King Saud University
  • Riyadh, Riyadh, Saudi Arabia
Recent publications
In this paper, we report on the semileptonic transitions of Bs→Ds2(2900)lν‾l, where l=e,μ,orτ with JP=2− by using the QCD sum rules within the standard model (SM). These channels which defined by the low energy Hamiltonian are calculated based on the transition form factors entering the hadronic matrix element. The form factors are obtained by using suitable fit functions that are then utilized to evaluate the total decay widths (TDW) and branching ratios of Bs→Ds2eν‾e=1.112×10−3,Bs→Ds2μν‾μ=1.093×10−3 and Bs→Ds2τν‾τ=7.412×10−6. The present results are consistent with the predications of the standard model as well as with the results of several studies on different channels. Therefore, such studied transition is promising to be achieved in the near future at LHCb experiment in CERN.
In this study, different assortments of 2-arylquinolines and 2,6-diarylquinolines have been developed. Recently, we have developed a new series of 6,7-dimethoxy-4-alkoxy-2-arylquinolines as Topoisomerase I (TOP1) inhibitors with potent anticancer activity. Utilising the SAR outputs from this study, we tried to enhance anticancer and TOP1 inhibitory activities. Though target quinolines demonstrated potent antiproliferative effect, specifically against colorectal cancer DLD-1 and HCT-116, they showed weak TOP1 inhibition which may be attributable to their non-coplanarity. Thereafter, screening against kinase panel revealed their dual inhibitory activity against EGFR and FAK. Quinolines 6f, 6h, 6i, and 20f were the most potent EGFR inhibitors (IC50s = 25.39, 20.15, 22.36, and 24.81 nM, respectively). Meanwhile, quinolines 6f, 6h, 6i, 16d, and 20f exerted the best FAK inhibition (IC50s = 22.68, 14.25, 18.36, 17.36, and 15.36 nM, respectively). Finally, molecular modelling was employed to justify the promising EGFR/FAK inhibition. The study outcomes afforded the first reported quinolines with potent EGFR/FAK dual inhibition.
This research was a qualitative exploration of seven graduate students’ lived experiences with the use of social media (SM) as a learning space. An integrated thematic analysis based on data provided via interviews, observations, and artifacts yielded 13 main themes, offering a rich description of participants’ experiences with using SM for advanced formal learning. The participants had varying ideas about definitions of SM, indicating that establishing clarity with respect to SM as a concept is important to both research and the practical integration of SM applications in advanced learning contexts. Regardless of conceptual inconsistencies, these graduate students primarily reported positive experiences with using SM for graduate studies: major source of learning and motivating and engaging emerged as main themes. Themes related to cross-cultural aspects also emerged in that SM facilitates cross-cultural adaptation and increases global/cross-cultural communication and interaction skills. Themes for the primary advantages of SM were convenience, collaboration/connection, and transcends geographical boundaries. The primary disadvantages were that SM could be overwhelming/boring, distracting/time consuming, and involve interpersonal challenges. The credibility of resources can also be an issue. Main themes for suggestions included recommendations for educators’ integration of social media (for classwork) and students’ management of social media. The study provides novel insight into the use of SM for learning from graduate students representing different geographic and cultural perspectives. Importantly, the findings provide rich qualitative data that provide convergent support for the generalizability of the findings from quantitative survey studies as well as providing insight into how varying conceptualizations of SM can influence participants’ responses in research and their actual use of various applications.
On account of its crucial role in the virus life cycle, SARS-COV-2 NSP13 helicase enzyme was exploited as a promising target to identify a novel potential inhibitor using multi-stage structure-based drug discovery approaches. Firstly, a 3D pharmacophore was generated based on the collected data from a protein-ligand interaction fingerprint (PLIF) study using key interactions between co-crystallised fragments and the NSP13 helicase active site. The ZINC database was screened through the generated 3D-pharmacophore retrieving 13 potential hits. All the retrieved hits exceeded the benchmark score of the co-crystallised fragments at the molecular docking step and the best five-hit compounds were selected for further analysis. Finally, a combination between molecular dynamics simulations and MM-PBSA based binding free energy calculations was conducted on the best hit (compound FWM-1) bound to NSP13 helicase enzyme, which identified FWM-1 as a potential potent NSP13 helicase inhibitor with binding free energy equals −328.6 ± 9.2 kcal/mol.
The cell wall is a non-starch polysaccharide and consists of various bioactive moieties. In addition, it has many functional and nutraceutical properties. The main purpose of this present research was to extract the cell wall from different cereal bran and to characterize it for nutritional and bioactive properties. In addition, the effects of the cereal bran cell wall (CBCW) on functional and rheological properties of wheat flour were elucidated. For this purpose, the cell wall was extracted from different cereal bran (maize, oat, and wheat) via an enzymatic method and characterized for its monosacchar-ides and phenolic acids contents. Additionally, the rheological properties of wheat flour with the addition of CBCW were determined using the farino-graph and mixograph. The results showed that the cell wall contents in oat bran (43.31 ± 1.41%) were higher than those in wheat (41.53 ± 0.09%) and maize bran cell walls (37.31 ± 1.05%). The maize bran cell wall has higher arabinose, xylose, galactose, and glucuronic acid contents, followed by oat and wheat bran cell walls. Furthermore, the oat bran cell wall contained higher total phenolic acid contents as compared to maize and wheat bran. Nevertheless, the ferulic acid content was high in the maize bran cell wall. Moreover, incorporation (2%) of CBCW significantly improved the rheological properties of wheat flour. The water absorption (66.04 ± 0.23%), dough stability (4.54 ± 0.6 min), peak height (66.02 ± 0.03BU), and mixing tolerance index (70.02 ± 0.07%) were high in wheat flour with the addition of oat bran cell walls followed by wheat and maize bran cell walls. Furthermore, the dough development time (6.75 ± 0.25 min) was the highest in the control sample and the lowest mixing time was observed in C4 (5.41 ± 0.12 min), while the softness of dough (139.4 ± 0.02%) was decreased more significantly through the oat cell wall than wheat and maize. Conclusively, CBCW con-tained different bioactive moieties that have numerous positive effects on the rheological and functional properties of wheat flour.
