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Muhammad Waqas Yoon-Ha Kim Abdul Latif Khan Raheem Shahzad Sajjad Asaf Muhammad Hamayun Sang-Mo Kang Muhammad Aaqil Khan In-Jung Lee 《Journal of Zhejiang University. Science. B》2017,18(2):109-124
We studied the effects of hardwood-derived biochar (BC) and the phytohormone-producing endophyte Galactomyces geotrichum WLL1 in soybean (Glycine max (L.) Merr.) with respect to basic, macro- and micronutrient uptakes and assimilations, and their subsequent effects on the regulation of functional amino acids, isoflavones, fatty acid composition, total sugar contents, total phenolic contents, and 1,1-diphenyl-2-picrylhydrazyl (DPPH)-scavenging activity. The assimilation of basic nutrients such as nitrogen was up-regulated, leaving carbon, oxygen, and hydrogen unaffected in BC+G. geotrichum-treated soybean plants. In comparison, the uptakes of macro- and micronutrients fluctuated in the individual or co-application of BC and G. geotrichum in soybean plant organs and rhizospheric substrate. Moreover, the same attribute was recorded for the regulation of functional amino acids, isoflavones, fatty acid composition, total sugar contents, total phenolic contents, and DPPH-scavenging activity. Collectively, these results showed that BC+G. geotrichum-treated soybean yielded better results than did the plants treated with individual applications. It was concluded that BC is an additional nutriment source and that the G. geotrichum acts as a plant biostimulating source and the effects of both are additive towards plant growth promotion. Strategies involving the incorporation of BC and endophytic symbiosis may help achieve eco-friendly agricultural production, thus reducing the excessive use of chemical agents. 相似文献
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Shahzad Fakhar Xiu GuoYi Khan Imran Shahbaz Muhammad Riaz Muhammad Usman Abbas Adnan 《Asia Pacific Education Review》2020,21(1):121-141
Asia Pacific Education Review - In the provision of massive open online courses (MOOCs), cloud computing services enable students to synchronize their study materials anywhere, anytime, and using... 相似文献
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A. Zulfqar M. Valcke G. Devos M. Tuytens A. Shahzad 《Asia Pacific Education Review》2016,17(1):147-159
The goal of this study is to examine differences in leadership and decision-making practices in public and private universities in Pakistan, with a focus on transformational leadership (TL) and participative decision-making (PDM). We conducted semi-structured interviews with 46 deans and heads of department from two public and two private universities in Pakistan. Our findings indicate that leadership and decision-making practices are different in public and private universities. While differences were observed in all six types of TL-behaviour, the following three approaches emerged to be crucial in both public and private universities: (1) articulating a vision, (2) fostering the acceptance of group goals, and (3) high-performance expectations. In terms of PDM, deans and heads of department in public and private universities adopt a collaborative approach. However, on a practical level this approach is limited to teacher- and student-related matters. Overall, our findings suggest that the leadership and decision-making practices in Pakistani public and private universities are transformational and participative in nature. 相似文献
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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
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Abdul Latif Khan Syed Abdullah Gilani Muhammad Waqas Khadija Al-Hosni Salima Al-Khiziri Yoon-Ha Kim Liaqat Ali Sang-Mo Kang Sajjad Asaf Raheem Shahzad Javid Hussain In-Jung Lee Ahmed Al-Harrasi 《Journal of Zhejiang University. Science. B》2017,18(2):125-137
Medicinal plants have been used by marginal communities to treat various ailments. However, the potential of endophytes within these bio-prospective medicinal plants remains unknown. The present study elucidates the endophytic diversity of medicinal plants (Caralluma acutangula, Rhazya stricta, and Moringa peregrina) and the endophyte role in seed growth and oxidative stress. Various organs of medicinal plants yielded ten endophytes, which were identified as Phoma sp. (6 isolates), Alternaria sp. (2), Bipolaris sp. (1), and Cladosporium sp. (1) based on 18S rDNA sequencing and phylogenetic analysis. The culture filtrates (CFs; 25%, 50%, and 100% concentrations) from these endophytes were tested against the growth of normal and dwarf mutant rice lines. Endophytic CF exhibited dose-dependent growth stimulation and suppression effects. CF (100%) of Phoma sp. significantly increased rice seed germination and growth compared to controls and other endophytes. This growth-promoting effect was due to the presence of indole acetic acid in endophytic CF. The gas chromatography/mass spectrometry (GC/MS) analysis showed the highest indole acetic acid content ((54.31±0.21) μmol/L) in Bipolaris sp. In addition, the isolate of Bipolaris sp. exhibited significantly higher radical scavenging and anti-lipid peroxidation activity than the other isolates. Bipolaris sp. and Phoma sp. also exhibited significantly higher flavonoid and phenolic contents. The medicinal plants exhibited the presence of bio-prospective endophytic strains, which could be used for the improvement of crop growth and the mitigation of oxidative stresses. 相似文献
