South Valley University
  • Luxor, Qena, Egypt
Recent publications
Background Rapid sequence induction is a well-established anesthetic procedure used in patients with a high risk of gastric aspiration. Suxamethonium has been the drug of choice; however, it carries potential risks and sometimes fatal outcomes. The aim of our study was to compare rocuronium after pretreatment with dexmedetomidine, to suxamethonium in providing excellent intubating conditions in rapid sequence induction in adults. Patients were randomly allocated to one of two groups, of 120 each. Control group (SS), patients received pretreatment with 10 ml 0.9% saline over 10 min and suxamethonium 1mg/kg. Experimental group (DR), received pretreatment with dexmedetomidine 1 μg/kg in 10 ml 0.9% saline over 10 min and rocuronium 0.6 mg/kg. Our primary endpoint was the number of patients who scored “excellent” on intubation conditions score, while secondary outcomes were hemodynamics and adverse events. Results The rate of excellent intubating conditions in the DR group 46% was insignificantly less ( P value = 0.548) than that of the SS group 49% (relative risk (RR) of DR compared to SS = 1.04, with a confidence interval (CI) of 0.91–1.48. The percentage of patients with adverse events in the SS group was (30%) nearly more than twofold higher than that of the DR group (11%). A significant difference ( P value = 0.016) in the incidence of excellent intubating conditions was higher in the female gender 59% compared to the male gender 38% (adjusted RR = 0.98, with a confidence interval of 0.79–1.1). Conclusion A combination of dexmedetomidine 1μg/kg and standard intubating dose of rocuronium 0.6 mg/kg provided comparable endotracheal intubation conditions to suxamethonium 1 mg/kg during RSI and might be used as an alternative to suxamethonium in situations where suxamethonium is contraindicated. Trial registration ClinicalTrials.gov Identifier: NCT04709315
Abstract Background We aim to assess the role of diaphragm ultrasonography in evaluating the outcome of surgical diaphragmatic plication in adults with symptomatic unilateral diaphragmatic eventration. Results Forty patients with symptomatic unilateral diaphragmatic eventration underwent surgical diaphragmatic plication between 2015 and 2020. The etiology was idiopathic in 34 (85%) cases, and 37 (92.5%) of them were suffering from dyspnea. Diaphragm ultrasonography showed no diaphragmatic movement on the affected side in 10 (25%) patients and a paradoxical movement in 30 (75%) patients. Surgical diaphragmatic plication was done successfully in all cases. Postoperative complications were reported in 3 (7.5%) cases, with no mortality. There was a highly significant improvement in dyspnea at 1 week and 6 months follow-up. CXR showed a highly significant decrease in the mean height of eventration at 1 week 3.7 ± 1.2 cm (P
Background In Egypt, studies of sarcocystosis in migratory and wading birds specially Podicipediformes are scarce. Therefore, the occurrence of Sarcocystis spp. in the little grebe, Tachybaptus ruficollis (Podicipediformes: Podicipdidae) was investigated in Qena province, Upper Egypt. During the period from September 2017 to March 2018, muscle specimens of esophagus from 25 little grebes were examined for the occurrence of Sarcocystis spp. using light microscopy, transmission electron microscopy (TEM) and molecular tools including conventional PCR and phylogenetic analysis with both 18S rRNA and 28S rRNA genetic loci. Results Sarcocystis spp. were identified in 84.0% (21/25) of the T. ruficollis esophageal muscle samples by morphological analysis; each was long, ribbonlike and extended along the muscle fibers. TEM revealed a characteristic thin and wavy cyst wall and an undulating vacuolar membrane with villar protrusions of slightly variant sulci and gyri, as well as several septated compartments filled with bradyzoites. The applied 18S rRNA and 28S rRNA were not enough variable for the identification of Sarcocystis species. Conclusion This study is the first to report the occurrence of Sarcocystis sp. in little grebes in Egypt. Further studies are required to identify Sarcocystis spp. in various wild birds by ITS1 region in Egypt. Graphical abstract
