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1960年末,壳牌公司发现了一种作用于谷类作物的除草剂乙二醇苄醚[图1,(1)],随后一系列具有良好活性的乙二醇苄醚类除草剂相继被发现[图1,(2)(3)]。这些化合物的结构特征都是一个含氧杂环带有苄氧基或相似取代基。 相似文献
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[目的]为在新农药创制工作中,寻找高活性化合物。[方法]以香草醛为起始原料,经烷基化、缩合、还原、磺酰胺化4步反应,设计并合成了21个未经文献报道的N-(4-烯丙基氧基-3-甲氧基苄基)-N-烷基磺酰胺类化合物,其化学结构经核磁共振氢谱确证,并对合成的化合物进行了室内杀虫、杀菌、除草生物活性的筛选。[结果]初步的生物活性表明,该类化合物具有良好的除草活性,质量浓度为250 mg/L时,化合物C9、C10、C11、C15、C16、C17、C19、C21对苋菜的抑制率达100%。[结论]该类化合物值得进一步研究。 相似文献
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鞋底的止滑性直接影响着鞋子穿用时的舒适性和安全性,止滑性主要由摩擦系数来表示,在一定范围内,摩擦系数越大,止滑性越好;系统通过测量作用于鞋的拉力和压力,求得摩擦系数,从而来判断各种鞋子的安全性能,因此对拉力压力的测量显得十分重要;鞋底摩擦系数测控系统通过串口将采集到的拉力和压力数据发送给上位机实时处理、显示、绘图并保存;最后对系统进行了测试,所测得的各种材质的摩擦系数符合国际标准,验证了它的正确性且测量精度高。 相似文献
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Diabetes mellitus is an incurable disease, so it is necessary to establish a model to screen biomarkers for early warning in order to minimize the likelihood of long-term complications. Current- ly, advanced glycation end products (AGEs) are considered to be biomarkers of many diseases, such as diabetes and its complications. In this study, a model for further proteomics study was es- tablished to analyze the glycation of HSA with 18 O-labeling strategy. 30 peptides were randomly se- lected to optimize tryptic digestion and 18O-labeling condition by HPLC-ESI/TOF. The best tryptic di- gestion condition was: HSA: Trypsin = 50: 1, w/w for 20 h. The best t8 O-labeling condition was to di- lute urea to 1 M and adjust KH2 POa--K2 HPO4 buffer pH to 6.0 to give a final labeling efficiency of 98.5 ± 0.7%. The inter- and intra-day precisions and stability were satisfactory. This model was es- tablished and optimized for further quantitative proteomics study. 相似文献
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