吸毒现场吸毒工具中的甲基苯丙胺分析

Based on the details in the case, the analysis method of methamphetamine was built up, which is supposed to be used for in vitro material taken from the criminal scene. It is suggested that GC-FID is first used for methamphetamine concentration scanning. Thus, according to the results, the sample could be concentrated or diluted for the next GC/MS analysis. Using this procedure, the satisfying result was achieved.     

一例“冰毒”晶体的GC/MS分析

Analysis of the seized amphetamine was performed using GC/MS. The method was investigated in terms of extraction methods, aiming at the effective removal of adulterants in high concentration, which interfere amphetamine analysis. This research is supposed to be useful for analyzing the seized drags similar with the one in this paper.     

蜂花粉可溶性膳食纤维酶法提取工艺优化及其理化分析

采用纤维素酶法提取蜂花粉可溶性膳食纤维,分析其理化特性,并与酸提、碱提产品进行对比。结果表明,酶法提取蜂花粉可溶性膳食纤维最优工艺条件为:酶解温度50℃,酶解时间2h,酶用量2.5%,pH 4。在该条件下,可溶性膳食纤维得率为4.11%,产品呈乳白色、粉体,荷花蜂花粉特有气味浓郁,膨胀力2.03 mL/g、持水力1.01 g/g、水溶性91.26%,含有甘露糖、鼠李糖、葡萄糖醛酸、半乳糖醛酸、葡萄糖、半乳糖、阿拉伯糖7种单糖组分,具有多糖特征吸收峰。与碱提、酸提工艺相比,酶提产品具有较好水溶性和感官品质,更易于应用在饮料类食品的开发中。     

蜂花粉保健功能及产品开发研究进展

文章综述了蜂花粉增强免疫、抗氧化、抗肿瘤、降血糖、防治前列腺增生、对肝细胞损伤的保护、抗炎症、抑制褐色素产生等保健功能,分析蜂花粉开发中存在的破壁、致敏等主要问题,简述了以蜂花粉为原料的食品、保健品及药品等产品的开发现状及技术储备状况。     

视频的超分辨率增强技术综述*

视频超分辨率增强的目的在于从时间上弥补视频采样设备采样帧率的不足, 描述高速运动变化对象的细节信息; 在空间上复原视频图像截止频率之外的信息, 以使图像获得更多的细节。这项技术广泛应用于视频通信、监控、遥感和高清晰度电视等多个领域。从视频超分辨率的含义、发展现状、主要技术方法和未来研究展望等方面, 对视频超分辨率增强领域的研究进行了综述。     

不同方法提取荷花蜂花粉可溶性膳食纤维的多酚含量及对微生物生长的影响

以纤维素酶酶解提取、酸溶液提取、碱溶液提取3种方法提取的荷花蜂花粉可溶性膳食纤维(bee pollen soluble dietary fiber,BPSDF)为研究对象,探究提取方法对BPSDF多酚含量及常见致病菌、有益菌生长的影响。结果表明,BPSDF中多酚主要以游离态的形式存在,纤维素酶酶解提取、酸溶液提取、碱溶液提取的游离酚分别占其总酚的81.16%,80.34%,69.59%;纤维素酶解提取的游离酚、总酚含量相对较高;碱溶液提取的结合酚含量相对较高。提取方法不同BPSDF游离酚、结合酚和总酚含量均差异显著,但对BPSDF中游离酚、结合酚的多酚组分影响较小。3种方法提取的BPSDF对大肠杆菌、金黄色葡萄球菌、白色念珠球菌均有较好的抑制作用,相对来说纤维素酶酶解提取的BPSDF的抑菌作用最好;3种方法提取的BPSDF对双歧杆菌和嗜酸乳杆菌有一定的促进作用,且对供试有害菌的抑制作用优于对供试有益菌的促进作用。     

丙酸盐影响利迪链霉菌AS 4.2501生产利迪链菌素及其碳流分布

To achieve higher antibiotic streptolydigin productivity through metabolic regulation, propionate was fed during the fermentation of Streptomyces lydicus AS 4.2501. The effects of propionate feeding on streptolydigin production and intracellular fluxes were investigated. The highest streptolydigin production yield of 95.10mg·L^-1 was obtained when 2mmol·L^-1 of sodium propionate was added at 60h of cultivation into shake-flask culture. This yield is 23.06% higher when compared to that of a batch culture without propionate supplementation. It was also found that when propionate was added, much more organic acids were excreted. Metabolic flux analysis was performed and it demonstrated that the carbon fluxes of the pentose phosphate pathway and the anaplerotic reaction were significantly increased after propionate feeding. The carbon flux from pyruvate to acetyl-CoA was determined to be 24.7, which was 12.27% higher than that in the batch culture. This study indicated that the glucose-6-phosphate and pyruvate nodes were potential bottlenecks for increasing streptolydigin productivity. Potential targets and strategies that could be manipulated through genetic and process engineering to increase the production of streptolydigin were also suggested.     

油菜蜂花粉破壁技术研究进展

文章综述了油菜蜂花粉的细胞结构、破壁形态及其破壁方法,分析对比了各种破壁方法的优劣,总结了破壁油菜蜂花粉的应用开发现状,并对后期油菜蜂花粉破壁技术的研究进行了展望。     

基于数据挖掘改善脾虚药膳的组方规律

运用统计分析软件中医传承辅助平台(V2.5)挖掘《中国药膳大辞典》收录的改善脾虚药膳的组方规律,拟为开发促进消化、增强免疫力、抗氧化、缓解体力疲劳、改善睡眠等与改善脾虚相关的中药保健食品新方创制提供新的思路.通过中医传承辅助平台(V2.5)对《中国药膳大辞典》中收集的改善脾虚药膳方进行用药频次统计、关联规则和熵层次聚类...