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- 검색키워드
- 저자 : Ajith M. Thomas (검색결과 5 건)
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M. Swedha,Abdulrahman A. Alatar,Mohammad K. Okla,Ibrahim A. Alaraidh,Asmaa Mohebaldin,Mohammed Aufy,Lija L. Raju,Ajith M. Thomas,Mostafa A. Abdel-Maksoud,S. Sudheer Khan 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.112 No.-
Visible light photocatalysis using nano heterostructures offers an eco-friendly alternative for the removalof organic molecules. Here, we reported an enhanced photocatalytic activity of g-C3N4/Ni3(VO4)2/ZnCr2O4, a dual Z-scheme nano-heterojunction for the photocatalytic removal of p-chlorophenol (p-CP)and 5-fluorouracil (5-FU). The nano heterojunction was fabricated by a facile co-precipitation method. Initially, the fabricated nanocomposites (NCs) were characterized for Physico-chemical and optoelectronicproperties, by XRD, XPS, SEM, TEM, UV–Visible DRS, BET, PL, and EIS. The fabricated g-C3N4/Ni3(VO4)2/ZnCr2O4 has shown excellent photocatalytic activity. The complete mineralization of both p-CP and 5-FU observed after 160 and 200 min of visible light irradiation respectively. The mineralizationof p-CP and 5-FU was confirmed by total organic carbon (TOC) estimation and the percentage of removalTOC for p-CP and 5-FU was 99.25% and 98.9% respectively. The stability of the particle was confirmed bysix cycles test. The reusable efficiency of the NCs was found to be 99.7% after six consequent cycles. Thestability of the NCs was confirmed by XRD and XPS analysis of reused photocatalyst. The scavengers assayand ESR analysis confirmed the major role of OH radicals in enhanced photocatalytic activity. The degradationpathway of p-CP and 5-FU was determined by GC–MS/MS and the possible toxicity of the intermediatecompounds was determined by the ECOSAR program, which shows the non-toxic nature ofthe end product on green algae, daphnia, and fish. The toxicity of the NCs was tested against Allium cepawhich further confirm the non-toxic nature of NCs. The study suggests that fabricated g-C3N4/Ni3(VO4)2/ZnCr2O4 NCs can be utilized for environmental remediation applications.
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Middle Meningeal Artery Arising from the Basilar Artery
Mohamed M. Salem,Matthew R. Fusco,Parviz Dolati,Arra S. Reddy,Bradley A. Gross,Christopher S. Ogilvy,Ajith J. Thomas 대한뇌혈관외과학회 2014 Journal of Cerebrovascular and Endovascular Neuros Vol.16 No.4
Various anomalies for the origin of the middle meningeal artery (MMA)have been described in the literature. However, origin of the MMA fromthe basilar trunk is an extremely rare variant. We report on a 54-year-oldfemale who presented with frequent headaches; magnetic resonanceimaging showed a right parietal meningioma. The abnormal origin of themiddle meningeal artery from the basilar artery was diagnosed by angiographyperformed for preoperative embolization of the tumor. We reporton the case with a review of the embryologic basis, possible explanationsfor this aberrant origin, and its clinical implications.
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Strain induced structural transformation, mechanical and phonon stability in silicene derived 2D-SiB
Manju M.S.,Siby Thomas,Anees P.,Sang Uck Lee,Ajith K. M. 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.90 No.-
Two-dimensional monolayer SiB is a silicene derivative exhibiting buckling of atoms similar to that seenin silicene. This manuscript presents a systematic study of the strain-dependent variation of thestructural, mechanical, and dynamical properties of SiB. Strain was applied in the uniaxial armchair,uniaxial zigzag, and biaxial directions within the range of0.2 to 0.3. The resultant strain energy plotindicates anisotropic behavior of SiB in these directions. The SiB showed a mechanical strength that washigher than its counterpart, silicene, by an order of 30%. The elastic constant data from the undeformedSiB indicated an anisotropic nature, which was also seen with all the strain directions. Charge densitycontours, along with Bader charge analysis, confirmed the ionic nature of SiB in its original form. Thisnature became covalent as the strain varied from the compressive to the tensile regime in the uniaxialzigzag and biaxial directions. The majorfinding described in this manuscript is a newflat conformationhaving orthorhombic symmetry in contrast to the buckled structure. In addition, this material wasobserved to attain stability with the application of uniaxial tensile armchair and zigzag directionalstrains. Ab-initio molecular dynamics simulation confirmed the thermal stability of SiB in its newconformation.
