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Resistance and resilience of soil biological indicators:A case study with multi-walled carbon nanotube

Pedosphere 2024年第3期34卷 664-675页

作者： Shagufta YASMEEN Nintu MANDAL Anupam DAS pritam GANGULY Sanjay kumar Rajiv RAKSHIT Department of Soil Science and Agricultural Chemistry Bihar Agricultural UniversitySabourBhagalpur 813210(India) Department of Agronomy Bihar Agricultural UniversitySabourBhagalpur 813210(India)

Soil ecosystem is experiencing stresses due to climate change,and soil inhabitants try to demonstrate their inherent resistance and resilience against those *** of nanomaterials as agricultural inputs could bring shifts in resistance and resilience patterns of soil microbes and associated enzymes,especially under short-term heat *** this background,the impacts of multi-walled carbon nanotube(MWCNT)on the resistance and resilience of soil biological indicators were *** incubation experiment was conducted with varied MWCNT concentrations(0,50,100,250,and 500 mg kg-1soil)for 90 d after 24-h heat stress at 48±2?C to assess the impacts of MWCNT on soil enzyme activities and microbial populations vis-à-vis their resistance and resilience indices under short-term exposure to heat *** activities were reduced after exposure to heat *** indices of enzyme activities were enhanced by MWCNT application on day 1 after heat stress,whereas there was no recovery of enzyme activities after 90-d *** soil enzyme activities,resistance index values of soil microbial populations followed the similar trend and were improved by MWCNT ***-walled carbon nanotube has the potential to improve resistance indices of soil enzyme activities and microbial populations under heat stress,although they could not recover to their original state during periodical incubation after heat *** study helps to understand the relative changes of biological indicators under MWCNT and their ability to withstand heat stress.

关键词： enzyme activity heat stress microbial population nanomaterial recovery

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Structural and Electrical Characteristics of Ba(Fe0.5Nb0.5)O3-SrTiO3Ceramic System

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Materials Sciences and Applications 2011年第11期2卷 1593-1600页

作者： Narendra kumar Singh pritam kumar Ajay kumar Sharma Ram Naresh Prasad Choudhary 不详

A complex structure of barium iron niobate, Ba(Fe0.5Nb0.5)O3 (BFN) and strontium titanate SrTiO3 (ST) was fabricated by a solid-state reaction method. The phase formation of Ba(Fe0.5Nb0.5)O3-SrTiO3 was checked using X-ray diffraction (XRD) technique. The X-ray structural analysis of BFN and BFN-ST ceramics, showed the formation of single-phase compound in the monoclinic system, which is a distorted structure of an ideal cubic perovskite. Careful examination of microstructures of the individual compounds of the system was done by the scanning electron micrograph (SEM), and confirms the polycrystalline nature of the systems. Detailed studies of dielectric and electrical impedance properties of the systems in a wide range of frequency (100Hz - 5MHz) and different temperatures (30°C-285°C) showed that these properties are strongly dependent on temperature and frequency.

关键词： Dielectrics Perovskite Oxides X-Ray Diffraction Scanning Electron Micrograph

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Dielectric Relaxation in Complex Perovskite Oxide Sr(Gd0.5Nb0.5)O3

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Materials Sciences and Applications 2012年第6期3卷 369-376页

作者： pritam kumar Ajay kumar Sharma Bhrigunandan Prasad Singh Tripurari Prasad Sinha Narendra kumar Singh Department of Physics Bose Institute Kolkata India University Department of Physics T. M. Bhagalpur University Bhagalpur India University Department of Physics V. K. S. University Ara India

The complex perovskite oxide a strontium gadolinium niobate (SGN) synthesized by solid-state reaction technique has single phase with tetragonal structure. X-ray diffraction (XRD) technique and scanning electron microscopy (SEM) were used to study the structural and microstructural properties of the ceramics, respectively. The XRD patterns of SGN at room temperature show a tetragonal structure. Studies of the dielectric constant and dielectric loss of compound as a function of frequency (50 Hz to 1 MHz) at room temperature, and as a function of temperature (60°C to 420°C) indicate polydispersive nature of the material. The logarithmic angular frequency dependence of the loss peak is found to obey the Arrhenius law with activation energy ~0.18 eV. The small value of activation energy of the compound (~0.18 eV) can be explained by mixed ionic-polaronic conductivity mechanism. The grain size of the pellet sample was found to be 1.92 μm. The frequency-dependant electrical data are analyzed in the framework of conductivity and electric modulus formalisms. The complex plane impedance plot shows the grain boundary contribution for higher value of dielectric constant in the law frequency region.

