American rules, OK: Difference and otherness in ‘Independence Day''

According to its advertisement copy, ‘Independence Day' delivers the ultimate encounter when powerful aliens launch an invasion against the human race. Does this ‘ultimate encounter' simply retrace the old fashioned Hollywood theme of good versus evil? Or is there a more sinister meaning woven into the text of the film? This paper deconstructs the narrative of the film to reveal the underlying monolithic, Americanised modernity and argues that ‘Independence Day' provides an allegorical legitimation for Pax Americana.     

配合物[Co(amb)_2(phen)(H_2O)]_2·CH_3OH的合成与表征

本文主要讨论配合物[Co(mb)(2phen)(H2O)]·2CH3OH(phen是指菲罗啉)的合成和结构表征。对丙烯酰胺基苯甲酸(Hamb)为第一配体,邻菲罗啉(phen)为第二配体,通过固相法与过渡金属醋酸钴反应,合成得到一个结构新颖的配合物,[Co(amb)(2phen)(H2O)]2·CH3OH。并将合成得到的配合物与苯乙烯单体共聚,得到含配合物结构单元的聚合物,为开发配合物-聚合物杂化新材料打下一定的理论基础。     

叶酸治疗H型高血压对同型半胱氨酸及左心室重量指数的影响

目的：探讨叶酸治疗H型高血压对血同型半胱氨酸（Hcy）水平及左心室重量指数（LVMI）的影响。方法选取93例H型高血压患者,将其随机分为3组。对照组32例患者采用常规降压治疗,0.8 mg叶酸组30例患者采用常规降压治疗+叶酸0.8 mg/d,5 mg叶酸组31例患者采用常规降压治疗+叶酸5 mg/d,于治疗前及治疗6个月后分别检测血Hcy数值、心脏超声检查,计算LVMI。结果各组治疗后Hcy、LVMI均降低达到了正常水平（P＜0.05）,在叶酸组中降低均值较大,差异有统计学意义（P＜0.01）。Hcy治疗前后差值组间差异有统计学意义（P=0.001）,进一步比较发现叶酸组较对照组差异均有统计学意义（均P＜0.05）,而叶酸组差异无统计学意义（P＞0.05）。LVMI治疗前后差值组间差异无统计学意义（P=0.095＞0.05）。结论叶酸能明显降低H型高血压患者的Hcy水平,但对左心室重量指数未见明显影响。     

乙醛酸的生产及其市场需求

在文介绍了乙醛酸在精细化学品合成中的典型应用和乙醛酸的基本生产方法,并比较了不同生产方法的各自特点,同时分析了乙醛酸的市场情况,指出了高质量乙醛酸将具有良好的市场前景。     

壬二酸研究的进展

介绍了近年来臭氧法,双氧水法,高锰酸钾法等制备壬二酸的新进展,并对臭氧法制备壬二酸的机理进行了初步探讨.     

2-乙基己酸的合成及应用

本文综述了具有较高实用价值的精细化学品2-乙基已酸的性质、合成方法,并介绍了2-乙基已酸油漆、油墨、高分子材料等领域的应用。指出开发醛法工艺路线具有良好的发展前景和经济效益。     

靛红酸酐的合成与应用

本文介绍了合成靛红酸酐的各种方法和靛红酸酐的应用。     

利用农作物秸秆生产草酸

我国是农业大国,农作物秸秆资源丰富,随着人们生活水平的提高,清洁能源的推广及家畜养殖量的减少,秸秆在农村多被弃置,很多时候被付之一炬,不仅浪费资源还严重污染大气环境。研究利用秸秆生产草酸,旨在为秸秆综合利用寻找出路,走循环经济道路。     

Effects of selected antioxidants on physical and sensory characteristics of yeast bread containing flaxseed meal

Flaxseed has been identified as a potential functional food because of its high content of phytochemicals, alpha‐linolenic (α‐linolenic) acid and lignans. Flaxseed can be used in baked goods because of its minimal loss of α‐linolenic acid. Alpha‐linolenic acid is susceptible to oxidation and the development of off‐aromas and flavours in the food. The focus of this study was to determine the effectiveness of both synthetic and natural antioxidants that were incorporated into a yeast bread that contained 15% flaxseed as a partial replacement for bread flour. The study evaluated the effectiveness of the antioxidants on the physical and sensory characteristics of the bread. Physical properties, such as per cent moisture and loaf volume, were not affected (P > 0.05) by the antioxidants, but ascorbic acid, butylated hydroxytoluene and butylated hydroxyanisole, independently, had a softening affect (P < 0.05) on crumb firmness. Sensory analysis indicated significant (P < 0.05) changes in aroma, grainy taste, aftertaste and moistness in all bread samples regardless of antioxidant, however, only ascorbic acid was rated as effective in maintaining a softer (P < 0.05) crumb.     

产糖区利用生物质制备乙酰丙酸的研究进展

在蔗糖业中开展生物炼制,利用生物质开发绿色平台小分子(如乙酰丙酸),是解决能源危机的重要途径,也符合蔗糖业规避风险和提高市场应变能力的要求.文章分析了蔗糖制备乙酰丙酸的原理和催化剂选择,并以几种固体无机酸催化为例说明,制备中可采用超声-微波协同技术提高生产效率,高效液相色谱法在分离提纯产品中能发挥较好作用.