500 results on '"Ahmed, S. M."'
Search Results
2. Emotion Analysis on EEG Signal Using Machine Learning and Neural Network
- Author
-
Ahmed, S. M. Masrur and Sabur, Eshaan Tanzim
- Subjects
Electrical Engineering and Systems Science - Signal Processing ,Computer Science - Artificial Intelligence ,Computer Science - Human-Computer Interaction - Abstract
Emotion has a significant influence on how one thinks and interacts with others. It serves as a link between how a person feels and the actions one takes, or it could be said that it influences one's life decisions on occasion. Since the patterns of emotions and their reflections vary from person to person, their inquiry must be based on approaches that are effective over a wide range of population regions. To extract features and enhance accuracy, emotion recognition using brain waves or EEG signals requires the implementation of efficient signal processing techniques. Various approaches to human-machine interaction technologies have been ongoing for a long time, and in recent years, researchers have had great success in automatically understanding emotion using brain signals. In our research, several emotional states were classified and tested on EEG signals collected from a well-known publicly available dataset, the DEAP Dataset, using SVM (Support Vector Machine), KNN (K-Nearest Neighbor), and an advanced neural network model, RNN (Recurrent Neural Network), trained with LSTM (Long Short Term Memory). The main purpose of this study is to improve ways to improve emotion recognition performance using brain signals. Emotions, on the other hand, can change with time. As a result, the changes in emotion over time are also examined in our research.
- Published
- 2023
3. Biological Control of Tomato Bacterial Leaf Spots and Its Impact on Some Antioxidant Enzymes, Phenolic Compounds, and Pigment Content
- Author
-
Asmaa H. Akila, Mohamed A. S. Ali, Ahmed M. Khairy, Ahmed S. M. Elnahal, Haifa E. Alfassam, Hassan A. Rudayni, Fatima A. Jaber, and Mohamed R. A. Tohamy
- Subjects
biocontrol agents ,culture filtrate ,Pseudomonas syringae ,tomato bacterial spot and speck ,Xanthomonas spp. ,Biology (General) ,QH301-705.5 - Abstract
Tomato bacterial spots, caused by Xanthomonas campestris pv. vesicatoria (Xcv1) and X. euvesicatoria (Xe2), as well as bacterial specks, caused by two strains of Pseudomonas syringae pv. tomato (Pst1 and Pst2), represent significant threats to tomato production in the El-Sharkia governorate, often resulting in substantial yield losses. The objective of this study was to evaluate the efficacy of various biocontrol culture filtrates, including bacteria and fungi agents, in managing the occurrence and severity of these diseases, while also monitoring physiological changes in tomato leaves, including antioxidant enzymes, phenolics, and pigment content. The culture filtrates from examined Trichoderma species (T. viride, T. harzianum, and T. album), as well as the tested bacteria (Bacillus subtilis, Pseudomonas fluorescens, and Serratia marcescens) at concentrations of 25%, 50%, and 100%, significantly inhibited the proliferation of pathogenic bacteria In vitro. For the In vivo experiments, we used specific doses of 5 mL of spore suspension per plant for the fungal bioagents at a concentration of 2.5 × 107 spores/mL. The bacterial bioagents were applied as a 10 mL suspension per plant at a concentration of 1 × 108 CFU/mL. Spraying the culture filtrates of the tested bioagents two days before infection In vivo significantly reduced disease incidence and severity. Trichoderma viride exhibited the highest efficacy among the fungal bioagents, followed by T. harzianum and T. album. Meanwhile, the culture filtrate of B. subtilis emerged as the most potent among the bacterial bioagents, followed by P. fluorescens. Furthermore, applying these culture filtrates resulted in elevated levels of chitinase, peroxidase, and polyphenol oxidase activity. This effect extended to increased phenol contents, as well as chlorophyll a, chlorophyll b, and carotenoids in sprayed tomato plants compared to the control treatment. Overall, these findings underscore the potential of these biocontrol strategies to effectively mitigate disease incidence and severity while enhancing plant defense mechanisms and physiological parameters, thus offering promising avenues for sustainable disease management in tomato production.
- Published
- 2024
- Full Text
- View/download PDF
4. An efficient computational scheme for solving coupled time-fractional Schrödinger equation via cubic B-spline functions.
- Author
-
Afzaal Mubashir Hayat, Muhammad Abbas, Homan Emadifar, Ahmed S M Alzaidi, Tahir Nazir, and Farah Aini Abdullah
- Subjects
Medicine ,Science - Abstract
The time fractional Schrödinger equation contributes to our understanding of complex quantum systems, anomalous diffusion processes, and the application of fractional calculus in physics and cubic B-spline is a versatile tool in numerical analysis and computer graphics. This paper introduces a numerical method for solving the time fractional Schrödinger equation using B-spline functions and the Atangana-Baleanu fractional derivative. The proposed method employs a finite difference scheme to discretize the fractional derivative in time, while a θ-weighted scheme is used to discretize the space directions. The efficiency of the method is demonstrated through numerical results, and error norms are examined at various values of the non-integer parameter, temporal directions, and spatial directions.
- Published
- 2024
- Full Text
- View/download PDF
5. A dynamical behavior of the coupled Broer-Kaup-Kupershmidt equation using two efficient analytical techniques.
- Author
-
Rimsha Ansar, Muhammad Abbas, Homan Emadifar, Tahir Nazir, and Ahmed S M Alzaidi
- Subjects
Medicine ,Science - Abstract
The aim of the present study is to identify multiple soliton solutions to the nonlinear coupled Broer-Kaup-Kupershmidt (BKK) system, including beta, conformable, local-fractional, and M-truncated derivatives. The coupled Broer-Kaup-Kupershmidt system is employed for modelling nonlinear wave evolution in mathematical models of fluid dynamics, plasmic, optical, dispersive, and nonlinear long-gravity waves. The travelling wave solutions to the above model are found using the Unified and generalised Bernoulli sub-ODE techniques. By modifying certain parameter values, we may create bright soliton, squeezed bell-shaped wave, expanded v-shaped soliton, W-shaped wave, singular soliton, and periodic solutions. The four distinct kinds of derivatives are compared quite effectively using 2D line graphs. Also, contour plots and 3D graphics are given by using Mathematica 10. Lastly, any pair of propagating wave solutions has symmetrical geometrical forms.
- Published
- 2024
- Full Text
- View/download PDF
6. Xeno-Free 3D Bioprinted Liver Model for Hepatotoxicity Assessment
- Author
-
Ahmed S. M. Ali, Johanna Berg, Viola Roehrs, Dongwei Wu, Johannes Hackethal, Albert Braeuning, Lisa Woelken, Cornelia Rauh, and Jens Kurreck
- Subjects
3D bioprinting ,xeno-free ,liver model ,HuH-7 cell line ,chemically defined media ,FBS-free ,Biology (General) ,QH301-705.5 ,Chemistry ,QD1-999 - Abstract
Three-dimensional (3D) bioprinting is one of the most promising methodologies that are currently in development for the replacement of animal experiments. Bioprinting and most alternative technologies rely on animal-derived materials, which compromises the intent of animal welfare and results in the generation of chimeric systems of limited value. The current study therefore presents the first bioprinted liver model that is entirely void of animal-derived constituents. Initially, HuH-7 cells underwent adaptation to a chemically defined medium (CDM). The adapted cells exhibited high survival rates (85–92%) after cryopreservation in chemically defined freezing media, comparable to those preserved in standard medium (86–92%). Xeno-free bioink for 3D bioprinting yielded liver models with high relative cell viability (97–101%), akin to a Matrigel-based liver model (83–102%) after 15 days of culture. The established xeno-free model was used for toxicity testing of a marine biotoxin, okadaic acid (OA). In 2D culture, OA toxicity was virtually identical for cells cultured under standard conditions and in CDM. In the xeno-free bioprinted liver model, 3-fold higher concentrations of OA than in the respective monolayer culture were needed to induce cytotoxicity. In conclusion, this study describes for the first time the development of a xeno-free 3D bioprinted liver model and its applicability for research purposes.
- Published
- 2024
- Full Text
- View/download PDF
7. The role of zooplankton in the pelagic food webs of tropical lakes
- Author
-
Al-Budeiri, Ahmed S. M.
