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Binding interaction of phosphorus heterocycles with bovine serum albumin:A biochemical study

Journal of Pharmaceutical Analysis 2017年第1期7卷 19-26页

作者： Swarup Roy Raj kumar Nandi Sintu Ganai k.c. Majumdar Tapan k. Das Department of Biochemistry and Biophysics University of Kalyani Kalyani 741235 West Bengal India Department of chemistry University of Kalyani Kalyani 741235 West Bengal India

Interaction between bovine serum albumin(BSA) and phosphorus heterocycles(PHs) was studied using multispectroscopic techniques. The results indicated the high binding affinity of PHs to BSA as it quenches the intrinsic fluorescence of BSA. The experimental data suggested the fluorescence quenching mechanism between PHs and BSA as a dynamic quenching. From the UV–vis studies, the apparent association constant(k_(app)) was found to be 9.25×10~2, 1.27×10~4and 9.01×10~2L/mol for the interaction of BSA with PH-1, PH-2 and PH-3,respectively. According to the F?rster's non-radiation energy transfer(FRET) theory, the binding distances between BSA and PHs were calculated. The binding distances(r) of PH-1, PH-2 and PH-3 were found to be2.86, 3.03, and 5.12 nm, respectively, indicating energy transfer occurs between BSA and PHs. The binding constants of the PHs obtained from the fluorescence quenching data were found to be decreased with increase of temperature. The negative values of the thermodynamic parameters ΔH, ΔS and ΔG at different temperatures revealed that the binding process is spontaneous; hydrogen bonds and van der Waals interaction were the main force to stabilize the complex. The microenvironment of the protein-binding site was studied by synchronous fluorescence and circular dichroism(cD) techniques and data indicated that the conformation of BSA changed in the presence of PHs. Finally, we studied the BSA-PHs docking using Auto Dock and results suggest that PHs is located in the cleft between the domains of BSA.

关键词： BSA Spectroscopy Phosphorus heterocycles BSA-PHs docking

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Dynamics of Entanglement in Qubit-Qutrit with x-component of DM Interaction

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communications in Theoretical Physics 2016年第3期65卷 278-284页

作者： kapil k.Sharma S.N.Pandey Department of Physics Motilal Nehru National Institute of Technology

In this present paper,we study the entanglement dynamics in qubit A-qutrit B pair under x component of Dzyaloshinshkii-Moriya interaction(D_x)by taking an auxiliary qubit ***,we consider an entangled qubit-qutrit pair initially prepared in two parameter qubit-qutrit states and one auxiliary qubit prepared in pure state interacts with the qutrit of the pair through DM *** trace away the auxiliary qubit and calculate the reduced dynamics in qubit A-qutrit B pair to study the influence of the state of auxiliary qubit c and D_x on *** find that the state(probability amplitude)of auxiliary qubit does not influence the entanglement,only D_x influences the *** phenomenon of entanglement sudden death(ESD)induced by D_x has also been *** also present the affected and unaffected two parameter qubit-qutrit states by D_x.

关键词： entanglement dynamics qubit-qutrit DM interaction ESD

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Numerical simulation and experimental validation of arc welding of DMR-249A steel

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Defence Technology（防务技术） 2016年第4期12卷 305-315页

作者： Rishi PAMNANI M. VASUDEVAN T. JAYAkUMAR R VASANTHARAJA k.c. GANESH Prototype Training centre Kalpakkam Tamil Nadu 603 127 India IGcAR Tamil Nadu 603 102 India Metallurgical and Materials Engg Dept NIT Warangal 506 004 India Dept of Mech Engg NITT Tiruchirappalli 620 015 India

The thermo-mechanical attributes of DMR-249 A steel weld joints manufactured by shielded metal arc welding(SMAW) and activated gas tungsten arc welding(A-GTAW) processes were studied using Finite Element Model(FEM) simulation. The thermal gradients and residual stresses were analyzed with SYSWELD software using double ellipsoidal heat source distribution model. The numerically estimated temperature distribution was validated with online temperature measurements using thermocouples. The predicted residual stresses profile across the weld joints was compared with the values experimentally measured using non-destructive techniques. The measured and predicted thermal cycles and residual stress profile was observed to be comparable. The residual stress developed in double sided A-GTAW joint were marginally higher in comparison to five pass SMAW joint due to phase transformation associated with high heat input per weld pass for A-GTAW process. The present investigations suggest the applicability of numerical modeling as an effective approach for predicting the thermo-mechanical properties influenced by welding techniques for DMR-249 A steel weld joints. The tensile, impact and micro-hardness tests were carried to compare the *** benefits of high productivity and savings of labor and cost associated with A-GTAW compared to SMAW process, the minor variation in residual stress build up of A-GTAW joint can be neglected to develop A-GTAW as qualified alternative welding technique for DMR-249 A steel.? 2016 china Ordnance Society. Production and hosting by Elsevier B.V. All rights reserved.