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Many technology studies have conceptualized transitions between technological generations as a series of S-curve performance improvements over time. Surprisingly, the interregnum between successive generations has received little attention. To understand what happens in the interregnum, we study the transition from 2G to 3G in mobile communications. Our study identifies the presence of forces for both change and continuity across heterogeneous social and technical elements shaping an uneven transition between 2G and 3G mobile communications technology platforms. Unanticipated misalignments and asynchronies that emerged during the journey shifted the incentives of the various actors involved to participate. Based on these observations, we offer several conjectures as to the dynamics that can give rise to temporal discords during inter-generational technological transitions. 相似文献
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When radical innovations impact an industry, established incumbents are sometimes displaced by new challengers, yet at other times, survive and prosper. What are the factors that influence these possible outcomes? Extensive as the studies are in providing insights into incumbent-challenger dynamics (ICD), the fragmented nature of the literature and the isolated treatment of various constructs at a particular level of analysis, merit a review and analysis. We (1) identify, collate and analyse several constructs from three categories; the industry, the firm and the challenge, (2) discuss the interactions among these constructs and (3) show that incumbent failure or success can be better understood when these constructs are concurrently analysed. We derive several propositions for stimulating research and develop a holistic multi-level framework for understanding incumbent-challenger dynamics. We pull together strategic management theories at the industry level with those at the organizational and inter-organizational levels in the context of disruptive innovations. We contribute by bringing in the challenge dimension across these levels to inform whether an innovation is disruptive in its effects, not just ex post but also ex ante. For illustrative purposes and to concretize our arguments, we draw on both primary data from the Dutch television industry and archival data from four episodes of disruptive innovations. 相似文献
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Richard McCreadie Shahzad Rajput Ian Soboroff Craig Macdonald Iadh Ounis 《Information processing & management》2019,56(5):1815-1836
Timeline generation systems are a class of algorithms that produce a sequence of time-ordered sentences or text snippets extracted in real-time from high-volume streams of digital documents (e.g. news articles), focusing on retaining relevant and informative content for a particular information need (e.g. topic or event). These systems have a range of uses, such as producing concise overviews of events for end-users (human or artificial agents). To advance the field of automatic timeline generation, robust and reproducible evaluation methodologies are needed. To this end, several evaluation metrics and labeling methodologies have recently been developed - focusing on information nugget or cluster-based ground truth representations, respectively. These methodologies rely on human assessors manually mapping timeline items (e.g. sentences) to an explicit representation of what information a ‘good’ summary should contain. However, while these evaluation methodologies produce reusable ground truth labels, prior works have reported cases where such evaluations fail to accurately estimate the performance of new timeline generation systems due to label incompleteness. In this paper, we first quantify the extent to which the timeline summarization test collections fail to generalize to new summarization systems, then we propose, evaluate and analyze new automatic solutions to this issue. In particular, using a depooling methodology over 19 systems and across three high-volume datasets, we quantify the degree of system ranking error caused by excluding those systems when labeling. We show that when considering lower-effectiveness systems, the test collections are robust (the likelihood of systems being miss-ranked is low). However, we show that the risk of systems being mis-ranked increases as the effectiveness of systems held-out from the pool increases. To reduce the risk of mis-ranking systems, we also propose a range of different automatic ground truth label expansion techniques. Our results show that the proposed expansion techniques can be effective at increasing the robustness of the TREC-TS test collections, as they are able to generate large numbers missing matches with high accuracy, markedly reducing the number of mis-rankings by up to 50%. 相似文献
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Previous studies indicate that individuals with borderline personality disorder come from families marked by high levels of psychopathology as well as dysfunctional parenting styles—themes that tend to engender negative attitudes toward parents. However, we are not aware of any studies that have examined perceptions of parenting quality and borderline personality symptoms in a clinical but non-psychiatric population—the purpose of the present study. Using a cross-sectional self-report survey methodology in a sample of internal medicine outpatients, we examined participants’ perceptions of the quality of parental caretaking using a one-item assessment, and examined borderline personality symptomatology using two measures. Ratings of the quality of parental care were statistically significantly inversely correlated with scores on both measures of borderline personality symptomatology. After controlling for the number of caretakers during childhood, the observed statistical relationships remained statistically significant. In this primary care sample, participants with borderline personality symptomatology perceived parents more negatively than those without such symptomatology. 相似文献