المؤلفون: Shawky, Amira M., Elshypany, Rania, El Sharkawy, Heba M., Mubarak, Mahmoud F., Selim, Hanaa

المساهمون: Egyptian Petroleum Research Institute

المصدر: Scientific Reports ; volume 14, issue 1 ; ISSN 2045-2322

مصطلحات موضوعية: Multidisciplinary

الوصف: The tertiary composite of TiO 2 /CuO @ Ag (TCA) were synthesized by the solid state method using different ratios of TiO 2 /CuO NCs and Ag NPs. The structural, morphological, and optical properties of nanocomposites were analyzed by scanning electron microscope, Transmission electron microscope, X-ray diffraction, Fourier transform infrared spectra, UV–Vis diffuse reflectance spectra (UV–Vis/DRS) and photoluminescence spectrophotometry. The results showed enhanced activity of TCA hybrid nano crystals in oxidizing MB in water under visible light irradiation compared to pure TiO 2 . The photocatalytic performance TCA samples increased with suitable Ag content. The results show that the photo degradation efficiency of the TiO 2 compound improved from 13 to 85% in the presence of TiO 2 –CuO and to 98.87% in the presence of Ag containing TiO 2 –CuO, which is 7.6 times higher than that of TiO 2 . Optical characterization results show enhanced nanocomposite absorption in the visible region with long lifetimes between e/h+ at optimal TiO 2 –CuO/Ag (TCA 2 ) ratio. Reusable experiments indicated that the prepared TCA NC photo catalysts were stable during MB photo degradation and had practical applications for environmental remediation.

الإتاحة: https://doi.org/10.1038/s41598-024-52454-0Test
https://www.nature.com/articles/s41598-024-52454-0.pdfTest
https://www.nature.com/articles/s41598-024-52454-0Test

المؤلفون: El‐Sharkawy, A. M., Tewari, N., Vohra, R. S., Pasquali, S., Kirkham, A. J., Marriott, P., Johnstone, M., Spreadborough, P., Alderson, D., Griffiths, E. A., Fenwick, S., Elmasry, M., Nunes, Q., Kennedy, D., Basit Khan, R., Khan, M. A., Magee, C. J., Jones, S. M., Mason, D., Parappally, C. P., Mathur, P., Saunders, M., Jamel, S., Ul Haque, S., Zafar, S., Shiwani, M. H., Samuel, N., Dar, F., Jackson, A., Lovett, B., Dindyal, S., Winter, H., Fletcher, T., Rahman, S., Wheatley, K., Nieto, T., Ayaani, S., Youssef, H., Nijjar, R. S., Watkin, H., Naumann, D., Emeshi, S., Sarmah, P. B., Lee, K., Joji, N., Heath, J., Teasdale, R. L., Weerasinghe, C., Needham, P. J.

المصدر: World Journal of Surgery ; volume 47, issue 4, page 1082-1082 ; ISSN 0364-2313 1432-2323

الإتاحة: https://doi.org/10.1007/s00268-023-06911-yTest

المؤلفون: Abbas, Mahmoud Mahrous M., EL-Sharkawy, Salah M., Mohamed, Hassan R., Elaraby, Bassem E., Shaban, Walaa M., Metwally, Metwally G., Farrag, Diaa M. G.

المساهمون: Open access funding provided by The Science, Technology & Innovation Funding Authority (STDF) in cooperation with The Egyptian Knowledge Bank (EKB)., Al-Azhar University

المصدر: Biological Trace Element Research ; ISSN 0163-4984 1559-0720

مصطلحات موضوعية: Biochemistry (medical), Inorganic Chemistry, Clinical Biochemistry, General Medicine, Biochemistry, Endocrinology, Diabetes and Metabolism

الوصف: Metal pollution is a major environmental concern worldwide, especially in Egypt. The aquaculture industry uses widespread artificial feeds to stimulate fish production, leading to metal accumulation in the aquatic environment. Heavy metal concentrations (HMCs) in sediments, water, and tissues were studied to study the effect of pollution levels on heamatological, and biochemical, immunological aspects of farmed fish as well as on human health. Results declared that the HMC levels in the water and sediment were significantly different between El-Sharkia and Kafr El-Sheikh fishponds (T-test, p < 0.05). This was supported by the metal pollution index in the water and sediment, indicating that El-Sharkia fishponds (ES fishponds) were more contaminated than Kafr El-Sheikh fishponds (KES fishponds). Also, HMCs in fish tissues were significantly increased in fish cultivated in ES fishponds than in KES fishponds. Haematological, immunological, and biochemical alterations of Bolti ( Oreochromis niloticus ) and Topara ( Chelon ramada ) fish were significantly different within the different fish species as well as the different fishponds. From the human health perspective, the THQ-HMC and HI-HMC associated with the consumption of muscle suggest a safe non-carcinogenic risk to human health. In contrast, cadmium poses a cancer risk to children who consume the muscular tissue of Bolti fish from ES fishponds, which should be regarded as a warning sign based on data indices and a human health perspective. In order to minimise HMC pollution in the aquaculture sector, it is advisable to take possible assessments and carry out continuous monitoring considering international WHO/FAO assessments.

