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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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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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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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Impact of density of coating agent on antibacterial activity of silver nanoparticle impregnated plasma treated activated carbon

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Journal of Environmental Sciences 2018年第5期30卷 136-144页

作者： pritam Biswas Rajdip BANDyopadhyaya Department of Chemical Engineering Indian Institute of Technology Bombay

To use stabilized nanoparticles（NPs） in water as disinfectants over a very long period, the amount of coating agent（for NP stabilization） needs to be optimized. To this end, silver nanoparticles（Ag-NPs） with two different coating densities of tri-sodium citrate（12.05 and46.17 molecules/nm2, respectively）, yet of very similar particle size（29 and 27 nm, respectively）were synthesized. Both sets of citrate capped NPs were then separately impregnated on plasma treated activated carbon（AC）, with similar Ag loading of 0.8 and 0.82 wt.%, respectively. On passing contaminated water（containing 10~4 CFU Escherichia coli/m L of water） through a continuous flow-column packed with Ag/AC, zero cell concentration was achieved in 22 and 39 min, with Ag-NPs（impregnated on AC, named as Ag/AC） having lower and higher coating density, respectively. Therefore, even on ensuring similar Ag-NP size and loading, there is a significant difference in antibacterial performance based on citrate coating density in Ag/*** is observed in lower coating density case, due to both：（i） higher Ag~＋ ion release from Ag-NP and（ii） stronger binding of individual Ag-NPs on AC. The latter ensures that, Ag-NP does not detach from the AC surface for a long duration. TGA-DSC shows that Ag-NPs with a low coating density bind to AC with 4.55 times higher adsorption energy, compared to Ag/AC with a high coating density, implying stronger binding. Therefore, coating density is an important parameter for achieving higher antibacterial efficacy, translating into a faster decontamination rate in experiments, over a long period of flow-column operation.

关键词： Silver nanoparticles Activated carbon Escherichia coliCitrate coating Coating density Water disinfection

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Numerical Study on the Behaviour of Hybrid FRPs Reinforced RC Slabs Subjected to Blast Loads

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Journal of Renewable Materials 2023年第9期11卷 3517-3531页

作者： Mahdi Hosseini Bingyu Jian Jian Zhang Haitao Li Rodolfo Lorenzo Ahmad Hosseini pritam Ghosh Feng Shen Dong Yang Ziang Wang College of Civil Engineering Nanjing Forestry UniversityNanjing210037China Joint International Research Laboratory for Bio-Composite Building Materials and Structures Nanjing Forestry UniversityNanjing210037China Nantong Shirui Reinforced Plastic Products Co. Ltd.Nantong226002China University College London LondonWC1E 6BTUK Fiber Composite Laboratory Hindustan Institute of Technology and ScienceChennai603103India Jiangsu Fiber Composite Co. Ltd.Yancheng224700China

The safety of civilian and military infrastructure is a concern due to an increase in explosive risks,which has led to a demand for high-strength civil infrastructure with improved energy absorption *** this study,a Finite Element(FE)numerical model was developed to determine the effect of hybrid Fibre Reinforced Polymer(FRP)as a strengthening material on full-scale Reinforced Concrete(RC)*** reinforcing materials under consideration were Carbon(CFRP)and Glass(GFRP)fibres,which were subjected to blast loads to determine the structural response.A laminated composite fabric material model was utilized to model the failure of composite,which facilitates the consideration of strain rate *** damaged area of the laminate is determined in the FE model,and it is in good agreement with the corresponding experimental results in the *** containing different stacking sequences were built to demonstrate their efficiency in resisting blast *** general,the damaged area was reduced when a hybrid reinforcement with CFRP as the top layer was used.

关键词： Composite damage blast load CFRP GFRP finite element analysis on LS-DYNA

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Remediation of Fly Ash Dumpsites Through Bioenergy Crop Plantation and Generation: A Review

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Pedosphere 2018年第4期28卷 561-580页

作者： Madhumita ROY Roopali ROYCHOWDHURY pritam MUKHERJEE Department of Biotechnology Techno India University

Utilization of fly ash, a byproduct of coal combustion in thermal power plants, is a sustainable use of waste for power *** fly ash as waste in landfills/ash ponds may not only be regarded as a loss of valuable land and essential nutrients, but also pose a significant health hazard due to fine air-borne particles and leaching of heavy metals. The presence of essential macro-and micronutrients and its porosity make fly ash an excellent soil amendment for plant growth as an organic nitrogen(N) and carbon(C)supplementation. As harmful heavy metals make fly ash unsafe for agronomy, bioenergy crop plantation and energy generation from different thermochemical conversions of the biomass would be an ideal method for coal fly ash utilization through which carbon-neutral fuel can be generated from fossil fuel, thus reducing climate change impact. This review summarizes the development of bioenergy plantation and silviculture at fly ash dumpsites with an integrated phyto-bio-rhizo-mycoremediation approach and assesses utilization of the valuable biomass for thermal energy, electricity, and biofuel generation with inclusion of a SWOT analysis(a strategic technique typically used to help identify the strength, weakness, opportunities, and threat). Bioenergy crop production through integrated phytomanagement can generate billions of dollars of wealth from waste and provides a sustainable solution for fly ash management,with environmental, economic, and social benefits.

