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   

Bilingual poetry: expanding the cognitive and cultural dimensions of children's learning     

Charmian Kenner  Salman Al‐Azami  Eve Gregory  Mahera Ruby 《Literacy》2008,42(2):92-100

Stories and poetry have long been considered a resource for the language and literacy development of bilingual children, particularly if they can work with texts in both mother tongue and English. This paper demonstrates that bilingual learning is also beneficial for second and third‐generation children whose English is often stronger than their mother tongue. Presenting data from an action research project in East London primary schools, we show how children investigated metaphor and cultural content in a Bengali lullaby, clarifying concepts through dialogue with their parents. Comparison with a lullaby in English from North America generated additional ideas concerning different cultural values. The learning process enabled children to use their bilingual skills and draw on different aspects of their bicultural identities. Finally, we explain how bilingual poetry can be used to stimulate learning in a multilingual classroom context, through the example of a whole‐class lesson based around Bengali and English lullabies.  相似文献   

The effect of potential fall distance on hormonal response in rock climbing     

Jiří Baláš  David Giles  Leona Chrastinová  Kateřina Kárníková  Jan Kodejška  Alžběta Hlaváčková 《Journal of sports sciences》2017,35(10):989-994

The aim of this study was to examine the effect of alterations in potential lead fall distance on the hormonal responses of rock climbers. Nine advanced female climbers completed two routes while clipping all (PRO-all) or half (PRO-½) of the fixed points of protection. Venous blood samples were analysed for total catecholamines, noradrenaline (norepinephrine), adrenaline (epinephrine), dopamine, lactate, cortisol and serotonin. Differences between the two conditions pre, immediately post and 15 min post climbing were assessed using a 2 × 3 repeated measures ANOVA. All hormones and blood lactate concentrations increased significantly (P < 0.05) immediately post climb, except for cortisol. Peak cortisol concentrations did not occur until 15 min post ascent. Further, significant interactions between climbing and clipping conditions were found for total catecholamines (890% of basal concentration in PRO-½ vs. 568% in PRO-all), noradrenaline (794% vs. 532%) and dopamine (500% vs. 210%). There were no significant interactions for adrenaline (1920% vs. 1045%), serotonin (150% vs. 127%) or lactate (329% vs. 279%). The study showed a greater catecholamine response with an increase in potential lead fall distance. The most pronounced increases seen in catecholamine concentration were reported for dopamine and noradrenaline.  相似文献   

From agricultural extension to capacity development: exploring the foundations of an emergent form of practice     

Al Lauzon 《International Journal of Lifelong Education》2013,32(2):247-266

This essay argues that capacity development is a response to changes in the organization and practice of agricultural extension as these changes have excluded small resource farmers. In this essay I trace the changes in the organization of agricultural extension through to the emergence of the concept and practice of capacity development. The idea of capacity development is then examined as presented in the existing literature where it is concluded that capacity development is a somewhat vacuous concept. It is then argued that capacity development needs to be understood in the context of an emerging participatory worldview. The foundations of this participatory worldview are then articulated, including the dimensions of a participatory epistemology. The concept of capacity development is then revisited examining the implications of this new worldview for the practice of capacity development followed by the conclusions.  相似文献   

The health sciences library network for India     

A. Majid Pathan  C. R. Karisidappa 《International Information and Library Review》2013,45(3):411-439

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Effects of a Reading Intervention Implemented at Differing Intensities for Upper Elementary Students     

Rachel E. Donegan  Jeanne Wanzek  Stephanie Al Otaiba 《Learning disabilities research & practice》2020,35(2):62-71

Students with disabilities who display severe reading difficulties may require intensive interventions in order to make progress. The purpose of this study is to examine the effects of a multicomponent reading intervention implemented at two different intensities, in two separate randomized control trials, for a subset of fourth-grade students who displayed severe reading difficulties, and who had or were at risk for disabilities. We use multilevel models to examine the effect of a standard, less intensive implementation in Study 1, and of a more intensive implementation in Study 2, relative to typical school services. Analyses revealed no significant effects of treatment for the standard, less intensive implementation in Study 1. Significant effects for word reading and word reading fluency outcomes for students assigned to receive the intensive implementation were noted in Study 2. Implications, limitations, and directions for future research are discussed.  相似文献   

Preparing beginning reading teachers: An experimental comparison of initial early literacy field experiences     

Stephanie Al Otaiba  Vickie E. Lake  Luana Greulich  Jessica S. Folsom  Lisa Guidry 《Reading and writing》2012,25(1):109-129

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Standardizing characterization of membrane active peptides with microfluidics     

Kareem Al Nahas  Ulrich F. Keyser 《Biomicrofluidics》2021,15(4)

Antimicrobial peptides (AMPs) are emerging as important players in the fight against antibiotic resistance. In parallel, the field of microfluidics has matured and its benefits are being exploited in applications of biomimetics and standardized testing. Membrane models are essential tools extensively utilized in studying the activity and modes of action of AMPs. Here, we describe how the utilization of microfluidic platforms in characterizing membrane active peptides can develop a reliable colorful image that classical techniques have rendered black and white.  相似文献   

Library and Information Services to the Arabic‐Speaking Community: A Survey of Michigan Public Libraries     

Charlene L. Al‐Qallaf  Joseph J. Mika 《Public Library Quarterly》2013,32(2):127-161

Public Libraries tout that they serve diverse communities, even having collection development policies, programs, and service that recognize their dissimilar neighborhoods. The authors of this article, having noted the influx of Arab‐speaking populations from Iraq and other Middle East countries to the United States, sought to find out the extent to which this population was receiving library service. The investigators discovered that four Michigan counties comprise a significant Arab‐speaking population; in fact, that population base is surpassed only by that of the Middle East countries and Paris, France. The researchers constructed a survey, based on a successful model used with libraries serving Spanish‐speaking populations and applied it to the Michigan libraries in the counties with a significant Arab‐speaking population. The results reveal that the Arab‐speaking neighborhoods, at least at the time of the survey, were not very well served (except in a few instances) by their public libraries.  相似文献   

Sexual Justice Is Social Justice: An Activity to Expand Social Work Students Understanding of Sexual Rights and Injustices     

George W. Turner  Al Vernacchio  Brent Satterly 《Journal of Teaching in Social Work》2013,33(5):504-521

Social work education could benefit from an explicit educational framework that combines social justice and sexuality: sexual justice. However, there is a paucity of literature in social work discussing this critical issue. This article helps equip social workers to challenge social injustice through a lens of sexuality and builds a conceptual framework by examining sexual justice through pillars of social work: human dignity, community and solidarity, rights and responsibilities, priority for the poor and vulnerable, and peace. An activity providing micro and macro case discussions is presented to help infuse sexual justice into social work programs.  相似文献