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Sara Khaled Ahmed(Sara Khaled Ahmed ),Gamal Mohamedin Hassan(Gamal Mohamedin Hassan ),Tharwat El dosoky Radwan(Tharwat El dosoky Radwan ) 한국축산식품학회 2022 Food and Life Vol.2022 No.2
Isolation of microorganisms capable of reducing toxic chromium (VI) into less toxic chromium (III) has been given attention due to their significance in bioremediation of the contaminated sites. Five isolates out of the twelve isolates were selected according to their abilities to grow in the presence of high concentration of chromium. From the five bacterial isolates, isolates FAYP2 and FAYP3 were selected according to their higher reduction percent of toxic chromium (VI) into chromium (III) and their reduction percent was 60% and 70% respectively. The isolates FAYP2 and FAYP3 were identified as Pseudomonas aeruginosa and Pseudomonas zhadogens, respectively, based on morphological and biochemical characterization and confirmed by molecular sequence analyses of amplified 16S rRNA genes with accession numbers OMO10239 and OMO019074. The results reveal that P. aeruginosa FAYP2 and P. zhadogens FAYP3 can be used for the bioremediation of wastewater effluent containing hexavalent chromium.
Sara Ahmed El‑Bahloul 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.20 No.1
Cast aluminum alloy A380 is one of the most commonly specified alloys that has light weight and exhibits excellent resistance to hot cracking, which makes it necessary in many industrial applications. An idea is investigated to generate a cylindrical bushing without significant petal formation and radial fracture that are expected to be obtained by friction drilling of cast metals. Three materials; namely, 316 stainless steel, Al6060 aluminum alloy, and red copper alloy are used in which each of them is located on the upper and lower surfaces of A380 workpiece, so achieving the idea of the functionally graded material. The process parameters were studied for reducing the resultant axial force, the gap between surfaces, and achieving a longer bushing without petal formation and radial fracture. Lower feed rate achieves minimum axial force and gap thickness with maximum bushing length for all material sandwiches. An optimized decision making by the help of fuzzy logic techniques is performed, revealing that red copper sandwich exhibits the optimal multiple performance characteristic index based on axial force, bushing length, gap thickness, and gap divergence.
Suzan Ahmed Elfiky,Shwikar Mahmoud Ahmed,Ahmed Mostafa Elmenshawy,Gehad Mahmoud Sultan,Sara Lotfy Asser 대한중환자의학회 2023 Acute and Critical Care Vol.38 No.1
Background Hospital-acquired infections (HAIs) are increasing due to the spread of multi-drug-resistant organisms. Gut dysbiosis in an intensive care unit (ICU) patients at admission showed an altered abundance of some bacterial genera associated with the occurrence of HAIs and mortality. In the present study, we investigated the pattern of the gut microbiome in ICU patients at admission to correlate it with the development of HAIs during ICU stay. Methods Twenty patients admitted to an ICU with a cross-matched control group of 30 healthy subjects of matched age and sex. Quantitative SYBR green real-time polymerase chain reaction was done for the identification and quantitation of selected bacteria. Results Out of those twenty patients, 35% developed ventilator-associated pneumonia during their ICU stay. Gut microbiome analysis showed a significant decrease in Firmicutes and Firmicutes to Bacteroidetes ratio in ICU patients in comparison to the control and in patients who developed HAIs in comparison to the control group and patients who did not develop HAIs. There was a statistically significant increase in Bacteroides in comparison to the control group. There was a statistically significant decrease in Bifidobacterium and Faecalibacterium prausnitzii and an increase in Lactobacilli in comparison to the control group with a negative correlation between Acute Physiology and Chronic Health Evaluation (APACHE) II score and Firmicutes to Bacteroidetes and Prevotella to Bacteroides ratios. Conclusions Gut dysbiosis of patients at the time of admission highlights the importance of identification of the microbiome of patients admitted at the ICU as a target for preventing of HAIs.
