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Synthesis and in vitro antimicrobial screening of new pyrano[4,3-b]pyrane derivatives of 1H-pyrazole

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Chinese Chemical Letters 2012年第1期23卷 57-60页

作者： chetan B.Sangani Divyesh C.Mungra Manish P.Patel Ranjan G.Patel Department of Chemistry Sardar Patel UniversityVallabh Vidyanagar 388120GujaratIndia

A new series of pyrano[4,3-b]pyrane 4a-l bearing 1H-pyrazole has been synthesized by one pot base catalyzed cyclocondensation reaction of 1H-pyrazole-4-carbaldehyde la-1,malononitrile 2 and 4-hydroxy-6-methylpyrone *** the synthesized compounds were screened against six bacterial pathogens,namely ***,***,***,***,***, *** and antifungal activity against,two fungal pathogens,*** and *** using broth microdilution MIC method. Some of the compounds are found to be equipotent or more potent than that of commercial drugs,against most of employed strains.

关键词： Pyranopyrane MCR Pyrazole-4-carbaldehyde Antimicrobial activity

One step synthesis of pyrido[1,2-a]benzimidazole derivatives of aryloxypyrazole and their antimicrobial evaluation

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Chinese Chemical Letters 2013年第2期24卷 123-126页

作者： Hardik H.Jardosh chetan B.Sangani Manish P.Patel Ranjan G.Patel Department of Chemistry Sardar Patel UniversityVallabh Vidyanagar-388120GujaratIndia

Received 3 September 2012 Received in revised form 16 October 2012 Accepted 31 December 2012 Available online 6 February 2013

关键词： AryloxypyrazolePyrido[ 1 2-a]benzimidazoleMulticomponent reactionAntimicrobial activity

Parallel Deformation of the Metals

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Modeling and Numerical Simulation of Material Science 2013年第3期3卷 79-83页

作者： chetan Nikhare Mechanical Engineering Department The Pennsylvania State University Erie USA

The metal goes into the plastic deformation after the application of external load. Most of the metal forming industries work on this principle of plastic deformation. Thus the understanding of plastic deformation in the metal forming industry is important. The research on the single material plastic deformation has been carried out from many centuries before the era of Tresca. In this study the two metals 0.05% C steel annealed (soft metal) and 0.6% C steel quenched and tempered (hard metal) were deformed plastically in the parallel combination in the composite form. This study has been carried out with simple mathematical theory and simulated numerical model. The comparison shows the exact match between the mathematical and numerical results. It is also observed that the individual metal thickness affects the deformation flow curve.

关键词： Plasticity Bi-Metal Metal Forming Mathematical Model Numerical Model

Use of three-dimensional printing in preoperative planning in orthopaedic trauma surgery: A systematic review and meta-analysis

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World Journal of Orthopedics 2020年第1期11卷 57-67页

作者： Catrin Morgan chetan Khatri Sammy A Hanna Hutan Ashrafian Khaled M Sarraf Trauma and Orthopaedics Imperial College NHS TrustLondon W21NYUnited Kingdom The Royal London Hospital Barts Health NHS TrustLondon E11BBUnited Kingdom Department of Surgery and Cancer Imperial College LondonLondon W21NYUnited Kingdom

BACKGROUND With the increasing complexity of surgical interventions performed in orthopaedic trauma surgery and the improving technologies used in threedimensional(3D)printing,there has been an increased interest in the *** has been shown that 3D models allow surgeons to better visualise anatomy,aid in planning and performing complex *** is however not clear how best to utilise the technique and whether this results in better *** To evaluate the effect of 3D printing used in pre-operative planning in orthopaedic trauma surgery on clinical *** We performed a comprehensive systematic review of the literature and a ***,Ovid and Embase were searched from inception to February 8,*** controlled trials,case-control studies,cohort studies and case series of five patients or more were included across any area of orthopaedic *** primary outcomes were operation time,intra-operative blood loss and fluoroscopy *** Seventeen studies(922 patients)met our inclusion criteria and were *** use of 3D printing across all specialties in orthopaedic trauma surgery demonstrated an overall reduction in operation time of 19.85%[95%confidence intervals(CI):(-22.99,-16.71)],intra-operative blood loss of 25.73%[95%CI:(-31.07,-20.40)],and number of times fluoroscopy was used by 23.80%[95%CI:(-38.49,-9.10)].CONCLUSION Our results suggest that the use of 3D printing in pre-operative planning in orthopaedic trauma reduces operative time,intraoperative blood loss and the number of times fluoroscopy is used.

关键词： Orthopaedic surgery Trauma Three-dimensional printing

Limited brain magnetic resonance imaging for evaluation of non-traumatic pediatric head emergencies

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World Journal of Clinical Pediatrics 2015年第3期4卷 35-37页

作者： chetan Chandulal Shah Ashishkumar K Parikh Mayo Clinic Wolfson Children Hospital

Limited brain magnetic resonance imaging(MRI) consisting of axial fluid attenuated inversion recovery, axial diffusion weighted imaging, coronal single shot fast spin echo(SSFSE) and sagittal SSFSE can be performed in under 5 min of scan time. This approach may provide more information than a non-contrast head computed tomography(CT) in non-traumatic pediatric head emergency, avoid ionizing radiation from CT scan and stratify patients who need more detailed brain MRI. Research studies are required to provide evidence for feasibility of such an approach.