- Subjects
zooplankton ,pelagic food webs ,Cyanobacteria ,tropical saline lakes ,thesis - Abstract
There is a general paucity of studies concerning trophic interactions between zooplankton and Cyanobacteria, and about the general role which zooplankton play in pelagic food webs in tropical saline lakes. Although the relative importance of allochthonous and autochthonous carbon resources to the diet of zooplankton in temperate lakes is well understood, significant knowledge gaps remain in tropical systems. This thesis addresses three principal questions: (1) What are the principal trophic interactions between zooplankton and Cyanobacteria in tropical lakes, with a specific focus on the lakes of the East African Rift Valley?; (2) Is there potential for competition between zooplankton and lesser flamingos in the Rift Valley lakes?; (3) What is the relative importance of allochthonous versus autochthonous carbon sources for aquatic consumers in tropical lakes? These questions were answered by analysing the compositions and trophic interactions in the pelagic food webs of four contrasting East African lakes (Naivasha, Baringo, Bogoria and Sonachi). The lakes were sampled over two campaigns in different seasons. The planktonic compositions and size distributions were assessed by microscopic identification of individual planktonic taxa. Fish and flamingos were also sampled. The trophic levels and potential dietary interactions of each identified taxa were then evaluated using natural abundance stable isotope analyses (δ13C and δ15N). The potential contribution of other carbon sources, such as terrestrial particulate organic carbon, was also assessed. In Chapter 3, observations from Lake Sonachi suggest that the pico-alga Synechococcus sp. was the dominant food item for the principal zooplankton taxon (the large calanoid Lovenula sp.). This finding differs from reports in other in tropical lakes which had suggested that large calanoids mainly consume colonies of Microcystis sp. The findings from Lake Bogoria, presented in Chapter 4, suggest a pronounced seasonality in the occurrence of Moina sp. and Cyclotella sp. This was predominantly a consequence of lake level rise and associated freshening during the wet season. These organisms do not appear to be utilised as a significant food source by flamingos in this lake. This suggests that seasonal shifts in the planktonic food web structure are not beneficial for flamingos in this lake. The results also suggest that rotifers may compete with flamingos for their main food item, the Cyanobacterium Arthrospira sp. In Chapter 5, stable isotope abundance and C/N ratio data from Lakes Baringo and Naivasha suggest that pelagic zooplankton in both lakes were largely dependent on autochthonous carbon in both sampling seasons, despite potentially large catchment sediment fluxes. This challenges previous suggestions that allochthonous carbon is an important basal resource for pelagic food webs in many lakes. Such assumptions, as derived from temperate lake systems may not always apply to tropical lake systems, as sampled in this study.
- Published
- 2021
- Full Text
- View/download PDF
8. Exploring biochar and fishpond sediments potential to change soil phosphorus fractions and availability
- Author
-
Mohsin Mahmood, Yunting Wang, Waqas Ahmed, Sajid Mehmood, Anam Ayyoub, Ahmed S. M. Elnahal, Weidong Li, and Xin Zhan
- Subjects
fishpond sediments ,metal contents ,biochar ,P uptake ,phosphorus fractions ,Tiessen and Moir fractionation scheme ,Plant culture ,SB1-1110 - Abstract
Phosphorus (P) availability in soil is paradoxical, with a significant portion of applied P accumulating in the soil, potentially affecting plant production. The impact of biochar (BR) and fishpond sediments (FPS) as fertilizers on P fixation remains unclear. This study aimed to determine the optimal ratio of BR, modified biochar (MBR), and FPS as fertilizer replacements. A pot experiment with maize evaluated the transformation of P into inorganic (Pi) and organic (Po) fractions and their contribution to P uptake. Different percentages of FPS, BR, and MBR were applied as treatments (T1–T7), T1 [(0.0)], T2 [FPS (25.0%)], T3 [FPS (25.0%) + BR (1%)], T [FPS (25%) +MBR (3%)], T5 [FPS (35%)], T6 [FPS (35%) +BR (1%)], and T7 [FPS (35%) + MBR (1%)]. Using the modified Hedley method and the Tiessen and Moir fractionation scheme, P fractions were determined. Results showed that various rates of MBR, BR, and FPS significantly increased labile and moderately labile P fractions (NaHCO3-Pi, NaHCO3-Po, HClD-Pi, and HClC-Pi) and residual P fractions compared with the control (T1). Positive correlations were observed between P uptake, phosphatase enzyme activity, and NaHCO3-Pi. Maximum P uptake and phosphatase activity were observed in T6 and T7 treatments. The addition of BR, MBR, and FPS increased Po fractions. Unlike the decline in NaOH-Po fraction, NaHCO3-Po and HClc-Po fractions increased. All Pi fractions, particularly apatite (HClD-Pi), increased across the T1–T7 treatments. HClD-Pi was the largest contributor to total P (40.7%) and can convert into accessible P over time. The T5 treatment showed a 0.88% rise in residual P. HClD-Pi and residual P fractions positively correlated with P uptake, phosphatase activity, NaOH-Pi, and NaOH-Po moderately available fractions. Regression analysis revealed that higher concentrations of metals such as Ca, Zn, and Cr significantly decreased labile organic and inorganic P fractions (NaHCO3-Pi, R2 = 0.13, 0.36, 0.09) and their availability (NaHCO3-Po, R2 = 0.01, 0.03, 0.25). Excessive solo BR amendments did not consistently increase P availability, but optimal simple and MBR increased residual P contents in moderately labile and labile forms (including NaOH-Pi, NaHCO3-Pi, and HClD-Pi). Overall, our findings suggest that the co-addition of BR and FPS can enhance soil P availability via increasing the activity of phosphatase enzyme, thereby enhancing plant P uptake and use efficiency, which eventually maintains the provision of ecosystem functions and services.
- Published
- 2023
- Full Text
- View/download PDF
9. Biological Control of Tomato Bacterial Leaf Spots and Its Impact on Some Antioxidant Enzymes, Phenolic Compounds, and Pigment Content
- Author
-
Akila, Asmaa H., primary, Ali, Mohamed A. S., additional, Khairy, Ahmed M., additional, Elnahal, Ahmed S. M., additional, Alfassam, Haifa E., additional, Rudayni, Hassan A., additional, Jaber, Fatima A., additional, and Tohamy, Mohamed R. A., additional
- Published
- 2024
- Full Text
- View/download PDF
10. Supramolecular Structure, Hirshfeld Surface Analysis, Morphological Study and DFT Calculations of the Triphenyltetrazolium Cobalt Thiocyanate Complex
- Author
-
Essam A. Ali, Rim Bechaieb, Rashad Al-Salahi, Ahmed S. M. Al-Janabi, Mohamed W. Attwa, and Gamal A. E. Mostafa
- Subjects
supramolecular structure ,crystal structure ,Hirshfeld surface analysis ,void analysis ,morphologies ,DFT calculations ,Crystallography ,QD901-999 - Abstract
Polymorphism is a prevalent occurrence in pharmaceutical solids and demands thorough investigation during product development. This paper delves into the crystal growth and structure of a newly synthesized polymorph (TPT)2[CoII(NCS)4], (1), where TPT is triphenyl tetrazolium. The study combines experimental and theoretical approaches to elucidate the 3D framework of the crystal structure, characterized by hydrogen-bonded interactions between (TPT)+ cations and [Co(NCS)4]2− anions. Hirshfeld surface analysis, along with associated two-dimensional fingerprints, is employed to comprehensively investigate and quantify intermolecular interactions within the structure. The enrichment ratio is calculated for non-covalent contacts, providing insight into their propensity to influence crystal packing interactions. Void analysis is conducted to predict the mechanical behavior of the compound. Utilizing Bravais-Friedel, Donnay-Harker (BFDH), and growth morphology (GM) techniques, the external morphology of (TPT)2[CoII(NCS)4] is predicted. Experimental observations align well with BFDH predictions, with slight deviations from the GM model. Quantum computational calculations of the synthesized compounds is performed in the ground state using the DFT/UB3LYP level of theory. These calculations assess the molecule’s stability and chemical reactivity, including the computation of the HOMO-LUMO energy difference and other chemical descriptors. The study provides a comprehensive exploration of the newly synthesized polymorph, shedding light on its crystal structure, intermolecular interactions, mechanical behavior, and external morphology, supported by both experimental and computational analyses.
