENOL AND CYANIDE: INSIGHT INTO EQUILIBRIUM AND KINETICS

In the present study, the effect of iron impregnation on granular activated carbon (GAC) for removal of multicomponents from synthetic wastewater was studied. It was observed that percentage removal of phenol and cyanide increased from 72.89% to 91.82% and from 75.99% to 95.57% respectively. A decrease in equilibrium time from 33 to 27 h and a decrease in optimum adsorbent dose from 30 to 10 g/L were also observed. Equilibrium modeling using two single-component isotherms and four multicomponent isotherms was performed, and it was found that extended Langmuir and extended Freundlich isotherm fits best to the adsorption of phenol and cyanide, respectively. Kinetic modeling using contact time studies was done to reveal the nature of adsorption and it was found that the rate-limiting step was a chemical adsorption process.     

Effectiveness of different phosphatic fertilizers measured using labelled superphosphate and phosphorus taken up by plants

The agronomic effectiveness of three P fertilizers (diamonium phosphate, rock phosphate and compost) was studied in a greenhouse experiment using wheat. A radioisotopic method, using triple superphosphate labelled with³²P, was used to evaluate the P in dried tops that was derived from i) the soil, ii) labelled superphosphate and iii) the fertilizer being studied.The ratio between P uptake from each fertilizer and P uptake from the soil was used to compare the effectiveness of the different fertilizers. P derived from diammonium phosphate was greater than P derived from the soil, except in one soil. P derived from rock phosphate was always lower than P derived from the soil. The effectiveness of compost depended on soil type. Compost can produce two kind of effects: i) a direct P contribution and ii) an indirect effect improving P uptake from the soil. The radioisotopic method can be used to study the effectiveness of fertilizers even when there are no differences in yield.     

纤维素酶对豆粕异黄酮提取的影响

在常规的醇提工艺前用不同微生物来源的纤维素酶对豆粕进行预处理，研究结果发现：细菌纤维素酶能使异黄酮的提取率提高1.4倍，产物以糖苷型异黄酮为主，与直接醇提得到的产物组成相类似；来自黑曲霉的纤维素酶对大豆异黄酮的提取率没有影响，但能将糖苷型异黄酮转化为苷元型异黄酮；里氏木霉纤维素酶能使醇提液中大豆异黄酮的提取率提高1.6倍，并能把以糖苷型为主的异黄酮转化为具有更高生理活性的苷元型异黄酮。里氏木霉纤维素酶的最适用量为15 FPIU·(g豆粕)-1，酶作用时间为36 h。采用弱极性的大孔树脂精制苷元型异黄酮，效果较好。     

磷石膏基矿井充填材料制备及其性能研究

为实现磷石膏的资源化利用,制备了以原状磷石膏为主要原料、赤泥为碱性激发剂的矿井充填材料,并分析了高效减水剂掺量、水泥掺量、赤泥掺量对其性能的影响。实验结果表明,水灰质量比为0.2,聚羧酸盐减水剂掺量为0.5%（质量分数）时,浆料的初始流动度约为230 mm,满足充填材料性能要求;水泥掺量从0增加到10%时,28 d抗压强度从2.03 MPa提升至10.75 MPa,初始流动度从180 mm增加到235 mm,强度保持率从0.39提升至1,表明水泥掺量直接影响充填材料的强度、流动性及耐水性能;赤泥掺量从0增加到5%时,28 d抗压强度提升了50%,强度保持率从0.82提升至1,激发作用明显,对材料的流动性有相反的影响。     

Naegeli茶螺烷合成方法的改进

对Naegeli报道的以β-紫罗兰酮为原料经乙酸异丙烯酯酯交换、硼氢化钠还原成逆紫罗兰醇再环化合成茶螺烷的方法进行了改进,改进后的合成方法反应副产物巨豆三烯含量从15%降至4%,反应时间明显缩短,茶螺烷的收率从75%提高至84.5%。     

膜技术在糖蜜酒精废液处理中的应用

研究了用膜直接过滤和逐层过滤的方法对糖蜜酒精废水进行了处理,结果表明：糖蜜废水原液直接过滤0.45μm的微滤膜时有902.5mg/L的COD被过滤掉;在0.22μm到10000Da分子量之间总共截留了1164mg/L COD的污染物。小于10000Da分子量的污染物COD的总量为6903.8mg/L。经过0.45μm和0.22μm的微滤膜时渗滤液由混浊变得澄清,颜色由黑褐色直接变为浅褐色。再经过140000Da分子量超滤膜后,糖蜜废水已经完全澄清。从140000Da超滤膜逐级过滤后出水,糖蜜废水的颜色为淡的黄褐色、水质澄清。     

用硬填料回收催化热油泵密封油的试验研究

在回收催化热油泵密封油的试验中,用硬填料作为密封油和介质的隔离装置。介绍了硬填料密封的基本结构及密封原理,给出了比压计算式。试验结果是较理想的。