Background Emergence agitation is a potentially serious post-anesthetic event occurring in the early phase of recovery from general anesthesia, characterized by anxiety, disorientation, violent, and irrational behavior. Many agents have been used as prophylaxis with varying degrees of success. The purpose of this study was to compare the efficacy and safety of dexmedetomidine to magnesium sulfate in mitigating emergence agitation. Patients were randomly allocated to one of three groups of 35 each. Dexmedetomidine group (D group) received intraoperative Dex 0.7 μg/kg/h infusion (no loading dose). The magnesium sulfate group (M group) received intraoperative magnesium sulfate 20 mg/kg/h infusion (no loading dose). The control group (C group) received equal volume of saline infusion as placebo. Results The total incidence of emergence agitation was significantly lower in group D, 5.6% and group M, 8.5% compared to control group, 54.2%. The median time to extubation was significantly longer in group D than C and M groups (13, 7, and 8, respectively) and was not significantly different between group C and M. During recovery, the number of patients who experience pain was significantly lower in D and M groups compared to patients in control group ( P < 0.002). The total dose of rescue analgesic was also significantly lower in D and M group versus control group ( P < 0.001). Conclusions Dexmedetomidine and magnesium sulfate infusion are both equally effective in reducing the incidence of emergency agitation in obese adults undergoing nasal surgery. Extubation time and post-operative anesthesia care time were rather longer in dexmedetomidine than other groups. Trial registration Registered with ClinicalTrials.gov Identifier: NCT04531371
Background Gastrointestinal tract can be compressed by many vascular structures in the abdomen; such compressions may be incidentally found or may result in compression symptoms like abdominal pain and vomiting. Case presentation We illustrate an uncommon cause of extrinsic compression of the third part of the duodenum by jejunal branches of the superior mesenteric artery in an 18-year-old female, presented with dull-aching epigastric pain and vomiting. Contrast Enhanced Computerized Tomography (CECT) showed atypical origin of the jejunal branches of superior mesenteric artery with relative space narrowing between it and the aorta, causing significant compression on the third part of the duodenum. Barium follow-through confirmed indentation of the duodenal lumen at the same level of the aberrant vessel. Conservative treatment failed to control her symptoms, and the patient referred to the surgery. Conclusion High index of suspicion is required for diagnosis of atypical causes of upper abdominal pain and vomiting. CECT guided by a well-descriptive comment of the treating doctor is very helpful diagnostic tool for detecting such rare condition. Barium studies still have a valuable role for determining the level of obstruction and confirming the diagnosis of such rare cases.
Background Patients with liver cirrhosis commonly undergo diagnostic and/or therapeutic upper gastrointestinal endoscopy (UGIE). These fragile patients are at increased risk to develop complications as most sedative drugs are metabolized by the liver. This prospective, randomized controlled trial was performed to compare sedo-analgesia with ketamine-dexmedetomidine combination (KD 1 ) ( n = 35) versus dexmedetomidine alone (D 2 ) ( n = 35) in cirrhotic patients undergoing UGIE. Results UGIE could be performed effectively and safely with the KD 1 ( n = 35) group compared with the D 2 group as no significant change in hemodynamics (HR and MBP) and O 2 saturation (SPO 2 ) from baseline values ( P value > 0.05) while the D 2 group revealed a statistically significant drop in hemodynamic parameters when compared with the KD 1 group ( P value < 0.001). Also, the induction time was statistically significantly lower in the KD 1 group (3.9 ± 0.9 min) compared to the D 2 group (5.2 ± 1.1min) ( P value < 0.05). Recovery time was statistically significant faster in the KD 1 group (4.5 ± 1 min) versus the D 2 group (6.1 ± 1.6 min) with P value < 0.05. Endoscopic procedure was highly effective in KD 1 (100%) compared with D 2 (71.4%) with P value < 0.001. Supplementary fentanyl was given to 10 patients (28.6%) in the D 2 group versus 0% in the KD 1 group ( P value < 0.001). Regarding post-operative adverse effects, there was statistically significant discomfort in D 2 (28.6%) compared with KD 1 (5.7%) with P value = 0.02. Also, gagging was statistically significant in D 2 (22.9%) compared with KD 1 (2.9%) with P value = 0.03. Conclusions The ketamine-dexmedetomidine sedo-analgesia group is highly effective than the dexmedetomidine-alone group in UGIE procedures with rapid induction time, good hemodynamic stability good recovery profile with less post-operative adverse effects. Trial registeration 1. IRB approval: 5 December 2016(Chairperson of Institutional Review Board of Ethics committee of Qena University Hospitals Prof. Ahmed Abuelyosr). The committee reference number is not applicable. 2. This study is registered in the Australian Newzeland Clinical Trial Registry (ANZCTR) at the number 12615000367549. Trial Id: ACTRN12615000367549 , universal trial number(UTN): U1111-1165-6212.