- Published
- 2023
- Full Text
- View/download PDF
11. Synthesis, characterization and properties of nanocomposites based on poly(vinyl chloride)/carbon nanotubes–silver nanoparticles
- Author
-
Sadek, E M, Ahmed, S M, Mansour, N A, Abd-El-Messieh, S L, and El-Komy, D
- Published
- 2023
- Full Text
- View/download PDF
12. Development of Lepidium sativum Extracts/PVA Electrospun Nanofibers as Wound Healing Dressing
- Author
-
Asmaa A. Amer, Reda S. Mohammed, Yasmein Hussein, Ahmed S. M. Ali, and Ashraf A. Khalil
- Subjects
Chemistry ,QD1-999 - Published
- 2022
- Full Text
- View/download PDF
13. Man vs. machine: Automated bioink mixing device improves reliability and reproducibility of bioprinting results compared to human operators
- Author
-
Wu, Dongwei, primary, Pang, Shumin, additional, Röhrs, Viola, additional, Berg, Johanna, additional, Ali, Ahmed S. M., additional, Mei, Yikun, additional, Ziersch, Mathias, additional, Tolksdorf, Beatrice, additional, and Kurreck, Jens, additional
- Published
- 2024
- Full Text
- View/download PDF
14. Xeno-Free 3D Bioprinted Liver Model for Hepatotoxicity Assessment
- Author
-
Ali, Ahmed S. M., primary, Berg, Johanna, additional, Roehrs, Viola, additional, Wu, Dongwei, additional, Hackethal, Johannes, additional, Braeuning, Albert, additional, Woelken, Lisa, additional, Rauh, Cornelia, additional, and Kurreck, Jens, additional
- Published
- 2024
- Full Text
- View/download PDF
15. Association of interferon gamma inducible protein-10, monocyte chemoattractant protein-1, macrophage inflammatory protein-1 alpha, interleukin-6, and rs12252 single nucleotide polymorphism of interferon-induced transmembrane protein-3 gene with the severity of COVID-19 infection
- Author
-
Mulla, Shafia, Molla, Md.Maruf Ahmed, Ahmed, S. M. Ali, Akhtaruzzaman, A. K. M., Saleh, Ahmed Abu, and Anwar, Shaheda
- Published
- 2022
- Full Text
- View/download PDF
16. Thiourea Derivative Metal Complexes: Spectroscopic, Anti-Microbial Evaluation, ADMET, Toxicity, and Molecular Docking Studies
- Author
-
Ahmed T. F. Al-Halbosy, Adnan A. Hamada, Ahmed S. Faihan, Abdulrahman M. Saleh, Tarek A. Yousef, Mortaga M. Abou-Krisha, Mona H. Alhalafi, and Ahmed S. M. Al-Janabi
- Subjects
thiourea ,morpholine ,anti-cancer ,molecular docking ,DFT ,Inorganic chemistry ,QD146-197 - Abstract
The treatment of N-Phenylmorpholine-4-carbothioamide (HPMCT) with bivalent metal ions in a 2:1 mol ratio without a base present affords [MCl2(κ1S-HPMCT)2] {M = Cu(1), Pd(2), Pt(3), and Hg(4)} in a good yield. Furthermore, the reaction of two equivalents of HPMCT and one equivalent of bivalent metal ions in the presence of Et3N has afforded [M(κ2S,N-PMCT)2] {M = Ni(5), Cu(6), Pd(7), Pt(8), Zn(9), Cd(10), and Hg(11)}. Infrared, 1H, 13C Nuclear Magnetic Resonance molar conductivity, and elemental analysis were used to characterize the synthesized complexes. The results suggest that HPMCT is bonded as monodentate via an S atom in Complexes (1–4), whereas linkage as a bidentate chelating ligand via S and N atoms gives two chelate rings. Moreover, the synthesized ligand and the complexes were screened for antibacterial activity, which displayed that the very best antibacterial activities for Complexes (1), (6), and (3). In addition, the cytotoxic activity of the HPMCT ligand, [PdCl2(HPMCT)2] (2), and [PtCl2(HPMCT)2] (3) were screened on breast cancer cell lines (MCF-7), and Complex (3) reveals the most promising activity with an IC50 value 12.72 ± 0.4 μM. Using the B3LYP method and 6-311++G(d,p) basis sets for the ligand and the SDD basis set for the central metal, the synthesized complexes utilizing the prepared ligand were optimized. Various quantum parameters such as hardness, electron affinity, dipole moment, vibrational frequencies, and ionization energy for the ligand and its complexes have been calculated. In general, a favorable agreement was found between the experimental results and the obtained theoretical results.
- Published
- 2023
- Full Text
- View/download PDF
17. A quantitative and qualitative assessment of sugar beet genotype resistance to root-knot nematode, Meloidogyne incognita
- Author
-
Ibrahim M. A. Gohar, Amal Alyamani, Manal E. Shafi, Elshaimaa A. E. Mohamed, Rehab Y. Ghareeb, Elsayed M. Desoky, Mohamed E. Hasan, Amera F. Zaitoun, Nader R. Abdelsalam, Khaled A. El-Tarabily, and Ahmed S. M. Elnahal
- Subjects
Beta vulgaris ,Meloidogyne incognita ,modified host-parasite index ,phylogenetic analysis ,quantitative and qualitative schemes ,root-knot nematode ,Plant culture ,SB1-1110 - Abstract
Sugar beet productivity is highly constrained by the root-knot nematode (RKN) Meloidogyne incognita. Eight sugar beet genotypes were screened under greenhouse conditions for their susceptibility to M. incognita according to an adapted quantitative scheme for assignment Canto-Saenz’s host suitability (resistance) designations (AQSCS). Besides, the degree of susceptibility or tolerance of the examined genotypes was recorded by the modified host-parasite index (MHPI) scale based on yield performance. In addition, single nucleotide polymorphism (SNP) was also determined. Sugar beet genotypes have been classified into four categories for their susceptibility or tolerance according to the AQSCS scale. The first category, the moderately resistant (MR) group implies only one variety named SVH 2015, which did not support nematode reproduction (RF≤1), and had less root damage (GI≈2). Second, the tolerant group (T) involving Lilly and Halawa KWS supported fairly high nematode reproduction (RF>1) with relatively plant damage (GI≤2). Whereas the susceptible (S) category involved four varieties, FARIDA, Lammia KWS, Polat, and Capella, which supported nematode reproduction factor (RF>1) with high plant damage (GI>2). The fourth category refers to the highly susceptible (HYS) varieties such as Natura KWS that showed (RF≤1) and very high plant damage (GI>2). However, the MHPI scale showed that Lammia KWS variety was shifted from the (S) category to the (T) category. Results revealed significant differences among genotypes regarding disease severity, yield production, and quality traits. The SVH 2015 variety exhibited the lowest disease index values concerning population density with 800/250 cm3 soils, RF=2, root damage/gall index (GI=1.8), gall size (GS=2.3), gall area (GA=3.7), damage index (DI=3.4), susceptibility rate (SR=2.4), and MHP index (MHPI=2.5). However, Lammia KWS showed the highest disease index values regarding population density with 8890/250 cm3 soils, RF= 22.2, GI= 4.8, and SR= 14.1. Meanwhile, Natura KWS the highest GS, GA and MHPI with 7.1, 8 and 20.9, respectively. The lowest DI was achieved by Capella (DI= 6) followed by Lammia KWS (DI= 5.9). For yield production, and quality traits, SVH 2015 exhibited the lowest reductions of sugar yields/beet's root with 11.1%. While Natura KWS had the highest reduction with 79.3%, as well as it showed the highest reduction in quality traits; including sucrose, T.S.S, and purity with 65, 27.3, and 51.9%, respectively. The amino acid alignment and prediction of the DNA sequences revealed the presence of five SNPs among all sugar beet verities.
- Published
- 2023
- Full Text
- View/download PDF
18. Spontaneous Formation of 3D Breast Cancer Tissues on Electrospun Chitosan/Poly(ethylene oxide) Nanofibrous Scaffolds
- Author
-
Amna M. I. Rabie, Ahmed S. M. Ali, Munir A. Al-Zeer, Ahmed Barhoum, Salwa EL-Hallouty, Wafaa G. Shousha, Johanna Berg, Jens Kurreck, and Ahmed S. G. Khalil
- Subjects
Chemistry ,QD1-999 - Published
- 2022
- Full Text
- View/download PDF
19. An efficient computational scheme for solving coupled time-fractional Schrödinger equation via cubic B-spline functions.
- Author
-
Mubashir Hayat, Afzaal, Abbas, Muhammad, Emadifar, Homan, Alzaidi, Ahmed S. M., Nazir, Tahir, and Aini Abdullah, Farah
- Subjects
CUBIC equations ,FINITE difference method ,FRACTIONAL calculus ,NUMERICAL analysis ,SCHRODINGER equation ,COMPUTER graphics ,QUANTUM Hall effect - Abstract
The time fractional Schrödinger equation contributes to our understanding of complex quantum systems, anomalous diffusion processes, and the application of fractional calculus in physics and cubic B-spline is a versatile tool in numerical analysis and computer graphics. This paper introduces a numerical method for solving the time fractional Schrödinger equation using B-spline functions and the Atangana-Baleanu fractional derivative. The proposed method employs a finite difference scheme to discretize the fractional derivative in time, while a θ-weighted scheme is used to discretize the space directions. The efficiency of the method is demonstrated through numerical results, and error norms are examined at various values of the non-integer parameter, temporal directions, and spatial directions. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
20. Effect of Biosynthesized Nanoselenium on Controlling Tomato Root-Knot Nematode Meloidogyne incognita
- Author
-
Asmaa Sh. M. Daoush, Mohamed H. Hendawey, Rabaa Yaseen, Ahmed S. M. El-Nuby, Tarek M. Bedair, Khairiah Mubarak Alwutayd, Nawal Al-Hoshani, Ahmed Shaaban, Anum Bashir, and Lin Li
- Subjects
selenium nanoparticles ,Pseudomonas stutzeri ,Meloidogyne incognita ,tomato plants ,biocontrol agent ,Agriculture - Abstract
Tomato is a globally important fruit crop, which is easily susceptible to infection by plant-parasitic nematodes during growth. In this study, selenium nanoparticles were biosynthesized through the selenite reduction pathway in a wild-type Pseudomonas stutzeri BB19 and were characterized by uniform nanostructured needle-like forms with an average size of 95.2 nm. The nematicidal effect of biosynthesized selenium nanoparticles (BioSeNPs) at different concentrations (2, 6, and 10 ppm) during the pre- or post-infection of tomato root-knot nematode (RKN), Meloidogyne incognita, was assessed under greenhouse conditions. The BioSeNPs were applied as a foliar spray or a soil drench, compared to ethoprophos nematicide (100 mL/pot). The results showed that the ethoprophos nematicide significantly reduced the number of galls, egg mass, and eggs/egg mass of M. incognita by 94.2, 92.8, and 49.8%, respectively. BioSeNPs, as foliar sprays, significantly reduced the number of galls in post-treated infected tomato plants at 10 ppm and in pre-treated infected tomato plants at 2 ppm by 91.9 and 91.4%, respectively. Concerning the egg mass, BioSeNPs significantly reduced it in pre-treated infected tomato plants at 2 ppm as a foliar spray by 90.9%. Moreover, BioSeNPs significantly reduced the eggs/egg mass in pre-treated infected tomato plants at 2 ppm as a soil drench by 43.3%. On the other hand, the BioSeNPs considerably improved tomato growth, chlorophyll a and b, carotenoid content, and enzymes (i.e., catalase and peroxidase) activity compared to untreated infected tomato plants (negative control). Hence, the BioSeNPs show a significant application potential as a cost-effective and environmentally friendly biocontrol agent for RKN management in tomato plants.
