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Effect of calcium lactate on compressive strength and self-healing of cracks in microbial concrete

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Frontiers of Structural and Civil Engineering 2019年第3期13卷 515-525页

作者： Kunamineni VIJAY Meena murmu Department of Civil Engineering National Institute of TechnologyRaipur 492010India

This paper presents the effect on compressive strength and self-healing capability of bacterial concrete with the addition of calcium *** to normal concrete,bacterial concrete possesses higher durability and engineering concrete *** production of calcium carbonate in bacterial concrete is limited to the calcium content in *** calcium lactate is externally added to be an additional source of calcium in the *** influence of this addition on compressive strength,self-healing capability of cracks is highlighted in this *** bacterium used in the study is bacillus subtilis and was added to both spore powder form and culture form to the *** subtilis spore powder of 2 million cfu/g concentration with 0.5%cement was mixed to *** lactates with concentrations of 0.5%,1.0%,1.5%,2.0%,and 2.5%of cement,was added to the concrete mixes to test the effect on properties of *** other samples,cultured bacillus subtilis with a concentration of 1×10^cells/mL was mixed with concrete,to study the effect of bacteria in the cultured form on the properties of *** of 100 mm×100 mm×100 mm were used for the *** cubes were tested after a curing period of 7,14,and 28 d.A maximum of 12%increase in compressive strength was observed with the addition of 0.5%of calcium lactate in *** electron microscope and energy dispersive X-ray spectroscopy examination showed the formation of ettringite in pores;calcium silicate hydrates and calcite which made the concrete denser.A statistical technique was applied to analyze the experimental data of the compressive strengths of cementations *** surface methodology was adopted for optimizing the experimental *** regression equation was yielded by the application of response surface methodology relating response variables to input *** method aids in predicting the experimental results accurately with an acceptable range

关键词： calcium lactate bacillus subtilis compressive strength self-healing of cracks

An account of the strategies to enhance the water splitting efficiency of noble-metal-free electrocatalysts

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Journal of Energy Chemistry 2021年第8期30卷 160-190,I0005页

作者： Subhasis Shit Saikat Bolar Naresh Chandra murmu Tapas Kuila Surface Engineering&Tribology Division Council of Scientific and Industrial Research-Central Mechanical Engineering Research InstituteMahatma Gandhi AvenueDurgapur 713209India Academy of Scientific and Innovative Research(AcSIR) CSIR-Human Resource Development Centre(CSIR-HRDC)CampusPostal Staff College AreaSector 19Kamla Nehru NagarGhaziabad 201002India

The electrolysis of water for hydrogen generation has shown immense promise as an energy conversion technology for the green energy *** concurrently occurring electrochemical reactions in water electrolysis(hydrogen and oxygen evolution reactions)are sluggish in nature and therefore the employment of electrocatalysts is highly ***-metal-based electrocatalysts(Pt,Ru O_(2),Ir O_(2),etc.)have shown superior activity towards these ***,their lower natural abundance and inferior stability make the cost to performance ratio of water electrolysis too ***,huge amount of research efforts are being carried out to develop electrocatalysts consisting of earth abundant elements(transition metals,carbon etc.)as the replacement of these noble-metal-based *** metal compounds,carbonaceous and hybrid materials have shown promise as efficient electrocatalysts but there is still huge gap between the activities of these materials and the noble-metal-based *** strategies like morphology modulation,elemental doping,defect engineering *** being deployed to enhance the activity of these noble-metal-free *** review summarizes these strategies and thoroughly discusses the reason behind the changes in activity of the electrocatalysts owing to these ***,the remaining research gaps and future prospects in this field are also discussed in detail.