Low-speed wind tunnel experiments are conducted to study the aerodynamic performance of a half-span delta wing with 45° leading-edge sweep at subsonic flow regime. The experiments are carried out at a Reynolds number of 8.37 × 10⁵, a free-stream Mach number of 0.1 and angles of attack up to 25°, in steps of 5°. The test model was designed with thirty-two pressure taps fixed on its surfaces (sixteen on each side). Multi-tube manometers were connected to these taps using long tubes to enable recording the pressure readings. Surface pressure distributions and aerodynamic characteristics were calculated at different span-wise locations along the non-dimensional chord-wise distance. Results exhibited that most lift on the studied wing is generated in the region close to the leading edge for all the studied incidence angles. Additional lift is created in the region close to the root chord rather than the tip chord, whereas drag forces increases from tip to root. This can be attributed to the formation of trailing edge vortexes due to the flow separation at the wing leading edge that produces more drag, hence suppressing lift. The study showed also that angle of attack increases the drag coefficient from tip to root, especially at high angle of attack, indicating unfavourable behaviour for manoeuvring. Moreover, the angle of attack increased the pitching moment coefficient up to 10° before it drops sharply until it reaches the tip of the wing model.
The incompressible smoothed particle hydrodynamics (ISPH) scheme is advanced to handle the conformable fractal differential equations of natural convection for a tall fin inside a cavity barred by nano encapsulated phase change material (NEPCM). The bottom circular cylinder is occupied by a porous medium plus a nanofluid, while the upper circular cylinder is filled by a nanofluid only. The conformable fractal operators generalize the classic idea of differentiability and allow for the generation of new and universal rates of variation. So, the study's novelty is revealing the validity of these operators in creating a new environment to look for more extended natural convection systems. The pertinent parameters are dimensionless time parameter τ(0-0.325), Rayleigh number Ra(103-106), Darcy parameter Da(10-2-10-5), cold source length LCold0.5-2.5, Stefan parameter Ste0.2-0.8, conformable fractal parameter α(0.93-1), and fusion temperature θf(0.05-0.95). The main outcomes showed the responsibility of α in speeding up the phase change process and the transition procedure of the convection flow. The nanofluid speed is reduced in the porous layer of a cavity, especially at the lower Darcy parameter. Different thermal conditions are altering the phase change material and strength of isotherms within a cavity.
By 2035, Egypt pursues to generate 22% of the total electricity from photovoltaic power plants to meet the national spreading demand for electricity. The Egyptian government has implemented feed-in tariffs (FiT) support program to provide the economic incentives to invest in the PV power plants. The present study is carried out to evaluate the techno-economic feasibility of a large-scale grid-connected photovoltaic (LS GCPV) of the Benban Solar Park with a total capacity of 1600 MW AC producing annual electricity of 3.8 TWh. The characteristics of PV panels considering the meteorological data of Benban Solar Park are evaluated. Additionally, the reduction of greenhouse gas (GHG) emissions due to constructing Benban Solar Park is assessed. As well, the influences of annual operation and maintenance cost and the interest rate on the electricity cost and the payback period are evaluated. The results indicate that the electricity cost is about 8.1 US¢/kWh with 10.1 years payback period, which is indeed economically feasible with an interest rate of 12%. Furthermore, the Benban Solar Park will avoid annually almost 1.2 million tons of greenhouse gas. Finally, based on the techno-economic analysis, the improvement directions for the feasibility analysis based on agrivoltaic systems are proposed.
