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Rare Metals 2024年第8期43卷 3758-3770页

作者： Jiang-Yu-Shan Liang Hai-Tao Ren Abdelkader Labidi Qiu-Hui Zhu Qi-Bing Dong ahmed a.allam ahmed Rady Chuan-Yi Wang School of Environmental Science and Engineering Shaanxi University of Science and TechnologyXi'an 710021China Zoology Department Faculty of ScienceBeni-Suef UniversityBeni-Suef 6251lEgypt Department of Zoology College of ScienceKing Saud University11451 RiyadhSaudi Arabia

In practical applications,relative humidity in the air is a key factor affecting the photocatalytic removal of NO,which is often overlooked in previous ***,we developed a direct Z-scheme UiO-66-NH_(2)/Bi_(2)MoO_(6)heterojunction with a nanoflower-like structure to systematically investigate the effect of relative humidity on photocatalytic removal of *** optimized heterojunction for the removal efficiency of NO was 71.6%at1.07 mg·m^(-3)NO concentration(relative humidity=10%),and the generation of NO_(2) was only 1.1%.Interestingly,with the increase in relative humidity,it showed a higher inhibition effect on NO_(2),while the removal of NO decreased slightly(8%),which might be attributed to the affinity effect of NO_(2) with water molecules and the competitive adsorption of H_(2)O and NO on the surface of the heterojunction ***,the reaction pathways of NO removal at the developed heterojunctions were revealed by in situ DRIFTS *** work provides a novel vision for the development of direct Z-scheme heterojunction photocatalysts to effectively remove NO and inhibit the formation of toxic intermediate NO_(2) under different humidities.

关键词： NO removal Relative humidity Direct Z-scheme Bismuth molybdate Visible-light photocatalysis

Rudists(Bivalvia) from a Cretaceous Platform in Northern Egypt: Taxonomy and Paleobiogeography

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Acta Geologica Sinica(English Edition) 2021年第6期95卷 1967-1983页

作者： Yasser SALAMA Jamaan S.AJAREM ahmed a.allam ahmed M.ALMALKI Geology Department Faculty of ScienceBeni-suef UniversityBeni-suef 65211Egypt Department of Zoology College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia Department of Zoology Faculty of ScienceBeni-suef UniversityBeni-suef 65211Egypt

New well-preserved rudist materials come from the Barremian–Turonian marine formations in the Yelleg, Minsherah, Maaza, and Raghawi sections in North Sinai, northern Egypt. There, 17 discovered rudist species belonging to 13 genera and seven taxonomic families are described in detail as follows: Eoradiolites plicatus(Conrad), Eoradiolites liratus(Conrad), Praeradiolites ponsianus(d'Archiac), Archaeoradiolites sp., Bournonia africana Douvillé, Bournonia fourtaui Douville, Biradiolites lombricalis(d'Orbigny), Biradiolites zumoffeni Douville, Radiolites lewyi lewyi Parnes, Radiolites sauvagesi(d'Hombres-Firmas), Durania arnaudi(Choffat), Toucasia carinata(Matheron), Toucasia sp., Neocaprina raghawiensis Steuber and Bachmann, Sellaea sp., Ichthyosarcolites sp. and Horoiopleura sp.. The Cenomanian deposits in the northern Eastern desert of Egypt only contain E. liratus. The domination of the Cenomanian rudist species in North Sinai, however, is attributed to changes in the platform, which passes mainly from carbonate in the north to siliciclastics in the south. The presence of Horiopleura sp. in the late Barremian-early Aptian deposits is documented for the first time, which suggests the expansion of taxa of the genus Horiopleura Douville to North Sinai during this interval. The age of the rudist species is documented from the late Barremian-Turonian formations, with their geographic distribution in the Mediterranean region considered..

