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Article ; Online: Enhanced efficiency of flexible organic polymer solar cells by incorporation of titanium dioxide nanoparticles

Manal A. Awad / Awatif A. Hindi / Khalid M.O. Ortashi / Meznah M. Alanazi / Albandari W. Alrowaily / Taghreed Bahlool / Fatma Aouaini

Journal of King Saud University: Science, Vol 35, Iss 5, Pp 102690- (2023)

2023

Abstract: Solar power has quickly become one of the most effective forms of renewable energy today as it provides a clean solution to the growing demand for energy. Most solar panels in the market are rigid as they are made up of metals; therefore, organic ... ...

Abstract	Solar power has quickly become one of the most effective forms of renewable energy today as it provides a clean solution to the growing demand for energy. Most solar panels in the market are rigid as they are made up of metals; therefore, organic polymers provide a flexible alternative. Nanotechnology provides the synthesis of nanoparticles by simple approaches suitable for applications in various fields. Nanoparticles of titanium dioxide (TiO2) were synthesized and characterized in this paper (NPs), which were further incorporated in the construction of a novel, organic polymer solar panel (OPSC) that is flexible and portable; it is made from thylakoid (chloroplast) extract of chard (B. vulgaris subsp. cicla) combined with polystyrene polymer matrix. Insertion of TiO2 NPs in the OPSC improved the current generation compared to the reference devices (OPSC) without TiO2 NPs. Therefore possible uses for the constructed solar panel were suggested. The prepared films were tested for the current generation. Under illumination, the solar panels generated a current of −140 µAp, and −213 µAp without and within TiO2 NPs, respectively. This study opens windows for manufacturing flexible, efficient, and stable organic polymer solar panels.
Keywords	Characterization ; Polymer solar panel ; Chloroplasts ; Titanium dioxide ; Nanoparticles ; Science (General) ; Q1-390
Subject code	600
Language	English
Publishing date	2023-07-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Wet chemical synthesis and characterization of FeVO4 nanoparticles for super capacitor as energy storage device

Manal A. Awad / Awatif A. Hendi / Sarala Natarajan / Khalid M.O. Ortashi / Sarah S.A. Alsaif / Reema A. Alnamlah / Abeer Rasheed / Hayat Althobaiti

Journal of King Saud University: Science, Vol 35, Iss 8, Pp 102857- (2023)

2023

Abstract: Vanadates of transition metal found its potential applications in the fields of lithium ion batteries, gas sensors, photo catalysts, solar cells and so on. Among the metal vanadates, Iron vanadate is vital as an organic pollutant remedying, gas sensor ... ...

Abstract	Vanadates of transition metal found its potential applications in the fields of lithium ion batteries, gas sensors, photo catalysts, solar cells and so on. Among the metal vanadates, Iron vanadate is vital as an organic pollutant remedying, gas sensor material, and selective catalytic reduction material. This current research focuses on synthesizing iron vanadate nanoparticles by wet chemical synthesis with controlled pH using ammonia solution. The nanostructured FeVO4 particle were characterized structurally with the powder XRD studies. Strong crystal planes were formed at Miller indices (111), (0–12), and (−220) which is confirmed from the intensity of the diffraction peaks. FT- IR and micro Raman studies was taken to identify the molecular vibrations present in the material and it shows that the sharpest apex at 508 cm−1 obtained is attributed to the stretching oscillations of Fe–O and V–O–V modes. The Raman spectrum confirmed the separation of Fe − O, V − O, and different stretching fashions of V − O − Fe. The V–O stretching mode increases the intense bands showing the very high strongest peak of FeVO4 because of electro negativity of iron the metal. The morphology of iron vanadate was confirmed with SEM analysis showing that particles are much isolated and cubical with few polyhedron structures. The electrochemical response of FeVO4 evaluated the specific capacitance at 10 mV/s as 402 Fg−1.Energy density values were calculated as 16.08 Whkg−1, 13.08 Whkg−1, 10.2 Whkg−1, 8.76 Whkg−1, 7.64 Whkg−1 and 6.92 Whkg−1 from the cyclic voltammetry profile at the slow rates varying from 10 −100 mV/s. The magnetic properties were analyzed by measuring the magnetic susceptibility and magnetization using a VSM magnetometer and the results evident that the material exhibits the paramagnetic behavior.
Keywords	FeVO4 Nanoparticles ; Controlled pH ; Specific Capacitance ; Paramagnetic Nature ; Science (General) ; Q1-390
Subject code	620
Language	English
Publishing date	2023-11-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Green synthesis of Moringa oleifera leaf nanoparticles and an assessment of their therapeutic potential