- Published
- 2023
- Full Text
- View/download PDF
21. Steam Boilers in Ready-Made Garments Industry in Bangladesh: Existing Scenario and Scope for Development
- Author
-
Siraj, Md Tanvir, primary, Hasan, Md Mehedi, additional, Ahmed, A N Faisal, additional, Faruk, Faisal Bin, additional, Ahmed, Md Foysal, additional, Chowdhury, Md Kamrul Hasan, additional, Ahmed, S M Faysal, additional, Islam, Md Sohidul, additional, Sefat E Nur, Kazi, additional, and Saeed, Syed Salman, additional
- Published
- 2024
- Full Text
- View/download PDF
22. Cd(II) and Pd(II) Mixed Ligand Complexes of Dithiocarbamate and Tertiary Phosphine Ligands—Spectroscopic, Anti-Microbial, and Computational Studies
- Author
-
Tohama B. Abdullah, Reza Behjatmanesh-Ardakani, Ahmed S. Faihan, Hayfa M. Jirjes, Mortaga M. Abou-Krisha, Tarek A. Yousef, Sayed H. Kenawy, and Ahmed S. M. Al-Janabi
- Subjects
picolylamine ,dithiocarbamate ,single-pot reaction ,DFT ,complexes ,Organic chemistry ,QD241-441 - Abstract
Mixed ligand complexes of Pd(II) and Cd(II) with N-picolyl-amine dithiocarbamate (PAC-dtc) as primary ligand and tertiary phosphine ligand as secondary ligands have been synthesized and characterized via elemental analysis, molar conductance, NMR (1H and 31P), and IR techniques. The PAC-dtc ligand displayed in a monodentate fashion via sulfur atom whereas diphosphine ligands coordinated as a bidentate mode to afford a square planner around the Pd(II) ion or tetrahedral around the Cd(II) ion. Except for complexes [Cd(PAC-dtc)2(dppe)] and [Cd(PAC-dtc)2(PPh3)2], the prepared complexes showed significant antimicrobial activity when evaluated against Staphylococcus aureus, Pseudomonas aeruginosa, Candida albicans and Aspergillus niger. Moreover, DFT calculations were performed to investigate three complexes {[Pd(PAC-dtc)2(dppe)](1), [Cd(PAC-dtc)2(dppe)](2), [Cd(PAC-dtc)2(PPh3)2](7)}, and their quantum parameters were evaluated using the Gaussian 09 program at the B3LYP/Lanl2dz theoretical level. The optimized structures of the three complexes were square planar and tetrahedral geometry. The calculated bond lengths and bond angles showed a slightly distorted tetrahedral geometry for [Cd(PAC-dtc)2(dppe)](2) compared to [Cd(PAC-dtc)2(PPh3)2](7) due to the ring constrain in the dppe ligand. Moreover, the [Pd(PAC-dtc)2(dppe)](1) complex showed higher stability compared to Cd(2) and Cd(7) complexes which can be attributed to the higher back-donation of Pd(1) complex.
- Published
- 2023
- Full Text
- View/download PDF
23. Spectroscopic, Anti-Cancer Activity, and DFT Computational Studies of Pt(II) Complexes with 1-Benzyl-3-phenylthiourea and Phosphine/Diamine Ligands
- Author
-
Dina Saadi Mohamed, Subhi A. Al-Jibori, Reza Behjatmanesh-Ardakani, Ahmed S. Faihan, Tarek A. Yousef, Abdulrahman G. Alhamzani, Mortaga M. Abou-Krisha, Ahmed S. M. Al-Janabi, and Benjamin S. Hsiao
- Subjects
thiourea ,phosphine ,computational ,DFT ,platinum ,Inorganic chemistry ,QD146-197 - Abstract
The reaction between [PtCl2(L-L)] (L-L = dppe, dppp, dppb, dppf, Phen and Bipy) or [PtCl2(PPh3)2] with 1-benzyl-3-phenylthiourea (H2BPT) in a basic medium (CHCl3/EtOH) created new coordinated square planner Pt(II) complexes with [Pt(BPT)(L-L)] (1–4,6,7) and [Pt(BPT)(PPh3)2] (5) types. These complexes were fully characterized by analytical and spectroscopic techniques (i.e., IR, UV. Vis., 1H, and 31P NMR). The results indicated that the thiourea derivative ligand act as a dianion ligand bonded through both S and N atoms in a chelating mode or as a mono-anion ligand coordinated through a sulfur atom with Pt(II) ion. Cytotoxicity activity was performed by the MTT assay to determine anti-cancer activities against MCF-7 breast cancer cells. The study indicated that IC50 values for MCF-7 cells were 10.96–78.90 µM. Additionally, the complexes [Pt(BPT)(dppe)] (1), [Pt(BPT)(PPh3)2] (5), and [Pt(BPT)2(Bipy)] (7) were investigated theoretically, where their quantum parameters were evaluated using the Gaussian 09 program using the theory of B3LYP/Def2TZVP//B3LYP/Lanl2dz. The calculation results confirmed the optimized structures of the complexes square planar geometry. However, the calculated bond lengths and angles showed a slightly distorted square planar geometry due to the trans influence of the sulfur atom. Additionally, complexes of [Pt(BPT)(dppe)] (1) and [Pt(BPT)(PPh3)2] (5) showed higher stability compared to [Pt(BPT)2(Bipy)] (7), which can be attributed to the higher back-donation of (1) and (5) complexes. Furthermore, among the three complexes, the [Pt(BPT)2(Bipy)] (7) complex possessed the lowest HOMO–LUMO gap, which may be a good candidate as the photo-catalyst material.
- Published
- 2023
- Full Text
- View/download PDF
24. Physiological, Biochemical, Anatomical, and Agronomic Responses of Sesame to Exogenously Applied Polyamines under Different Irrigation Regimes
- Author
-
El Sayed M. Desoky, Khadiga Alharbi, Mostafa M. Rady, Ahmed S. M. Elnahal, Eman Selem, Safaa M. A. I. Arnaout, and Elsayed Mansour
- Subjects
Mediterranean region ,drought ,physio-biochemical parameters ,crop water productivity ,principal components analysis ,heatmap and hierarchical clustering ,Agriculture - Abstract
Polyamines (PAs) are plant growth regulators that attenuate the destructive impacts of water deficit on sesame plants, particularly in arid regions under abrupt climate change. Limited information is available on the physiological, biochemical, anatomical, and agronomic responses of sesame to exogenous application of PAs under water deficit under field conditions. Thus, a two-season field trial was carried out to assess the impact of exogenously sprayed spermine (Spm), spermidine (Spd), and putrescine (Put) on physio-biochemical and anatomical parameters and their influences on agronomic performance and crop water productivity of sesame plants. The sesame plants were assessed under three irrigation regimes; full irrigation (100% ETc), mild drought (75% ETc), and severe drought (50% ETc) conditions. Drought stress displayed negative impacts on all evaluated parameters. However, exogenously applied Pas, especially Put, restricted the destructive effects of water deficit. The application of PAs exhibited highly significant enhancement in photosynthetic pigments (chlorophyll a, b, and carotenoids), gas exchange (net photosynthetic rate, stomatal conductance, and rate of transpiration), water relations (relative water content, membrane stability index, excised leaf water retention), and plant nutrient content (N, P, and K) compared to untreated plants, particularly under severe drought stress. Moreover, PA application displayed highly significant amelioration in osmoprotectants (free proline, soluble sugars, α-Tocopherol, ascorbate, and glutathione), and antioxidant enzyme activities (catalase, peroxidase, superoxide dismutase, ascorbate peroxidase, and glutathione reductase). In addition, foliar nourishing with PAs exhibited a highly significant reduction in oxidative stress markers (malondialdehyde, electrolyte leakage, superoxide, and hydrogen peroxide). These positive impacts of PA application under drought stress were reflected in highly significant improvement in anatomical characteristics (midrib length and width, vascular bundle length and width, thickness of phloem, xylem and collenchyma, vessel diameter, and number of xylem rows in midvein bundle), and yield-related traits (plant height, leaf area, number of capsules per plant, 1000-seed weight, seed yield, and oil content). Consequently, exogenous application of PAs (in particular, Put) could be exploited to enhance the crop water productivity and yield traits of sesame plants under low water availability in arid regions.
