4,4'-二碘-对-三联苯的合成研究

以对三联苯为原料,经过碘代反应,合成了4,4'-二碘-对-三联苯,经精致提纯,收率为64%;并通过红外光谱验证了产品的结构.     

马铃薯酸乳的研制

马铃薯与鲜乳混合后进行乳酸发酵,产品营养全面,酸乳的感官品质有较大提高。     

由稻壳灰制备活性炭的工艺及应用研究

对利用稻壳灰与碱反应制备活性炭、水玻璃及白炭黑的工艺条件进行了研究，通过单因素实验和正交实验，筛选出了反应的最佳工艺条件：稻壳灰与KOH配比为1：0．22，反应时间4h，反应压力0．6MPa。在此条件下二氧化硅的溶出率为95％，硅酸钾的模数为2．8—3．2，白炭黑的白度在90％以上。提出了提高产品质量的有效方法，对产品的应用性能也作了分析。实验结果表明采用炭化稻壳为原料生产的活性炭、白炭黑及水玻璃质量完全达到了相应的国家标准，为稻壳的综合利用提高农副产品的价值及解决环境污染提供了一条有价值的途径。     

快速气相色谱法测定烟草中有机氯农药残留

建立了一种同时测定烟草中17种有机氯农药残留量的毛细管气相色谱分析方法。样品在索格利特萃取器中用正己烷和弗罗里硅土一步提取和净化,采用SE-54弹性毛细管柱,GC-ECD(Ni63)检测,外标法定量。试验表明,样品的加标回收率在75.14%~106.93%,相对标准偏差(RSD)为1,52%~16,99%,并对3个不同产地的烟叶样品进行了实际有机氯农药残留量的测定。      

Grape seed proanthocyanidin extracts alleviate oxidative stress and ER stress in skeletal muscle of low‐dose streptozotocin‐ and high‐carbohydrate/high‐fat diet‐induced diabetic rats

Although ER stress in pancreas, liver, and adipose tissue was reported to be a novel event linked to the pathogenesis of type 2 diabetes mellitus, there is much less information on this event in skeletal muscle. Some studies indicated that treatment with antioxidants had beneficial effects on ER stress and diabetes. This study focuses on the effects of a strong antioxidant, grape seed proanthocyanidin extracts (GSPE), on skeletal muscle in diabetic rats induced with low dose streptozotocin‐ and a high‐carbohydrate/high‐fat diet. After 16 wk of GSPE treatment, diabetic rats showed decreased plasma glucose levels and insulin resistance. The efficacious effect of GSPE was manifested by the amelioration of muscular damage and dysfunction, as observed by histological examination and periodic acid Schiff staining. Concurrently, calcium overload and the abnormal activities of antioxidant enzymes and ATPases in diabetic muscles were partially reversed by GSPE treatment. GSPE also increased the activity of protein kinase B (a mediator of insulin's metabolic action) and partially alleviated severe ER stress. These findings suggest that GSPE may have auxiliary therapeutic potential for type 2 diabetes mellitus by decreasing oxidative stress and ER stress in skeletal muscle.     

Acetylsalicylic acid alleviates chilling injury of postharvest loquat (Eriobotrya japonica Lindl.) fruit

Loquat (Eriobotrya japonica Lindl. cv. Luoyangqing) is a chilling-sensitive fruit and therefore has a limited postharvest life. While fruit stored at 5 °C retained its acceptable quality after 39 days, fruit stored at 0 °C had chilling injury with the symptoms of tissue browning and lignification, decrease in percentage juice, increase in superoxide free radical production, electric conductivity and lignification enzyme activities, including phenylalanine ammonia lyase (PAL), cinnamyl alcohol dehydrogenase (CAD), and guaiacol-peroxidase (G-POD). Such chilling injury symptoms became more severe after fruit were moved to 20 °C shelf life. A postharvest application of 1 mmol/L aqueous acetylsalicylic acid (ASA, a derivative of salicylic acid) to loquat fruit significantly alleviated chilling injury symptoms, inhibited accumulation of superoxide free radical, and reduced PAL, CAD, and G-POD activities. ASA treatment impairing the accumulation of superoxide free radical may prevent chilling injury and lignification in loquat.     

高密度电法在城市勘察中的应用

提要该文介绍了在城市勘察工作中应用小极距高密度电法,通过合理设置观测剖面、改变观测方式、综合处理观测数据等技术手段,在滑坡体勘察、基坑渗漏探测以及超深管线探测中取得了较好的效果.该文可为类似工程提供参考.     

水乡往事——绍兴柯岩鉴湖国宾馆创作构想

该文介绍了浙江绍兴柯岩风景区的柯岩鉴湖国宾馆工程,探索了在遗产地景观营造与历史遗产保护相结合的设计方法.     

华侨与粤中近代骑楼圩、镇建设

粤中华侨通过参与官方推行的城镇改造,以及自发建埠、华侨宗族进行圩市建设等方式,不仅推动了近代的城市改良,也推动了传统乡土社会的城市化进程,使得"骑楼"这种独特的建筑形式类型逐步纳入到城市乃至广阔的乡土社会,成为某一特定历史时期广东近代市政建设的主导街道空间形式.