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Synthesis of New Biologically Active Sulphur Containing Compounds Incorporating Diphenyl Ether Moiety

材料科学与工程（中英文B版） 2011年第4期1卷 461-471页

作者： Kalil Ali H.A. Eyada mohamed T. Abd EI-Rahman mohamed hamdy Helal mohamed Sayed Abd-Elal.El-Gaby Gameel Ahmed mohamed El-Hag Ali Chemistry Department Faculty of Science Ain Shams University Cairo Egypt Chemistry Department Faculty of Science Al-Azhar University Nasr City Cairo Egypt Chemistry Department Faculty of Science Al-Azhar University Assuit Assuit Egypt

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Could Ambulatory Blood Pressure Monitoring Be a Routine Investigation for Patients with Mild Cognitive Impairment?

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Neuroscience & Medicine 2015年第2期6卷 50-57页

作者： mohamed hamdy Ibrahim Tamer Taha Ismail Taha Laila Adel Mohsen Nisrin Moustafa Rizk El-Elsaadouni Neurology Department Faculty of Medicine Ain Shams University Cairo Egypt Cardiology Department Faculty of Medicine Minia University Minya Egypt Radiology Department Faculty of Medicine Minia University Minya Egypt Psychiatry Department Faculty of Medicine Al-Mansoura University Mansoura Egypt

Objectives: To study the ambulatory measured blood pressure (ABPM) profile in normotensive patients with mild cognitive impairment (MCI). Patients and Methods: The study was designed as a case control study including 50male patients with mild cognitive impairment in the age group of 30 - 50 years old. The control group included 30 volunteers with no cognitive impairment and in the same age group (30 - 50 years old) and same gender. Mini-mental estate examination, office and ABP monitoring (ABPM) and brain MRI scans were done for cases and controls. Results: Thirty patients (60%) with MCI revealed a non-dipper blood pressure pattern. Sleeping systolic blood pressure and sleeping systolic load were significantly higher in patients with MCI than in normal volunteers (p = 0.01). MRI brain showed more white matter lesions (WMLs) in patients with MCI than in normal volunteers;however, this didn’t reach significance level (p = 0.056). Conclusion: MCI in normotensive young adult patients could reflect an abnormal circadian blood pressure rhythm. Ambulatory blood pressure monitoring could be an essential investigation in young adult MCI patients.

关键词： Mild Cognitive Impairment Ambulatory Blood Pressure Monitoring White Matter Lesions Non-Dipper MMSE

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CoSe_(2)nanowire array enabled highly efficient electrocatalytic reduction of nitrate for ammonia synthesis

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Chinese Chemical Letters 2024年第11期35卷 481-485页

作者： Ting Xie Xun He Lang He Kai Dong Yongchao Yao Zhengwei Cai Xuwei Liu Xiaoya Fan Tengyue Li Dongdong Zheng Shengjun Sun Luming Li Wei Chu Asmaa Farouk mohamed S.hamdy Chenggang Xu Qingquan Kong Xuping Sun College of Chemistry and Materials Science Sichuan Normal UniversityChengdu 610068China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China College of Chemistry Chemical Engineering and Materials ScienceShandong Normal UniversityJi'nan 250014China Institute for Advanced Study Chengdu UniversityChengdu 610106China Department of Chemistry College of ScienceKing Khalid UniversityP.O.Box 900461413 AbhaSaudi Arabia

The electrocatalytic reduction of nitrate(NO_(3)^(-))not only facilitates the environmentally sustainable production of ammonia(NH_(3))but also purifies water by removing NO_(3)^(-),thereby transforming waste into valuable *** process of converting NO_(3)^(-)to NH_(3)is complex,involving eight electron transfers and multiple intermediates,making the choice of electrocatalyst *** this study,we report a cobalt selenide(Co Se_(2))nanowire array on carbon cloth(CoSe_(2)/CC)as an effective electrocatalyst for the NO_(3)^(-)to NH_(3)*** an alkaline medium with 0.1 mol/L NO_(3)^(-),CoSe_(2)/CC demonstrates exceptional NH_(3)Faradaic efficiency of 97.6%and a high NH_(3)yield of 517.7μmol h^(-1)cm^(-2)at-0.6 V versus the reversible hydrogen ***,insights into the reaction mechanism of CoSe_(2)in the electrocatalytic NO_(3)^(-)reduction are elucidated through density functional theory calculations.

