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Prognostic Role of Preoperative Tricuspid Annular Plane Systolic Excursion (TAPSE) in Mitral Valve Replacement (MVR) for Rheumatic Mitral Stenosis Patients

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World Journal of Cardiovascular Surgery 2024年第8期14卷 115-130页

作者： Satyajit Sharma Muhit Abdullah Md. Noor-E-Elahi Mozumder Munjerin Refat Synthee Md. Zafar-Al-Nimari Anowarul Azim Saikat Das Gupta Dewan Iftakher Raza chowdhury Siddhartha Shankar Howlader Noel Crypian Gomes Saleh Ahmed Samir Kumar Biswas Department of Cardiac Surgery National Heart Foundation Hospital & Research Institute (NHFH & RI) Dhaka Bangladesh Department of Cardiac Surgery National Institute of Cardiovascular Diseases & Hospital Dhaka Bangladesh Department of Cardiothoracic and Vascular Surgery Square Hospital Dhaka Bangladesh Department of Cardiothoracic and Vascular Surgery Evercare Hospital Chattogram Bangladesh

Tricuspid annular plane systolic excursion has been proposed as a simple and reproducible parameter for quantitative assessment of the right ventricular ejection fraction. The prognostic importance of preoperative TAPSE in patients with mitral valve replacement for rheumatic mitral stenosis patients is still under focused. Therefore, the objective of the study was to predict the outcome after MVR in rheumatic mitral stenosis patients in relation to preoperative TAPSE. This comparative cross-sectional study was conducted at the Department of Cardiac Surgery, National Heart Foundation Hospital and Research Institute. A total of 72 patients of rheumatic mitral stenosis patients who underwent mitral valve replacement were included in the study. They were divided into two groups: Group A and B. Group A included 36 patients with TAPSE 0.05) except for the preoperative TAPSE. Mean TAPSE of Group A was 13.17 (±1.40) and Group B was 18.61 (±1.57), the difference was statistically significant (p 0.05). Among the postoperative complications, including postoperative atrial fibrillation was higher in Group A (30.56%) than Group B (11.11%), mean ventilation time was higher in Group A (27.78%) than Group B (5.56%), length of intensive care was higher in Group A (33.33%) than Group B (11.12%), and hospital stay was higher in Group A (25.0%) than Group B (5.56%), (p < 0.05). Higher preoperative TASPE could be used as a prognostic tool for MVR in rheumatic mitral stenosis patients in our settings.

关键词： Tricuspid Annular Plane Systolic Excursion Mitral Valve Replacement Rheumatic Heart Disease Mitral Stenosis Right Ventricular Ejection Fraction Postoperative Complications

OH and O radicals production in atmospheric pressure air/Ar/H_2O gliding arc discharge plasma jet

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Plasma Science and Technology 2017年第12期19卷 71-80页

作者： N C ROY M R TALUKDER A N chowdhury Plasma Science and Technology Laboratory Department of Applied Physics and Electronic EngineeringUniversity of RajshahiRajshahi 6205Bangladesh Bangladesh Council of Scientific and Industrial Research Laboratory Rajshahi Rajshahi 6206Bangladesh

Atmospheric pressure air/Ar/H_2O gliding arc discharge plasma is produced by a pulsed dc power supply. An optical emission spectroscopic（OES） diagnostic technique is used for the characterization of plasmas and for identifications of OH and O radicals along with other species in the plasmas. The OES diagnostic technique reveals the excitation Tx？≈？5550–9000 K, rotational Tr？≈？1350–2700 K and gas Tg？≈？850–1600 K temperatures, and electron density n？（1.1-1.9） ′101 4 cm^（-3） e under different experimental conditions. The production and destruction of OH and O radicals are investigated as functions of applied voltage and air flow rate. Relative intensities of OH and O radicals indicate that their production rates are increased with increasing Ar content in the gas mixture and applied voltage. nereveals that the higher densities of OH and O radicals are produced in the discharge due to more effective electron impact dissociation of H_2O and O_2 molecules caused by higher kinetic energies as gained by electrons from the enhanced electric field as well as by enhanced n *** productions of OH and O are decreasing with increasing air flow rate due to removal of Joule heat from the discharge region but enhanced air flow rate significantly modifies discharge maintenance properties. Besides, Tgsignificantly reduces with the enhanced air flow rate. This investigation reveals that Ar plays a significant role in the production of OH and O radicals.