关键词： Dielectrics Perovskite Oxides X-Ray Diffraction Scanning Electron Micrograph

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Phytochemical Screening and Evaluation of Pharmacological Potential of Baliospermum solanifolium Leaf Extract

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Clinical Complementary Medicine and Pharmacology 2024年第1期4卷 69-75页

作者： Amit Mazumder Rabindra Nath Acharyya Milton kumar Kundu pritam Kundu Md.Amirul Islam Md.Mustafizur Rahman Pharmacy Discipline Khulna UniversityKhulna-9208Bangladesh

Background:Baliospermum solanifolium is a traditional medicinal plant,locally known as“dantigaacha”from Eu-phorbiaceae family,and has been used in different diseases treatments likes helminthiasis,skin diseases,diabetes,snake-bite,and ***:Depending on the traditional uses of *** and the lack of scientific works,we aimed to conduct some pharmacological tests on its ***:Active constituents of *** were assessed by qualitative ***(2,2-diphenyl-1-picrylhydrazyl)was used for free radical scavenging *** change and mortality rate were used as indicators to assess the toxicity of *** antidiabetic potential was evaluated by oral glucose toler-ance test(OGTT)and alpha-glucosidase enzyme inhibitory *** antidiarrheal activity,castor oil-induced mice were *** test was carried out by disk diffusion assay and MIC ***,analgesic activity was done by acetic acid-induced writhing ***:*** contains alkaloids,carbohydrates,glycosides,flavonoids,tannis,phenolics *** toxicity test ensured the safety of the *** DPPH,the extract showed antioxidant activity with an IC50(con-centration needed to scavenge 50%DPPH)value of 61.65μg/*** phenolic,flavonoid and tannin contents were determined as 124 mg GAE/g,440 mg QE/g and 344 mg GAE/g dried extract,*** OGTT,the ex-tract reduced the blood glucose level *** the alpha-glucosidase inhibitory activity,the plant showed a concentration-dependent reduction of the enzyme at IC50 of 8.53 mg/*** the antidiarrheal test,*** inhibit defecation 30.69%and 53.41%at dose 250 mg/kg and 500 mg/kg,*** extract also showed antibacterial activity against four bacterial strains in the disk diffusion method and minimum inhibitory concen-tration(MIC)values were 62.5μg/mL,62.5μg/mL,125μg/mL and 62.5μg/mL against four bacterial strains,*** an

关键词： Baliospermum solanifolium Antioxidant Antidiabetic Antidiarrheal Antibacterial Analgesic

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微合金化和余热处理热轧带肋钢筋高低周疲劳性能对比研究

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钢铁钒钛 2015年第2期36卷 39-48页

作者： Surajit kumar Paul pritam kumar Rana Debdulal Das Sanjay Chandra Saurabh Kundu 杨雄飞 R & D Tata Steel Limited Department of Metallurgy and Materials Engineering Bengal Engineering and Science University

通过试验研究,对比分析了微合金化和余热处理带肋钢筋的高周疲劳和低周疲劳性能。研究表明,微合金化钢筋比余热处理钢筋具有更好的疲劳性能。在微合金化和余热处理带肋钢筋的高低周疲劳试验中,观察到在横肋根部裂纹萌生并沿该区域扩展... 详细信息

通过试验研究,对比分析了微合金化和余热处理带肋钢筋的高周疲劳和低周疲劳性能。研究表明,微合金化钢筋比余热处理钢筋具有更好的疲劳性能。在微合金化和余热处理带肋钢筋的高低周疲劳试验中,观察到在横肋根部裂纹萌生并沿该区域扩展。有限元模拟结果显示在横肋根部出现应力集中,应力三轴度变大。模拟过程中也发现在横肋根部拉应变累积。有限元模拟结果有助于解释试验观察结果,即疲劳裂纹沿热轧带肋钢筋的横肋根部萌生及扩展。

关键词：余热处理钢筋微合金化钢筋高周疲劳低周疲劳抗震性能应力集中应力三轴度横肋

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STUDIES OF STRUCTURAL AND ELECTRICAL BEHAVIOR OF SAMARIUM BARIUM TUNGSTATE CERAMICS