Promy Virk / Manal A. Awad / Sarah Saleh Abdu-llah Alsaif / Awatif A. Hendi / Mai Elobeid / Khalid Ortashi / Rabia Qindeel / Manal F. El-Khadragy / Hany M. Yehia / Mohamed Ferkry Serag EL-DIN / Hatem Ali Salama

Journal of King Saud University: Science, Vol 35, Iss 3, Pp 102576- (2023)

2023

Abstract: The present study centered around the prospect of bio fabricating nanoparticles using Moringa oleifera leaf and investigating their therapeutic potential with an assessment of the antioxidant status. Synthesis of stable ‘green’ nanoparticles of Moringa ... ...

Abstract	The present study centered around the prospect of bio fabricating nanoparticles using Moringa oleifera leaf and investigating their therapeutic potential with an assessment of the antioxidant status. Synthesis of stable ‘green’ nanoparticles of Moringa leaf extract is successfully reported with an extensive characterization. The average particle size and polydispersity index (PDI) of the nanoparticles obtained by Dynamic light scattering (DLS) analysis were 141.6 nm and a polydispersity index (PDI) of 0.32 respectively. The UV–visible spectroscopy (UV–vis) revealed a strong red absorbance peak at 664 nm,characteristic of chlorophyll. Electron micrographs confirmed that particles were in the nano range and were spherical with minimal agglomeration. The constituent functional groups were assessed by Fourier transformed infrared spectroscopy (FTIR). The X-ray diffractograms of reflected both the amorphous and crystalline domains.Furthermore, the phytochemical screening showed a higher phenolic/ flavonoid content of the Moringa nanoparticles (NMo) in comparison to the bulk Moringa leaf extract(Mo). These results corresponded to a potent antioxidant status of the NMo which was assessed by three complementary antioxidant assays. The therapeutic potential of the nanoparticles was evaluated based on in vitro anti-diabetic assays and cytotoxicity assay on human cancer cell lines (MCF-7 and HepG-2). The key findings suggest a more profound therapeutic efficacy of NMo than the Moringa leaf extract.
Keywords	Moringa oleifera ; Green synthesis ; Antioxidant ; Phytochemical profile ; Anti-diabetic ; Anticancer ; Science (General) ; Q1-390
Subject code	500
Language	English
Publishing date	2023-04-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: The impact of environmental and climate parameters on the incidence and mortality of COVID-19 in the six Gulf Cooperation Council countries

Basema Saddik / Manal A Awad / Najlaa Al-Bluwi / Amal Hussein / Ankita Shukla / Arwa Al-Shujairi / Hamzah AlZubaidi / Mohamed S Al-Hajjaj / Rabih Halwani / Qutayba Hamid

PLoS ONE, Vol 17, Iss 7, p e

A cross-country comparison study.

2022 Volume 0269204

Abstract: Background Environmental factors can influence the epidemiological dynamics of COVID-19. To estimate the true impact of these factors on COVID-19, climate and disease data should be monitored and analyzed over an extended period of time. The Gulf ... ...