关键词： Water splitting Electrocatalyst Morphology Doping Defect engineering Phase engineering

Freeze–dried synthesized bifunctional biopolymer nanocomposite for efficient fluoride removal and antibacterial activity

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Journal of Environmental Sciences 2020年第8期32卷 52-63页

作者： Sapna Nehra ankita Dhillon Dinesh Kumar Department of Chemistry Banasthali VidyapithBanasthaliRajasthan 304022India School of Chemical Sciences Central University of GujaratGandhinagar 382030India

Local fluoride contamination and bacterial infections in potable water have dangerous effects on the human body and are today a global *** this study,we have synthesized a pH-responsive bifunctional biopolymer nanocomposite(HAZ)of humic acid with incorporating aluminum zirconium bimetallic oxide by deep freeze–drying *** nucleation and interconnection of nanoparticles form a highly porous network because of sublimation of frozen *** duo nanocomposite has efficiently worked for fluoride removal and showed potent antibacterial activity against the Escherichia coli Gram-negative and Staphylococcus aureus Gram-positive *** X-ray photoelectron spectroscopy(XPS)analysis demonstrates that the hydroxyl groups act as a pivot in the ion exchange process of adsorption,each element of bimetallic oxide primarily takes part in the adsorption *** maximum adsorption capacity of the adsorbent was 180.62 mg/g at pH *** parameters like Gibbs free energy change(△G0),entropy(△S0),and enthalpy(△H0)indicate that the process was endothermic,feasible,and taken place by a chemisorption *** is the first novel freeze–dried bifunctional biopolymer nanocomposite composed of humic acid natural polymer incorporated with Al–Zr metal oxide,and it exhibited three times higher adsorption efficacy with excellent antibacterial action at a concentration of 5μg/mL of the nanocomposite.

关键词： Bifunctional Disinfection Freeze–dried Langmuir Spontaneous

Insight into solute-solute and solute-solvent interactions of semicarbazide hydrochloride in water and D-glucose/D-sucrose+water solutions at temperatures(293.15 to 318.15)K

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Chinese Journal of Chemical Engineering 2020年第12期28卷 3086-3095页

作者： ankita Dinesh Chand Anil Kumar Nain Department of Chemistry Dyal Singh CollegeUniversity of DelhiNew Delhi 110003India Department of Chemistry University of DelhiDelhi 110007India Department of Chemistry Amity University Dubai CampusDubai International Academic CityDubaiUAE

The solute-solute and solute-solvent interactions of drug semicarbazide hydrochloride with carbohydrates(Dglucose/D-sucrose)are investigated by using volumetric,viscometric and acoustic *** measurements of the densitiesρ,ultrasonic speeds u,and viscositiesη.of semicarbazide hydrochloride in 5% and 10%D-glucose/D-sucrose+water(w/w)solutions were carried out at temperatures(293.15-318.15)K and at pressure,p=101 *** apparent molar volumes,Vϕ,limiting apparent molar volumes,V°ϕ,apparent molar compressibilities,Ks,ϕ,limiting apparent molar compressibilities,K°s;ϕ,partial molar expansibilities,E°ϕ,transfer volumes,V°ϕ;tr and transfer compressibilities,K°s;ϕ;tr have been calculated from the experimental *** viscosity data were examined by using the Jones-Dole equation and the viscosity A and B coefficients were *** results are discussed in terms of solute-solute and solute-solvent interactions in these *** structure making/breaking ability of semicarbazide hydrochloride is examined using the sign of temperature derivative of Bcoefficient,dB/dT.

关键词： Density Ultrasonic speed Viscosity Semicarbazide hydrochloride Carbohydrates Solute-solvent interactions

Trust-based co-operative routing for secure communication in mobile ad hoc networks

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Digital Communications and Networks 2024年第4期10卷 1079-1087页

作者： ankita A.Mahamune M.M.Chandane Dept.of Comp.Engg.&Information Tech. Veermata Jijabai Technological InstituteMumbaiMaharashtra StateIndia