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Journal of Advanced Dielectrics 2011年第4期1卷 465-470页

作者： N.K.SINGH pritam kumar O.P.ROY R.N.P.CHOUDHARY Department of Physics V.K.S.University Ara 802301BiharIndia University Department of Physics B.R.A.Bihar University Muzaffarpur 842001 Bihar India Department of Physics&Meteorology Indian Institute of Technology Kharagpur 721302 West BengalIndia

Polycrystalline samples of samarium barium tungstate[Sm_(2)(Ba_(0.5)W_(0.5)T_(2)O_(7):(SBW)]pyrochlore structure type oxides have been prepared by a solid-state reaction technique.X-ray di®raction(XRD)patterns of this compound at room temperature suggest the formation of a single phase compound with orthorhombic *** of the dielectric constant and dielectric loss of compound as a function of frequency(4 kHz-1MHz)at room temperature,and as a function of temperature(23-350℃)at 20 and 50 kHz frequencies suggest that the compound does not have dielectric *** variation of dc resistivity suggests the semiconductor characteristics of the *** value of activation energy(E_(a)-0.43 at 20 kHz and E_(a)-0.29 at 50 kHz)of the above mentioned compound has been calculated from the slope of the ln-ac versus 1/T graph in the high temperature region(>240℃).The low value of activation energy supports the superionic nature of the compounds in the high temperature region.

关键词： Ceramics dielectric properties electrical conductivity

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Load shedding strategy coordinated with storage device and D-STATCOM to enhance the microgrid stability

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Protection and Control of Modern Power Systems 2019年第1期4卷 262-280页

作者： Sheetal Chandak pritam Bhowmik Pravat kumar Rout Electrical Engineering Department Siksha‘O’Anusandhan UniversityBhubaneswar751030India Electrical and Electronics Engineering Department Siksha‘O’Anusandhan UniversityBhubaneswar751030India

Recently microgrids have drawn a potential attraction by fulfilling the environmental demands and the increasing energy demands of the end-users. It is necessary to focus on various protection and control aspects of a microgrid. During the transition between the grid-following and grid-forming modes, the voltage and the frequency instability due to the power mismatch condition becomes the major point of concern. Therefore, the paper executes a frequency-active power and voltage-reactive power drooping control strategy for the precise power-sharing among the distributed power generators. Furthermore, to handle the power deficit scenarios and to maintain the system stability, a system independent and priority-based adaptive three-stage load shedding strategy is proposed. The sensitivity of the strategy depends on the system inertia and is computed according to the varying absolute rate-of-change-of-frequency. The strategy incorporates the operation of battery storage system and distributed static compensator (D-STATCOM) in the microgrid, to provide a reliable power supply to the customers for a considerable time instead of a sudden load shedding. The effectiveness of the proposed strategies is investigated on a scaled-down modified IEEE 13-bus microgrid system on the podium of MATLAB 2015b through the time-domain simulation.

关键词： Microgrid Power-sharing Load shedding High inertia distributed generators Inertia-less distributed generators Battery storage system D-STATCOM

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Clinical outcome of orbital apex syndrome in COVID associated mucormycosis patients in a tertiary care hospital

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International Journal of Ophthalmology(English edition) 2022年第4期15卷 527-532页

作者： Smiti Rani Srivastava Purban Ganguly Debasis Barman Sudip Das Manimoy Bandyopadhyay Asim kumar Ghosh Subhra Sarkar Amitabha Sengupta Sarbari Swaika pritam Chatterjee Amit kumar Gupta Alok Ranjan Mondal Soumyajit Guha Sinjita Dutta Souvik Adhikari Aditi Kaushik Partha Sundar Biswas Asif Ayub Department of Ophthalmology Institute of Post Graduate Medical Education and Research and Seth Sukhlal Karnani Memorial HospitalKolkata 999008India