关键词： DMR-249A A-GTAW SMAW FEM SYSWELD Thermo-mechanical Simulation

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cUTIN SYNTHASE 2 Maintains Progressively Developing cuticular Ridges in Arabidopsis Sepals

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Molecular Plant 2017年第4期10卷 560-574页

作者： Lilan Hong Joel Brown Nicholas A. Segerson Jocelyn k.c. Rose Adrienne H.k. Roeder Weiil institute for ceil and Molecular Biology Cornell University Ithaca NY 14853 USA Plant Biology Section School of Integrative Plant Science Cornell University Ithaca NY 14853 USA Field of Genetics Genomics and Development Cornell University Ithaca NY 14853 USA

The cuticle is a crucial barrier on the aerial surfaces of land plants, in many plants, including Arabidopsis, the sepals and petals form distinctive nanoridges in their cuticles. However, little is known about how the formation and maintenance of these nanostructures is coordinated with the growth and development of the underlying cells. Here we report the characterization of the Arabidopsis cutin synthase 2 （cus2） mutant, which causes a great reduction in cuticular ridges on the mature sepal epidermis, but only a moderate effect on petal cone cell ridges. Using scanning electron microscopy and confocal live imaging combined with quantification of cellular growth, we find that cuticular ridge formation progresses down the sepal from tip to base as the sepal grows, pcUS2：：GFP-GUS reporter expression coincides with cutic- ular ridge formation, descending the sepal from tip to base. Ridge formation also coincides with the reduction in growth rate and termination of cell division of the underlying epidermal cells. Surprisingly, cuticular ridges at first form normally in the cus2 mutant, but are lost progressively at later stages of sepal development, indicating that cUS2 is crucial for the maintenance of cuticular ridges after they are formed~ Our results reveal the dynamics of both ridge formation and maintenance as the sepal grows.

关键词： Arabidopsis thaliana cellular growth cUTIN SYNTHASE2 (cUS2) cuticular ridges nanoridges sepal

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Status and prospects for symmetric organic redox flow batteries

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Journal of Energy chemistry 2025年第1期100卷 125-143页

作者： Md Al Raihan c.Adam Dyker Department of chemistry University of New Brunswick

As environmental concerns from fossil fuel consumption intensify, large-scale energy storage becomes imperative for the integration of renewable sources like wind, hydro, and solar with the electrical *** flow batteries, particularly those employing organic molecules, are positioned as a key technology for this purpose. This review explores the growing field of symmetric organic redox flow batteries(ORFBs) within this context. Unlike traditional asymmetric designs based on unique active materials for each electrode, symmetric ORFBs involve a single bipolar species for both electrodes. This review highlights the benefits of a symmetric design, and categorizes five distinct classes of organic bipolar molecules used in both aqueous and non-aqueous solvents. By providing a comprehensive overview of their cell cycling and performance characteristics, the strengths and weaknesses of the diverse categories of bipolar molecules are highlighted for both solvent systems, as are opportunities for future development. This should guide new research directions and advance the development of practical symmetric ORFBs.

关键词： Redox flow battery Symmetric battery Organic battery Aqueous electrolyte Non-aqueous electrolyte

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FATIGUE LIVES FOR INDUcTION HARDENED SHAFTS MATERIALS AccORDING TO THE ENVIRONMENTAL TEMPERATURES

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Acta Metallurgica Sinica(English Letters) 2005年第5期18卷 585-593页

作者： D.G. Lee k.c. Jang J.M. kuk I.S. kim korea Institute of Industrial Technology Gwangju 506-824 Korea Dept. of Mechanical Engineering Mokpo National University Mokpo 534-729 Korea

Rotary bending fatigue tests were carried out with two kinds of materials, S43c and S50c, using the front engine and front drive shaft （FF shaft） of vehicle. The specimens were induction hardened about 1.0mm depth from the specimen surface, and the hardness value on the surface was about HRc56-60. The tested environment temperatures were -30, 25 and 80℃ in order to look over effect of the induction hardening and the environmental temperatures on the fatigue characteristics. The fatigue limit of induction hardened specimens increased more about 45% than non-hardened specimens showing that the endurances of S43c and S50c were 98.1 and 107.9MPa in non-hardened samples, 147.1 and 156.9MPa in hardened samplesrespectably. The maximum tensile and compressive stress on the small circular defect was about ＋250 and -450MPa respectively when circular defect is situated on top and bottom. The fatigue life increased 80, 25 and -30℃ in order regardless of hardening. In comparison of the fatigue lives on the basis of tested result at 25℃, the fatigue lives of non-hardened specimens decreased about 35%, but that of hardened specimens decreased about only 5% at 80℃ more than at 25℃. And fatigue life of non-hardened and hardened specimens were about 110% and 120% higher at -30℃ than that of 25℃. Based on the result of stress distribution near the defect, the tensile and compressive stress repeatedly generated by load direction were the largest on the small circular defect due to the stress concentration.