关键词： invertebrate paleontology mollusks rudists Taxonomy Paleobiogeography Barremian–Turonian Egypt

Green process of biomass waste derived fluorescent carbon quantum dots for biological imaging in vitro and in vivo

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Chinese Chemical Letters 2023年第6期34卷 282-286页

作者： Haitao Ren Yue Yuan Abdelkader Labidi Qibing Dong Ke Zhang Eric Lichtfouse ahmed a.allam Jamaan S.Ajarem Chuanyi Wang School of Environmental Science and Engineering Shaanxi University of Science and TechnologyXi’an 710021China School of Basic Medical Sciences Center for Tissue Engineering and Stem Cell ResearchGuizhou Province Key Laboratory of Regenerative MedicineGuizhou Medical UniversityGuiyang 550004China Aix-Marseille Univ CNRSIRDINRAECEREGEAix en Provence 13100France Zoology Department Faculty of ScienceBeni-Suef UniversityBeni Suef 65211Egypt Zoology Department College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia

In the context of the circular economy,the huge amounts of biomass waste should be converted into value-added materials and energy to diminish pollution,atmospheric CO_(2)levels and costly waste *** imaging usually uses expensive and toxic chemicals e.g.,organic dyes,semiconductor quantum dots,calling for safer,greener,cheaper fluorescent probes for biological imaging in vitro and in *** these regards,carbon quantum dots(CQDs)-based fluorescent probes using biomass waste as a precursor may have much higher *** we transformed the biomass waste of peach leaves into value-added fluorescent CQDs through a low-cost and green one-step hydrothermal *** obtained CQDs show excitation-dependent photoluminescence properties with a fluorescence lifetime of 5.96 ns and a quantum yield of 7.71%without any *** addition,the CQDs have a fine size of 1.9 nm with good hydrophilicity and high fluorescent stability over pH 4.0-11.0 *** imaging of in vitro cell cultures and in vivo with zebrafish show that CQDs possess ultra-low toxicity and remarkable performance for biological *** when CQDs present at a concentration as high as500μg/m L,the organism can still maintain more than 90%activity both in vitro and in vivo,and present bright *** cheaper,greener,ultra-low toxicity CQDs developed in this work is a potential candidate for biological imaging in vitro and in vivo.

关键词： Carbon quantum dots Biomass waste Biological imaging Bioresource conversion Green extraction

Transient elastography and diffusion-weighted magnetic resonance imaging for assessment of liver fibrosis in children with chronic hepatitis C

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World Journal of Virology 2024年第3期13卷 89-97页

作者： Mohamed A El-Guindi Alif a.allam ahmed A Abdel-Razek Gihan A Sobhy Menan E Salem Mohamed A Abd-Allah Mostafa M Sira Pediatric Hepatology Gastroenterology and NutritionNational Liver InstituteMenoufia UniversityShebin El-Koom 32511MenoufiaEgypt Department of Diagnostic Radiology Mansoura Faculty MedicineMansoura 13551Egypt

BACKGROUND Chronic hepatitis C(CHC)is a health burden with consequent morbidity and *** biopsy is the gold standard for evaluating fibrosis and assessing disease severity and prognostic purposes *** altern-atives for liver biopsy such as transient elastography(TE)and diffusion-weighted magnetic resonance imaging(DW-MRI)are critical *** To evaluate TE and DW-MRI as noninvasive tools for predicting liver fibrosis in children with *** This prospective cross-sectional study initially recruited 100 children with CHC virus ***-four children completed the full set of investigations including liver stiffness measurement(LSM)using TE and measurement of apparent diffusion coefficient(ADC)of the liver and spleen using *** biopsies were evaluated for fibrosis using Ishak scoring *** and liver and spleen ADC were compared in different fibrosis stages and correlation analysis was performed with histopathological findings and other laboratory *** Most patients had moderate fibrosis(73.5%)while 26.5%had mild *** had severe fibrosis or *** majority(68.8%)had mild activity,while only 7.8%had moderate *** scores had a significant direct correlation with LSM(P=0.008)and were negatively correlated with both liver and spleen ADC but with no statistical significance(P=0.086 and P=0.145,respectively).Similarly,histopatho-logical activity correlated significantly with LSM(P=0.002)but not with liver or spleen ADC(P=0.84 and 0.98 respectively).LSM and liver ADC were able to significantly discriminate F3 from lower fibrosis stages(area under the curve=0.700 and 0.747,respectively)with a better performance of liver *** TE and liver ADC were helpful in predicting significant fibrosis in children with chronic hepatitis C virus infection with a better performance of liver ADC.