Abstract	Background Environmental factors can influence the epidemiological dynamics of COVID-19. To estimate the true impact of these factors on COVID-19, climate and disease data should be monitored and analyzed over an extended period of time. The Gulf Cooperation Council (GCC) countries are particularly lacking in such studies. This ecological study investigates the association between climate parameters and COVID-19 cases and deaths in the GCC. Methods Data on temperature, wind-speed and humidity and COVID-19 cases and deaths from the six countries of the GCC were collected between 29/1/2020 and 30/3/2021. Using Spearman's correlation coefficient, we examined associations between climate parameters and COVID-19 cases and deaths by month, over four different time periods. A two-step cluster analysis was conducted to identify distinct clusters of data using climate parameters and linear regression analysis to determine which climate parameters predicted COVID-19 new cases and deaths. Results The United Arab Emirates (UAE) had the highest cumulative number of COVID-19 cases while Bahrain had the highest prevalence rate per 100,000. The Kingdom of Saudi Arabia (KSA) reported the highest cumulative number of deaths while Oman recorded the highest death rate per 100,000. All GCC countries, except the UAE, reported a positive correlation between temperature and cases and deaths. Wind speed was positively correlated with cases in Qatar, but negatively correlated with cases in the UAE and deaths in KSA. Humidity was positively correlated with cases and deaths in Oman, negatively correlated in Bahrain, Kuwait, Qatar and KSA but there was no correlation in the UAE. The most significant predictors in cluster analysis were temperature and humidity, while in the regression analysis, temperature, humidity and wind speed predicted new COVID-19 cases and deaths. Conclusion This study provides comprehensive epidemiological information on COVID-19 and climate parameters and preliminary evidence that climate may play a key role in the ...
Keywords	Medicine ; R ; Science ; Q
Subject code	333
Language	English
Publishing date	2022-01-01T00:00:00Z
Publisher	Public Library of Science (PLoS)
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: In Silico Studies on Zinc Oxide Based Nanostructured Oil Carriers with Seed Extracts of Nigella sativa and Pimpinella anisum as Potential Inhibitors of 3CL Protease of SARS-CoV-2

Awatif A. Hendi / Promy Virk / Manal A. Awad / Mai Elobeid / Khalid M. O. Ortashi / Meznah M. Alanazi / Fatemah H. Alkallas / Maha Mohammad Almoneef / Mohammed Aly Abdou

Molecules, Vol 27, Iss 13, p

2022 Volume 4301

Abstract: Coming into the second year of the pandemic, the acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and its variants continue to be a serious health hazard globally. A surge in the omicron wave, despite the discovery of the vaccines, has shifted the ... ...

Abstract	Coming into the second year of the pandemic, the acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and its variants continue to be a serious health hazard globally. A surge in the omicron wave, despite the discovery of the vaccines, has shifted the attention of research towards the discovery and use of bioactive compounds, being potential inhibitors of the viral structural proteins. The present study aimed at the green synthesis of zinc oxide (ZnO) nanoparticles with seed extracts of Nigella sativa and Pimpinella anisum —loaded nanostructured oil carriers (NLC)—using a mixture of olive and black seed essential oils. The synthesized ZnO NLC were extensively characterized. In addition, the constituent compounds in ZnO NLC were investigated as a potential inhibitor for the SARS-CoV-2 main protease (3CLpro or Mpro) where 27 bioactive constituents, along with ZnO in the nanostructure, were subjected to molecular docking studies. The resultant high-score compounds were further validated by molecular dynamics simulation. The study optimized the compounds dithymoquinone, δ-hederin, oleuropein, and zinc oxide with high docking energy scores (ranging from −7.9 to −9.9 kcal/mol). The RMSD and RMSF data that ensued also mirrored these results for the stability of proteins and ligands. RMSD and RMSF data showed no conformational change in the protein during the MD simulation. Histograms of every simulation trajectory explained the ligand properties and ligand–protein contacts. Nevertheless, further experimental investigations and validation of the selected candidates are imperative to take forward the applicability of the nanostructure as a potent inhibitor of COVID-19 (Coronavirus Disease 2019) for clinical trials.
Keywords	coronavirus ; Nigella sativa ; Pimpenella anisum ; molecular docking ; molecular dynamic simulation ; zinc oxide nanoparticles ; Organic chemistry ; QD241-441
Subject code	540
Language	English
Publishing date	2022-07-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Protective effect of probiotic bacteria and its nanoformulation against cadmium-induced oxidative stress in male Wistar rat

