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Pseudomonas veronii KJ mitigates flood stress-associated damage in Sesamum indicum L.
Sajid Ali,Muhammad Aaqil Khan,김원찬 한국응용생명화학회 2018 Applied Biological Chemistry (Appl Biol Chem) Vol.61 No.5
Physiological characteristics of terrestrial plants are severely affected by waterlogging stress, leading to low photochemical efficiency of leaves and retarded growth and development. Plant growth-promoting rhizobacteria contain the acdS gene, which encodes for the enzyme 1-aminocyclopropane-1-carboxylate (ACC) deaminase. ACC deaminase cleaves the substrate ACC to produce aketobutyrate and ammonia and mitigates the adverse effect of prolonged water stress. The aim of this study was to characterize ACC deaminase-producing rhizobacteria and evaluate their effects on sesame (Sesamum indicum L.) under waterlogging stress condition. The rhizobacterium Pseudomonas KJ was characterized on the basis of sequencing of the partial 1501 bp fragment of 16S rDNA amplicon and confirmed as Pseudomonas veronii KJ. ACCsupplemented minimal medium revealed the phenotypic identification of acdS gene. The nucleotide sequence (1001 bp) of ACC deaminase gene of P. veronii KJ was also confirmed. We used P. veronii KJ as a bioinoculant in waterlogging stress and monitored the growth and developmental characteristics of sesame plants, including leaf chlorophyll fluorescence signals, concentration of chlorophyll, root and shoot length, and fresh and dry biomass in stressed versus unstressed plants. Plants treated with P. veronii KJ significantly (P B 0.05) mitigated the waterlogging stress-related damage. Thus, the rhizobacterium Pseudomonas veronii KJ may be considered as a commendable addition to the consortium of beneficial microbes for its ability to reduce waterlogging stress-related damage in sesame plants.
Ali Sajid,Yusop Zulkornain,Kaliappan Shivee Ranjanee,Chin Lee 한국국제경제학회 2020 International Economic Journal Vol.34 No.4
This study aims to analyze the impact of trade openness on unemployment in labor-abundant and capital-abundant countries of Organization of Islamic Cooperation (OIC) by taking the data from 1991 to 2018. A new technique quantile-on-quantile (QQ) is applied to show how quantiles of trade openness asymmetrically affect the quantiles of unemployment by providing an appropriate framework to capture the overall dependence structure. 8 out of 10 capital-abundant countries show a positive association between trade openness and unemployment, while 7 out of 10 labor-abundant countries indicate a negative effect of trade openness on unemployment. Hence, the majority of selected labor-abundant and capital-abundant countries are validating Heckscher-Ohlin theory of international trade. The results show that the asymmetric intensity of trade-induced unemployment varies with countries at both bottom and upper quantiles of the distribution of data that require individual attention in postulating the policies related to trade and unemployment in OIC countries.
Highly visible light active Ag@ZnO nanocomposites synthesized by gel-combustion route
Sajid Ali Ansari,조무환,칸모하마드만숩,이진태 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Highly visible light active 1% and 3% Ag@ZnO nanocomposites were synthesized via a gel combustion route using citric acid as a fuel. The formation of the nanocomposites with enhanced properties was confirmed using a range of characterization techniques, photocatalysis and photoelectrochemical studies. Compared to the pristine ZnO nanoparticles, the Ag@ZnO nanocomposites exhibited enhanced visible light photocatalytic activity for the degradation of methylene blue and photoelectrochemical response. A mechanism was proposed to account for the photocatalytic activities of the Ag@ZnO nanocomposite that showed the surface plasmon resonance (SPR) of Ag is an effective way of enhancing the visible light photocatalytic activities.
Ali, Sajid,Lee, Sang-Moon,Jang, Choon-Man Elsevier 2018 Energy conversion and management Vol.171 No.-
<P><B>Abstract</B></P> <P>Recently, small scale H-Darrieus vertical axis wind turbines (VAWTs) have got great attention of researchers and wind turbine manufacturers due to their application at roof-tops of residential buildings. They are generally preferred over horizontal axis wind turbines (HAWTs) in terms of lower levels of noise production, operation at low wind speeds and lower manufacturing costs. But the main problem with such wind turbines is their low efficiency, which is mainly due to the complex flow around the turbine blades. It is of great importance to first fully understand the nature of complex aerodynamics associated with such wind turbines. Present study analyzes the instantaneous tangential velocity (ITV) and its impact on the power performance of H-Darrieus wind turbine at five different tip speed ratios (TSRs) i.e. 1–5. Computational models based on large eddy simulations (LES) have been developed using commercial software SC/Tetra V12. Throughout the numerical simulation, it is found that ITV of single blade has a negative value (reverse rotation) for TSRs 1–3 when the azimuth position ranges from 80° to 140°, whereas it has positive values during the remainder of the rotation for the mentioned TSRs. Furthermore, the magnitude of the negative ITV for a single blade was found to increase from TSR 1 to 3; the maximum value of the negative peak is equal to approximately −17.2 m/s while at the azimuth position of 110° for blade number 1 at TSR 3. On the other hand, no negative value of ITV is found for any of the three blades during a complete rotation at relatively higher values of TSRs i.e. 4 and 5. The possible physical reasons behind this behavior have been explained through aerodynamic forces and 2D color contours of important parameters, such as vorticity and static pressure. Finally, a discussion has been included in the final section of this paper explaining how negative ITV affects the power performance of H-Darrieus wind turbines. The current CFD model has been compared and validated with experimental data.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Large eddy simulation (LES) used for an H-Darrieus wind turbine. </LI> <LI> Impact of instantaneous tangential velocity on the power performance of H-rotor. </LI> <LI> Unstable aerodynamic drag causes the reverse rotation of the rotor at lower TSRs. </LI> <LI> Power coefficient drops from 0.2294 at TSR 5, to a very low value of 0.0091 at TSR 1. </LI> </UL> </P>
Foreign Capital Inflows and Stock Market Development in Pakistan
Ali SAJID,Muhammad Arsalan HASHMI,A,ABDULLAH,Muhammad Amin HASSAN 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.6
The study examines how foreign capital inflows affect stock market development in Pakistan for the period from July 2008 to June 2018. Several components of foreign capital inflows were used for empirical analysis, namely, foreign direct investment, foreign portfolio investment, and remittances. Further, market capitalization was used as a proxy for stock market development. The study uses an ARDL model for examining the long-run and short-run relationships between variables. We also analyze the bi-directional causality between the variables through the Granger causality test. Further, the presence of structural breaks was analyzed through the CUSUM and CUSUM Square test. The results suggest that in the long run, remittances have a positive and significant relationship with stock market development. However, foreign direct investment, foreign portfolio investment, and USD-PKR exchange rate do not have a significant impact on stock market development. The results also suggest that in the short run there is a negative relationship between FDI, USD-PKR exchange rate and market capitalization. Contrarily, we found a positive relationship between FPI and market capitalization. The results of Granger causality test suggest that remittances and USD-PKR exchange rate have a causal relationship with stock market development. Finally, we found no evidence of structural breaks in the dataset.