The working of a Mobile Ad hoc NETwork(MANET)relies on the supportive cooperation among the network *** due to its intrinsic features,a misbehaving node can easily lead to a routing *** paper presents two trust-based routing schemes,namely Trust-based Self-Detection Routing(TSDR)and Trust-based Cooperative Routing(TCOR)designed with an Ad hoc On-demand Distance Vector(AODV)*** proposed work covers a wide range of security challenges,including malicious node identification and prevention,accurate trust quantification,secure trust data sharing,and trusted route *** brings a prominent solution for mitigating misbehaving nodes and establishing efficient communication in *** is empirically validated based on a performance comparison with the current Evolutionary Self-Cooperative Trust(ESCT)scheme,Generalized Trust Model(GTM),and the conventional AODV *** extensive simulations are conducted against three different varying network *** results affirm the improved values of eight popular performance metrics overcoming the existing routing *** the two proposed works,TCOR is more suitable for highly scalable networks;TSDR suits,however,the MANET application better with its small *** work thus makes a significant contribution to the research community,in contrast to many previous works focusing solely on specific security aspects,and results in a trade-off in the expected values of evaluation parameters and asserts their efficiency.

关键词： Mobile Ad hoc NETwork Secure communication AODV Co-operative routing Trust metric

cis-trans Engineering： Advances and Perspectives on Customized Transcriptional Regulation in Plants

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Molecular Plant 2018年第7期11卷 886-898页

作者： ankita Shrestha Ahamed Khan Nrisingha Dey Division of Microbial and Plant Biotechnology Institute of Life Sciences Department of Biotechnology Government of India Chandrasekharpur Bhubaneswar Odisha India These authors contributed equally to this article.

Coordinated transcriptional control employing synthetic promoters and transcription factors （TFs） can be used to achieve customized regulation of gene expression in planta. Synthetic promoter technology has yielded a series of promoters with modified cis-regulatory elements that provide useful tools for efficient modulation of gene expression. In addition, the use of zinc fingers （ZFs）, transcription activator-like effectors （TALEs）, and catalytically inactive clustered regularly interspaced short palindromic repeats （CRISPR）-associated protein 9 （dCas9） has made it feasible to engineer TFs that can produce targeted gene expression regulation; these approaches are particularly effective when artificial TFs are coupled with transcriptional activators or repressors. This review focuses on strategies used to engineer both promoters and TFs in the context of targeted transcriptional regulation. We also discuss the creation of synthetic inducible platforms, which can be used to impart stress tolerance to plants. We propose that combinatorial ＂cis-trans engineering＂ using a CRISPR-dCas9-based bipartite module could be used to regulate the expression of multiple target genes. This approach provides an attractive tool for introduction of specific qualitative traits into plants, thus enhancing their overall environmental adaptability.

关键词： cis engineering trans engineering synthetic TFs dCas9 bipartite module

Biomineralized and chemically synthesized magnetic nanoparticles:A contrast

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Frontiers of Materials Science 2020年第4期14卷 387-401页

作者： Tanya NANDA ankita RATHORE Deepika SHARMA Present adress:School of Biological and Health Systems Engineering Ira A.Fulton Schools of EngineeringArizona State UniversityTempeAZ 85281USA Present address:Academy of Scientific and Innovative Research(AcSir) CSIR-National Institute of Science Communication and Information Resources(NISCAIR)New Delhi 110067India Institute of Nano Science and Technology Habitat CentreSector 64Mohali 160062India

Magnetic nanoparticles(MNPS)have widely been synthesized through chemical processes for biomedical applications over the past few ***,a new class of MNPs,known as bacterial magnetosomes,has been isolated from magnetotactic bacteria,a natural *** magnetosomes are magnetite or greigite nanocrystals which are biomineralized in the bacterial cell and provide magnet-like properties to *** to MNPs,bacterial magnetosomes are biocompatible,lower in toxicity,and can be easily cleared from the body due to the presence of a phospholipid bilayer around *** also do not demonstrate aggregation,which makes them highly *** this review,we have provided an in-depth comparative account of bacterial magnetosomes and chemically synthesized MNPs in terms of their synthesis,properties,and biomedical *** addition,we have also provided a contrast on how magnetosomes might have the potential to successfully substitute synthetic MNPs in therapeutic and imaging applications.