Amenah Mohmmad Monadi Al-Enazi / Promy Virk / Awatif Hindi / Manal. A. Awad / Mai Elobeid / Rabia Qindeel

Journal of King Saud University: Science, Vol 32, Iss 7, Pp 3045-

2020 Volume 3051

Abstract: The present study assessed the ameliorative potential of a commercial probiotic, Protexin® and its nanoformulation against cadmium (Cd) toxicity in Wistar rats. The ‘green’ synthesized nanoparticles had a size of 170 nm (PDI 0.527) with spherical and ... ...

Abstract	The present study assessed the ameliorative potential of a commercial probiotic, Protexin® and its nanoformulation against cadmium (Cd) toxicity in Wistar rats. The ‘green’ synthesized nanoparticles had a size of 170 nm (PDI 0.527) with spherical and tubular bacillary shapes. Rats were exposed to 70 ppm of cadmium chloride hydrate for 35 days. Group I and V were negative and positive control respectively. Groups II, III, and IV were exposed to Cd. The Cd exposed groups, III and IV were treated with the probiotic and nanoprobiotic (1 ml containing 2 × 108cfu) respectively. Cd intoxication led to significant bioaccumulation of cadmium in liver and kidney. A significant increase in the serum malondialdehyde (MDA) and 8 -hydroxydeoxyguanosine (8-OHdG) levels was observed. The metallothionien (MT) and reduced glutathione (GSH) levels in the liver were significantly increased. The advance oxidation protein products (AOPP) and methylglyoxal (MG) levels were also elevated. Treatment with probiotic and its nanoparticles markedly reversed the Cd induced alterations in the parameters. The nanoformulation was more profound in reducing the (GSH) and MT levels in the liver and 8-OHdG levels in the serum. The key findings suggest that a nutritional intervention in the form of probiotic supplementation is a safe and efficacious remediation against heavy metal toxicity/oxidative stress.
Keywords	Cadmium ; Probiotics ; Nanoparticles ; Oxidative stress ; Science (General) ; Q1-390
Subject code	500
Language	English
Publishing date	2020-10-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Multifunctional green silver nanoparticles in pharmaceutical and biomedical applications

Najla AlMasoud / Taghrid S. Alomar / Manal A. Awad / Maha F. El-Tohamy / Dina A. Soliman

Green Chemistry Letters and Reviews, Vol 13, Iss 4, Pp 316-

2020 Volume 327

Abstract: The present study concerned with the use of an aqueous ginger extract as naturally and eco-friendly reducing and stabilizing agent in the synthesis of silver nanoparticles (AgNPs). The unique physicochemical characteristics of green synthesized AgNPs ... ...

Abstract	The present study concerned with the use of an aqueous ginger extract as naturally and eco-friendly reducing and stabilizing agent in the synthesis of silver nanoparticles (AgNPs). The unique physicochemical characteristics of green synthesized AgNPs exhibit high potential antimicrobial activity and displayed an impact role in pharmaceutical determinations. To confirm the nanoscale of green synthesized AgNPs, various microscopic and spectroscopic techniques were performed. The synthesized nanoparticles were screened for their antimicrobial activity against several strains of bacteria and fungi. The obtained results showed excellent bactericidal and fungicidal effects. Also, the spectrofluorimetric analysis of anastrozole drug in bulk powder and dosage form was investigated. The suggested method displayed linear relationship between the drug concentrations and the fluorescence intensity between 2 and 100 µgmL−1 with regression equation was IFL = 9.1917C+ 65.945, n = 10 and r = 0.9995 at λex 390 and λem 440 nm. The green synthesized AgNPs using ginger extract demonstrated a potential activity in pharmaceutical and biomedical fields.
Keywords	silver nanoparticles ; photoluminescence ; green chemistry ; biomedical applications ; ginger extract ; Science ; Q ; Chemistry ; QD1-999
Subject code	540
Language	English
Publishing date	2020-10-01T00:00:00Z
Publisher	Taylor & Francis Group
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Prevalence and determinants of overweight/obesity among school-aged adolescents in the United Arab Emirates

