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Rational design of Pd-TiO_(2)/g-C_(3)N_(4) heterojunction with enhanced photocatalytic activity through interfacial charge transfer

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Clean Energy 2019年第1期3卷 59-68页

作者： Tayirjan Taylor Isimjan Shahid Rasul maher nasser aloufi Mohd Adnan Khan Ibrahim Khalid Alhowaish Toseef Ahmed Fundamental Catalysis SABIC-CRD at KAUSTThuwalSaudi Arabia King Abdullah University of Science and Technology(KAUST) Physical Science and Engineering DivisionThuwal23955-6900Saudi Arabia SABIC Technology Center RiyadhSaudi Arabia

A hybrid heterojunction-based photocatalyst is synthesized by an electrostatic self-assembly strategy including surface modification and controlled metal *** interfacial contact was made by mixing negatively charged anatase TiO_(2) nanoparticles with positively charged ***-light deposition of Pd nanoparticles largely on TiO_(2) was made possible due to the charge transfer from C_(3)N_(4)(excited by visible light)to the conduction band of TiO_(2) reducing Pd ions on contact with its *** order to further test the efficiency of this cascade of electron transfer across the conduction bands of the two semiconductors,photocatalytic H2 production from water was *** optimizing the ratio of the two semiconductors,increased H2 production rates were observed and attributed to enhanced charge *** were studied by a variety of techniques in order to probe into their properties and link them to *** reaction rate,under visible-light excitation,of the best sample showed an 8-fold enhancement when compared to that of Pd-C_(3)N_(4) in identical conditions and the highest apparent quantum yield of 31%was achieved by a 0.1% Pd/20%TiO_(2)/C_(3)N_(4) sample in a 420-to 443-nm range.

关键词： surface charge heterojunction photocatalyst electrostatic self-assembly hydrogen generation

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Eletromagnetic Detection of Mild Brain Injury: A Novel Imaging Approach to Post Concussive Syndrome

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Journal of Biomedical Science and Engineering 2021年第11期14卷 347-360页

作者： James Rizkalla David Botros nasser Alqahtani Mounica Patnala Paul Salama Felipe Pablo Perez maher Rizkalla Baylor University Medical Center Dallas Texas USA John Hopkins Medicine Department of Neurology Baltimore MD USA Department of Electrical and Computer Engineering Indiana University Purdue University Indianapolis (IUPUI) In-dianapolis IN USA Department of Medicine Indiana University School of Medicine Indianapolis IN USA

Introduction: Mild traumatic brain injury (mTBI) is a common injury, with nearly 3 - 4 million cases annually in the United States alone. Neuroimaging in patients with mTBI provides little benefit, and is usually not indicated as the diagnosis is primarily clinical. It is theorized that microvascular trauma to the brain may be present in mTBI, that may not be captured by routine MRI and CT scans. Electromagnetic (EM) waves may provide a more sensitive medical imaging modality to provide objective data in the diagnosis of mTBI. Methods: COMSOL simulation software was utilized to mimic the anatomy of the human skull including skin, cranium, cerebrospinal fluid (CSF), gray-matter tissue of the brain, and microvasculature within the neural tissue. The effects of penetrating EM waves were simulated using the finite element analysis software and results were generated to identify feasibility and efficacy. Frequency ranges from 7 GHz to 15 GHz were considered, with 0.6 and 1 W power applied. Results: Variations between the differing frequency levels generated different energy levels within the neural tissue—particularly when comparing normal microvasculature versus hemorrhage from microvasculature. This difference within the neural tissue was subsequently identified, via simulation, serving as a potential imaging modality for future work. Conclusion: The use of electromagnetic imaging of the brain after concussive events may play a role in future mTBI diagnosis. Utilizing the proper depth frequency and wavelength, neural tissue and microvascular trauma may be identified utilizing finite element analysis.

关键词： Brain Injury Trauma Imaging Simulation COMSOL

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Immune microenvironment of medulloblastoma:The association between its molecular subgroups and potential targeted immunotherapeutic receptors

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World Journal of Clinical Oncology 2023年第3期14卷 117-130页

作者： maher Kurdi nasser Mulla Husam Malibary Ahmed K Bamaga Motaz M Fadul Eyad Faizo Sahar Hakamy Saleh Baeesa Department of Pathology Faculty of MedicineKing Abdulaziz UniversityRabigh 213733Saudi Arabia Neuromuscular Unit King Fahad Medical Research CenterKing Abdulaziz UniversityJeddah 213733Saudi Arabia Department of Internal Medicine Faculty of MedicineTaibah UniversityMedina 213733Saudi Arabia Department of Internal Medicine Faculty of MedicineKing Abdulaziz UniversityJeddah 213733Saudi Arabia Department of Paediatrics Faculty of MedicineKing Abdulaziz UniversityJeddah 213733Saudi Arabia Division of Neurosurgery Department of SurgeryFaculty of MedicineTabuk UniversityTabuk 213733Saudi Arabia Neurmuscular Unit Center of Excellence of Genomic MedicineJeddah 21423Saudi Arabia Department of Neuroscience King Faisal Specialist Hospital and Research CenterJeddahSaudi Arabia

Medulloblastoma(MB)is considered the commonest malignant brain tumor in *** treatments consisting of surgery,radiation,and chemotherapy have improved patients’***,the recurrence occurs in 30%of *** persistent mortality rates,the failure of current therapies to extend life expectancy,and the serious complications of non-targeted cytotoxic treatment indicate the need for more refined therapeutic *** MBs originating from the neurons of external granular layer line the outer surface of neocerebellum and responsible for the afferent and efferent ***,MBs have been segregated into four molecular subgroups:Wingless-activated(WNT-MB)(Group 1);Sonichedgehog-activated(SHH-MB)(Group 2);Group 3 and 4 *** molecular alterations follow specific gene mutations and disease-risk *** current treatment protocols and ongoing clinical trials against these molecular subgroups are still using common chemotherapeutic agents by which their efficacy have improved the progression-free survival but did not change the overall ***,the need to explore new therapies targeting specific receptors in MB microenvironment became *** immune microenvironment of MBs consists of distinctive cellular heterogeneities including immune cells and none-immune *** associate macrophage and tumour infiltrating lymphocyte are considered the main principal cells in tumour microenvironment,and their role are still under *** this review,we discuss the mechanism of interaction between MB cells and immune cells in the microenvironment,with an overview of the recent investigations and clinical trials.

关键词： Medulloblastoma Tumour microenvironment Tumour associated macrophages Tumour infiltrating lymphocyte Immunotherapies

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