Somatic embryogenesis in wild relatives of cotton （Gossypium Spp.）   总被引：2，自引：0，他引：2  

Rao AQ  Hussain SS  Shahzad MS  Bokhari SY  Raza MH  Rakha A  Majeed A  Shahid AA  Saleem Z  Husnain T  Riazuddin S 《Journal of Zhejiang University. Science. B》2006,7(4):291-298

Wild cotton species can contribute a valuable gene pool for agronomically desirable cultivated tetraploid cultivars. In order to exploit diploid cotton a regeneration system is required to achieve transformation based goals. The present studies aimed at optimizing the conditions for regeneration of local varieties as well as wild species of cotton. Different callus induction media were tested with varying concentrations of hormones in which sucrose was used as nutritional source. Different explants （hypocotyls, cotyledon, root） were used to check the regeneration of both local cotton plants and wild relatives using T ＆ G medium, BAP medium, CIM medium, EMMS medium, and cell suspension medium. Different stages of embryogenicity such as early torpedo stage, late torpedo stage, heart stage, globular stage and cotyledonary stage were observed in wild relatives of cotton. The results of this study pave the way for establishing future transformation methods.  相似文献   

Teachers＇ perception on the relationship between parents and school     

Ahmad Esa A bdul Rasid Abdul Razzaq Zurina Yasak Zainon Omar 《美中教育评论》2010,7(5):47-54

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Is the ‘Idiot's Box’ raising idiocy? Early and middle childhood television watching and child cognitive outcome     

Abdul Munasib  Samrat Bhattacharya 《Economics of Education Review》2010

There is widespread belief that exposure to television has harmful effects on children's cognitive development. Most studies that point to a negative correlation between hours of television watching and cognitive outcomes, fail to establish causality. Using the National Longitudinal Survey of Youth (NLSY) we study young children between 5 and 10 years of age during late 1990s and early 2000s. We find strong evidence of negative correlations between hours of television watched and cognitive test scores. However, once parent's characteristics and unobserved child characteristics are taken into account these correlations go away. We find that hours of television viewed per se do not have any measurable impact on children's test scores. Our results are robust to different model specifications and instrumental variable estimates. We conclude that despite the conventional wisdom and the ongoing populist movement, proactive policies to reduce children's television exposure are not likely to improve children's cognitive development and academic performance.  相似文献   

Impact of Accommodation Strategies on English Language Learners' Test Performance     

Jamal Abedi  Carol Lord  Carolyn Hofstetter  Eva Baker 《Educational Measurement》2000,19(3):16-26

How can we make effective accommodations for nonnative English speakers taking mathematics measures? What kinds of accommodations are useful and what kinds are not? Where does this research need to go in the future?  相似文献   

Performance of English Language Learners as a Subgroup in Large-Scale Assessment: Interaction of Research and Policy     

Jamal Abedi  Patricia Gándara 《Educational Measurement》2006,25(4):36-46

Factors that contribute to the performance gap between subgroups and mainstream students deserve special attention. Different subgroups are faced with different sets of challenges. To understand and control for factors leading to the performance gap between subgroups and mainstream students one must clearly understand the issues specific to each subgroup. This paper focuses on assessment and performance issues for English language learner (ELL) students as a subgroup. Identifying factors affecting the performance gap between ELL and non-ELL students may help gain insight into assessment issues for other subgroups of students as well as strengthen assessment of this group.  相似文献   

Perceived Level of Personal Control Over the Work Environment and Employee Satisfaction and Work Performance     

Sanaz Ahmadpoor Samani  Siti Zaleha Abdul Rasid  Saudah bt Sofian 《Performance Improvement》2015,54(9):28-35

The purpose of this article is to provide a review of background information regarding perceived level of personal control over the physical features of the work environment and its impact on individual satisfaction and outcomes. In today's business with the fast growth of technology, e‐market development, and innovative methods of communication, the workplace will continue to change rapidly. To control and accommodate these fast changes while sustaining or enhancing outcomes, organizations have increasingly turned to a model of work teams; therefore, employees’ skills in working within team environments has been emphasized. To guarantee that the work environment itself supports these new approaches of working, flexible workplaces are often suggested. Open‐plan offices offer more flexibility when compared to completely closed and private ones and they are considered to have more capabilities and are, therefore, highly valued in today's industry. Apart from its advantages, open‐plan office design does create some problems due to lack of personal control over the work environment, which can negatively affect employees’ satisfaction and performance. It is, therefore, important to emphasize the significance of personal control over the physical work environment and the impact of that on employees’ satisfaction and outcome.  相似文献   