- Published
- 2023
- Full Text
- View/download PDF
25. New Dual Inhibitors of SARS-CoV-2 Based on Metal Complexes with Schiff-Base 4-Chloro-3-Methyl Phenyl Hydrazine: Synthesis, DFT, Antibacterial Properties and Molecular Docking Studies
- Author
-
Ahmed S. M. Al-Janabi, Amin O. Elzupir, Mortaga M. Abou-Krisha, and Tarek A. Yousef
- Subjects
Schiff base ,hydrazine ,complexes ,antibacterial ,SARS-CoV-2 ,DFT ,Inorganic chemistry ,QD146-197 - Abstract
This paper explores a dual inhibition of main protease (Mpro) and nonstructural protein 10/nonstructural protein 16 (NSP16) methyltransferase complex as the key targets for COVID-19 therapy. These are based on the new Schiff-base ligand that was obtained from the condensation of (4-chloro-3-methyl phenyl) hydrazine with 2-pyridine-carboxaldehyde and its novel Schiff-base metal complexes. These include Ni(II), Pd(II), Pt(II), Zn(II), and Hg(II). The newly synthesized compounds have been characterized using FT-IR, 1H NMR, 13C NMR, and elemental analysis. The results suggested that the Schiff-base ligand is coordinated as a bidentate ligand through the nitrogen atoms of the azomethine group and pyridyl ring. In addition, the biological activity of the prepared complexes was examined against Pseudomonas aeruginosa and Staphylococcus aureus, and the results showed that the Zn(II) complex has the highest activity compared with other compounds. The active sites were found by looking at the molecular electrostatic potential (MEP) maps of the above ligands and complexes. The activity of the compound and its Ni(II) and Zn(II) complexes against Mpro and NSP10/ NSP16 was investigated using a molecular docking approach. They showed excellent binding energies ranging from −5.9 to −7.2 kcal/mol and −5.8 to −7.2 for Mpro and NSP16, respectively. All conformers of the metal complexes were docked with the active site of the NSP16 receptor, showing a binding affinity of 100%. According to our knowledge, this was the first report of these metal complexes as dual inhibitors for Mpro and NSP16 of SARS-CoV-2.
- Published
- 2023
- Full Text
- View/download PDF
26. EFFICACY OF LOOP MEDIATED ISOTHERMAL AMPLIFICATION (LAMP) ASSAY IN DETECTING MYCOBACTERIUM TUBERCULOSIS IN EXTRAPULMONARY SAMPLES.
- Author
-
Pujitha, Thota, Charan, A. Ravi, Chakravarthy, V. Sailendra, and Ahmed, S. M.
- Subjects
EXTRAPULMONARY tuberculosis ,MYCOBACTERIUM tuberculosis ,MEDICAL technology ,TUBERCULOSIS ,TUBERCULOSIS patients - Abstract
Introduction: Despite the availability of highly efficacious treatments for decades, tuberculosis remains a major public health issue worldwide. In 2017, WHO reported that 10.0 million people developed TB, mainly in developing countries, and that approximately 3.6 million (36%) were not diagnosed or notified to the national authorities. The most widely used method for TB diagnosis is sputum smear microscopy. This test is simple, rapid, and inexpensive but has a relatively low sensitivity, particularly in patients with extrapulmonary TB, children, and in people with HIV. Hence, the development of new diagnostic tools suitable for use in low- and middle-income countries is one of the top priorities for TB control. Materials and Methods: A Prospective study conducted from January 2023- December 2023 (12 months) in the Department of Respiratory Medicine, Gayatri Vidya Parishad Institute of Health Care and Medical Technology, Visakhapatnam). Sputum samples collected from all patients suspected to have pulmonary tuberculosis due to Mycobacterium tuberculosis complex. Samples were collected from those patients who fulfilled the following clinical criteria. Data were analysed using SPSS to determine specificity and sensitivity of LAMP in comparison to culture for detection of Mycobacterium Tuberculosis. The sputum specimens that full filled the criteria were included in this study. Around 50 sputum samples were collected and processed. Results: Hundred sputum samples which were fitted into the criteria were processed. 50 sputum samples male patients 65%, and the remaining 35% were obtained from female patient. It shows majority of presumptive pulmonary tuberculosis patients were males. Among the 50 sputum samples that were received in the laboratory, maximum number of 15 patients fall under the age group 51-60 years, followed by 13 patients in 61-70 years and 9 patients between 41-50 years. Least incidence was seen under the extreme age groups less than 10 years, and greater than 81 years. Conclusion: The sensitivity and specificity of LAMP and Gene Xpert MTB/RIF were almost equal in our study. In comparison to LAMP, Gene Xpert MTB/RIF machine and its consumables (cartridge) are very expensive. Moreover Gene Xpert MTB/RIF requires air conditioning; fluctuation in temperature adversely affects its performance, so it is not feasible to implement in peripheral health centres. LAMP is cost effective (50% lesser cost than Xpert), less time consuming (1.5 hour, faster than Xpert), requires minimal amount of sputum and is not adversely affected by temperature fluctuation, making it ideal for use in peripheral poor resource health centres. [ABSTRACT FROM AUTHOR]
- Published
- 2024
27. A PROSPECTIVE OBSERVATIONAL STUDY OF PREVALENCE AND EFFECT OF ANEMIA IN COPD PATIENTS IN A TERTIARY CARE HOSPITAL.
- Author
-
Pujitha, Thota, Chittapuli, B. V. Srilakshmi, Ahmed, S. M., Ramana Lakshmi, K. Hema Sai, and Charan, A. Ravi
- Subjects
CHRONIC obstructive pulmonary disease ,HOSPITAL care ,TERTIARY care ,ANEMIA ,PATIENT care - Abstract
Introduction: The global strategy for the diagnosis, management, and prevention of chronic obstructive pulmonary disease (COPD) defines COPD as a typical preventable and treatable disease. Described by a diligent wind current limit is typically progressive and associated with an improved chronic provocative reaction, in the airways and the lung, to harmful particles or gases. Materials and Methods: It was a prospective observational study carried out at a tertiary care centre to evaluate the prevalence of anemia in patients with COPD and its impact on quality of life. The duration of study was one year. Anemia was defined according to WHO criteria, hemoglobin level <13g/dl in men and <12g/dl in women. 114 patients of COPD (confirmed on spirometry as per the GOLD 2017 guidelines) were enrolled after an explicit, written consent. Patient's detailed history was taken, including smoking status, pack year and biomass fuel exposure. Physical examination was conducted to include anthropometric details, routine blood investigations, chest radiograph (postero-anterior view) and a 6 minute walk test. Results: Out of 114 patients enrolled in the study, 30 (26.32%) were found to be anemic and were classified as group I while rest 84(73.68%) were non - anemic and were classified as group II. The mean hemoglobin levels in group I (anemic group) was 11.42 g/dl whereas the mean hemoglobin level in group II was 14.54 g/dl. However there was no significant difference between those with and without anemia in their average age, gender distribution, dietary habits and pack years smoked. Conclusion: The various factors significantly associated with anemia in our study were number of exacerbations of COPD leading to hospitalization, mMRC grade and quality of life. In conclusion, anemia occurs frequently in patients of COPD and is associated with poor quality of life and increased morbidity in the form of number of exacerbations and hospital admissions. Correcting anemia in these patients may improve their clinical outcome. [ABSTRACT FROM AUTHOR]
- Published
- 2024
28. Inverse Exponentiated Lomax Power Series Distribution: Model, Estimation, and Application
- Author
-
Amal S. Hassan, Ehab M. Almetwally, Samia C. Gamoura, and Ahmed S. M. Metwally
- Subjects
Mathematics ,QA1-939 - Abstract
In this paper, we introduce the inverse exponentiated Lomax power series (IELoPS) class of distributions, obtained by compounding the inverse exponentiated Lomax and power series distributions. The IELoPS class contains some significant new flexible lifetime distributions that possess powerful physical explications applied in areas like industrial and biological studies. The IELoPS class comprises the inverse Lomax power series as a new subclass as well as several new flexible compounded lifetime distributions. For the proposed class, some characteristics and properties are derived such as hazard rate function, limiting behavior, quantile function, Lorenz and Bonferroni curves, mean residual life, mean inactivity time, and some measures of information. The methods of maximum likelihood and Bayesian estimations are used to estimate the model parameters of one optional model. The Bayesian estimators of parameters are discussed under squared error and linear exponential loss functions. The asymptotic confidence intervals, as well as Bayesian credible intervals, of parameters, are constructed. Simulations for a one-selective model, say inverse exponentiated Lomax Poisson (IELoP) distribution, are designed to assess and compare different estimates. Results of the study emphasized the merit of produced estimates. In addition, they appeared the superiority of Bayesian estimate under regarded priors compared to the corresponding maximum likelihood estimate. Finally, we examine medical and reliability data to demonstrate the applicability, flexibility, and usefulness of IELoP distribution. For the suggested two real data sets, the IELoP distribution fits better than Kumaraswamy–Weibull, Poisson–Lomax, Poisson inverse Lomax, Weibull–Lomax, Gumbel–Lomax, odd Burr–Weibull–Poisson, and power Lomax–Poisson distributions.