关键词： reactive oxygen species(ROS) optical emission spectroscopy(OES) gliding arc discharge plasma kinetics broadening mechanism

Parimal chowdhury's work on smoking related pancreatic disorders

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World Journal of Gastrointestinal Pathophysiology 2011年第3期2卷 57-60页

作者： Parimal chowdhury Department of Physiology and Biophysics Faculty of MedicineUniversity of Arkansas for Medical Sciences4301 W Markham StreetLittle RockAR 72205 United States

Cigarette smoking is a known risk factor for the development of numerous diseases. The role of nicotine in the induction of pancreatic inflammation and pancreatic cancer as a result of cigarette smoking has been recognized and reported in the literature. The mechanism by which nicotine induces such pathologies is as yet unknown. An understanding of the proliferative potential of nicotine in primary and tumor cells of the pancreas will allow us to develop measures that will ultimately lead to intervention,prevention and treatment of these diseases. Studies show that nicotine can increase the cell numbers of certain cancer cell lines,suggesting that exposure to nicotine can lead to the disruption of the dynamic balance between cell death and proliferation,which is required for normal functioning of cells. We hypothesize that nicotine induces oxidative stress in pancreatic acinar cells and thus contributes to this disruption. We have used the AR42J cell line in our study because of its stability as an immortal tumor cell line and its known physiological similarity to primary acinar cells. Our studies show that mitogen activated protein kinase signaling is induced bynicotine in AR42J cells,causing an increase in lipid peroxidation and a subsequent decrease in cell function. Our data suggest that exposure to nicotine induces oxidative stress,leading to cell injury and compromised function,thus implicating cigarette smoking as a plausible mechanism.

关键词： Nicotine AR42J cell Effect on mechanisms Lipid peroxidation MAPK signaling Cell function

Design and simulation of a novel GaN based resonant tunneling high electron mobility transistor on a silicon substrate

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Journal of Semiconductors 2015年第4期36卷 36-39页

作者： Subhra chowdhury Swarnabha Chattaraj Dhrubes Biswas Advanced Technology Development Center Indian Institute of Technology Kharagpur Electronics and Electrical Communication Engineering Indian Institute of Technology Kharagpur

For the first time, we have introduced a novel GaN based resonant tunneling high electron mobility transistor （RTHEMT） on a silicon substrate. A monolithically integrated GaN based inverted high electron mobility transistor （HEMT） and a resonant tunneling diode （RTD） are designed and simulated using the ATLAS simulator and MATLAB in this study. The 10% Al composition in the barrier layer of the GaN based RTD structure provides a peak-to-valtey current ratio of 2.66 which controls the GaN based HEMT performance. Thus the results indicate an improvement in the current-voltage characteristics of the RTHEMT by controlling the gate voltage in this structure. The introduction of silicon as a substrate is a unique step taken by us for this type of RTHEMT structure.

关键词： RTD HEMT RTHEMT current-voltage characteristics

An all-optical scheme of signed digit binary addition based on optical non-linear material

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Optoelectronics Letters 2008年第6期4卷 447-451页

作者： Kuladeep Roy chowdhury Sourangshu Mukhopadhyay Department of Physics The University of BurdwanGolapbag

We propose a new integrated method which covers addition of any two signed digit numbers in all-optical domain. To implement this scheme we have exploited some photo-refractive characters of optical non-linear materials,which may experience 0.1-0.2dB attenuation loss as silica is used as non-linear medium. Moreover,the attenuation loss may be reduced to 0.001 dB/m if we consider the use of slow light at 1.56μm.

关键词：二进制算法计算机技术光学非线性材料光学应用

Pregnancy and Crohn’s disease:concerns and assurance of medical therapy

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Gastroenterology Report 2022年第1期10卷 171-177页

作者： Reezwana chowdhury Sunanda V.Kane Division of Gastroenterology and Hepatology Department of MedicineJohns Hopkins UniversityBaltimoreMDUSA Division of Gastroenterology and Hepatology Department of MedicineMayo ClinicRochesterMNUSA

Approximately 50%of patients with inflammatory bowel disease including both Crohn’s disease and ulcerative colitis are female with many being diagnosed and treated during their reproductive *** is important for women to be in remission prior to and during *** have been many advances in the treatment of inflammatory bowel disease,including new *** this review,we summarize the currently approved medications for Crohn’s disease and their safety in pregnancy and *** totality of evidence suggests that the majority of therapies are low-risk before and during pregnancy,and should be continued to control maternal disease.