Rumex nervosus leaves (RNL) and Cinnamomum verum bark (CNB), phytogenic herbs, have received much attention in recent years for their antimicrobial properties; however, there is limited knowledge about their potential anticoccidial functions. The prophylactic effects of RNL and CNB were compared with salinomycin, a standard synthetic anticoccidial agent, in broilers experimentally infected with Eimeria tenella (E. tenella). One-day-old broiler chicks (n = 225) were randomly divided into nine groups. Birds were either fed a basal diet containing 1, 3, or 5 g RNL or 2, 4, or 6 g CNB/kg feed, or treated with salinomycin within the basal diet, or the infected (IUT) or non-infected (UUT) groups were fed a basal diet only. Birds infected (n = 25 bird/group) with 40,000 sporulated E. tenella oocysts/bird at d 21 except UUT. Bodweight gain (BWG) and feed conversion ratio (FCR) were significantly (p < .05) lower in IUT compared to UUT. On day 7 post-infection (DPI), birds treated with RNL, CNB, or salinomycin had fewer lesions in the caeca and a lower oocyst value, and a higher oocyst reduction rate in the faeces than birds in the IUT. Although RNL was not able to reduce weight loss caused by coccidiosis, CNB at 6 g improved FCR and production efficiency index (PEI) at 7 DPI compared to the infected groups. In conclusion, RNL at 5 g and CNB at 6 g have moderate anti-coccidial activity and could be used to treat poultry coccidiosis in the field. However, more research is needed to identify active ingredients that make it effective compared to commercially available drugs.
Background: Blood transfusion is essential in the treatment of a wide range of illnesses. There are two sorts of donors in the blood donation system voluntary and replacement donors. Objectives: In this study, we examined Saudi adults’ knowledge, beliefs, and associated factors towards blood donation in Saudi Arabia. Methods: A cross-sectional web-based survey was conducted over three months between November 2019 & January 2020 among the general public, using structured selfadministered 18-items online questionnaires. A descriptive analysis was performed, a chisquare test was conducted to determine the relationships between the variables. A p-value <0.05 was considered statistically significant. Results: A total of 364 respondents (93.1%) believed that blood donation is an important responsibility of every individual. When asked about the reason for previous donations 261 (66.8%) said voluntary while approximately 130 (33.2%) donated for their families and friends. Fear of needles 91 (23.3%), fear of infection 53 (13.6%) a lack of time 88 (22.5%) were common barriers, and 270 (69.1%) agreed that token gifts should be given to donors. In this study, 71.1% (n = 278) were found to have good knowledge, and 96.7% (n = 378) found positive beliefs towards blood donation. The knowledge is significantly associated with being a male gender (p < 0.049), and the educational level of the participants (p < 0.003). positive beliefs were significantly associated with young donors (p < 0.045) Conclusion: These outcomes indicate that the Saudi public has positive beliefs and acceptable knowledge about blood donation and its importance in the society and health care system. Furthermore, educational programs should be done to increase the level of awareness about blood donation and its significance
Background: The cardiovascular crisis is advancing rapidly throughout the world. A large number of studies have shown that plant polyphenols affect major mechanisms involved in cardiovascular events through their action on the antioxidant system, signaling, and transcription pathways. D-limonene, a monocyclic monoterpene obtained from citrus fruits, is reported to possess many pharmacological activities. Methods: The experiment was designed to determine the protective effect of D-limonene against cardiac injury induced by CCl4 in Wistar rats. Rats were treated with two doses of D-limonene against cardiac injury induced by CCl4. Serum toxicity markers, cardiac toxicity biomarker enzymes, inflammatory mediators, anti-oxidant armory, lipid peroxidation, lipid profile, and histology were done. Results: CCl4 intoxication resulted in a substantial rise in FFA, TC, TG, PL, LDL, VLDL, and a reduction in HDL, restoring these changes with the administration of D-limonene at a dosage of 200 mg/kg. CCl4 administration also resulted in lipid oxidation and decreased antioxidant activity. At the same time, D-limonene at a dosage of 200 mg/kg body weight inhibited LPO and restored in vivo antioxidant components to normal. CCl4 intoxication also resulted in a significant increase in inflammatory markers like IL-6, TNF-α, high sensitivity Corticotropin Releasing Factor (Hs-CRF), and biomarkers of cardiac toxicity like alanine aminotransferase (ALT), lactate dehydrogenase (LDH), creatine kinase (CK), creatine kinase MB (CKMB), and Troponin I & troponin-t activities. D-limonene reversed all these changes to normal. Histology further confirmed our obtained results. Conclusion: These findings indicate that D-limonene can ameliorate cardiac injury at a 200 mg/kg body weight dosage. Henceforth, D-Limonene intervenes in mediating CCl4 induced toxicity by various signaling pathways. © 2022 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.
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14,414 members
Saja Almazrou
  • Department of Clinical Pharmacy
Mohd Javed Akhtar
  • King Abdullah Institute for Nanotechnology
Afif Hassairi
  • Department of Plant Production
11451, Riyadh, Riyadh, Saudi Arabia
Head of institution
Prof Dr. Badran A. Al-Omar
+966 11 4670888
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