关键词： Apparent diffusion coefficient Chronic hepatitis C Diffusion-weighted magnetic resonance imaging Liver fibrosis Liver stiffness Transient elastography

Efficacy of using NRT thresholds in cochlear implants fitting,in prelingual pediatric patients

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Journal of Otology 2019年第4期14卷 128-135页

作者： ahmed allam ahmed Eldegwi Department of Otolaryngology Mansoura University

Objective:To evaluate the efficacy of using neural response telemetry(NRT)thresholds in predicting behavioural thresholds during programming of cochlear implant in prelingual ***:Prospective study of 28 cochlear implants implanted with Nucleus 24 cochlear *** recorded NRT-thresholds on electrode numbers 1,6,11,16 and 22 of the electrode array in each patient,the neural response thresholds were correlated with the behavioural map after six months of programming the ***:The mean neural response telemetry level was significantly higher than the mean threshold level(T-level)but lower than the comfortable level(C-level)in all the electrodes *** levels could statistically significantly predict T behavioural levels and comfortable behavioural levels,p<*** was a strong positive correlation between comfortable thresholds and neural response telemetry level measurements and behavioural threshold level and neural response telemetry threshold ***:There is a useful role for neural response telemetry values in predicting the behavioural threshold and comfortable values in prelingual *** the NRT values with behavioural observations can improve the programming of cochlear implants.

关键词： NRT ECAP Behavioural levels Cochlear implant Programming

Magnetic field induction and magnetic force distribution profiles in plasma focus discharge device

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Plasma Science and Technology 2021年第7期23卷 110-120页

作者： A A LASHIN T M allam H A EL-SAYED Kamal M ahmed S A WARD H M SOLIMANand M A ABOUELATTA Plasma and Nuclear Fusion Department Nuclear Research CentreEgyptian Atomic Energy AuthorityInshas 13759Egypt Faculty of Engineering Delta University for Science and TechnologyGamasa 11152Egypt Electrical Engineering Department Faculty of Engineering at ShoubraBenha UniversityCairo 11629Egypt

We report a simple-to-perform technique to investigate the distribution of the azimuthal magnetic field induction,Bθ,and the induced magnetic force acting on the plasma current sheath(PCS)in a plasma focus(PF)*** in situ measurement technique can undoubtedly be beneficial when other fast-imaging techniques are not *** are not *** work was conducted in the low-energy Mather-type EAEA-PF1 device operated in *** axial distribution(Bθ)z along the coaxial electrodes system was measured with a four magnetic-probe set technique at different radial distances(r=2.625×10^(−2) to 4.125×10^(−2) m)within the annular space between the coaxial electrodes during the 1st and 2nd half cycles of the discharge current waveform,where inner electrode of coaxial electrode system has a+ve polarity and−ve polarity,***,radial and total magnetic force distribution profiles were estimated from Bθ*** of PCS shape in terms of its inclination(curvature)angle,θ,along the axial rundown phase and the correlation between the magnetic forces per unit volume acting on the PCS,the inclination angleθof the PCS,and the formation of a powerful PF action during the 1st and 2nd half cycles is carried *** of inclination angle,θ,on total magnetic force per unit volume acting on PCS axial motion was studied,separately,during the 1st and 2nd half cycles.

关键词： plasma focus azimuthal magnetic field magnetic force inclination angle plasma current sheath

Association between <i>Helicobacter pylori</i>Infection and Iron Deficiency Anemia among School-Age Children in Sohag University Hospital, Upper Egypt

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Open Journal of Blood Diseases 2017年第1期7卷 36-46页

作者： Ashraf Abou-Taleb ahmed allam Mahmoud Kamal Elsamman Department of Pediatrics Faculty of Medicine Sohag University Sohag Egypt Department of Clinical Pathology Faculty of Medicine Sohag University Sohag Egypt Gastroenterology Division Department of Internal Medicine Faculty of Medicine Sohag University Sohag Egypt

