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Comparison between two tritrophic food chain models with multiple delays and anti-predation effect

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International Journal of Biomathematics 2021年第3期14卷 53-100页

作者： Debgopal Sahoo g.p.samanta Department of Mathematics Indian Institute of Engineering Science and Technology Shibpur Howrah-711103India

Exploring the predator prey linkage in food chain system is the most familiar research work in population ***,some research experiments show that predator-prey interaction not only governed by direct hunting but also influenced by some indirect effect such as fear effect(felt by prey)that may change the physiological behavior of *** upon this fact,we consider a tritrophic food chain model incorporating with anti-predation response(fear effect)and multiple time delays for biomass conversion from prey to middle predator and middle to top *** analyze the resulting delay differential equations and explore how the anti-predation response level affects the population *** also investigate the effect of delay parameters,for which the model system switches its stability through *** compare all of our results between two different food chain models consisting of two different functional *** numerical simulations are performed to validate the effectiveness of the derived theoretical results.

关键词： Food chain functional response anti-predation response digestion delay Hopf-bifurcation

Interplay between reproduction and age selective harvesting:A case study of Hilsa(Tenualosa ilisha)fish at Sundarban estuary of northern Bay of Bengal,India

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International Journal of Biomathematics 2019年第2期12卷 239-260页

作者： Debaldev Jana Sachinandan Dutta g.p.samanta Department of Mathematics&SRM Research Institute SRM Institute of Science and Technology Kattankulathur 603 203 Tamil NaduIndia Aquatic Bioresource Research Laboratory Department of Zoology University of Calcutta 35 Ballygunge Circular RoadKolkata 700 019India Department of Mathematics Indian Institute of Engineering Science and Technology Shibpur Howrah 711103India

New offspring due to sexual reproduction is not an instantaneous process from its birth,it takes time to be sexually *** the other hand,harvesting of commercially profitable fish population before the perfect size or weight is reached is not only a commercial loss but also risks the extinction of the ***,we discuss the issue of ganges-Brahmaputra-Meghna basin,northern Bay of Bengal for the age-selective harvesting of Hilsa shad(Tenualosa ilisha)which lays eggs after its sexual *** of hilsa before its sexual maturation risks its extinction and due to lamer body weight,it is not a commercially profitable *** is a reality of Sundarban estuary for hilsa fish harvesting,therefore,biologically and economically both India and Bangladesh are facing several *** data of Frasergunje Fishing Harbor shows a clear picture as the supporting document of this mathematical problem.

关键词： Maturation delay age selective harvesting extinction risk MSY bionomic equilibrium optimal harvesting

Biologics in the management of pediatric inflammatory bowel disease:When and what to choose

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World Journal of Clinical pediatrics 2025年第1期14卷 21-45页

作者： Arghya samanta Anshu Srivastava Department of pediatric gastroenterology Sanjay Gandhi Postgraduate Institute of Medical SciencesLucknow 226014Uttar PradeshIndia

pediatric inflammatory bowel disease(pIBD)is a chronic inflammatory disorder of the gastrointestinal tract,with rising global incidence and *** the past two decades,biologics have added to the therapeutic armamentarium and revolutionized the approach to treatment of inflammatory bowel *** available biologics include monoclonal antibodies which target inflammatory cytokines(anti-tumor necrosis factor alpha,anti-interleukin 12/23)or recruitment of leucocytes to the gastrointestinal tract(anti-alpha4beta7 integrin)and small molecules(Janus kinase inhibitors,sphingosine 1-phosphate-inhibitors)which modify the proinflammatory *** their potential disease-modifying ability,recent pediatric guidelines from the West have advocated upfront use of biologics in appropriate clinical scenarios as a top-down approach rather than the conventional step-up *** real-world studies are available regarding the clinical efficacy of biologics in pIBD,there is paucity of long-term outcome and safety data in ***,little information is available about the best approach in the newly industrialized-developing countries where pIBD is rising but at the same time,infections are prevalent and resources are *** this review,we summarize the efficacy and safety profile of biologics and small molecule drugs and discuss the challenges in the management of pIBD,especially in the developing world,and future directions.

