Chemical and Physical Signals Mediating Conspecific and Heterospecific Aggregation Behavior of First Instar Stink Bugs

We investigated cues that mediate the aggregation behavior of immature pentatomid bugs by using nymphs of six different pentatomid bug species (Nezara viridula, Acrosternum hilare, Chlorochroa ligata, Chlorochroa sayi, Thyanta pallidovirens, and Euschistus conspersus). When first instars of any two species were put together in a Petri dish, they readily formed heterospecific aggregations similar to their natural conspecific aggregations. The chemical profiles of first and second instar nymphs of each species were determined by solvent extraction with pentane, followed by GC-MS analysis. Immature bugs of the different species had some compounds in common, and some that were more species specific. Within a species, there were distinct differences in the profiles of compounds extracted from first and second instars. Bugs did not aggregate around untreated polysulfone beads (1 mm diam) that were glued together in groups approximating bug egg masses, suggesting that tactile cues alone were insufficient to induce aggregation. Furthermore, when tested over a range of doses, groups of polysulfone beads treated with crude whole-body extracts of bugs did not induce or maintain aggregations. However, first instar N. viridula nymphs did respond to beads treated with two of the three major components of bug extracts. 4-Oxo-(E)-2-decenal induced significant aggregations at two doses, whereas tridecane, the major component in extracts from all six species, did not, and (E)-2-decenal was repellent. The repellence of (E)-2-decenal may explain why we and previous researchers were unable to induce aggregations of first instar N. viridula using whole-body extracts.     

纳米稀土复合固体超强酸催化合成乙酸苄酯

采用共沉淀法制备了纳米稀土复合固体超强酸SO4^2-／ZrO2-2％Nd2O3催化剂，电镜分析表明，催化剂颗粒直径在25nm左右，比表面积测定：71．03m^2／g。酸强度-12．70〈Ho〈-11．99。并对合成乙酸苄酯的最佳反应条件进行了研究。研究表明：当苯甲醇与乙酸的物质的量比为1：2，反应时间为5h，反应温度为120℃，催化剂用量为6％苯甲醇的质量时，酯化率可达92．04％。研究发现，该催化剂可重复使用并可活化再生。     

SMA-5应力吸收层在旧水泥路面加铺改造中的应用研究

为减少和延缓旧水泥板沥青加铺层反射裂缝的产生,在分析研究各种夹层材料应用效果和SMA-5作为应力吸收层性能要求的基础上,设计了SMA-5应力吸收层的配合比,采用搓揉成型的方法改进了马歇尔试件,并对SMA-5沥青混合料的各项路用性能进行了试验研究,且成功的铺筑了试验路.结果表明:SMA-5沥青混合料可以作为夹层材料,并起到了很好的应力吸收效果.此项研究成果对于旧水泥混凝土路面加铺改造具有重要的工程实用价值,SMA-5应力吸收层具有广阔的应用前景.     

Electrocatalytic activity of oxidation products of guanine and 5′-GMP towards the oxidation of NADH

We have studied the potential electrocatalytic activity towards the oxidation of NADH of several oxidation products of guanine and its derivative guanosine-5′-monophosphate (5′-GMP) on pyrolytic graphite electrodes (PGE). The distribution of products generated strongly depends on the experimental conditions. Our investigations focused on the oxidation products that are adsorbed on the electrode surface, are redox active and, exhibited electrocatalytic activity toward the oxidation of NADH. These compounds were electrochemically and kinetically characterized in terms of dependence of the formal potential on pH and electron transfer rate constant (k_s). The voltammetric and catalytic behavior of both guanine and 5′-GMP oxidation products was compared with that of other guanine derivatives we have previously studied. Some mechanistic aspects concerning the generation of the catalysts are also discussed.     

MC(Mid-Century)催化氧化过程的研究进展

介绍了MC催化氧化过程规律；从催化荆体系的改进、新型溶剂体系的开发、反应器构型和配套设施的改进、富氧氧化技术的开发等方面综述了近年来MC技术的发展；探讨了MC液相催化氧化技术应用范围的拓展以及MC液相催化氧化过程的发展方向。     

3—乙酰基—5—溴 酚酮的合成

2-乙酰基-7-甲氨基酮1与溴反应得2-乙酰基-7-甲氨基-4-溴酮2。2与氢氧化钠反应得3-乙酰基-5-溴酚酮3。化合物2和3是两种新化合物,其结构已经红外光谱、核磁共振谱及元素分析证实。     

陶瓷原料中二氧化硅分析方法的对比与选择

本文综合各种文献 ,对陶瓷原料中SiO2 的各种分析方法的优缺点 ,使用条件 ,应用侧重点进行了比较与评述     

利用C_5开发叔戊基甲醚

介绍了利用C_5生产汽油抗爆剂叔戊基甲醚的工艺进程。其中KOCH公司开发的催化蒸馏工艺是目前最先进的工艺。我国当前尚未有工业化生产叔戊基甲醚的装置。利用流化催化裂化C_5生产叔戊基甲醚是急待开发的课题。     

The reduction/oxidation behaviour of MnAPO-5 as studied by ESR spectroscopy

It is shown by ESR spectroscopy that Mn²⁺ ions in MnAPO-5 are oxidized to Mn³⁺ during calcination atT475 K. Mn²⁺ occupies variously distorted tetrahedral positions within the framework and in extra-lattice sites. Octahedrally coordinated Mn²⁺ presumably located in the channels becomes detectable after adsorption of water. The ESR spectra of reduced MnAPO-5 show line-narrowing due to spin exchange interactions. The material behaves reversible in redox cycles at temperatures near 500 K.     

2-（4-氯苯氨基）甲基苯酚降解的动力学研究

采用高效液相色谱技术,开展了Fenton试剂对2-（4-氯苯氨基）甲基苯酚（CMP）的氧化降解动力学的研究。考察了初始双氧水摩尔浓度、亚铁离子摩尔浓度和温度等因素对CMP降解速率的影响,结果表明,当双氧水摩尔浓度、亚铁离子摩尔浓度增大和温度升高时,CMP的氧化速率明显加快。在30~45℃的温度范围内,其氧化降解符合假一级反应动力学模型,反应的表观活化能Ea为102.90kJ/mol。