Background Pregnancy of unknown location (PUL) is a term used to describe failure of visualization of intrauterine or extrauterine gestational sac in a woman with a positive pregnancy test. Body of the abstract Ectopic pregnancy (EP) accounts for 1–2 % of all pregnancies. EP contributes to maternal mortality of a known cause by 4% in developed countries. However, case fatality rate may be 10 times higher in low-resource countries. This may be attributed to delayed diagnosis and lack of resources. PUL is a temporary term that may eventually lead to diagnosis of viable intrauterine pregnancy, pregnancy loss, or more seriously, EP. Conclusion This guideline appraises current evidence on assessment of PUL and early diagnosis of EP particularly in low-resource settings.
A laser ablation in liquid approach was used to generate nickel oxide nanoparticles (NiO NPs) dispersed in liquid media from a PVA solution to be applicable for the removal of phosphate from an aqueous solution. With a nanosecond Nd:YAG pulsed laser operating at 1064 nm, NiO NPs were produced and embedded in a matrix structure of PVA. Different approaches were used to investigate their structure, optical properties, and morphology. It was discovered that the NiO NPs were equally spread and fixed in the PVA cross-linked network structure. The main characteristic vibrational peaks of the PVA structure are developed in their intensity or locations. The new absorption peak appeared at around 270 nm due to the electronic transition from the inner levels of NiO to the fermi level of the empty conduction band based on doping the PVA structure with NiO NPs. After that, the effects of adsorption time, reaction temperature, pH, initial concentration of phosphate, and loading rate were investigated to get the optimum condition for the adsorption process to remove phosphate from an aqueous solution. It is concluded that PVA-NiO nanocomposite, prepared with 30 min of laser ablation, appears to be a promising adsorbent for removing phosphate at a 150 mg/L concentration from aqueous solution at pH 4.
Background Nephritis is known to be one of the most serious complications of lupus and a strong predictor of poor outcome. This study was carried out aiming at setting up an up-to-date recommendation for the management of women living with lupus nephritis and planning for a family throughout conception, pregnancy, and the postpartum period. Ten key clinical questions were identified by the scientific committee according to the Patient/Population, Intervention, Comparison, Outcomes and Timing (PICOT) approach. The literature review team performed a systematic review to summarise evidence advocating the benefits and harms of available pharmacologic and nonpharmacologic therapies for women living with lupus nephritis (LN) and planning for a family. Subsequently, recommendations were formulated. The level of evidence was determined for each section using the Oxford Centre for Evidence-Based Medicine (CEBM) system. A 2-round Delphi process was conducted with 24 experts. All rounds were conducted online. A consensus was achieved on the direction and the strength of the recommendations. Results An online questionnaire was sent to an expert panel who participated in the two rounds (response rate 100%). At the end of round 2, a total of 20 recommendation items, categorised into 10 domains to address the main LN with pregnancy categories, were obtained. The percentage of those who agreed with the recommendations (rank 7–9) ranged from 88.5 to 100%. On the phrasing of all the clinical standards defined by the scientific committee, a consensus was reached (i.e., 75% of respondents strongly agreed or agreed). An algorithm for the management of LN with pregnancy has been suggested. Conclusion These recommendations provide an updated consensus on the pharmacological treatment of LN with pregnancy and strategies to reach optimal outcomes for both the mother and newborn in common clinical scenarios, based on a combination of evidence and expert opinion. Best treatment decisions should be tailored to each individual patient’s situation.
Recently, the rapid expansion of photovoltaic (PV) sources in the distribution system (DS) has caused severe voltage problems. The voltage condition of PV varies depending on the connection point at the DS, which causes an unfair situation that the output powers are curtailed for some specific PVs. This research proposes two novel methods for managing the PV sources’ powers to achieve the optimal and effective operation of the DS. The objective is to maximize the total generated PV powers while regulating the DS voltages and decreasing the unfair situation based on the dynamic nodal pricing for active and reactive powers. The first proposed method provides the optimality in the DS, while frequent communications are necessary. In the second method, the prosumers directly utilize the target nodal voltages for real-time controls, which can prevent the degradation of the control performance despite the decrease in the communication frequency. Furthermore, a multi-agent control approach is used to realize an effective control structure. The Simulated case studies show that the proposed methods can realize optimal DS operation successfully and deal with the voltage violations, minimizing the curtailment of PV power and providing a solution to the unfairness problem.