关键词： Crohn’s disease pregnancy teratogenicity inflammatory bowel disease lactation biologics anti-TNF

Dissipation of pencycuron in rice plant

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2005年第8期6卷 756-758页

作者： PAL R. CHAKRABARTI K CHAKRABORTY A chowdhury A Department of Agricultural Chemistry and Soil Science Calcutta UniversityCalcutta Pin-700 019 IndiaDepartment of Agricultural Chemistry and Soil Science Calcutta UniversityCalcutta Pin-700 019 IndiaDepartment of Agronomy Bidhan Chandra Krishi Viswavidyalaya Mohanpur West BengalPin-741 252 IndiaDepartment of Agricultural Chemistry and Soil Science Calcutta UniversityCalcutta Pin-700 019 India

Pencycuron is a non-systemic protective fungicide for controlling sheath blight of rice. However, information on the fate of pencycuron in rice plant is lacking. The degradation of pencycuron in waterlogged tropic rice field was *** was applied at recommended field dose (187.5 g a.i./ha) and double recommended dose to cropped plots for three consecutive years. Pencycuron was rapidly degraded in rice plant at all doses of pencycuron application with first order half-lives of 1.57～2.77 d. The study revealed that pencycuron is safe from the human and environmental contamination point of view.

关键词： Pencycuron Dissipation Rice plant Sheath blight Rhizoctonia solani

Prediction of Weyl semimetal and antiferromagnetic topological insulator phases in Bi_(2)MnSe_(4)

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npj Computational Materials 2019年第1期5卷 867-873页

作者： Sugata chowdhury Kevin F.Garrity Francesca Tavazza Materials Measurement Laboratory National Institute for Standards and TechnologyGaithersburgMD 20899USA

Three-dimensional materials with strong spin–orbit coupling and magnetic interactions represent an opportunity to realize a variety of rare and potentially useful topological phases with broken time-reversal *** this work,we use first principles calculations to show that the recently synthesized material Bi_(2)MnSe_(4) displays a combination of spin–orbit-induced band inversion,also observed in non-magnetic topological insulator Bi2PbSe4,with magnetic interactions,leading to several topological *** bulk form,the ferromagnetic phase of Bi_(2)MnSe_(4) has symmetry protected band crossings at the Fermi level,leading to either a nodal line or Weyl semimetal,depending on the direction of the *** to the combination of time reversal symmetry plus a partial translation,the ground state layered antiferromagnetic phase is instead an antiferromagnetic topological *** surface of this phase intrinsically breaks time-reversal symmetry,allowing the observation of the half-integer quantum anomalous Hall ***,we show that in thin film form,for sufficiently thick slabs,Bi_(2)MnSe_(4) becomes a Chern insulator with a band gap of up to 58 *** combination of properties in a stoichiometric magnetic material makes Bi_(2)MnSe_(4) an excellent candidate for displaying robust topological behavior.

关键词： topological insulator symmetry

Biochar-mediated removal of pharmaceutical compounds from aqueous matrices via adsorption

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Waste Disposal and Sustainable Energy 2023年第1期5卷 37-62页

作者： Sahil Chauhan Tajamul Shafi Brajesh Kumar Dubey Shamik chowdhury School of Environmental Science and Engineering Indian Institute of Technology KharagpurKharagpurWest Bengal721302India Department of Civil Engineering Indian Institute of Technology KharagpurKharagpurWest Bengal721302India

Pharmaceutical is one of the noteworthy classes of emerging contaminants. These biologically active compounds pose a range of deleterious impacts on human health and the environment. This is attributed to their refractory behavior, poor biodegradability, and pseudopersistent nature. Their large-scale production by pharmaceutical industries and subsequent widespread utilization in hospitals, community health centers, and veterinary facilities, among others, have significantly increased the occurrence of pharmaceutical residues in various environmental compartments. Several technologies are currently being evaluated to eliminate pharmaceutical compounds (PCs) from aqueous environments. Among them, adsorption appears as the most viable treatment option because of its operational simplicity and low cost. Intensive research and development efforts are, therefore, currently underway to develop inexpensive adsorbents for the effective abatement of PCs. Although numerous adsorbents have been investigated for the removal of PCs in recent years, biochar-based adsorbents have garnered tremendous scientific attention to eliminate PCs from aqueous matrices because of their decent specific surface area, tunable surface chemistry, scalable production, and environmentally benign nature. This review, therefore, attempts to provide an overview of the latest progress in the application of biochar for the removal of PCs from wastewater. Additionally, the fundamental knowledge gaps in the domain knowledge are identified and novel strategic research guidelines are laid out to make further advances in this promising approach towards sustainable development.

关键词： Pharmaceuticals Adsorption Adsorbents Biochar Wastewater treatment