关键词： Biologics Children Inflammatory bowel disease Therapeutic drug monitoring Dual biologic

Endoscopic techniques for the diagnosis of pancreatic cystic lesions

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World Journal of gastroenterology 2025年第1期31卷 1-7页

作者： Sahib Singh Saurabh Chandan Rakesh Vinayek Jahnvi Dhar Jayanta samanta gabriele Capurso Ivo Boskoski Cristiano Spada Jorge D Machicado Stefano Francesco Crinò Antonio Facciorusso Department of Internal Medicine Sinai HospitalBaltimoreMD 21215United States Division of gastroenterology and Hepatology Creighton University School of MedicineOmahaNE 68131United States Department of gastroenterology Sinai Hospital of BaltimoreBaltimoreMD 21215United States Department of gastroenterology Postgraduate Institute of Medical Education and ResearchChandigarh 160012India Division of pancreato-Biliary Endoscopy and Endosonography Pancreas Translational and Clinical Research CenterIRCCS San Raffaele Scientific InstituteVita-Salute San Raffaele UniversityMilano 20132Italy Digestive Endoscopy Unit Fondazione Policlinico Universitario Agostino Gemelli IRCSSUniversitàCattolica del Sacro Cuore di RomaCenter for Endoscopic Research Therapeutics and TrainingRoma 00168Italy Department of gastroenterology and Endoscopy Catholic UniversityRoma 00168Italy Department of gastroenterology University of Michigan HealthAnn ArborMI 48107United States Department of Endoscopy University of VeronaVerona 37121VenetoItaly gastroenterology Unit Department of Medical and Surgical SciencesUniversity of FoggiaFoggia 71122Italy

pancreatic cysts are mostly incidental findings on computed tomography or magnetic resonance imaging scans,with few patients presenting with abdominal pain or other *** accurate diagnosis of cysts is important as management depends on the type(neoplastic or non-neoplastic).Cross-sectional imaging is fast being replaced with endoscopic ultrasound(EUS)and various techniques based on that such as EUS-guided fine needle aspiration,EUS-guided needle confocal laser endomicroscopy,EUS-through-the-needle biopsy,and contrast-enhanced *** studies have reported varying diagnostic and adverse event rates with these *** addition,American,European,and Kyoto guidelines for the diagnosis and management of pancreatic cysts have provided different *** this editorial,we elaborate on the clinical guidelines,recent studies,and comparison of different endoscopic methods for the diagnosis of pancreatic cysts.

关键词： Endoscopic ultrasound Fine needle aspiration Needle confocal laser endomicroscopy Through-the-needle biopsy Contrast-enhanced endoscopic ultrasound

Analysis of a hand-foot-mouth disease model

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International Journal of Biomathematics 2017年第2期10卷 1-47页

作者： Swarnali Sharma g. p. samanta Department of MathematicsIndian Institute of Engineering Science and Technology Shibpur Howrah 711103 India

In this paper, we have introduced a six-compartmental epidemic model with hand, foot and mouth disease （HFMD） infection. The total population is divided into six subclasses, namely susceptible, exposed, infective in asymptomatic phase, infective in symptomatic phase, quarantined and recovered class. Some basic properties such as boundedness and non-negativity of solutions are discussed. The basic reproduction number （R0） of the system is obtained using next generation matrix method. Then the deterministic dynamical behaviors of the system are studied. Our study includes the existence and stability analysis of equilibrium points of the system. The sensitivity analysis of our system helps us to find out the parameters of greater interest. Next, we deal with the epidemic model with three controls （two treatment controls with quarantine control）. We show that there exists an optimal control, which is effective in controlling the disease outbreak in a cost effective way. Numerical simulation is presented with the help of MATLAB, which shows tile reliability of our model from the practical point of view.

关键词： Hand, foot and mouth disease (HFMD) infection basic reproduction number equilibrium points local and global stability optimal control.

parameter uncertainty in biomathematical model described by one-prey two-predator system with mutualism

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International Journal of Biomathematics 2017年第6期10卷 147-182页

作者： D. pal g. S. Mahapatra g. p. samanta Chandrahati Dilip Kumar High School (HS) Chandrahati 712504 West Bengal India Department of Mathematics National Institute of Technology-puducherry Karaikal 609605 India Department of Mathematics Indian Institute of Engineering Science and Technology Shibpur Howrah 711103 India

In this paper, a three-species system consisting of two predators which are in mutual- ism with each other and preying on the same single prey is considered. Also, the prey and first predator are harvested under optimal conditions. The values of the biological parameters depend on the collection of data from the experts as well as on the nature of the environment in which prey predator system are considered. So the biological para- meters are not precise in reality. This paper presents a different approach to study the prey-predator model with imprecise biological parameters. All the possible equilibrium points are identified and the local as well as global stability criteria under imprecise- ness are discussed. The possibility of existence of bionomic equilibrium is discussed. The optimal harvesting policy is studied using pontryagin＇s maximum principle. Numerical examples are provided to support the proposed approach.

