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Proposing a New Design Approach for M-learning Applications
Al-Harrasi, H.,Al-Khanjari,Sarrab, M. 보안공학연구지원센터 2015 International Journal of Software Engineering and Vol.9 No.11
As Information and Communication Technologies (ICT) are developing frequently, new learning approaches have been introduced to facilitate teaching and learning processes. Mobile devices are growing in popularity and there has been an increasing interest in their potential as innovative tools for learning. Mobile learning or shortly (M-learning) is a new learning approach intending to use mobile devices such as laptops, smart phones and personal digital assistant (PDA) in learning process in any place and at any time. M-learning application needs to be designed in a way that considers the special features and constraints of mobile devices such as screen size, available storage, processor speed and battery life. This paper explores the existing design approaches for M-learning and highlights their main limitations. As a step forward in this direction, this paper also proposes a new design approach for M-learning applications focusing mainly on three main aspects: learner, learning content and technology. The approach consists of three phases: starting dimensions (SD) phase, M-learning Development (MLD) phase and Learning Content Design (LCD) phase. Finally, this paper provides a case study scenario to demonstrate the feasibility of the proposed approach.
Thermal performance investigation of enhanced receiver tube for concentrated solar collector
Mohammed Al-Harrasi,Afzal Husain,M. Zunaid Techno-Press 2022 Advances in energy research Vol.8 No.3
This study presents an experimental investigation of conventional and enhanced receiver tube performance for the application of a concentrated parabolic trough collector (CPC). The CPC system is fabricated and tested for the conventional and enhanced receiver tubes. The experiments were performed on both tubes for the change of flow rates. The temperature rise of the tube surface, as well as working fluid, were monitored for varying flow rates. The results were compared and discussed in view of enhanced CPC system performance. The results exhibited that the temperature rise of the working fluid passing through the tube was more in the case of the enhanced tube compared to the conventional receiver tube under the same flow rates.
Nizwaside: a new anticancer pregnane glycoside from the sap of Desmidorchis flava
Hidayat Hussain,Ahmed Al-Harrasi,Muhammad Adil Raees,Najeeb Ur Rehman,Ahmed Al-Rawahi,Rene´ Csuk,Husain Yar Khan,Ghulam Abbas,Mohammed Abdullah Al-Broumi,Ivan R. Green,Ali Elyassi,Talat Mahmood 대한약학회 2015 Archives of Pharmacal Research Vol.38 No.12
The sap from the succulent Desmidorchis flava (N.E.Br) Meve and Liede yielded a new pregnane glycoside, named nizwaside whose structure was established using 1D and 2D NMR techniques as well as mass spectrometry (ESIMS). Nizwaside was tested for anticancer, DPPH antioxidant, urease enzyme inhibition, a-glucosidase enzyme inhibition and acetylcholinesterase inhibition activities. Interestingly, nizwaside showed significant anti-proliferative effects on MDA MB231 breast cancer cells with an IC50 of 23.5 lg/ml. Moreover, nizwaside was more effective than Doxorubicin, a wellknown clinical anticancer drug, in suppressing MDA MB231 cell proliferation even at concentrations lower than that of Doxorubicin (75 lg/ml nizwaside vs. 100 lg/ml Doxorubicin). On the other hand, nizwaside showed relatively weak antioxidant activity with 15 % inhibition.
Abdul Latif Khan,Muhammad Waqas,강상모,Ahmed Al-Harrasi,Javid Hussain,Ahmed Al-Rawahi,Salima Al-Khiziri,Ihsan Ullah,Liaqat Ali,정희영,이인중 한국미생물학회 2014 The journal of microbiology Vol.52 No.8
Plant growth promoting endophytic bacteria have been identifiedas potential growth regulators of crops. Endophyticbacterium, Sphingomonas sp. LK11, was isolated from theleaves of Tephrosia apollinea. The pure culture of Sphingomonassp. LK11 was subjected to advance chromatographicand spectroscopic techniques to extract and isolate gibberellins(GAs). Deuterated standards of [17, 17-2H2]-GA4,[17, 17-2H2]-GA9 and [17, 17-2H2]-GA20 were used to quantifythe bacterial GAs. The analysis of the culture broth ofSphingomonas sp. LK11 revealed the existence of physiologicallyactive gibberellins (GA4: 2.97 ± 0.11 ng/ml) and inactiveGA9 (0.98 ± 0.15 ng/ml) and GA20 (2.41 ± 0.23). Theendophyte also produced indole acetic acid (11.23 ± 0.93μM/ml). Tomato plants inoculated with endophytic Sphingomonassp. LK11 showed significantly increased growth attributes(shoot length, chlorophyll contents, shoot, and rootdry weights) compared to the control. This indicated thatsuch phyto-hormones-producing strains could help in increasingcrop growth.
Ali, Amjad,Shahzad, Raheem,Khan, Abdul Latif,Halo, Boshera A.,Al-Yahyai, Rashid,Al-Harrasi, Ahmed,Al-Rawahi, Ahmed,Lee, In-Jung Informa UK (TaylorFrancis) 2017 Journal of plant interactions Vol.12 No.1
<P>The current study aimed to explore the endophytic bacterial diversity of Avicennia marina and the potential roles of these endophytes in counteracting saline conditions in tomato plants. Molecular analysis revealed strains from Paenibacillus, Bacillus, Microbacterium, Citrobacter, Lysinibacillus, Halomonas, Virgibacillus, Exiguobacterium, and Vibrio. However, Bacillus pumilus AM11 and Exiguobacterium sp. AM25 showed significantly higher growth in saline media. In response to salinity stress, tomato plants treated with AM11 and AM25 showed significantly higher (similar to 15-23%) biomass, photosynthetic rate and pigment accumulation compared to controls. Salinity-exposed plants had significantly reduced growth and increased (three-fold) lipid peroxidation, whilst glutathione, catalase, and peroxidase activities were significantly reduced. In contrast, AM11, AM25, and methionine improved these physiochemical attributes. The study concludes that the application of bacterial endophytes from plants growing in saline conditions can offer other plants similar stress-resistance potential. Such halophytic bacterial strains can be used to improve plant growth in saline conditions.</P>
Khan, Abdul Latif,Bilal, Saqib,Halo, Boshra Ahmed,Al-Harrasi, Ahmed,Khan, Abdur Rahim,Waqas, Muhammad,Al-Thani, Ghanim Salim,Al-Amri, Issa,Al-Rawahi, Ahmed,Lee, In-Jung Informa UK (TaylorFrancis) 2017 Journal of plant interactions Vol.12 No.1
<P>Current study aimed at exploring the diversity of bacterial endophytes with Boswellia sacra and their role in copper (Cu) stress to tomato plants. Bacterial endophytes were belonged to Bacillus, Rhizobium and Paenibacillus, which were screened against Cu (0=10 mM) stress to dwarf and normal rice seeds. Among strains, Bacillus amyloliquefaciens BSL16 showed significantly higher bioremediation potential by accumulating high Cu and promoting growth of rice seeds. B. amyloliquefaciens BSL16 significantly increased growth of tomato plants during 2.5 mM Cu stress. Active colonization of BSL16 reduced the accumulation of Cu in leaf, shoot, and root, and in parallel up-regulated total protein contents in leaf and stem. Glutathione peroxidase and reduced glutathione contents were significantly higher and lipid peroxidation was lower in endophyte-treated tomato plants as compared to Cu treatment. The current results conclude that application of metal bio-accumulating bacteria can help in improving the plant growth of tomato plants during Cu stress.</P>