关键词：种植园苍蝇庄稼评论有害重金属气候变化影响生物资源健康危险

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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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Jeans Instability of Self Gravitating Dust Cloud in Presence of Effective Electrostatic Pressure

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Communications in Theoretical Physics 2018年第8期69卷 209-214页

作者： Pratikshya Bezbaruah pritam Das Prathana Borah Nilakshi Das Department of Physics Tezpur University

The role of viscosity coefficient(η′), coulomb coupling parameter(Γ) and dust mass on the growth of jeans mode is investigated in strongly coupled dusty plasma using equations of Generalized Hydrodynamics(GH) Model. The novel aspect of this work is that the force arising due to electrostatic pressure caused by grain grain interaction has been included in the dynamics of dust particles. This force is found to play a significant role in counter balancing the self gravity effect, thereby reducing the growth rate of jeans instability. The present work may provide more physical insight in understanding the mechanisms behind formation of planetesimals, stars etc.

关键词：灰尘粒子不稳定性牛仔裤压力静电移动水动力学粘性系数

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State of Research and Trends in the Development of Polyvinyl Acetate-Based Wood Adhesive

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Open Journal of Polymer Chemistry 2022年第1期12卷 13-42页

作者： Ravindra Vilas Indubai Gadhave pritam V. Dhawale Department of Polymer and Surface Engineering Institute of Chemical Technology Mumbai India

Synthetic wood adhesives, consisting of urea-formaldehyde resins (UF), phenol-formaldehyde resins (PF), melamine-formaldehyde resins (MF), and polyurethane resins, are widely used. For UF and MF, most investigations are concerned with reducing free formaldehyde content;for PF, most studies focused on finding new alternative chemicals to replace phenol. These adhesives come under the Carcinogenic, Mutagenic, and Reprotoxic chemicals (CMR) category. Due to global energy issues and dependency on petroleum sources, the focus has shifted to look for alternative and renewable raw material sources for wood adhesives. Conventionally available wood adhesives are polyvinyl alcohol (PVA) stabilized, with drawbacks like poor water resistance, poor heat resistance, low-temperature workability, and it’s based on petroleum resources. Polyvinyl acetate (PVAc) is non-resistant to moisture polymer, and if such adhesive joints are exploited in a moist environment, its strength substantially decreases. Sufficiently moisture-resistant adhesive joints are obtained by modifying PVAc dispersion with special compounds like reactive comonomer, Silanes, and modified PVA. To improve the workability at low temperature, Vinyl acetate (VAc) is copolymerized with specific comonomers like butyl acetate without affecting the performance properties. Here, we aim to present an overview of the research trend of PVAc-based adhesives in the wood industry. The review summarizes the current state of research PVAc-based adhesives.

关键词： Polyvinyl Acetate Emulsion Polyvinyl Alcohol Bio-Polymers Wood Water Resistance Adhesives

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Facile Development of Iron-Platinum Nanoparticles to Harness Multifunctionality in Single Entity

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Acta Metallurgica Sinica(English Letters) 2016年第12期29卷 1098-1106页

作者： Madhulekha Gogoi Komanduri S. Varadarajan Anant Bahadur Patel pritam Deb Department of Physics Tezpur University (Central University) Tezpur Assam 784028 India NMR Microimaging and Spectroscopy Centre for Cellularand Molecular Biology Habsiguda Hyderabad 500007 India Department of Chemistry IIT GuwahatiNorth Guwahati Assam 781039 India

Engineered magnetic nanosystems exhibit attractive options for implementing unique diagnostic options and therapeutic solutions in biomedical applications. Here we report a facile, thermo-free and aqueous synthetic method to prepare ascorbic acid-stabilized iron-platinum nanoparticles. The effects of reducing agent, pH and sequence of precursor addition are investigated, and optimized reaction condition is identified to obtain a unique iron-platinum （Pt-FePt） nanosystems. The multifunctionality of the developed nanosystem has been realized by catalytic efficiency of platinum for therapeutic application and superparamagnetic property of FePt for magnetic resonance imaging contrast enhancement. Moreover, the multifunctional imaging and therapeutic activities have been achieved at physiological pH. The developed multifunctional nanoparticles are monodisperse with uniform morphology as well as stable in solution and non-toxic.

关键词： Multifunctional Superparamagnetic Magnetic resonance imaging (MRI) Therapeutic

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