Background: Helicobacter pylori (H. pylori) infection has been suggested as a cause of iron deficiency anemia (IDA) refractory to iron therapy. Objective: The aim of this work was to evaluate the association between H. pylori infection and IDA among school-age children. Subjects and Methods: This was a prospective case-control study conducted for one year starting from March 2015 and included 200 school-age children with IDA and 50 age and sex matched non-anemic controls, attending pediatric outpatient clinic at Sohag university Hospital, Sohag, Upper Egypt. All of participants were subjected to clinical evaluation and the following investigations: CBC, serum iron, total iron binding capacity, serum ferritin and a quantitative detection of H. pylori IgG antibodies. Results: Totally, 72 (36%) children with IDA and 6 (12%) non-anemic controls had positive level for H. pylori specific IgG (P = 0.036). H. pylori IgG antibody titer showed significant positive correlation with age and significant negative correlation with each of Hb level, MCV, HCT and serum ferritin. Age was higher (p H. pylori positive IDA cases in comparison to H. pylori negative IDA cases. Conclusion: The results of this study demonstrate significant association between positive serology for H. pylori infection and IDA in school-age children. Moreover, infection may increase the severity of anemia.

关键词： H. pylori Iron Deficiency Anemia School-Age Children

Validation of prognostic indices in Egyptian Budd-Chiari syndrome patients: A single-center study

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World Journal of Gastroenterology 2017年第4期23卷 629-637页

作者： Mohammad Sakr Sara M Abdelhakam Soheir A Elsayed Enas H allam Amir M Farid Waleed Abdelmoaty Azza M Hassan Mohamed Shaker Mohamed El-Gharib ahmed Eldorry Department of Tropical Medicine Faculty of MedicineAin Shams University Department of Community Environmental and Occupational MedicineFaculty of MedicineAin Shams University Department of Radiodiagnosis and Interventional Radiology Faculty of MedicineAin Shams University

AIMTo compare predictive ability of Budd-Chiari syndrome (BCS) prognostic indices (PIs) for one-year survival and Transjugular intrahepatic portosystemic shunt (TIPS) *** retrospective study enrolled 194 Egyptian patients with primary BCS who presented to the Budd-Chiari Study Group of Ain Shams University Hospital. Calculation of the available PIs was performed using Child-Pugh and model for end-stage liver disease scores, BCS-specific PIs (Clichy, New Clichy and Rotterdam) for all patients, and BCS-TIPS PI only for patients who underwent TIPS. The overall one-year survival rate and the one-year shunt patency rate for TIPS were *** overall one-year survival rate was 69.6%, and the New Clichy PI revealed the best validity for its prediction at a cut-off value of 3.75, with sensitivity and specificity of 78% and 73.3%, respectively [area under receiver operating characteristic curve (AUC) = 0.806]. The one-year survival rate post-TIPS was 89.7%, and the BCS-TIPS score demonstrated validity for its prediction at a cut-off value of 3.92 (sensitivity and specificity were 71.4% and 64.5%, respectively) (AUC = 0.715). Logistic regression analysis revealed that the New Clichy PI (P = 0.030), high serum total bilirubin (P = 0.047) and low albumin (P < 0.001) were independent factors for predicting mortality within one year. The one-year shunt patency rate in TIPS was 80.2%, and none of the PIs exhibited significant validity for its *** New Clichy score could independently predict the one-year survival in Egyptian BCS patients.

关键词： Budd-Chiari syndrome Prognostic indices New Clichy score One-year survival Transjugular intrahepatic portosystemic shunt

Prognostic Features of BCR-ABL Genetic Variations in Acute Lymphoblastic Leukemia

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Open Journal of Blood Diseases 2018年第4期8卷 90-100页

作者： Dina Adel Fouad Hasnaa A. Abo_Elwafa Shereen Philip Aziz ahmed A. allam Nesma Mokhtar Clinical Pathology Department Faculty of Medicine Ain Shams University Cairo Egypt Clinical Pathology Department Faculty of Medicine Sohag University Sohag Egypt

