A comparative study of conventional and supercritical fluid extraction methods for the recovery of secondary metabolites from <Emphasis Type="Italic">Syzygium campanulatum</Emphasis> Korth     

Abdul Hakeem Memon  Mohammad Shahrul Ridzuan Hamil  Madeeha Laghari  Fahim Rithwan  Salman Zhari  Mohammed Ali Ahmed Saeed  Zhari Ismail  Amin Malik Shah Abdul Majid 《Journal of Zhejiang University. Science. B》2016,17(9):683-691

Syzygium campanulatum Korth is a plant, which is a rich source of secondary metabolites (especially flavanones, chalcone, and triterpenoids). In our present study, three conventional solvent extraction (CSE) techniques and supercritical fluid extraction (SFE) techniques were performed to achieve a maximum recovery of two flavanones, chalcone, and two triterpenoids from S. campanulatum leaves. Furthermore, a Box-Behnken design was constructed for the SFE technique using pressure, temperature, and particle size as independent variables, and yields of crude extract, individual and total secondary metabolites as the dependent variables. In the CSE procedure, twenty extracts were produced using ten different solvents and three techniques (maceration, soxhletion, and reflux). An enriched extract of five secondary metabolites was collected using n-hexane:methanol (1:1) soxhletion. Using food-grade ethanol as a modifier, the SFE methods produced a higher recovery (25.5%?84.9%) of selected secondary metabolites as compared to the CSE techniques (0.92%?66.00%).  相似文献   

巴基斯坦高等学校设置制度:缘起、程序及标准     

陈恒敏  古尔扎·阿里·沙阿布哈里 《比较教育研究》2017,39(7)

在巴基斯坦现行高等教育行政管理机构及组织体系下,巴基斯坦高等学校设置制度的构建缘起、设置程序及标准具有一定的特色.研究发现,巴基斯坦高等学校设置程序围绕申请、审核、考察、赋权等四个环节进行,具备系统的设置标准,涵盖师资队伍建设、设备场地规范、经费使用、管理若干方面.巴基斯坦高等学校设置制度较为完备,符合本国国情,利益主体均衡,标准刚柔相济,但也存在重硬件、轻科研,未能为高等教育国际化纵深发展预留对接平台,以及“一刀切”色彩过重等问题.  相似文献   

The Privatization of the Internet's Backbone Network     

Rajiv C. Shah Ph.D.  Jay P. Kesan Ph.D. 《广播与电子媒介杂志》2013,57(1):93-109

Scholars have neglected the privatization of the Internet's backbone network, despite the obvious significance of the U.S. government turning control of a powerful new communication technology over to the private sector. This article analyzes the transition from a government-sponsored backbone network to multiple commercially owned backbone networks. The authors also analyze the implications of the privatization on the Internet's governance, competition, and performance.  相似文献   

“Split Screens” and “Spin Rooms”: Debate Modality,Post-Debate Coverage,and the New Videomalaise     

Jaeho Cho Ph.D.  Dhavan V. Shah Ph.D.  Seungahn Nah Ph.D.  Dominique Brossard Ph.D. 《广播与电子媒介杂志》2013,57(2):242-261

This experimental research examines how different presentation modalities in presidential debates and post-debate spin influence the ability to form evaluations about candidates' character, shape perceptions of their incivility, and alter judgments of political trust and news credibility. Results indicate that these experimental factors work together to encourage character judgments, diminish perceptions of candidate civility, and reduce levels of trust in government. In addition, political talk conditioned experimental effects on perceptions of news credibility, with the adverse effects of split screen presentations concentrated among those who talked about the debate. Thus, the negative effects of “in your face” politics conveyed by the “split-screen” modality appear to be most pronounced among those primed to think about performance and those attuned to politics through interpersonal talk.  相似文献   

Using informant directed interviews to discover risk orientation: How formative evaluations based in interpretive analysis can improve persuasive safety campaigns     

Tarla Rai Peterson  Kim Witte  Ernesto Enkerlin‐Hoeflich  Lorina Espericueta  Jason Todd Flora  Nanci Florey 《Journal of Applied Communication Research》2013,41(3):199-215

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Book reviews     

Lucy Robertson  Sheila McConnellogue  Sarah Burcham  Sonia Shah  Alan Hurford 《Educational Psychology in Practice》2010,26(3):299-312

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MEDIA PRIMING EFFECTS: ACCESSIBILITY, ASSOCIATION, AND ACTIVATION   总被引：3，自引：0，他引：3  

Domke  David; Shah  Dhavan V.; Wackman  Daniel B. 《Int. Journal of Public Opinion Research》1998,10(1):51-74

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Early learning and development: cultural-historical concepts in play     

Sonia Shah 《Educational Psychology in Practice》2011,27(3):315-316

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Asia in the edges: a narrative account of the Inter-Asia Cultural Studies Summer School in Bangalore     

Nishant Shah 《Inter-Asia Cultural Studies》2013,14(2):306-314

Abstract

The Inter-Asia Cultural Studies Summer School is a Biennial event that invites Masters and PhD students from around Asia to participate in conversations around developing and building an Inter-Asia Cultural Studies thought process. Hosted by the Inter-Asia Cultural Studies Society along with the Consortium of universities and research centres that constitute it, the Summer School is committed to bringing together a wide discourse that spans geography, disciplines, political affiliations and cultural practices for and from researchers who are interested in developing Inter-Asia as a mode of developing local, contextual and relevant knowledge practices. This is the narrative account of the experiments and ideas that shaped the second Summer School, “The Asian Edge” which was hosted in Bangalore, India, in 2012.  相似文献   

Higher Education in India     

D. D. Karve  A. B. Shah  C. F. Carter  Alvin M. Weinberg  E. Barton Worthington  D. Odhiambo 《Minerva》1964,2(3):379-388

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