关键词： Mutualism equilibrium stability bioeconomic optimal control intervalnumber.

gaAs-based resonant tunneling diode:Device aspects from design,manufacturing,characterization and applications

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Journal of Semiconductors 2023年第10期44卷 26-35页

作者： Swagata samanta Department of Electronics and Communication Engineering SRM University-APAndhra PradeshIndia

This review article discusses the development of gallium arsenide(gaAs)-based resonant tunneling diodes(RTD)since the *** the best of my knowledge,this article is the first review of gaAs RTD technology which covers different epitaxialstructure design,fabrication techniques,and characterizations for various application *** is expected that the details presented here will help the readers to gain a perspective on the previous accomplishments,as well as have an outlook on the current trends and future developments in gaAs RTD research.

关键词： gallium arsenide microfabrication resonant tunneling devices

Hybrid Approach to Document Anomaly Detection:An Application to Facilitate RpA in Title Insurance

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International Journal of Automation and computing 2021年第1期18卷 55-72页

作者： Abhijit guha Debabrata samanta Data Science Department CHRIST(Deemed to be University)Bangalore 560029India First American India private Ltd. Bangalore 560038India Computer Science Department CHRIST(Deemed to be University)Bangalore 560029India

Anomaly detection(AD)is an important aspect of various domains and title insurance(TI)is no *** process automation(RpA)is taking over manual tasks in TI business processes,but it has its limitations without the support of artificial intelligence(AI)and machine learning(ML).With increasing data dimensionality and in composite population scenarios,the complexity of detecting anomalies increases and AD in automated document management systems(ADMS)is the least explored *** learning,being the fastest maturing technology can be combined along with traditional anomaly detectors to facilitate and improve the RpAs in *** present a hybrid model for AD,using autoencoders(AE)and a one-class support vector machine(OSVM).In the present study,OSVM receives input features representing real-time documents from the TI business,orchestrated and with dimensions reduced by *** results obtained from multiple experiments are comparable with traditional methods and within a business acceptable range,regarding accuracy and performance.

关键词： Anomaly detection title insurance autoencoder one-class support vector machine(OSVM) term frequency-inverse document frequency(TF-IDF) robotic process automation dimensionality reduction

Response of testicular antioxidant enzymes to hexachlorocy clohexane is species specific

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Asian Journal of Andrology 2002年第3期4卷 191-194页

作者： Luna samanta g.B.N. Chainy Biochemistry Unit & ICABpS Department of Zoology Utkal University Bhubaneswar-751004 IndiaBiochemistry Unit & ICABPS Department of Zoology Utkal University Bhubaneswar-751004 India

Aim: To find out whether the response of testicular oxidative stress parameters to hexachlorocyclohexane (HCH) is species specific. Methods: In rats and mice (n=5 in each group), HCH was administered at a dose of 20 mg/kg/day intraperitoneally for 30 days in 0.1 ml of refined groundnut oil. The control groups received equal volume of the vehicle. Animals were sacrificed 24 hours after the last injection and various oxidative stress parameters were measured immediately. Results: The level of both endogenous as well as FeSO_4 and ascorbic acid-stimulated lipid peroxidation was increased significantly in the HCH-treated rats, whereas the pattern was just the reverse in case of mice. Although the level of H_2O_2 content increased in response to HCH in both groups, a totally different trend was observed for the activity of the principal H_2O_2-metabolising enzyme, catalase. In case of rats, a significant decline in the activity of catalase was recorded in response to HCH whereas a sharp augmentation in the enzyme activity was noticed in mice. Similarly, the decreased activity of superoxide dismutase observed in rats remained unaltered in mice. Conclusion: HCH induces oxidative stress in the testis of both rats and mice. However, the pattern of response of testicular oxidative stress parameters seems to be species specific.

关键词： hexachlorocyclohexane rat testes lipid peroxidation antioxidant defence