- Published
- 2022
- Full Text
- View/download PDF
29. Thiourea Derivative Metal Complexes: Spectroscopic, Anti-Microbial Evaluation, ADMET, Toxicity, and Molecular Docking Studies
- Author
-
Al-Halbosy, Ahmed T. F., primary, Hamada, Adnan A., additional, Faihan, Ahmed S., additional, Saleh, Abdulrahman M., additional, Yousef, Tarek A., additional, Abou-Krisha, Mortaga M., additional, Alhalafi, Mona H., additional, and Al-Janabi, Ahmed S. M., additional
- Published
- 2023
- Full Text
- View/download PDF
30. Exploring Phosphorus Fraction Dynamics in Loess Soils: Impact of Long-Term Nitrogen and Phosphorus Fertilization on Cropland and Fallow Land
- Author
-
Mahmood, Mohsin, primary, Mehmood, Sajid, additional, Ahmed, Waqas, additional, Salah Elrys, Ahmed, additional, Tian, Yi, additional, Hui, Xiaoli, additional, Ayyoub, Anam, additional, Elnahal, Ahmed S. M., additional, Li, Weidong, additional, Wang, Zhaohui, additional, and Liu, Jinshan, additional
- Published
- 2023
- Full Text
- View/download PDF
31. Exploring biochar and fishpond sediments potential to change soil phosphorus fractions and availability
- Author
-
Mahmood, Mohsin, primary, Wang, Yunting, additional, Ahmed, Waqas, additional, Mehmood, Sajid, additional, Ayyoub, Anam, additional, Elnahal, Ahmed S. M., additional, Li, Weidong, additional, and Zhan, Xin, additional
- Published
- 2023
- Full Text
- View/download PDF
32. Community microgrid: an approach towards positive energy community in an urban area of Dhaka, Bangladesh
- Author
-
Zeyad, Mohammad, primary, Ahmed, S M Masum, additional, Hasan, Sayeed, additional, and Mahmud, Dewan Mahnaaz, additional
- Published
- 2023
- Full Text
- View/download PDF
33. Bioactive fluorenes. Part III: 2,7-dichloro-9H-fluorene-based thiazolidinone and azetidinone analogues as anticancer and antimicrobial against multidrug resistant strains agents
- Author
-
Essam M. Hussein, Reem I. Alsantali, Moataz Morad, Rami J. Obaid, Hatem M. Altass, Ali Sayqal, Mohamed A. S. Abourehab, Amal A. Elkhawaga, Ahmed S. M. Aboraia, and Saleh A. Ahmed
- Subjects
Fluorene ,Thiazolidinones ,Azetidinones ,Pharmacophores ,Antimicrobial ,Anti-cancer ,Chemistry ,QD1-999 - Abstract
Abstract Background Thiazoles, thiazolidinones and azetidinones are highly ranked amongst natural and synthetic heterocyclic derivatives due to their great pharmaceutical potential. Results New thiazolidinone and azetidinone class of bioactive agents based on 4-(2,7-dichloro-9H-fluoren-4-yl)thiazole moiety have been successfully synthesized. 4-(2,7-dichloro-9H-fluoren-4-yl)thiazol-2-amine was synthesized and allowed to react with various aryl/heteroaryl aldehydes to afford the corresponding Schiff base intermediates. The target thiazolidinone and azetidinone analogues have derived from Schiff bases by their reactions with thioglycolic acid and chloroacetyl chloride, respectively. The newly synthesized compounds were then evaluated for their antimicrobial activity against some multidrug resistant strains and examined for cytotoxic activity against normal lung fibroblast (WI-38), human lung carcinoma (A549), and human breast carcinoma (MDA-MB-231) cell lines to develop a novel class of fluorene-based bioactive agents. The mode of action and the binding interaction of the synthesized compound with the active sites of dihydrofolate reductase enzyme were well identified by fluorescence-activated cell sorting (FACS) analysis and molecular docking study. Conclusion Some of the synthesized compounds showed remarkable activity against A-549 and MDA-MB-231 when compared to Taxol, which was used as a reference drug. 2,7-dichloro-9H-fluorene-based azetidinones are more efficient as antimicrobial and anticancer agents compared to dichloro-9H-fluorene-based thiazolidinones derivatives.
- Published
- 2020
- Full Text
- View/download PDF
34. Numerical Solutions of Third-Order Time-Fractional Differential Equations Using Cubic B-Spline Functions
- Author
-
Muhammad Abbas, Afreen Bibi, Ahmed S. M. Alzaidi, Tahir Nazir, Abdul Majeed, and Ghazala Akram
- Subjects
cubic B-spline functions ,third-order time-fractional partial differential equation ,Caputo’s time fractional derivative ,stability ,convergence ,Crank–Nicholson finite difference scheme ,Thermodynamics ,QC310.15-319 ,Mathematics ,QA1-939 ,Analysis ,QA299.6-433 - Abstract
Numerous fields, including the physical sciences, social sciences, and earth sciences, benefit greatly from the application of fractional calculus (FC). The fractional-order derivative is developed from the integer-order derivative, and in recent years, real-world modeling has performed better using the fractional-order derivative. Due to the flexibility of B-spline functions and their capability for very accurate estimation of fractional equations, they have been employed as a solution interpolating polynomials for the solution of fractional partial differential equations (FPDEs). In this study, cubic B-spline (CBS) basis functions with new approximations are utilized for numerical solution of third-order fractional differential equation. Initially, the CBS functions and finite difference scheme are applied to discretize the spatial and Caputo time fractional derivatives, respectively. The scheme is convergent numerically and theoretically as well as being unconditionally stable. On a variety of problems, the validity of the proposed technique is assessed, and the numerical results are contrasted with those reported in the literature.
- Published
- 2022
- Full Text
- View/download PDF
35. Spatial heterogeneity in the radiogenic activity of the lunar interior: Inferences from CHACE and LLRI on Chandrayaan-1
- Author
-
Sridharan, R., Das, Tirtha Pratim, Ahmed, S. M., Supriya, Gogulapati, Bhardwaj, Anil, and Kamalakar, J. A.
- Subjects
Physics - Space Physics ,Astrophysics - Earth and Planetary Astrophysics ,Physics - Atomic Physics ,Physics - Geophysics - Abstract
In the past, clues on the potential radiogenic activity of the lunar interior have been obtained from the isotopic composition of noble gases like Argon. Excess Argon (40) relative to Argon (36), as compared to the solar wind composition, is generally ascribed to the radiogenic activity of the lunar interior. Almost all the previous estimates were based on, 'on-the-spot' measurements from the landing sites. Relative concentration of the isotopes of 40Ar and 36Ar along a meridian by the Chandra's Altitudinal Composition Explorer (CHACE) experiment, on the Moon Impact Probe (MIP) of India's first mission to Moon, has independently yielded clues on the possible spatial heterogeneity in the radiogenic activity of the lunar interior in addition to providing indicative 'antiquity' of the lunar surface along the ground track over the near side of the moon. These results are shown to broadly corroborate the independent topography measurements by the Lunar Laser Ranging Instrument (LLRI) in the main orbiter Chandrayaan-1. The unique combination of these experiments provided high spatial resolution data while indicating the possible close linkages between the lunar interior and the lunar ambience.