关键词： CoSe_(2) Electrocatalytic nitrate reduction NH_(3)synthesis Electrocatalysis Density functional theory calculation

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Could Dystonia Be Initial Presentation of Corpus Callosum Infarction in Young Age Patients? A Case Report Study

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Neuroscience & Medicine 2015年第2期6卷 62-64页

作者： mohamed hamdy Ibrahim Alyaa Fadhil Sameh Saied Ali Salma Fathy Abdel Kader mohamed Khalid Kiran Kumar Shivram Kumar Janhavi Sirsat Department of Neurology GMCH & RC Ajman United Arab Emirates Department of Clinical Pharmacology GMCH & RC Ajman United Arab Emirates Department of Radiology GMCH & RC Ajman United Arab Emirates Department of Internal Medicine GMCH & RC Ajman United Arab Emirates Gulf Medical University (GMU) Ajman United Arab Emirates

Focal dystonia in young aged patients is considered to be the uncommon clinical presentation, unless a secondary cause is to be considered. Infarcts of the corpus callosum are rare and have not been well documented previously. As for a variety of signs and symptoms due to corpus callosum lesion, focal dystonia can be easily overlooked. The case is approved by ethical committee and explained to the patient with patient approval.

关键词： Focal Dystonia Corpus Callosum Infarction Involuntary Movement

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Case Report on Hiccup and Lateral Medullary Syndrome

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Neuroscience & Medicine 2015年第2期6卷 58-61页

作者： mohamed hamdy Ibrahim Alyaa Fadhil Sameh Saied Ali Salma Fathy Abdel Kader mohamed Khalid Kiran Kumar Shivram Kumar Janhavi Sirsat Department of Neurology GMCH & RC Ajman United Arab Emirates Department of Clinical Pharmacology GMCH & RC Ajman United Arab Emirates Department of Radiology GMCH & RC Ajman United Arab Emirates Department of Internal medicine GMCH & RC Ajman United Arab Emirates Gulf Medical University (GMU) Ajman United Arab Emirates

The case study is aimed at providing a more thorough analysis of a case of lateral medullary syn-drome presented only with persistent hiccup after eating lunch the study hopes to generate an interest for further studies into the topic and focuses on abnormal unusual presentations of lateral medullary syndrome. Ethical committee has approved this case after taking consent from the patient and explaining to him the importance of the case in clinical practice.

关键词： Hiccup Lateral Medullary Syndrome Stroke

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Volumetric Assessment of Corticospinal Tract Infiltration by Astrocytoma Using Diffusion Tensor Tractography

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Open Journal of Medical Imaging 2014年第2期4卷 65-71页

作者： Marwa Adel Shaaban Taha Kamel Alloush mohamed hamdy Ibrahim Ahmed Abd el bar Sherif Hashim Morad Department of Neurology Ain Shams University Cairo Egypt Department of Neurosurgery Ain Shams University Cairo Egypt Department of Radiology Misr University for Science and Technology Cairo Egypt

Objectives: The aim of the study is to assess volumetric Corticospinal Tract infiltration by Astro-cytoma using Diffusion Tensor Tractography. Material and Methods: Preoperative, anatomic (T1- and T2-weighted) and diffusion tensor MRI were performed in 9 patients with supratentorial gliomas (WHO grade II and III). The tumors were manually segmented from the T1- and T2-weighted MRI, and their volume calculated. A three-dimensional tractography was performed in each case. A second segmentation and volume measurement was performed on the tumor regions intersecting adjacent white matter fiber tracts. Results: We identified that white matter tracts were infiltrated by 6 Astrocytoma tumors. The median tumor volume (±standard deviation) in our patient population was 33 ± 26.82 ml. The median tumor volume (±standard deviation) infiltrating white matter fiber tracts was 4.15 ± 9.23 ml. The median fraction of tumor volume infiltrating white matter fiber tracts was 26.3% ± 10.1%. Conclusions: Diffusion tensor MR Tractography is a reliable preoperative assessment tool since it detects extensive white matter infiltration by Astrocytoma irrespective of brain tumors volume. Recommendations: Prospective large population studies are required to clarify how infiltration relates to tumor location.

关键词： Tractography Astrocytoma Brain Tumor Corticospinal Tract Infiltration

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电催化合成氨的研究进展

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Chinese Journal of Catalysis 2023年第7期50卷 6-44页

作者：欧阳玲梁杰罗永嵩郑冬冬孙圣钧刘倩 mohamed S.hamdy 孙旭平应斌武四川大学华西医院检验科四川成都610041 电子科技大学基础与前沿研究院四川成都610054 山东师范大学化学化工与材料科学学院山东济南250014 成都大学高等研究院四川成都610106 哈立德国王大学理学院化学系阿卜哈沙特阿拉伯

氨是一种重要的工业原料,在化肥、染料、药品和炸药的制造中起着重要作用.由于氨的氢容量大、能量密度高且易于运输,被认为是一种潜在的无碳燃料.Haber-Bosch工艺实现了高附加值氨的大规模工业化生产,但其生产条件(400‒550ºC,15‒30 MPa... 详细信息