A nanosecond solid state Nd:YAG laser was employed to develop nanocomposites from multi-walled carbon nanotubes (MWCNTs) coated with ZnO nanoparticles in a single step to improve their optoelectronic capabilities. The physicochemical features of the produced samples were investigated using various spectroscopic methods. The produced results showed that the MWCNTs image has a smooth tubular surface associated with spherical material of ZnO that is uniformly connected to the surface nanomaterials. There were no extra particles discovered surrounding MWCNTs, and the elemental analysis study consisted of just Zn, C, and O. Moreover, the diffraction patterns showed the main characteristic peaks of the graphite structure and the ZnO structure. Besides, the transition motion of the prepared ZnO was red-shifted compared to that of bulk ZnO. Also, the intensity ratios (ID/IG) were developed to higher values than pristine MWCNTs. After that, the Z-scan approach was used to evaluate the nonlinear characteristics of the produced nanocomposite at the different irradiation laser intensities. It was shown that as the incident laser intensities increase, the values of nonlinearity parameters increase, and metal oxide nanoparticles improve the nonlinearity of MWCNTs significantly because metal oxide nanoparticles increase the time of electron transfer and photon transition, resulting in recombination for both electrons and holes, and extend the free carrier's working time, improving the nonlinear optical properties of nanocomposites. These results show a simple way to make a smart nanocomposite with great nonlinearity properties. These nanocomposites could be used in optical devices like optical switches and optical sensors.
In this paper, the optimization and multiple-criteria decision analysis (MCDA) of a stand-alone photovoltaic and battery energy system (PV-BES) has been used to supply power to a desalination plant in the United Arab Emirates (UAE). To provide a continuous power supply, different types of battery technologies have been used as a renewable energy storage system in this study as Nickel Iron (NiFe), Lithium Iron Phosphate (LiFePO4), and Lead Acid (PbSO4) with three different depths of discharges. Six different configurations of the PV-BES were modeled. In total, nine metaheuristic optimization algorithms were used in the MATLAB environment to provide an optimal sizing of the PV-BES. The mayfly optimization algorithm has provided the best optimal Annual Levelized Cost (ALC) values compared with the remaining algorithms. The mayfly algorithm has more robustness and faster convergence in providing the optimal global best values. Furthermore, three different approaches of MCDA and weights methods were used. The inputs and the results for the optimization process in addition to the sustainable development goal (SDGs) from the united nation (UN) were used as criteria for MCDA. The PV-Li-ION at 50 % depth of discharge (DOD) was the best option among all cases based on the six configurations and nine optimization algorithms.
In Egypt, the seed and pollen grain morphology of the genus Tephrosia Pers. were studied using light and scanning electron microscopy. Qualitative and quantitative characters of seeds and pollen grains are presented. The data suggest that several seed and pollen morphological characters can distinguish the taxa of Tephrosia. Based on UPGMA clustering analysis and PCA, three main clades were recognized: Clade A comprising T. kassasii, clade B comprising T. apollinea, T. purpurea, T. quartiniana, and T. uniflora, and clade C comprising T. nubica. The seed and pollen morphological data obtained in this study provide additional characters helping in classifying the genus. Dichotomous artificial keys based on seed and pollen data of the investigated taxa are presented.
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2,172 members
Yasser Mustafa
  • Department of Physics
Youssuf Gherbawy
  • Department of Botany
Karima Galal Abdel hameed
  • Department of Food Hygiene
Abdel-Nasser A. Hussein
  • Department of Zoology
Yasser Abdel Galil Ahmed
  • Faculty of Veterinary Medicine
Information
Address
South Valley University, 83523, Luxor, Qena, Egypt
Head of institution
Prof. Dr. Youssuf Gherbawy
Website
http://www.svu.edu.eg/
Phone
+20 96 3211281
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+20 96 3211279