Meeting the counseling needs of children with diabetes     

Jamal M. S. Yousef 《International journal for the advancement of counseling》1993,16(1):29-36

Juvenile diabetes mellitus is a major health problem which may present various physical, psychological, social and educational difficulties. This article illustrates the nature of this condition. Definition, incidence, etiology, clinical symptoms, and major later complications are briefly described. Psychological, social, and educational aspects of diabetes are discussed with recommendations for counselors.  相似文献   

Implications of Institutional Repositories on Contributors' Professional and Publishing Practices: A Survey     

Prachi Shukla  Abdul Mannan Khan 《International Information and Library Review》2013,45(3-4):125-136

An institutional repository is a system for dissemination and stewardship of the intellectual life and scholarship of an institution. It has become a new way for the institutions to contribute to the broader world of scholarship (Giesecke, 2011 Giesecke, J. (2011). Institutional repositories: Keys to success. Journal of Library Administration, 51(5–6), 529–542. Retrieved January 3, 2013, from http://digitalcommons.unl.edu/libraryscience/255[Taylor & Francis Online] , [Google Scholar]). In spite of the global recognition of institutional repositories as an open access scholarly communication channel, institutional repositories are still struggling with the problem of non-participation from contributors in developing countries like India. This study conveys the results of a survey conducted at a minority university of India. The study is an expression of the opinion of 542 faculty members and research scholars pertaining to the possible implications of institutional repositories on their professional and publishing practices. The study is undertaken to: Determine the level of awareness of institutional repository among contributors; identify the reasons for participation and non-participation of contributors; examine the implications of institutional repository on contributors professional and publishing practices; analyze the major obstacles/hindrances in the growth of an institutional repository; and suggest measures for better implementation and development of an institutional repository in future. With the help of the statistical techniques such as chi-square test and weighted mean the study resulted that the majority of the contributors are well aware about the concept of institutional repository, the majority of contributors have not deposited in an institutional repository so far, long term preservation of research materials is the first ranked reason for participation in an institutional repository, copyright and plagiarism concern is the main reason behind contributors’ non-participation in institutional repository, increased accessibility of research output is the major implication of the institutional repository on contributors professional practices, saved cost of publishing in a journal is the biggest implication of institutional repository on contributors publishing practices, and contributors demand more control on ownership, access and security in future for an institutional repository. This article is aimed at the institutions that report low-use and low-deposit repositories. It may be used to convince the contributors about the value of institutional repositories, importance of participating in an institutional repository and possible implications on their professional and publishing practices. The study is also intended at the management of the institutions to take notice of the contributors’ demands for future participation and develop policies accordingly for removing major barriers in the growth of institutional repositories and improving contributions and quality of content in the institutional repositories.  相似文献   

Resolving disputes about educational provision: a comparative perspective on special educational needs     

Suraiya Bte Abdul Hameed 《International Journal of Disability, Development & Education》2013,60(2):177-179

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From the Court to the Classroom: Opportunities for Engagement,Learning, and Identity in Basketball and Classroom Mathematics     

Na'ilah Suad Nasir  Victoria Hand 《学习科学杂志》2013,22(2):143-179

This study explored support for engagement in 2 settings: a high school basketball team and high school mathematics classrooms. Specifically, the study examined 3 aspects of these practices: (a) access to the domain, (b) opportunities to take on integral roles, and (c) opportunities for self-expression in the practice. Drawing on videotape and interview data from 2 African American high school students' participation in basketball and mathematics class, as well as interviews with players' teachers and coaches, this article analyzes how these 3 aspects of practices afforded differential engagement across settings. Findings indicated that the practice of basketball supported deep engagement as players had greater access to an understanding of the domain, were assigned and took up a unique role that was integral to the practice, and had opportunities to express themselves and feel competent. The high school mathematics classroom differentially afforded these opportunities, with 1 student taking them up and the other being unable to, and thus being less engaged. Potential implications of these 3 aspects of the practices for students' practice-linked identities and learning are discussed.  相似文献