Wegdan Baniissa / Hadia Radwan / Rachel Rossiter / Randa Fakhry / Nabeel Al-Yateem / Arwa Al-Shujairi / Soultana Macridis / Abeer A Farghaly / Lin Naing / Manal A Awad

BMJ Open, Vol 10, Iss

a cross-sectional study of private and public schools

2020 Volume 12

Abstract: Objectives To estimate the prevalence and predictors of obesity among adolescents in the United Arab Emirates.Design Cross-sectional study.Setting Private and public secondary schools.Participants Adolescents aged 13–19 years; 434 (46.6%) from private ... ...

Abstract	Objectives To estimate the prevalence and predictors of obesity among adolescents in the United Arab Emirates.Design Cross-sectional study.Setting Private and public secondary schools.Participants Adolescents aged 13–19 years; 434 (46.6%) from private schools and 498 (53.4%) from public schools.Measures Self-report questionnaires were used to assess adolescents’ sociodemographic factors, fruit/vegetable (F/V) intake and physical activity. Participants’ weight, height, waist circumference (WC), hip circumference and body fat percentage () were measured, and waist-to-height ratio (WHtR), waist-to-hip ratio (WHR) and body mass index (BMI) were calculated. Overweight/obesity was determined by BMI ≥85th percentile for age, abdominal obesity (AO) (WC, WHtR and WHR) and .Results A total of 34.7% of participants were overweight/obese (BMI ≥85th percentile) and 378 (40.6%) had high . AO was noted in 47.3%, 22.7% and 27.1% of participants, based on WC, WHR and WHtR, respectively. Significantly more participants from public schools were overweight/obese (37.8% vs 31.1%) and had greater AO (based on WC, WHR, WHtR) compared with those from private schools. Predictors of obesity based on BMI were: consuming less than five servings of F/V (adjusted OR (AOR) 2.41, 95% CI: 1.73 to 3.36), being physically inactive (AOR 2.09, CI: 1.36 to 3.22) and being men (AOR 3.35, 95% CI: 2.20 to 5.10). Predictors of AO were being men (WC: AOR 1.42, 95% CI: 1.01 to 2.00; WHtR: AOR 2.72, 95% CI: 1.81 to 4.08); studying at public school (WHR: AOR 1.67, 95% CI: 1.06 to 2.66); being Emirati (WHR: AOR 0.62, 95% CI: 0.43 to 0.90); consuming less than five servings of F/V (WC: AOR 1.71, 95% CI: 1.27 to 2.30; WHtR: AOR 1.46, 95% CI: 1.05 to 2.03), and being physically inactive (WC: AOR 1.63; 95% CI: 1.13 to 2.35).Conclusions Focused interventions are needed to combat obesity while considering AO indicators and BMI to diagnose obesity in adolescents.
Keywords	Medicine ; R
Subject code	796
Language	English
Publishing date	2020-12-01T00:00:00Z
Publisher	BMJ Publishing Group
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Characterization and biological investigation of silver nanoparticles biosynthesized from Galaxaura rugosa against multidrug-resistant bacteria

Raghad R. Alzahrani / Manal M. Alkhulaifi / Nouf M. Alenazi / Nawal M. Almusayeib / Musarat Amina / Manal A. Awad / Aarif H. Elmubarak / Noura S. Aldosari

Journal of Taibah University for Science, Vol 14, Iss 1, Pp 1651-

2020 Volume 1659

Abstract: Bacterial drug resistance poses a global challenge to established antibacterial prevention and treatment schemes. Recent approaches focus on raising algal extracts' efficacy by fusing them to other antibacterial agents employing nanotechnology. Here, we ... ...