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Shooka Esmaeeli,Courtney M. Hrdlicka,Andres Brenes Bastos,Jeffrey Wang,Santiago Gomez-Paz,Khalid A. Hanafy,Vasileios-Arsenios Lioutas,Christopher S. Ogilvy,Ajith J. Thomas,Shahzad Shaefi,Corey R. Fehn 대한신경집중치료학회 2020 대한신경집중치료학회지 Vol.13 No.1
Background: Transcranial Doppler (TCD) ultrasound is an essential tool for the detection of cerebral vasospasm after subarachnoid hemorrhage (SAH) but is limited by the availability of skilled operators. We examined the clinical feasibility and concordance of a robotically assisted TCD system with artificial intelligence with routine handheld TCD after SAH. Methods: We evaluated TCD velocities in the anterior cerebral artery (ACA) and middle cerebral artery (MCA) of two patients with high-grade SAH and angiographic evidence of vasospasm. A single channel TCD device with a handheld diagnostic probe as well as a robotically assisted TCD device was used, the relationship of the two tests was evaluated using the bootstrap method of resampling for the concordance correlation coefficient (CCC) paired with a Pearson’s correlation analysis, followed by a Bland-Altman plot. Results: Patient 1 developed angiographic and TCD evidence of vasospasm in the proximal right MCA, but except for periods of disorientation remained neurologically intact. Angiographic, TCD and clinical evidence of ACA spasm occurred 6 days after ictus in patient 2. Robotically measured mean flow velocities were comparable to manual TCDs in the MCAs (CCC=0.83; 95% confidence interval [CI], 0.42 to 0.96; P=0.001) but not in the ACAs (CCC=0.26; 95% CI, –0.01 to 0.71; P=0.26). Conclusion: Robotically assisted TCD system with artificial intelligence provides an alternative to manual TCD for assessment of MCA velocities in patients with SAH, expanding the availability of TCD to settings in which specialized clinicians are not available. Further studies for validation of this technology are warranted.
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Preoperative Embolization of Extra-axial Hypervascular Tumors with Onyx
Matthew R. Fusco,Bradley A. Gross,Mohamed M. Salem,Arra S. Reddy,Christopher S. Ogilvy,Ekkehard M. Kasper,Ajith J. Thomas 대한뇌혈관외과학회 2016 Journal of Cerebrovascular and Endovascular Neuros Vol.18 No.1
Objective:Preoperative endovascular embolization of intracranial tumors is performed to mitigate anticipated intraoperative blood loss. Although the usage of a wide array of embolic agents, particularly polyvinyl alcohol (PVA), has been described for a variety of tumors, literature detailing the efficacy, safety and complication rates for the usage of Onyx is relatively sparse. Materials and Methods:We reviewed our single institutional experience with pre-surgical Onyx embolization of extra-axial tumors to evaluate its efficacy and safety and highlight nuances of individualized cases. Results:Five patients underwent pre-surgical Onyx embolization of large or giant extra-axial tumors within 24 hours of surgical resection. Four patients harbored falcine or convexity meningiomas (grade I in 2 patients, grade II in 1 patient and grade III in one patient), and one patient had a grade II hemangiopericytoma. Embolization proceeded uneventfully in all cases and there were no complications. Conclusion:This series augments the expanding literature confirming the safety and efficacy of Onyx in the preoperative embolization of extra-axial tumors, underscoring its advantage of being able to attain extensive devascularization via only one supplying pedicle.
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