- Published
- 2013
- Full Text
- View/download PDF
36. Effect of protein aggregates on properties and structure of rice bran protein-based film at different pH
- Author
-
Wang, Na, Saleh, Ahmed S. M., Gao, Yuzhe, Wang, Peng, Duan, Yumin, and Xiao, Zhigang
- Published
- 2019
- Full Text
- View/download PDF
37. Synthesis, characterization and study of mercury(II) complexes with phosphine and heterocyclic thiones
- Author
-
null Ahmed S. M. Al-Janabi
- Subjects
General Medicine - Abstract
Many new mixed ligand complexes of mercury(II) have been synthesized with LH = 4,5-(diphenyl)-1,2,4-triazole-3-thione (diptSH) and tertiary phosphines as co-ligands. The compounds have been characterized by elemental analyses, IR, UV–Vis, molar conductivity, and NMR spectroscopy. In the binuclear complexes (2-5), both Hg atoms have tetrahedral geometry, the Hg atom bonded to three halide ions and one thione ligand (LH) through the sulfur atom. The complex (6) show that thiolate ligand(diptS-) is coordinated as monodentate through the sulfur atom. The dppm behave as bidentate bridging ligand to bonded two Hg(II) ions in the complex (7), Whereas in the complexes (7-10), the thionlate ligand bonded as a monodentate fashion via the sulfur atom, while the diphosphines ligands coordinated as bidentate chelating ligands, and the geometry around the Hg center ion is tetrahedral. And in the complexes (11 and 12), the phosphine bonded as monodentate ligand, and the thionlate bonded via the sulfur atom as monodentate to give tetrahedral complexes
- Published
- 2023
38. Synthesis and characterization of Pd(II) and Pt(II) complexes containing mixed ligands of thione and diamine
- Author
-
null Ahmed S. M. Al-Janabi
- Subjects
General Medicine - Abstract
New Pd(II) and Pt(II) complexes of the type [M(bzoS)2(diamine)] {where M = Pd(II) or Pt(II) } from the treatment of one mole of the diamine ligands {diamine = , phenanthroline (Phen), bipyridine (Bipy), ethylene diamine (en), or N,N′-dimethyl ethylene diamine (dmen)} with one mole of [M(bzoS)2] complexes. The prepared complexes were characterization by elemental analysis (CHN), molar conductivity, infrared spectroscopy, and nuclear magnetic resonance of proton (1H NMR). The bzoS- ligand was bonded as monodentate through the sulfur atom whereas the diamine ligands were bonded as bidentate fashion via the nitrogen atoms to give a square planner arrangement a round to the Pd and Pt ions.
- Published
- 2023
39. Synthesis and Characterization of Mixed Ligands Cadmium (II) Complexes with N-Hydroxymethylsaccharinate and diphosphines
- Author
-
null Ahmed S. M. Al-Janabi, null Ahmed A. Irzoqi, and null Shihab A. O. Ahmed
- Subjects
General Medicine - Abstract
Reaction of cadimium(II) chloride CdCl2.6H2O with two equivalents of N-hydroxymethylsaccharin (Sac-CH2OH) (1) in the presence of NEt3 afforded the presumably tetrahedral complex [Cd(K2-Sac-CH2O)2] (2). The Sac-CH2O- ligand behaves as a bidentate chelate. Reaction of (2) with one equivalent of the bidentate ligands (dipos); Ph2P(CH2)nPPh2, (n = 1 dppm; 2 dppe; 3 dppp; 4 dppb), Ph2P(S)(CH2)P(S)Ph2 (dppmS2) afforded tetrahedral complexes of the type [Cd(K1-Sac-CH2O)2(diphos)] (3-7). The reaction with two equivalents of the monodentate ligands (phos); Ph3P or Ph3PS gave [Cd(K1-Sac-CH2O)2(phos)2] (8,9). The N-hydroxymethylsaccharinate anion acts as a monodentate ligand to the cadmium center through the hydroxymethyl oxygen atom. The complexes were characterized by physico-chemical and spectroscopic methods.
- Published
- 2023
40. Synthesis and characterization of new metal complexes of thione and phosphines Ligands
- Author
-
null Ahmed S. M. Al-Janabi, null Hayfa Muhammed Jerjes, and null Mohammed H. Salah
- Subjects
General Medicine - Abstract
The complexes containing mixed of ligands [5-(3-chlorophenyl) -1,3,4-oxadiazole-2-thione(CPoxSH)] and diphosphines Ph2P(CH2)nPPh2 (diphos)(n=1-4), are prepared by the reaction of [Hg(CPoxS)2] or [M(H2O)2(CPoxS)2] (M = Co, Ni ) with one mole proportion of the diphosphine Ph2P(CH2)nPPh2 gave tetrahedral complexes of the type [Hg(CPoxS)2(diphos)]. While gave an octahedral complexes with cobalt(II) and nickel(II) ions of the type [M(H2O)(CPoxS)2(diphos)] when (M = Co and Ni ) receptivity. The prepared complexes were characterized by molar conductivity, elemental analysis, IR, 1H, 13C-{1H} and 31P-{1H} n.m.r.
- Published
- 2023
41. Development and Optimization of Ciprofloxacin HCl-Loaded Chitosan Nanoparticles Using Box–Behnken Experimental Design
- Author
-
Noha M. Soliman, Faiyaz Shakeel, Nazrul Haq, Fars K. Alanazi, Sultan Alshehri, Mohsen Bayomi, Ahmed S. M. Alenazi, and Ibrahim A. Alsarra
- Subjects
ciprofloxacin HCl ,Box–Behnken design ,chitosan nanoparticles ,desirability function ,response surface methodology ,antibacterial effects ,Organic chemistry ,QD241-441 - Abstract
Various chitosan (CS)-based nanoparticles (CS-NPs) of ciprofloxacin hydrochloride (CHCl) have been investigated for therapeutic delivery and to enhance antimicrobial efficacy. However, the Box–Behnken design (BBD)-supported statistical optimization of NPs of CHCl has not been performed in the literature. As a result, the goal of this study was to look into the key interactions and quadratic impacts of formulation variables on the performance of CHCl-CS-NPs in a systematic way. To optimize CHCl-loaded CS-NPs generated by the ionic gelation process, the response surface methodology (RSM) was used. The BBD was used with three factors on three levels and three replicas at the central point. Tripolyphosphate, CS concentrations, and ultrasonication energy were chosen as independent variables after preliminary screening. Particle size (PS), polydispersity index (PDI), zeta potential (ZP), encapsulation efficiency (EE), and in vitro release were the dependent factors (responses). Prepared NPs were found in the PS range of 198–304 nm with a ZP of 27–42 mV. EE and drug release were in the range of 23–45% and 36–61%, respectively. All of the responses were optimized at the same time using a desirability function based on Design Expert® modeling and a desirability factor of 95%. The minimum inhibitory concentration (MIC) of the improved formula against two bacterial strains, Pseudomonas aeruginosa and Staphylococcus aureus, was determined. The MIC of the optimized NPs was found to be decreased 4-fold compared with pure CHCl. The predicted and observed values for the optimized formulation were nearly identical. The BBD aided in a better understanding of the intrinsic relationship between formulation variables and responses, as well as the optimization of CHCl-loaded CS-NPs in a time- and labor-efficient manner.
- Published
- 2022
- Full Text
- View/download PDF
42. Evaluation of the Effect of Elite Jojoba Lines on the Chemical Properties of their Seed Oil
- Author
-
Nahla A. Awad, Mohamed Eliraq, Emad H. El-Bassel, Ahmed S. M. Ismail, Yasser S. G. Abd El-Aziz, Mohamed S. Gawish, Reda M. Y. Zewail, Rokayya Sami, Ebtihal Khojah, Uguru Hilary, Maalem H. Al-Moalem, and Khaled Sayed-Ahmed
- Subjects
jojoba oil ,chemical composition ,peroxide value ,iodine number ,fatty acids ,Organic chemistry ,QD241-441 - Abstract
Jojoba oil (JO) extracted from seeds has outstanding properties, including anti-inflammatory, antioxidant, and antibacterial activities, and can be stored forlong periodsof time. The unique properties of jojoba oil depend on its chemical composition; therefore, the effect of the jojoba genotype on the chemical properties and active components of the seed oil was evaluated in this study. Oil samples were collected from 15 elite Egyptian jojoba lines. The chemical composition, such as moisture, crude fiber, crude oil, ash, and crude protein of elite lines’ seeds was determined to investigate the variation among them based on the jojoba genotype. In addition, the iodine value was obtained to measure the degree of jojoba oil unsaturation, whereas the peroxide number was determined as an indicator of the damage level in jojoba oil. Fatty acid composition was studied to compare elite jojoba lines. Fatty acid profiles varied significantly depending on the jojoba genotype. Gadoleic acid exhibited the highest percentage value (67.85–75.50%) in the extracted jojoba oil, followed by erucic acid (12.60–14.81%) and oleic acid (7.86–10.99%). The iodine value, peroxide number, and fatty acid composition of the tested elite jojoba lines were compared withthose reported by the International Jojoba Export Council (IJEC). The results showed that the chemical properties of jojoba oils varied significantly, depending on the jojoba genotype.
- Published
- 2022
- Full Text
- View/download PDF
43. First Report of Asphodelus microcarpus as a New Host of Stunt Nematode, Tylenchorhynchus spp., on the Western Mediterranean Coast of Egypt.
- Author
-
El-Nuby, Ahmed S. M.
