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Amal G. Ramadan(Amal G. Ramadan ),Ahmed A. M. Yassein(Ahmed A. M. Yassein ),Eissa A. Eissa(Eissa A. Eissa ),Gamal M. Hassan(Gamal M. Hassan ) 한국축산식품학회 2022 Food and Life Vol.2022 No.3
Zinc oxide nanoparticles (ZnO-NPs) are regularly utilized in the food and fertilizers industries. In our investigation, rats received oral administration of ZnO NPs with a particle size of 30±5 nm once daily at doses of 100, 200, 300, 400, and 600 mg/kg for ten weeks in order to assess the genotoxic effect. Impacts on hematological markers, genotoxic impact, and growth were investigated. The findings showed that ZnO-NPs significantly reduced body weight gain, red blood cell count (RBC), hemoglobin concentration (Hb), hematocrit value (HCT), and platelet count (PLT), while increasing white blood cell (WBC), mean capsular volume (MCV), mean capsular hemoglobin (MCH), and mean capsular hemoglobin concentration (MCHC) in the treated rats. Our results for the comet assay and micronuclei test show a dosage-dependent increase in DNA fragmentation, which was supported by an increase in the percentage of DNA that is tailed, the length and intensity of DNA tails, and the tail moment, especially at the dose of 600 mg/kg. According to the findings, the frequency of micronucleated cells has increased.
Amal T. Abou Elghait,Tarek. M. Mostafa,Fatma K. Gameaa,Gamal K. Mohammed,Fatma Y. Meligy,Manal M. Sayed 대한해부학회 2022 Anatomy & Cell Biology Vol.55 No.3
As a synthetic analog of codeine, tramadol is often prescribed to treat mild to moderate pains. This study was designed to estimate and compare the histological effect of tramadol on testes of both juvenile and adult male albino mice. A total number of 40 healthy male albino mice were classified into two main groups as follows: group I (juvenile group, includes 20 mice aged three weeks) subdivided equally into group Ia (control group received isotonic saline) and group Ib (tramadol-treated group received 40 mg/kg/d tramadol orally for 30 days); group II (adult group, includes 20 mice aged two months) subdivided equally into group IIa (control group received isotonic saline) and group IIb (tramadol-treated group). Juvenile and adult tramadol-treated groups showed numerous testicular changes, including blood vessels congestion, widening of intercellular spaces, vacuolization in interstitial tissues, luminal germ cells exfoliation, and increased expression of caspase-3 that indicated cellular apoptosis. In the ultrastructural examination, spermatogenic cells degenerated with the frequent appearance of apoptotic cells. Sertoli cells showed vacuolations, large lipid droplets, and disrupted intercellular cell junctions. These observed testicular changes were markedly observed in the juvenile group. Testicular abnormalities and apoptotic changes can be caused by tramadol administration. These abnormalities are more common in juvenile mice.
Amal A. Gharamti,Nour Moukalled,Taher Ali,Kanafani Zeina A. 대한감염학회 2020 Infection and Chemotherapy Vol.52 No.3
A 30-year-old woman with a past medical history of autoimmune hemolytic anemia presented with fever. Blood cultures grew Campylobacter. Her medical history was significant for four prior episodes of Campylobacter gastroenteritis and bacteremia. She received ciprofloxacin for the index presentation, then Meropenem de-escalated to doxycycline 6 months later following recurrence of Campylobacter. This prompted investigation for an immunodeficiency disorder. She was found to have hypogammaglobulinemia. Her Campylobacter infections resolved following the administration of intravenous immunoglobulins every 3 weeks. She did not have recurrence of Campylobacter during 5 years of follow-up. A literature search revealed additional four case reports of six hypogammaglobulinemic adult individuals presenting with recurrent Campylobacter infections. Three patients were already on intravenous immunoglobulin (IVIG) when Campylobacter infection occurred, and two patients achieved clinical cure following therapy with imipenem and IVIG. This case report highlights the importance of suspecting hypogammaglobulinemia in patients with recurrent Campylobacter infections, as this is sometimes the first manifestation of the condition.
Amal Elawady,Haitham Aboshosha,Ashraf El Damatty 한국풍공학회 2018 Wind and Structures, An International Journal (WAS Vol.27 No.2
At the University of Western Ontario (UWO), numerical tools represented in semi-closed form solution for the conductors and finite element modeling of the lattice tower were developed and utilized significantly to assess the behavior of transmission lines under downburst wind fields. Although these tools were validated against other finite element analyses, it is essential to validate the findings of those tools using experimental data. This paper reports the first aeroelastic test for a multi-span transmission line under simulated downburst. The test has been conducted at the three-dimensional wind testing facility, the WindEEE dome, located at the UWO. The experiment considers various downburst locations with respect to the transmission line system. Responses obtained from the experiment are analyzed in the current study to identify the critical downburst locations causing maximum internal forces in the structure (i.e., potential failure modes), which are compared with the failure modes obtained from the numerical tools. In addition, a quantitative comparison between the measured critical responses obtained from the experiment with critical responses obtained from the numerical tools is also conducted. The study shows a very good agreement between the critical configurations of the downburst obtained from the experiment compared to those predicted previously by different numerical studies. In addition, the structural responses obtained from the experiment and those obtained from the numerical tools are in a good agreement where a maximum difference of 16% is found for the mean responses and 25% for the peak responses.
Squeeze flow and rheological characterization of pure bitumen and bitumen mixed with kaolin
Amal Kraiem,Abdelhak Ayadi,Nadia Elkissi 한국유변학회 2022 Korea-Australia rheology journal Vol.34 No.3
This study dealt with an experimental squeeze-fl ow test between two parallel disks and rheological measurements using a rotational rheometer of pure bitumen and bitumen mixed with 10 and 20 wt.% kaolin without slip condition. The experimental procedure of the homogeneous samples’ preparation was described. A steady-state and dynamic rheological analysis for pure bitumen and bitumen mixed with kaolin was detailed. Results show that pure bitumen and bitumen mixed with 10 wt.% kaolin at 26 °C correspond to a shear-thinning behavior. The effect of the kaolin particles becomes more critical at low shear rates than at high shear rates, where the matrix effect was dominant. The influence of temperature on bitumen mixed with 20 wt.% kaolin was investigated, and the obtained results show that the samples behave like a power-law model at 50 °C. Besides, the squeeze-fl ow test impact at an ambient temperature of 26 °C for pure bitumen and bitumen mixed with kaolin was also studied. Adding kaolin leads to a significant increase in viscosity and confirms the studied cases in the rheometry test at 26 °C. It was proven that pure bitumen and bitumen mixed with kaolin follow a power-law model at a specific range of shear rate. In particular, the decrease of the shear rate in bitumen mixed with 20 wt.% kaolin triggers the detection of the yield stress, which did not appear in the rheological measurements due to the applied deformation either in the shear and/or the elongational flow.