氨是一种重要的工业原料,在化肥、染料、药品和炸药的制造中起着重要作用.由于氨的氢容量大、能量密度高且易于运输,被认为是一种潜在的无碳燃料.Haber-Bosch工艺实现了高附加值氨的大规模工业化生产,但其生产条件(400‒550ºC,15‒30 MPa)苛刻,且伴随着高能耗和CO_(2)排放.因此,开发绿色和可持续的氨合成方法,同时实现全球环境的可持续性势在必行.电催化氮还原合成氨(NRR)是近年来的研究热点,该技术可以在环境条件下进行,且可利用电子作为绿色还原剂,水作为质子源.此外,该过程具有实现分散和现场按需生产氨的巨大潜力,支持分布式肥料生产,从而降低运输成本.除了N2作为氮源,对环境有害且活性高于N2的氮物种(如NO,NO_(2)^(−)/NO_(3)^(−))已被认为是实现环境条件下生产氨的有吸引力的氮源,电催化NO还原(NORR)和NO_(2)−/NO_(3)^(−)(NO_(x)^(−))还原(NtrRR)合成氨具有应用潜力.本文综述了近年来电催化合成氨的研究进展.首先简要介绍了三种电催化合成氨路线(NRR,NORR和NtrRR)的研究背景和意义.然后,对环境条件下合成氨电催化剂的最新研究进展进行了详细讨论,主要涉及催化机理、理论计算和电化学性能.最后,对人工电催化合成氨当前面临的挑战和未来的研究需求作了总结和展望,包括:(1)注重理论计算,通过理论计算可以预测可能的活性位点、吸附能和反应途径,有助于快速筛选合适的催化剂,大大降低实验成本;(2)发展先进的原位表征技术来观察电催化剂表面上的动态变化和捕获/识别反应中间体,促进对真实反应机理的探索,从而进一步指导催化剂的设计;(3)确保数据的准确性和可重复性;(4)合理设计有效的电催化剂.为了进一步提高现有材料体系对氨合成的催化性能,需要开发更高效的材料设计策略(如精确调节单原子金属的配位环境、掺杂原子/空位的类型和浓度、合理暴露特定的晶体面等),以促进电催化剂的内在活性.此外,通过优化电催化剂的形态,构建特殊的结构(如尖刺),可以暴露丰富的活性位点,显著提高其表观活性;(5)研究特定的电极材料时,除材料工程外,扩展实验条件也至关重要,包括电解质的pH值、应用电位和氮物种初始浓度等,可能会影响催化活性和选择性;(6)文献报道的稳定性测试通常在50 h以下,对于工业运行(预计在高电流密度下可以稳定运行数千小时)来说,时间太短.因此,未来的催化剂设计需要以更长的测试时间为目标;(7)未来研究应进一步探索真实环境下NORR/NtrRR的催化活性,以实现更高效的氨合成;(8)应开发一种可替代的氨分离技术.在传统的Haber-Bosch工艺中,通过冷凝,氨从未反应的N2和H_(2)中分离出来,耗能大,因此应采用比冷凝工艺能量输入更少的分离技术;(9)从实际应用角度出发,还应考虑综合的技术经济评估,包括材料成本、总能源成本、设备维护成本和产品分离成本等,以评估氨电合成的大规模可扩展性和商业可行性.综上,开展电催化合成氨领域的研究有望以绿色和可持续的方式缓解环境污染和未来的能源问题.

关键词：氨合成氮还原一氧化氮还原硝酸盐/亚硝酸盐还原电催化剂

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Enhanced N_(2)-to-NH_(3)conversion efficiency on Cu3P nanoribbon electrocatalyst

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Nano Research 2022年第8期15卷 7134-7138页

作者： Qian Liu Yiting Lin Shuang Gu Ziqiang Cheng Lisi Xie Shengjun Sun Longcheng Zhang Yongsong Luo Abdulmohsen Ali Alshehri mohamed Shamdy Qingquan Kong Jiahong Wang Xuping Sun Institute for Advanced Study Chengdu UniversityChengdu 610106China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China Shenzhen Engineering Center for the Fabrication of Two-Dimensional Atomic Crystals Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Chemistry Department Faculty of Science&Center of Excellence for Advanced Materials ResearchKing Abdulaziz UniversityP.O.Box 80203Jeddah 21589Saudi Arabia Catalysis Research Group(CRG) Department of ChemistryCollege of ScienceKing Khalid UniversityP.O.Box 9004Abha 61413Saudi Arabia

Ambient electroreduction of nitrogen(N_(2))is considered as a green and feasible approach for ammonia(NH_(3))synthesis,which urgently demands for efficient *** has close relationship with catalytic activity of heterogeneous *** is attractive nanostructure,which possesses the flexibility of one-dimensional nanomaterials,the large surface area of two-dimensional nanomaterials,and lateral size confinement *** this work,Cu_(3)P nanoribbon is proposed as a highly efficient electrocatalyst for N_(2)-to-NH_(3)conversion under benign *** measured in N_(2)-saturated 0.1 M HCl,such Cu_(3)P nanoribbon achieves high performance with an excellent Faradaic efficiency as high as 37.8%and a large yield of 18.9μg·h^(−1)·mgcat.−1 at−0.2 *** also demonstrates outstanding stability in long-term electrolysis test at least for 45 h.