关键词： Magnetic resonance imaging Head Brain Pediatric head emergency Computed tomography Pediatric Emergency

Experimental demonstration of SnO_(2) nanofiber-based memristors and their data-driven modeling for nanoelectronic applications

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Chip 2023年第4期2卷 142-153页

作者： Soumi Saha Madadi chetan Kodand Reddy Tati Sai Nikhil Kaushik Burugupally Sanghamitra DebRoy Akshay Salimath Venkat Mattela Surya Shankar Dan Parikshit Sahatiya Department of Electrical&Electronics Engineering Birla Institute of Technology and Science PilaniHyderabad CampusHyderabad 500078India Department of Computer Science and Information Systems Birla Institute of Technology and Science PilaniHyderabad CampusHyderabad 500078India Nanomagnetic Division Ceremorphic India Pvt LtdIndia Ceremorphic Inc.San JoseCA 95131USA

This paper demonstrated the fabrication,characterization,datadriven modeling,and practical application of a 1D SnO_(2)nanofiber-based memristor,in which a 1D SnO_(2)active layer wassandwiched between silver(Ag)and aluminum(Al)*** yielded a very high ROFF:RON of~104(ION:IOFF of~105)with an excellent activation slope of 10 mV/dec,low set voltage ofVSET~1.14 V and good *** paper physically explained the conduction mechanism in the layered SnO_(2)*** conductive network was composed of nanofibersthat play a vital role in the memristive action,since more conductive paths could facilitate the hopping of electron *** structures experimentally extracted with the adoption of ultraviolet photoelectron spectroscopy strongly support the claimsreported in this *** machine learning(ML)–assisted,datadriven model of the fabricated memristor was also developedemploying different popular algorithms such as polynomialregression,support vector regression,k nearest neighbors,andartificial neural network(ANN)to model the data of the *** have proposed two types of ANN models(type I andtype II)algorithms,illustrated with a detailed flowchart,to modelthe fabricated *** with standard ML techniques shows that the type II ANN algorithm provides the bestmean absolute percentage error of 0.0175 with a 98%R^(2)*** proposed data-driven model was further validated with the characterization results of similar new memristors fabricated adoptingthe same fabrication recipe,which gave satisfactory ***,the ANN type II model was applied to design and implementsimple AND&OR logic functionalities adopting the fabricatedmemristors with expected,near-ideal characteristics.

关键词： Nanofiber-based memristors Data-driven modeling Artificial neural network(ANN) SnO_(2)

Clinical significance of prostate 18F-labelled fluorodeoxyglucose uptake on positron emission tomography/computed tomography:A five-year review

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World Journal of Radiology 2017年第9期9卷 350-358页

作者： Madhurima R chetan Tristan Barrett Ferdia A Gallagher School of Clinical Medicine University of Cambridge Department of Radiology Addenbrooke’s Hospital and University of Cambridge

AIM To determine the significance and need for investigation of incidental prostatic uptake in men undergoing ^(18)F-labelled fluorodeoxyglucose(^(18)F-FDG) positron emission tomography/computed tomography(PET/CT) for other *** Hospital databases were searched over a 5-year period for patients undergoing both PET/CT and prostate magnetic resonance imaging(MRI). For the initial analysis, the prostate was divided into six sectors and suspicious or malignant sectors were identified using MRI and histopathology reports respectively. Maximum and mean ^(18)F-FDG standardised uptake values were measured in each sector by an investigator blinded to the MRI and histopathology findings. Two agematched controls were selected per case. Results were analysed using a paired t-test and one-way ANOVA. For the second analysis, PET/CT reports were searched for prostatic uptake reported incidentally and these patients were followed up. RESULTS Over a 5-year period, 15 patients underwent both PET/CT and MRI and had biopsy-proven prostate *** prostatic sectors had a trend to higher ^(18)F-FDG uptake than benign sectors, however this was neither clinically nor statistically significant(3.13 ±0.58 vs 2.86 ± 0.68, P > 0.05). ^(18)F-FDG uptake showed no correlation with the presence or histopathological grade of tumour. ^(18)F-FDG uptake in cases with prostate cancer was comparable to that from age-matched controls. Forty-six(1.6%) of 2846 PET/CTs over a 5-year period reported incidental prostatic uptake. Of these, 18(0.6%) were investigated by PSA, 9(0.3%)were referred to urology, with 3(0.1%) undergoing MRI and/or biopsy. No cases of prostate cancer were diagnosed in patients with incidental ^(18)F-FDG uptake in our institute over a 5-year *** ^(18)F-FDG uptake overlaps significantly between malignant and benign prostatic conditions. Subsequent patient management was not affected by the reporting of incidental focal prostatic uptake in this cohor