الإتاحة: https://doi.org/10.1007/s12011-023-04007-1Test

المؤلفون: El-Sharkawy, Reyad M., Abbas, Mohamed H. H.

المساهمون: Benha University

المصدر: BMC Microbiology ; volume 23, issue 1 ; ISSN 1471-2180

مصطلحات موضوعية: Microbiology (medical), Microbiology

الوصف: Background The development of an environment-friendly nanomaterial with promising antimicrobial and antioxidant properties is highly desirable. The decolorization potentiality of toxic dyes using nanoparticles is a progressively serious worldwide issue. Methods The successful biosynthesis of zinc nanoparticles based on phosphates (ZnP-nps) was performed using the extracellular secretions of Aspergillus fumigatus . The antibacterial activity of the biosynthetic ZnP-nps was investigated against Gram-negative bacteria and Gram-positive bacteria using the agar diffusion assay method. The antioxidant property for the biosynthetic nanomaterial was evaluated by DPPH and H 2 O 2 radical scavenging assay. Results Remarkable antibacterial and antiradical scavenging activities of ZnP-nps were observed in a dose-dependent manner. The minimum inhibitory concentration (MIC) for Staphylococcus aureus , Pseudomonas aeruginosa , and Escherichia coli was 25 µg/ml, however, the MIC for Bacillus subtilis was 12.5 µg/ml. The maximum adsorptive performance of nanomaterial was respectively achieved at initial dye concentration of 200 mg/L and 150 mg/L using methylene blue (MB) and methyl orange (MO), where sorbent dosages were 0.5 g for MB and 0.75 g for MB; pH was 8.0 for MB and 4.0 for MO; temperature was 30 °C; contact time was 120 min. The experimental data was better obeyed with Langmuir’s isotherm and pseudo-second-order kinetic model (R 2 > 0.999). The maximum adsorption capacity (q max ) of MB and MO dyes on nanomaterial were 178.25 mg/g and 50.10 mg/g, respectively. The regenerated nanomaterial, respectively, persist > 90% and 60% for MB and MO after 6 successive cycles. The adsorption capacity of the prepared zinc phosphate nanosheets crystal toward MB and MO, in the present study, was comparable/superior with other previously engineered adsorbents. Conclusions Based on the above results, the biosynthesized ZnP-nanosheets are promising nanomaterial for their application in sustainable dye decolorization ...

الإتاحة: https://doi.org/10.1186/s12866-023-03054-xTest

المؤلفون: El Sharkawy, Heba M., Shawky, Amira M., Elshypany, Rania, Selim, Hanaa

المساهمون: Egyptian Petroleum Research Institute

المصدر: Scientific Reports ; volume 13, issue 1 ; ISSN 2045-2322

مصطلحات موضوعية: Multidisciplinary

الوصف: Investigate the use of visible light to improve photocatalytic degradation of organic pollutants in wastewater. Nitrogen-doped titania and molybdenum sulfide nanocomposites (NTM NCs) with different weight ratios of MoS 2 (1, 2, and 3 wt.%) synthesized by a solid state method applied to the photodegradation of methylene blue(MB) under visible light irradiation. The synthesized NTM composites were characterized by SEM, TEM, XRD, FT-IR, UV–Vis, DRS and PL spectroscopy. The results showed enhanced activity of NTM hybrid nanocrystals in oxidizing MB in water under visible light irradiation compared to pure TiO 2 . The photocatalytic performance of NTM samples increased with MoS 2 content. The results show that the photodegradation efficiency of the TiO 2 compound improved from 13 to 82% in the presence of N-TiO 2 and to 99% in the presence of MoS 2 containing N-TiO 2 , which is 7.61 times higher than that of TiO 2 . Optical characterization results show enhanced nanocomposite absorption in the visible region with long lifetimes between e/h+ at optimal N-TiO 2 /MoS 2 (NTM 2 ) ratio. Reusable experiments indicated that the prepared NTM NCs photocatalysts were stable during MB photodegradation and had practical applications for environmental remediation.

الإتاحة: https://doi.org/10.1038/s41598-023-35265-7Test
https://www.nature.com/articles/s41598-023-35265-7.pdfTest
https://www.nature.com/articles/s41598-023-35265-7Test

المؤلفون: El Sharkawy, Heba M., Elbanna, Abdussalam M., Khedr, Ghada E., Allam, Nageh K.

المصدر: Energy Advances ; volume 2, issue 12, page 2129-2139 ; ISSN 2753-1457

الوصف: The fabricated asymmetric supercapacitor device (Cu 3 Mn 1 OS//AC) exhibits a very high energy density of 76.56 W h kg −1 along with a power density of 985.01 W kg −1 at 1 A g −1 with superior electrochemical stability and efficiency over 10 000 cycles.

الإتاحة: https://doi.org/10.1039/d3ya00415eTest
http://pubs.rsc.org/en/content/articlepdf/2023/YA/D3YA00415ETest

المؤلفون: Ragheb, Mona, Shalaby, Afaf A., El-Sharkawy, Heba M.