关键词： induction hardening fatigue test front engine and front drive shaft,fatigue crack fatigue life fatigue life ratio

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Prediction of Pressure Drop of Slurry Flow in Pipeline by Hybrid Support Vector Regression and Genetic Algorithm Model

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chinese Journal of chemical Engineering 2008年第6期16卷 841-848页

作者： S.k. Lahiri k.c. Ghanta Department of chemical Engineering NIT Durgapur West Bengal India

This paper describes a robust support vector regression （SVR） methodology, which can offer superior performance for important process engineering problems. The method incorporates hybrid support vector regression and genetic algorithm technique （SVR-GA） for efficient tuning of SVR meta-parameters. The algorithm has been applied for prediction of pressure drop of solid liquid slurry flow. A comparison with selected correlations in the lit- erature showed that the developed SVR correlation noticeably improved the prediction of pressure drop over a wide range of operating conditions, physical properties, and pipe diameters.

关键词： support vector regression genetic algorithm slurry pressure drop

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Bifurcation phenomena and control for magnetohydrodynamic flows in a smooth expanded channel

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chinese Physics B 2014年第11期23卷 374-383页

作者： G.c.Layek mani Shankar Mandal H.A.khalaf Department of Mathematics The University of Burdwan Department of Mathematics Krishnagar Govt. College KrishnagarNadia 741101India Thi-Qar University Marshes Research Center Thi-QarIraq

This work reports the effects of magnetic field on an electrically conducting fluid with low electrical conductivity flowing in a smooth expanded channel. The governing nonlinear magnetohydrodynamic （MHD） equations in induction- free situations are derived in the framework of MHD approximations and solved numerically using the finite-difference technique. The critical values of Reynolds number （based on upstream mean velocity and channel height） for symmetry breaking bifurcation for a sudden expansion channel （1：4） is about 36, whereas the value in the case of the smooth expansion geometry used in this work is obtained as 298, approximately （non-magnetic case）. The flow of an electrically conducting fluid in the presence of an externally applied constant magnetic field perpendicular to the plane of the flow is reduced significantly depending on the magnetic parameter （M）. It is expansion （1：4） is about 475 for the magnetic parameter M found that the critical value of Reynolds number for smooth = 2. The separating regions developed behind the smooth symmetric expansion are decreased in length for increasing values of the magnetic parameter. The bifurcation diagram is shown for a symmetric smoothly expanding channel. It is noted that the critical values of Reynolds number increase with increasing magnetic field strength.

关键词： weakly electrically conducting fluid flow bifurcation asymmetric flow smooth expansion

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State-Based Offloading Model for Improving Response Rate of IoT Services

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computers, Materials & continua 2021年第6期67卷 3721-3735页

作者： k.Sakthidasan Bhekisipho Twala S.Yuvaraj k.Vijayan S.Praveenkumar Prashant mani c.Bharatiraja Department of Electronics and communication Engineering Hindustan Institute of Technology and ScienceChennai603103India Faculty of Engineering Built Environment Durban University of Technology(DUT)UniversityDurban4001South Africa SRM Institute of Science and Technology Kattankulathur603203India SRM Institute of Science and Technology NCR CampusModinagar201204India

The Internet of Things(IoT)is a heterogeneous information sharing and access platform that provides services in a pervasive *** and computation offloading in the IoT helps to improve the response rate and the availability of *** offloading in a service-centric IoT environment mitigates the complexity in response delivery and request *** this paper,the state-based task offloading method(STOM)is introduced with a view to maximize the service response rate and reduce the response time of the varying request *** proposed method is designed using the Markov decision-making model to improve the rate of requests *** defining optimal states and filtering the actions based on the probability of response and request analysis,this method achieves less response *** on the defined states,request processing and resource allocations are performed to reduce the backlogs in handling multiple *** proposed method is verified for the response rate and time for the varying requests and processing servers through an experimental *** the experimental analysis,the proposed method is found to improve response rate and reduce backlogs,response time,and offloading factor by 11.5%,20.19%,20.31%,and 8.85%,respectively.

关键词： Decision-making internet of things markov model task offloading task graph

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Solidification and crystallization properties of caO-SiO_2-Na_2O based mold fluxes

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International Journal of Minerals,Metallurgy and Materials 2009年第3期16卷 261-264页

作者： Sheng-ping He Qian Wang Dan Xie chu-shao Xu Z.S. Li k.c. Mills chongqing key Laboratory of Metallurgical Engineering College of Materials Science and Engineering Chongqing University Chongqing 400044 China Department of Materials Imperial College London London SW72AZ UK

crystallization properties play an important role in keeping a smooth running of continuous casting process and high surface quality of cast strands. To reduce fluorine pollution in slag, a new type of caO-SiO2-Na2O （cSN） based mold flux was studied. The solidification and crystallization properties, including crystallization temperature, crystallization ratio and solidification mineragraphy, were measured, which were compared with the caO-SiO2-caF2 （GF） mold flux. The results show that the crystallization performance is equal to the high fluoride mold powder and cSN can be used for peritectic steel grades sensitive to longitudinal cracking in continuous casting.

关键词： mold fluxes crystallization properties mineragraphy peritectic steel

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