关键词： bacterial magnetosomes magnetic nanoparticles iron nanoparticles magnetotactic bacteria magnetosomes

A strategic way of high-performance energy storage device development with environmentally viable “Water-in-salt” electrolytes

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Journal of Energy Chemistry 2023年第3期78卷 350-373,I0010页

作者： Prakas Samanta Souvik Ghosh Aniruddha Kundu Pranab Samanta Naresh Chandra murmu Tapas Kuila Surface Engineering&Tribology Division Council of Scientific and Industrial Research Central Mechanical Engineering Research InstituteMahatma Gandhi AvenueDurgapur-713209West BengalIndia Academy of Scientific and Innovative Research(AcSIR) CSIR-Human Resource Development Centre(CSIR-HRDC)CampusPostal Staff College AreaSector 19Kamla Nehru NagarGhaziabad-201002Uttar PradeshIndia

Development of cost-effective and environmental friendly energy storage devices(ESDs) has attracted widespread attention in recent scenario of energy ***,the environmentally viable "water-in-salt"(WiS) electrolytes has received significant interest for the development of advanced high performance *** WiS electrolyte exhibits wide electrochemical stability window(ESW),highsafety,non-flammability and superior electrochemical performance compared to the conventional "salt-in-water" *** review aims to provide a comprehensive discussion on WiS electrolyte based on theoretical,electrochemical and physicochemical characteristics.A strategic way for the usage of WiS electrolyte in rechargeable metal-ion batteries and supercapacitors with potentially improved electrochemical performance has been reviewed *** review also discussed the unique advantages of WiS electrolytes as well as the future scope and challenges.

关键词： Water-in-salt electrolyte Solid electrolyte interphase High energy density Aqueous batteries Aqueous supercapacitors

Discovery of Early Tonian Calc-alkaline and Shoshonitic Metamafic Rocks from the North Purulia Shear Zone,Chhotanagpur Gneissic Complex,Eastern India:Implications of Proterozoic Sub-continental Lithospheric Mantle

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Acta Geologica Sinica(English Edition) 2023年第1期97卷 68-89页

作者： Bapi GOSWAMI Susmita DAS ankita BASAK Chitta BHATTACHARYYA University of Calcutta 35 Ballygunge Circular RoadKolkata 700019India

Reports of shoshonitic rocks in Precambrian terrains are relatively ***-Grt amphibolites and Hbl-Bt mafic granulites occurring in the migmatitic gneisses of the Chhotanagpur Gneissic Complex(CGC)show calc-alkaline and shoshonitic *** porphyritic,sub-ophitic and poikilitic textures are noted in these *** parent magma was emplaced during the waning phase of the regional ***,these metamafics are similar to the GroupⅢpotassic and ultrapotassic rocks of Foley et al.(1987).The magma was derived from the metasomatized subcontinental lithospheric mantle(SCLM).Subduction-related sediment melts metasomatized the ***,the SCLM is a metasomatized phlogopite-amphibole-spinel-bearing harzburgite.1%–5%batch melting of the SCLM could produce the parental magma of the mafic *** and temperatures of metamorphic equilibration were carried out by pseudosection *** metamorphic assemblage(M_(1):Grt-Cpx-Pl-Qz)in garnetiferous amphibolite equilibrated at 740℃and 8.7 *** Cpx-Pl corona appeared around the garnet during decompression(M_(2):655℃,6 kbar).The Hbl-Pl symplectites around garnet formed during isobaric cooling(M_(3):580℃and 5.9 kbar).The emplacement of shoshonitic magma and subsequent decompression happened at the slab break-off stage of continental collision(~990 Ma).

关键词： calc-alkaline-shoshonitic magma amphibolite-granulite facies metamorphism post-collisional early Tonian eastern Indian Shield sub-continental lithospheric mantle