- Subjects
PLANT nematodes ,WILD plants ,DESERT plants ,NATIVE plants ,HOST plants ,PLANT collecting - Abstract
Copyright of Egyptian Journal of Agronematology is the property of Egyptian Society for Agronematology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2023
- Full Text
- View/download PDF
44. Supramolecular Structure, Hirshfeld Surface Analysis, Morphological Study and DFT Calculations of the Triphenyltetrazolium Cobalt Thiocyanate Complex.
- Author
-
Ali, Essam A., Bechaieb, Rim, Al-Salahi, Rashad, Al-Janabi, Ahmed S. M., Attwa, Mohamed W., and Mostafa, Gamal A. E.
- Subjects
SURFACE analysis ,CHEMICAL stability ,CRYSTAL structure ,INTERMOLECULAR interactions ,CRYSTAL growth - Abstract
Polymorphism is a prevalent occurrence in pharmaceutical solids and demands thorough investigation during product development. This paper delves into the crystal growth and structure of a newly synthesized polymorph (TPT)
2 [CoII (NCS)4 ], (1), where TPT is triphenyl tetrazolium. The study combines experimental and theoretical approaches to elucidate the 3D framework of the crystal structure, characterized by hydrogen-bonded interactions between (TPT)+ cations and [Co(NCS)4 ]2− anions. Hirshfeld surface analysis, along with associated two-dimensional fingerprints, is employed to comprehensively investigate and quantify intermolecular interactions within the structure. The enrichment ratio is calculated for non-covalent contacts, providing insight into their propensity to influence crystal packing interactions. Void analysis is conducted to predict the mechanical behavior of the compound. Utilizing Bravais-Friedel, Donnay-Harker (BFDH), and growth morphology (GM) techniques, the external morphology of (TPT)2 [CoII (NCS)4 ] is predicted. Experimental observations align well with BFDH predictions, with slight deviations from the GM model. Quantum computational calculations of the synthesized compounds is performed in the ground state using the DFT/UB3LYP level of theory. These calculations assess the molecule's stability and chemical reactivity, including the computation of the HOMO-LUMO energy difference and other chemical descriptors. The study provides a comprehensive exploration of the newly synthesized polymorph, shedding light on its crystal structure, intermolecular interactions, mechanical behavior, and external morphology, supported by both experimental and computational analyses. [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF
45. Impact of Particle Size and Carrier Gas on Pulverized Bituminous Coal Emissions: Experimental and Computational Fluid Dynamics Analysis
- Author
-
Ahmed, S M Faysal, primary and Siraj, Md Tanvir, additional
- Published
- 2023
- Full Text
- View/download PDF
46. Influence of the Suchana intervention on exclusive breastfeeding and stunting among children aged under 6 months in the Sylhet region of Bangladesh
- Author
-
Haque, Md Ahshanul, primary, Zaman Wahid, Barbie, additional, Farzana, Fahmida D., additional, Tanvir Ahmed, S. M., additional, Ali, Mohammad, additional, Naz, Farina, additional, Rahman, Sheikh S., additional, Siddiqua, Towfida J., additional, Faruque, A. S. G., additional, Choudhury, Nuzhat, additional, and Ahmed, Tahmeed, additional
- Published
- 2023
- Full Text
- View/download PDF
47. Aptasensor for Quantifying Pancreatic Polypeptide
- Author
-
Ahmed S. M. Ali, Medhat S. El-Halawany, Sherif Abdelaziz Ibrahim, Olga Plückthun, Ahmed S. G. Khalil, and Günter Mayer
- Subjects
Chemistry ,QD1-999 - Published
- 2019
- Full Text
- View/download PDF
48. Existence Results for Coupled Nonlinear Sequential Fractional Differential Equations with Coupled Riemann–Stieltjes Integro-Multipoint Boundary Conditions
- Author
-
Ymnah Alruwaily, Bashir Ahmad, Sotiris K. Ntouyas, and Ahmed S. M. Alzaidi
- Subjects
sequential fractional differential equations ,Caputo fractional derivative ,Riemann–Stieltjes integro-multipoint boundary conditions ,existence and uniqueness ,fixed point ,Thermodynamics ,QC310.15-319 ,Mathematics ,QA1-939 ,Analysis ,QA299.6-433 - Abstract
This paper is concerned with the existence of solutions for a fully coupled Riemann–Stieltjes, integro-multipoint, boundary value problem of Caputo-type sequential fractional differential equations. The given system is studied with the aid of the Leray–Schauder alternative and contraction mapping principle. A numerical example illustrating the abstract results is also presented.
- Published
- 2022
- Full Text
- View/download PDF
49. Salinity Stress Enhances the Antioxidant Capacity of Bacillus and Planococcus Species Isolated From Saline Lake Environment
- Author
-
Abdelrahim H. A. Hassan, Dalal Hussien M. Alkhalifah, Sulaiman A. Al Yousef, Gerrit T. S. Beemster, Ahmed S. M. Mousa, Wael N. Hozzein, and Hamada AbdElgawad
- Subjects
salinity stress ,Bacillus ,Planococcus ,stress markers ,antioxidants ,Microbiology ,QR1-502 - Abstract
This study aims at exploiting salinity stress as an innovative, simple, and cheap method to enhance the production of antioxidant metabolites and enzymes from bacteria for potential application as functional additives to foods and pharmaceuticals. We investigated the physiological and biochemical responses of four bacterial isolates, which exhibited high tolerance to 20% NaCl (wt/vol), out of 27 bacterial strains isolated from Aushazia Lake, Qassim region, Saudi Arabia. The phylogenetic analysis of the 16S rRNA genes of these four isolates indicated that strains ST1 and ST2 belong to genus Bacillus, whereas strains ST3 and ST4 belong to genus Planococcus. Salinity stress differentially induced oxidative damage, where strains ST3 and ST4 showed increased lipid peroxidation, lipoxygenase, and xanthine oxidase levels. Consequently, high antioxidant contents were produced to control oxidative stress, particularly in ST3 and ST4. These two Planococcus strains showed increased glutathione cycle, phenols, flavonoids, antioxidant capacity, catalase, and/or superoxide dismutase (SOD). Interestingly, the production of glutathione by Planococcus strains was some thousand folds greater than by higher plants. On the other hand, the induction of antioxidants in ST1 and ST2 was restricted to phenols, flavonoids, peroxidase, glutaredoxin, and/or SOD. The hierarchical analysis also supported strain-specific responses. This is the first report that exploited salinity stress for promoting the production of antioxidants from bacterial isolates, which can be utilized as postbiotics for promising applications in foods and pharmaceuticals.
- Published
- 2020
- Full Text
- View/download PDF
50. Purpureocillium lilacinum strain AUMC 10620 as a biocontrol agent against the citrus nematode Tylenchulus semipenetrans under laboratory and field conditions
- Author
-
Amr M. El-Marzoky, Ahmed S. M. Elnahal, Muthana M. Jghef, Mohammed A. S. Abourehab, Khaled A. El-Tarabily, and Mohamed A. M. S. Ali
- Subjects
Plant Science ,Horticulture ,Agronomy and Crop Science - Abstract
Three concentrations (1.25, 2.5, and 5 × 107 spores ml−1) (of the biocontrol fungus Purpureocillium lilacinum (strain AUMC 10620) were tested on citrus nematode Tylenchulus semipenetrans under in vitro and field conditions. Larvae and eggs were exposed to the fungal spores in vitro for 24, 48, and 72 h, and the findings were recorded at each time point. These results were compared with the application of the nematicide abamectin. Strain AUMC 10620 effectively reduced larval activity and egg hatching of T. semipenetrans under laboratory conditions. The highest concentration (5× 107 spores ml−1) of P. lilacinum, resulted in 89.01% immobility in the larvae, compared to abamectin, which resulted in 65.93% immobility after 48 h of exposure. These percentages of immobility were increased after 72 h of exposure (100 and 85.09%) when P. lilacinum at a concentration of 5 × 107 spores ml−1 and abamectin were used, respectively. On the other hand, the two other P. lilacinum concentrations (1.25, and 2.5 × 107 spores ml−1) affected the T. semipenetrans larvae to a lesser extent. The highest fungal concentration 5× 107 spores ml−1 inhibited the hatching of T. semipenetrans eggs in vitro with 71.34, 80, and 86.67% after 24, 48 and 72 h of treatment compared to the abamectin treatment which showed 76.67, 78, and 87% after the abovementioned periods, respectively. In addition, the application of P. lilacinum (5 × 107 spores ml−1) or abamectin under field conditions significantly (P T. semipenetrans, Tylenchorhynchus spp., Helicotylenchus spp., and Pratylenchus spp.) infesting citrus after one, two, and three weeks of treatment compared to the control treatment but with no significant (P > 0.05) differences between the two treatments. Three weeks after the field application, the percentage of nematode reduction was significantly (P 7 spores ml−1, respectively, by 78.42, 64.03, and 58.35%. It is evident from these results that the application of P. lilacinum strain (AUMC 10620) can be used in integrated pest management programs to control nematodes infesting citrus trees. Graphical abstract
- Published
- 2023
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.