关键词： 18F-labelled fluorodeoxyglucose Positron emission tomography reporting Positron emission tomography/computed tomography Prostate cancer Magnetic resonance imaging

Prediction of fracture limits of Ni-Cr based alloy under warm forming condition using ductile damage models and numerical method

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Transactions of Nonferrous Metals Society of China 2021年第8期31卷 2372-2387页

作者： Ayush MORCHHALE Anand BADRISH Nitin KOTKUNDE Swadesh Kumar SINGH Navneet KHANNA Ambuj SAXENA chetan NIKHARE Department of Mechanical Engineering Birla Institute of Technology and Science-PilaniHyderabad CampusHyderabadIndia Mechanical Engineering Department Gokaraju Rangaraju Institute of Engineering and TechnologyHyderabadIndia Advanced Manufacturing Laboratory Institute of Infrastructure Technology Research and Management(IITRAM)AhmadabadIndia Department of Mechanical Engineering G.L.Bajaj Institute of Technology and ManagementGreater NoidaIndia Mechanical Engineering Department the Pennsylvania State UniversityEriePAUnited States

The stretch forming and the deep-drawing processes were carried out at 300 and 673 K to determine the safe forming and fracture limits of IN625 *** experimentally obtained strain-based fracture forming limit diagram(FFLD)was transformed into a stress-based(σ-FFLD)and effective plastic strain(EPS)vs triaxiality(η)plot to remove the excess dependency of fracture limits over the *** the prediction of fracture limits,seven different damage models were *** Oh model displayed the best ability to predict the fracture locus with the least absolute *** the experimentally obtained fracture limits have only been used for the numerical analysis,none of the considered damage models predicted the fracture strains over the entire considered range of stress triaxiality(0.33<η<0.66).The deep drawing process window helped to determine wrinkling,safe and fracture zones while drawing the cylindrical cups under different temperature and lubricating ***,the highest drawing ratio of 2 was achieved at 673 K under the lubricating *** the numerically predicted results of both stretch forming and deep drawing processes using the Hill 1948 anisotropic yielding function were found to be good within the acceptable range of error.

关键词： IN625 alloy warm forming ductile damage models formability forming limit diagram deep drawing processing window finite element analysis

Liver transplantation for hepatocellular carcinoma in India: Are we ready for 2040?

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World Journal of Transplantation 2024年第1期14卷 141-153页

作者： Hirak Pahari Amruth Raj Ambreen Sawant Dipak S Ahire Raosaheb Rathod chetan Rathi Tushar Sankalecha Sachin Palnitkar Vikram Raut Department of Liver Transplant and HPB Surgery Medicover HospitalsNavi Mumbai 410210MaharashtraIndia Department of Liver Transplant Anaesthesia Medicover HospitalsNavi Mumbai 410210MaharashtraIndia Department of Gastroenterology and Hepatology Medicover HospitalsNavi Mumbai 410210India Department of Gastroenterology and Hepatology Medicover HospitalsNavi Mumbai 410210MaharashtraIndia Department of Gastroenterology and Hepatology Medicover HospitalsAurangabad 431003India Department of Gastroenterology and Hepatology Medicover HospitalsNashik 422009India Department of Gastroenterology and Hepatology Medicover HospitalsPune 411026India

BACKGROUND Liver transplantation(LT)for hepatocellular carcinoma(HCC)has been widely researched and is well established *** cornerstone of this treatment lies in the various criteria formulated by expert consensus and *** variations among the criteria are staggering,and the short-and long-term outcomes are *** To study the differences in the current practices of LT for HCC at different centers in India and discuss their clinical implications in the *** We conducted a survey of major centers in India that performed LT in December 2022.A total of 23 responses were *** centers were classified as high-and low-volume,and the current trend of care for patients undergoing LT for HCC was *** Of the 23 centers,35%were high volume center(>500 Liver transplants)while 52%were high-volume centers that performed more than 50 transplants/*** 39%of centers had performed>50 LT for HCC while the percent distribution for HCC in LT patients was 5%–15%in approximately 73%of the *** a few,most centers were divided equally between University of California,San Francisco(UCSF)and center-specific criteria when choosing patients with HCC for LT,and most(65%)did not have separate transplant criteria for deceased donor LT and living donor LT(LDLT).Most centers(56%)preferred surgical resection over LT for a Child A cirrhosis patient with a resectable 4 cm HCC ***-emission tomography-computed tomography(CT)was the modality of choice for metastatic workup in the majority of centers(74%).Downstaging was the preferred option for over 90%of the centers and included transarterial chemoembolization,transarterial radioembolization,stereotactic body radiotherapy and atezolizumab/bevacizumab with varied *** alphafetoprotein(AFP)cut-off was used by 74%of centers to decide on transplantation as well as to downstage tumors,even if they met the *** criteria for successful downstaging v

关键词： Hepatocellular carcinoma Liver transplant India Downstaging Survey Milan University of California,San Francisco Portal vein tumor thrombus Expanded criteria