Moatmed, Sara M.,Khedr, Mohamed Hamdy,El-dek, S.I.,Kim, Hak-Yong,El-Deen, Ahmed G. Elsevier 2019 Journal of environmental chemical engineering Vol.7 No.6
<P><B>Abstract</B></P> <P>Due to increasing of oil spills and high organic contamination of marine environment, developing of cost-effective and rapid oil/water separation technique has become inevitable. Herein, freestanding and flexible hybrid polystyrene nanofibers are introduced as highly efficient hybrid membrane for ultrafast oil/water separation without external pressure. Typically, different loading of Fe<SUB>3</SUB>O<SUB>4</SUB> nanoparticles embedded into polystyrene nanofibers using electrospinning to fabricate superhydrophobic/super-oleophilic membrane. The morphological shape, crystal structure and surface wettability behavior were elucidated by field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and contact angel, respectively. The optimum loading of magnetite nanoparticles into the nanofiber membranes was investigated to achieve best separation performance. The obtained results demonstrated that the incorporation of (Fe<SUB>3</SUB>O<SUB>4</SUB>) nanoparticles into membrane has a significant impact for enhancing superhydrophobic properties and the separation efficiency against light and heavy oils. Among all formulations, the fabricated (PS@Fe<SUB>3</SUB>O<SUB>4</SUB>10 wt.%) membrane revealed ultrahigh flux (5000 L m<SUP>−2</SUP> h<SUP>−1</SUP>) with separation efficiency of 99.8 % for hexane under gravity driven process and excellent superhydrophobicity with water contact angle 162° moreover excellent reusability 98.5 % for 50 consecutive cycles. Interestingly, the proposed hybrid nanofiber membrane achieved distinct separation efficiencies 95 % and 92 % for food oils such as olive oil and sesame oil. Overall, the current study provides cost-effective and facile approach to distinctly improve the membrane performance for durable oil/water separation technique.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Olaniyi Arowojolu,Ahmed Ibrahim,Abdullah Almakrab,Nicholas Saras,Richard Nielsen 한국콘크리트학회 2021 International Journal of Concrete Structures and M Vol.15 No.3
The shear span-to-effective depth ratio (a/d) is one of the factors governing the shear behavior of reinforced concrete (RC) beams, with or without shear reinforcement. In high-strength concrete (HSC), cracks may propagate between the aggregate particles and result in a brittle failure which is against the philosophy of most design guidelines. The experimental results of six HSC beams, with and without shear reinforcement, tested under four-point bending with a/d ranged from 2.0 to 3.0 are presented and compared with different model equations in design codes. The a/d ratio has higher influence on the shear strength of reinforced HSC beams without shear reinforcement than beams with shear reinforcement. Most of the shear resistance prediction models underestimate the concrete shear strength of the beams but overpredict shear resistance of beams with shear reinforcement. However, the fib Model code 2010 accurately predicted the shear resistance for all the beams within an appropriate level of approximation (LoA).
Zhongjiu Zheng,Ning Wang,Sara Ahmed 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.4
In harsh marine environments, small variations in parameters of the underwater wireless charging system would lead to system detuning and dynamic fluctuation of DC output, thereby reducing power transfer efficiency and output performance. To achieve maximum efficiency tracking and DC output stabilizing, a decoupling control scheme bridging frequency tracking and DC output stabilizing for the wireless charging system of autonomous underwater vehicles (AUVs) is proposed. To be specific, the primary side of the wireless charging system adopts adaptive frequency tracking control (AFTC) to ensure that the operating frequency can always work near the resonant frequency during the charging process of the lithium battery. The secondary side adopts double closed-loop control of voltage and current based on buck converter such that the DC output can be stabilized for efficiently charging of lithium battery. Experimental results show that the proposed decoupling control scheme can realize frequency tracking on the primary side while the lithium battery can be charged with constant current and constant voltage, under maximum efficiency.
Senhaji, Nadia,Louati, Sara,Chbani, Laila,Bardai, Sanae El,Mikou, Karima,MAAROUFI, Mustafa,Benzagmout, Mohammed,Faiz, Mohammed Chaoui El,Marie, Yannick,Mokhtari, Karima,Idbaih, Ahmed,Amarti, Afaf,Benn Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.5
Background: Genetic alterations in gliomas have increasing importance for classification purposes. Thus, we are especially interested in studying IDH mutations which may feature potential roles in diagnosis, prognosis and response to treatment. Our aim was to investigate IDH mutations in diffuse glioma patients diagnosed in university hospital centre of Fez in Morocco. Materials and Methods: IDH1 codon 132 and IDH2 codon 172 were direct-sequenced in 117 diffuse glioma samples diagnosed and treated in University Hospital Hassan II between 2010 and 2014. Results: The R132H IDH1 mutation was identified in 43/117 tumor samples and R172K IDH2 mutation was detected in only one anaplastic oligodendroglioma. IDH mutations were observed in 63.2% of astrocytomas, 73.3% of diffuse oligodendrogliomas and 12.90% of glioblastomas. Conclusions: Our results confirmed other studies published earlier for other populations with some small discrepancies.