Abstract	Bacterial drug resistance poses a global challenge to established antibacterial prevention and treatment schemes. Recent approaches focus on raising algal extracts' efficacy by fusing them to other antibacterial agents employing nanotechnology. Here, we successfully biosynthesized AgNPs using Galaxaura rugosa crude methanol extract (AgNPCR) and raw powder aqueous (AgNPAQ) solution. The resultant AgNPs were characterized using UV-visible spectroscopy, Fourier-transform infrared spectroscopy, dynamic light scattering, and transmission electron microscopy. The AgNPs were spherical and ranged between 60 to 114.4 nm. The presence of the hydroxyl group and alkenes propped AgNPs biosynthesis. We investigated AgNPs antibacterial and antibiofilm activity against eighteen medically important bacteria, including multidrug-resistant bacteria. The sensitive and resistant Acinetobacter baumannii and Staphylococcus aureus were the most affected strains. The biofilm of MDR strains was mostly disturbed, indicating the reduced bacterial fitness in resistant strains. These results may aid antibacterial agents' development by investing in natural resources available abundantly in our environment.
Keywords	natural extracts ; red algae ; silver nanoparticles ; biofilm ; multidrug resistance ; bacterial fitness ; Science (General) ; Q1-390
Language	English
Publishing date	2020-01-01T00:00:00Z
Publisher	Taylor & Francis Group
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Green synthesis of silver nanoparticles using Citrus limon peels and evaluation of their antibacterial and cytotoxic properties

Manal M. Alkhulaifi / Jamilah H. Alshehri / Moudi A. Alwehaibi / Manal A. Awad / Nouf M. Al-Enazi / Noura S. Aldosari / Ashraf A. Hatamleh / Neveen Abdel- Raouf

Saudi Journal of Biological Sciences, Vol 27, Iss 12, Pp 3434-

2020 Volume 3441

Abstract: The present work aimed to synthesis silver nanoparticles (AgNPs) using biological waste products Citrus limon peels, its characterization, antimicrobial activities and the cytotoxic effect of the synthesized green AgNPs. Characterization of the prepared ... ...

Abstract	The present work aimed to synthesis silver nanoparticles (AgNPs) using biological waste products Citrus limon peels, its characterization, antimicrobial activities and the cytotoxic effect of the synthesized green AgNPs. Characterization of the prepared AgNPs showed the formation of spherical, and few agglomerated AgNPs forms as measured by UV–visible spectrophotometer. The average size of the prepared AgNPs was 59.74 nm as measured by DLS technique. The spectrum of the synthesized AgNPs was observed at 3 KeV using the EDX. On the other hand, FTIR analysis of the green synthesized AgNPs showed the presence of alcohols, phenolics, mono-substituted alkynes, aliphatic primary amines, sodium salt, amino acid, or SiOH alcohol groups. The antimicrobial studies of the formed AgNPs showed positive activity against most of the studied human pathogenic bacteria with varying degrees. Finally, the evaluation of the cytotoxic effect of the green synthesized AgNPs were done using two types of cell lines, human breast cancer cell line (MCF-7) and human colon carcinoma cell line (HCT-116). The results revealed the concentration has a direct correlation with cell viability. The 50% inhibitory concentration (IC50) of MCF-7 cell line was in of 23.5 ± 0.97 µL/100 µL, whereas the HCT-116 cell line was in 37.48 ± 5.93 µL/100 µL.
Keywords	Green Silver nanoparticles ; Citrus limon peels ; Antibacterial activity ; Cytotoxic activity ; Breast cancer ; Carcinoma cell line ; Biology (General) ; QH301-705.5
Language	English
Publishing date	2020-12-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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