AIM: To share clinical pattern of presentation, the modalities of surgical intervention and the one month postsurgical outcome of rhino-orbito-mucormycosis(ROCM) ***: All COVID associated mucormycosis(CAM) patients underwent comprehensive multidisciplinar y examination by ophthalmologist, otorhinolaryngologist and physician. Patients with clinical and radiological evidence of orbital apex involvement were included in the study. Appropriate medical and surgical intervention were done to each patient. Patients were followed up one-month post intervention. RESULTS: Out of 89 CAM patients, 31(34.8%) had orbital apex syndrome. Sixty-six(74.2%) of such patients had pre-existing diabetes mellitus, 18(58%) patients had prior documented use of steroid use, and 55(61.8%) had no light perception(LP) presenting vision. Blepharoptosis, proptosis, complete ophthalmoplegia were common clinical findings. Seventeen(19.1%) of such patients had variable amount of cavernous sinus involvement. Endoscopic debridement of paranasal sinuses and orbit with or without eyelid sparing limited orbital exenteration was done in most cases, 34(38.2%) patients could retain vision in the affected eye. CONCLUSION: Orbital apex involvement in CAM patients occur very fast. It not only leads to loss of vision but also sacrifice of the eyeball, orbital contents and eyelids. Early diagnosis and prompt intervention can preserve life, vision and spare mutilating surgeries.

关键词： rhino-orbito-cerebral mucormycosis COVID associated mucormycosis orbital exenteration endoscopic paranasal sinus debridement orbital apex syndrome

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Do we really need to repair the pronator quadratus after distal radius plating?

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Chinese Journal of Traumatology 2019年第6期22卷 345-349页

作者： Subodh Pathak Rashid Anjum Rakesh kumar Gautam pritam Maheshwari Jatin Aggarwal Aryan Sharma Vineet Pruthi Department of Orthopaedics Maharishi Markandeshwar Institute of Medical Sciences and ResearchMM(Deemed to be University)AmbalaHaryanaIndia Department of Orthopedics Pramukhswami Medical CollegeAnandCujaratIndia

Purpose:Fractures of distal radius are one of the common orthopaedic *** the plate on volar surface requires release of underlying pronator quadratus(PQ)*** consensus is present in the literature about the repair or not of the *** purpose of this study was to evaluate the influence of PQ repair on functional outcome and ***:Retrospectively 83 patients of distal radius fractures managed with volar plating between 2014 and 2016 were *** data,operative notes and physical therapy records were *** were divided into group A where PQ repair was done and group B where no repair was *** data such as range of motion(ROM),grip strength,visual analogue scale(VAS)score and disabilities of arm,shoulder and hand(DASH)score at 4 weeks,3 months,6 months and finial follow-up were ***:Totally 63 patients(n=29 in group A and n=34 in group B)with the mean age of 51.64 years were *** were followed up for a mean of 35.2 months(range 27.2-47.1 months)in group A and 38.6 months(range 28.6-51.0 months)in group *** functional outcome of the affected limb was not significantly different between two groups after 3 months,PQ repair did affect the recovery at an early *** group had significantly better ROM(p=0.0383)and VAS score at 4 weeks(p=0.017)while grip strength(p=0.014)was significantly better at 3 ***:Repair of PQ may provide pain relief and increased ROM in early postoperative period and hence every attempt should be made to achieve the repair.

关键词： Distal radius fractures Disabilities of arm,shoulder and hand Volar plate Pronator quadratus Grip strength

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Multiple facets of poly(ADP-ribose) polymerase-1 in neurological diseases

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Neural Regeneration Research 2015年第1期10卷 49-51页

作者： Chandra Shaker Sriram Ashok Jangra Rajaram Mohanrao Madhana Satendra Singh Gurjar pritam Mohan Babul kumar Bezbaruah Department of Pharmacology & Toxicology National Institute of Pharmaceutical Education & Research (NIPER)GuwahatiAssam-781032 India Department of Biotechnology National Institute of Pharmaceutical Education and Research (NIPER)Guwahati Assam-781032 India Department of Pharmacology College of Veterinary Sciences AAU Khanapra Guwahati Assam-781022 India Department of Pharmacology Gauhati Medical CollegeGuwahatiAssam-781032India

The highly conserved abundant nuclear protein poly （ADP-ribose） polymerase-1 （PARP-1） is activated by DNA damage. PARP-1 activation is associated in DNA repair, cell death and inflammation. Since oxidative stress induced robust DNA damage and wide spread inflamma- tory responses are common pathologies of various CNS diseases, the attention towards PARP-1 as a therapeutic target has been amplifying. This review highlights the multiple roles of PARP- 1 in neurological diseases and po- tential of PARP- 1 inhibitors to enter clinical translation.

关键词： PARP Multiple facets of poly polymerase-1 in neurological diseases ADP-ribose

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