المساهمون: is not any funding agency

المصدر: Egyptian Journal of Basic and Applied Sciences ; volume 10, issue 1, page 185-194 ; ISSN 2314-808X

الإتاحة: https://doi.org/10.1080/2314808x.2022.2164645Test

المؤلفون: Elgayar, Ahmed A., El-Sharkawy, Hamed M., El-Bindary, Amal S., Nassar, Mohamed A., Hamza, Mohamed B.

المصدر: Alexandria Journal of Pediatrics ; volume 37, issue 1, page 8-13 ; ISSN 1687-9945

الوصف: Background Vitamin D has a role in minimizing the extent of neuronal cell injury and death in neonatal hypoxic–ischemic encephalopathy (HIE). Aim To assess the serum level of vitamin D in full-term babies with HIE. Patients and methods This case–control study was conducted on 40 full-term neonates. Cases were grouped into two groups: group A: 30 full-term neonates diagnosed as HIE; clinical diagnosis was based on Sarnat staging. Group B: 10 healthy full-term neonates. Patients in group A were further subdivided into three equal groups: group A1: grade I HIE, group A2: grade II HIE, and group A3: grade III HIE. Results The following investigations were done for groups A and B: Apgar score after 1 and 5 min, convulsions, metabolic acidosis need for respiratory support, blood urea, serum creatinine, C-reactive protein level, serum calcium levels, and 25(OH) vitamin D measurements at 12 and 72 h postnatal. Apgar score, pH, total and ionized calcium, and 25(OH)-D were significantly reduced in HIE (specially grade III), while blood urea, serum creatinine, and C-reactive protein were significantly higher in HIE neonates (grade III). Conclusion We could assume that the more severe the grade of HIE, the worse are the laboratory findings.

الإتاحة: https://doi.org/10.4103/ajop.ajop_3_24Test

المؤلفون: Negm, Hani H, El-Sharkawy, Rehab M, Abdeltwab, Eslam, Mostafa, Massaud, Mahmoud, Mohamed E, El-Taher, Atef

المساهمون: Al Jouf University

المصدر: Physica Scripta ; volume 99, issue 5, page 055956 ; ISSN 0031-8949 1402-4896

الوصف: The study investigated new nanocomposites’ γ -ray and neutron shielding properties based on raw attapulgite, a clay matrix intercalated with different weight percentages of mixed nano metal oxides CdO and PbO. The various percentages were as follows: (100–2 x )% Attapulgite + x %CdO + x %PbO, abbreviated as (AT 100–2 x Cd x Pb x ), where x = 5, 10, 15%. The nanocomposites were characterized using XRD, FTIR, and EDX, confirming their successful preparation. SEM images revealed that the mixed oxide nanoparticles were successfully intercalated into the layers of attapulgite clay, with an average particle size of approximately 31.46 nm. The bulk densities of the prepared nanocomposites were measured to be in the range of 2.034 to 2.555 g/cm 3 . GEANT4 simulations were employed to evaluate the nanocomposites’ γ -ray and neutron shielding performance in the photon energy range of 0.015 to 15 MeV. Phys-X code was used for verification. The simulation results showed a maximum difference of approximately 9.5% between GEANT4 and Phys-X predictions. To assess the γ -ray shielding performance, various shielding parameters were calculated at selected photon energies. The μ m values ranged from 4.589 to 0.020 cm 2 .g −1 , 6.311 to 0.021 cm 2 .g −1 , 8.350 to 0.022 cm 2 .g −1 and 10.804 to 0.023 cm 2 .g −1 for raw attapulgite, AT 90 Pb 5 Cd 5 , AT 80 Pb 10 Cd 10 , AT 70 Pb 15 Cd 15 across the photon energy range. The AT 70 Pb 15 Cd 15 nanocomposite exhibited the highest μ m , Z eff , Z eq , and the lowest T 1/2 , T 1/10 , and MFP values. Notably, it also demonstrated the highest FNRCS (approximately 0.1 cm −1 ). These findings suggest that clay-based nanocomposites represent a new class of low-cost, locally available advanced materials with potential applications in γ -ray and neutron shielding characteristics.

الإتاحة: https://doi.org/10.1088/1402-4896/ad3b48Test

المؤلفون: Mahmoud, Mohamed E., El-Sharkawy, Rehab M., Allam, Elhassan A., Nabil, Gehan M., Louka, Febee R., Salam, Mohamed Abdel, Elsayed, Sarah M.

المصدر: Journal of Water Process Engineering ; volume 57, page 104625 ; ISSN 2214-7144

مصطلحات موضوعية: Process Chemistry and Technology, Waste Management and Disposal, Safety, Risk, Reliability and Quality, Biotechnology

الإتاحة: https://doi.org/10.1016/j.jwpe.2023.104625Test
https://api.elsevier.com/content/article/PII:S2214714423011455?httpAccept=text/xmlTest
https://api.elsevier.com/content/article/PII:S2214714423011455?httpAccept=text/plainTest