Background: Acute lymphoblastic leukemia (ALL) is a hematologic malignancy which results from accumulation of lymphoid progenitor cells in the bone marrow and/or extramedullary sites. Philadelphia chromosome (Ph1) positive ALL, a high-risk cytogenetic subset, accounts for 25% - 30% of adult ALL cases but occurs in less than 5% of children. We aimed with this study to detect BCR-ABL genes fusion, amplification and deletion in ALL patients, using extrasignal-fluorescence in situ hybridization (ES-FISH), and to assess their relation with other standard prognostic factors and therapeutic response. Patients and Methods: This study was carried out on 39 newly diagnosed ALL patients. All patients were subjected to: history, clinical examination and laboratory investigations, which included complete blood count (CBC), peripheral blood (PB), bone marrow (BM) examination, immunophenotyping and fluorescence in situ hybridization using extra-signal probe to detect BCR-ABL genes fusion. Results: This study showed statistical analysis of patients’ t(9;22) with other factors revealed, significant association (p 35 years, hepatosplenomegaly, absence of lymphadenopathy, TLC ≥ 50 × 109/L, absolute PB blasts ≥ 4.4 × 109/L, immunophenotyping and other aberrations. Conclusion: BCR/ABL fusion gene analysis by ES-FISH may serve as a prognostic marker in adulthood ALL. The age, TLC and t(9;22) represent the significant standard prognostic factors in relation to patients’ outcome.

关键词： Acute Lymphoblastic Leukemia Philadelphia Chromosome-Positive Extrasignal-Fluorescence In Situ Hybridization

Clinico-Epidemiological Characteristics and Survival Outcomes of COVID-19 Infection in Kassala, Eastern Sudan

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Advances in Infectious Diseases 2023年第1期13卷 96-108页

作者： Abdualmoniem O. Musa Mushal allam Elhadi A. ahmed Nouh S. Mohamed Mohamed H. ahmed Abubakr Omer Tajeldin M. Abdallah Nadir Abuzeid Department of Microbiology Faculty of Medical Laboratory Sciences University of Kassala Kassala Sudan Department of Microbiology Faculty of Medical Laboratory Sciences University of Gezira Wad Madani Sudan General Administration of Medical Laboratories Ministry of Health Kassala Sudan Department of Genetics and Genomics College of Medicine and Health Sciences United Arab Emirates University Al Ain United Arab Emirates Department of Molecular Biology Faculty of Medical Laboratory Sciences Nile University Khartoum Sudan Department of Medicine and HIV Metabolic Clinic Milton Keynes University Hospital NHS Foundation Trust Milton Keynes UK School of Medical Sciences Örebro University Örebro Sweden Faculty of Medicine University of Khartoum Khartoum Sudan Department of Internal Medicine Faculty of Medicine University of Kassala Kassala Sudan Department of Microbiology Faculty of Medical Laboratory Sciences Omdurman Islamic University Omdurman Sudan

Introduction: Severe acute respiratory syndrome coronavirus2 (SARS-CoV-2) represents a major health problem worldwide. Thus, early detection and appropriate management of the virus will influence the outcome of the disease. This study aimed to investigate the epidemiological characteristics and survival outcomes of patients with COVID-19 infection in Kassala, Eastern Sudan. Methods: A cross-sectional hospital-study was conducted among patients visiting Kassala teaching hospital with suspicion of COVID-19 infection. A structured questionnaire was used to gather clinical and socio-demo- graphic information from COVID-19 patients. Nasopharyngeal specimens and blood samples were collected and tested to confirm the diagnosis of COVID-19 infection using RT-PCR. Results: A total of 371 patients were enrolled in the study from September 2020 to January 2021, with mean age ± SD was 42.9 ± 19.9. The prevalence of COVID-19 infection was estimated at 61.7%. The majority were males 159 (69.4%), of university-level education, 96 (49.7%), and urban residents, 175 (9.7%). The most common symptoms were fever 215 (93.9%), cough 188 (82.1%), headache 179 (78.2%), and shortness of breath 154 (67.2%). Overall all mortality was reported as 16%. Older age group with the age ≥ 70, P P = 0.020, diabetes mellitus P = 0.029 were significantly associated with high case fatality. Conclusion: This study demonstrated that older age, male gender, laboratory tests (leukocytosis, lymphopenia, low Hemoglobin and high CRP) and various comorbid conditions significantly increase the disease severity and mortality. Therefore, attention should be paid to preventive measures to reduce the considerable impacts of the disease.

关键词： COVID-19 Infection Epidemiology Outcome Sudan