关键词： Cu_(3)P nanoribbon nitrogen reduction reaction ammonia electrosynthesis electrocatalysis

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Evaluation of Bilateral Mental Nerve Block as an Alternative to General Anesthesia for Resection of Lower Lip Tumors

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Surgical Science 2017年第8期8卷 319-325页

作者： Ashraf Khater Islam A. Elzahaby mohamed hamdy Mohammad Zuhdy Omar hamdy mohamed Ezzat Mahmoud Abdelaziz Ahmad M. Farid Mansour Elmoatasem Amr Hassan Khalid Atallah Mahmoud Mostafa Saleh Maha A. Abo-Zeid Amr Yassin Ola Taha Abd Eldayem Mona Gad Department of Surgical Oncology Mansoura Oncology Center (OCMU) Faculty of Medicine Mansoura University Mansoura Egypt Anesthesia and Surgical Intensive Care Department Mansoura University Hospital Faculty of Medicine Mansoura University Mansoura Egypt

Objective: Nerve blockade is commonly used in oncosurgical procedures as an alternative to general anesthesia for older patients and those with significant medical problems. We report a single tertiary oncology center experience in performing various lip resections and reconstructive techniques using this technique. Patients and methods: sixty patients with lower lip tumors were enrolled into this study with exclusion of refusing, non-compliant and critically ill patients. A solution of 4 ml 2% Lidocaine and epinephrine was put in a 5 ml syringe. Half the solution (2 ml) was injected into each side with a 23 gauge needle and after 5 minutes the surgical resection was carried out after testing for anesthesia. Results: The mean age was 68 ± 6.2 years. The mean ASA score was 3 ± 0.75. There were 4 cases who expressed painful sensation and their operations were completed with fentanyl increments. Mean hospital stay was 1 ± 0.75 days. There were three cases of wound gaping who were treated with secondary closure in an outpatient basis. One patient expressed postoperative acute ischemic heart pain that was managed with anti-ischemic measurements. Conclusion: Bilateral mental nerve block is a safe and effective alternative to general anesthesia in lower lip tumors’ resection especially in older patients and those with poor tolerance for general anesthesia provided that there is no need for cervical nodal dissection.

关键词： Mental Nerve Block Lip Tumors Lidocaine

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Effect of Atrial Fibrillation on Acute Ischemic Stroke Severity

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Open Journal of Medical Imaging 2014年第2期4卷 95-101页

作者： Taha Kamel Alloush Mahmoud Haroun Ibrahim Nahed Salah El Dein Ahmed Ibrahim Ghada Samir El-Shahed Lobna mohamed Nabil El-Sayed mohamed hamdy Ibrahim Hosam Ahmed Azmy Faculty of Medicine Ain Shams University Cairo Egypt Ministry of Health Cairo Egypt

Objectives: To assess the impact of atrial fibrillation on stroke severity and short-term (1 month) mortality. Materials and Methods: Totally 200 patients admitted to Ain Shams University Specialized Hospital were recruited and diagnosed clinically to have acute ischemic stroke within 3 days. Patients with hemorrhagic infarctions were excluded. History taking about previous heart disease was taken, full general and neurological examinations were done. Full metabolic profile, full cardiac investigations, carotid duplex, MRI brain stroke protocol with initial clinical evaluation and after 1 month re-evaluation using (NIHSS ) scale. Results: All patients underwent transthoracic echocardiography which revealed absence of “A” wave corresponding to atrial fibrillation in 33 patients (16.5%). Those Patients with atrial fibrillation had a median NIHSS score of 11.00 with IQR of 6.00 - 18.50 at admission and 6.00 with IQR of 2.00 - 14.50 after one month. Patients with atrial fibrillation showed significantly higher NIHSS at admission than patients in sinus rhythm, P < 0.05. Magnetic resonance imaging findings showed that MRA showed significant intracranial vessel stenosis in 117 (79.1%) patients. 51 (34.4%) patients had lacunar infarction, 65 (43.9%) patients had partial anterior circulation infarction, 25 (16.2%) patients had posterior circulation infarction and 7 (4.7%) patients had total anterior circulation infarction. 111 (75%) patients showed leucoaraiosis. Conclusion: Atrial fibrillation was found not to have significantly statistical effect on stroke severity and short term mortality.

关键词： Atrial Fibrillation (AF)

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