相转移催化不对称诱导合成α-氨基酸

在固液两相体系.分别以手性和非手性季铵盐为相转移催化剂,以各种α-溴代脂肪酸薄荷醇酯为手性底物,通过与邻苯二甲酰亚胺钾的Gabriel反应,合成了4种具有光学活性的α-氨基酸,对比了在各种不对称诱导条件下产物的光学纯度.     

Synthetic Iowaite Can Effectively Remove Inorganic Arsenic from Marine Extract

For the removal of arsenic from marine products, iowaite was prepared and investigated to determine the optimal adsorption process of arsenic. Different chemical forms of arsenic (As(III), As(V)) with varying concentrations (0.15, 1.5, 5, 10, 15, and 20 mg/L) under various conditions including pH (3, 5, 7, 9, 11) and contact time (1, 2, 5, 10, 15, 30, 60, 120, 180 min) were exposed to iowaite. Adsorption isotherms and metal ions kinetic modeling onto the adsorbent were determined based on Langmuir, Freundlich, first- and second-order kinetic models. The adsorption onto iowaite varied depending on the conditions. The adsorption rates of standard solution, As(III) and As(V) exceeded 95% under proper conditions, while high complexity was noted with marine samples. As(III) and As(V) from Mactra veneriformis extraction all decreased when exposed to iowaite. The inclusion morphology and interconversion of organic arsenic limit adsorption. Iowaite can be efficiently used for inorganic arsenic removal from wastewater and different marine food products, which maybe other adsorbent or further performance of iowaite needs to be investigated for organic arsenic.     

媒介融合视野下西藏文化产业的创意发展路径

媒介融合技术使各种文化资源获得了最大限度的整合与利用,文化创意产业的价值链得以不断延伸和拓展。在底子薄、基础差、发展迟缓滞后的不利条件和形势下,西藏文化产业要实现通过5年发展,使文化产业增加值占全区生产总值的3％以上。文章提出实施西藏文化产业精品内容战略,走“差异化”发展道路;使艺术与高科技联姻,打造西藏文化创意产业集群和文化产业园区;把发展西藏文化产业和解决民生问题结合起来,把文化工程做成惠民工程;加强西藏文化产业创意人才的开发和培训,是实现文化产业发展的有效路径。     

基于石墨烯的多维度材料构筑及性能研究进展

 石墨烯是碳原子以六角形密堆积形成的二维原子晶体,具有独特的物理化学性质,在电子器件、能源环境和生物医学等领域有着广阔的应用前景。石墨烯的可控制备和组装是其实现实际应用的前提条件。近年来,相继开发出一系列石墨烯自组装与结构调控的技术方法,得到了多种结构特异、组成丰富和性能独特的石墨烯基多维度结构。本文从水溶性的氧化石墨烯出发,综述从零维到三维一系列不同维度和尺度石墨烯的自组装行为和材料构筑策略。对石墨烯的不同组装结构进行系统分类,提出其多维度组装体系的概念。石墨烯的多维度组装体系,在微纳米尺度上包括零维度的石墨烯基纳米颗粒和一维的石墨烯纳米线,在宏观尺度上包括二维石墨烯薄膜和三维的宏观体结构,最后对相关研究领域的发展趋势进行了总结和展望,结合计算化学的相关结果,预测了一系列未开发的石墨烯自组装结构。     

Hydrolysate of corn starch saccharified with a dual-enzyme system and the effect on the crystallization of itaconic acid when used in fermentation

An improved process of hydrolysis of corn starch was adopted in the production of itaconic acid （IA）, the aim was to decrease the unfermentable reducing sugar （RS） in the medium from the beginning of the fermentation and to increase the crystallization efficiency of IA from the fermentation broth. The glucose （GS） syrups saccharified by several combinations of glucoamylase and pullulanase were investigated and used as the carbohydrate source of the fermentation medium for the spore-initiated submerged fermentations experiments. Compared with the conventional process （with pullulanase controlled）, the improved process decreased th.e RS residue in the fermentation broth from 3.01g/L to 1.35g/L and from 4.25g/L to 3.25g/L when the original RS of the medium were 100 and 120g/L, respectively. The crystallization efficiency of IA increased from 65% to 78.8% and from 69.58% to 82.81% with the original RS being 100 and 120g/L, respectively.