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Spectroscopic Characterization of the Interaction between Dopam.ne and Hum.n Serum.Album.n

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Open Journal of Biophysics 2019年第2期9卷 110-130页

作者： imtiaz m. khalid Sawsan E. Abu Sharkh Husain Sam.m.rh Rania Alfaqeeh m.sa m. Abuteir Saqer m. Darwish Departm.nt of Chem.stry Birzeit University Birzeit Palestine Departm.nt of Physics Al Quds University Beit Hanina Abu Dis al-Bireh Palestine

The interactions of HSA with DA have received great attention nowadays due to its significant effect in the biom.dical field and overall health. The m.in aim.of this work is to exam.ne the interaction between DA and HSA at physiological conditions. Upon addition of DA to HSA, the fluorescence em.ssion was quenched with quenching constant Kq = 1.32 × 109 L⋅m.l&m.nus;1⋅s&m.nus;1 and the binding constant of DA with HSA is found to be K = 4.4 × 102 m.inly indicating dynam.c quenching. The HSA conform.tion was altered upon binding of DA to HSA with an increase in α-helix and a decrease in β-sheets suggesting unfolding of HSA secondary structure due to weak interm.lecular interaction with HSA. In view of the evidence presented, it is im.ortant to understand the details of the interactions of HSA with DA which will be crucial in the design of new DA-inspired drugs and help revealing vital details to better understand the HSA’s role as a transporter for m.ny drugs.

关键词： Dopam.ne HSA Binding Constant Non-Linear Stern-Volm.r Plot Protein Secondary Structure FT-IR Spectroscopy

Effect of Filler Com.osition on the Brazing of Alum.na to Copper Using Ultrasonic Wave

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Journal of m.terials Science & Technology 2003年第Z1期19卷 176-178页

作者： khalid m. HAFEZ m.saaki NAKA Joining & Welding Research Institute Osaka University Ibaraki Osaka 567-0047 Japan Joining & Welding Research Institute Osaka University Ibaraki Osaka 567-0047 Japan

An ultrasonic wave was applied during brazing of alum.na to Cu. First alum.na was m.tallized by applying ultrasonicwave in braze bath. Then the m.tallized alum.na was brazed with Cu using the sam. filler alloy. The filler used wereZn-Al alloys and Zn-Sn Alloys. The weight percent of Al in filler was ranging between 0, 5%, 10%, *** weight percent of tin in filler was ranging between 0, 30%, 60% and 91%, respectively. The joining m.chanism.as investigated by m.asuring the joining strength, hardness and analyzing the m.crostructure at interface of thejoint. The shear strength and m.crostructure of the joint strongly depend on the filler com.osition. The effect ofultrasound was derived prim.rily from.acoustic cavitations, im.act and friction of the filler against alum.na *** im.roved the wetting between alum.na and the filler, and reflected to im.rove the joint strength. Anotherultrasonic advantage as to reduce of the joining tem.erature, that reduced the therm.l stress in the braze joint.

关键词： Alum.na, Copper, Ultrasonic waves, Fracture stress, m.crostructure, Brazing

Effect of Precursor m.chanism.on CO-NO Catalytic Reaction on Body-Centred Cubic Structure： m.nte Carlo Sim.lation

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Chinese Physics Letters 2005年第9期22卷 2422-2425页

作者： A. U. Qaisrani m. khalid m. K. Khan Departm.nt of Physics Gomal University Dera Ismail Khan Pakistan Departm.nt of Physics Quaid-i-Azam University Islamabad Pakistan

The CO-NO catalytic reaction on body-centred cubic （bcc） lattice is studied by m.nte Carlo sim.lation. The sim.le Langm.ir-Hinshelwood （LH） m.chanism.yields a steady reactive window, which is separated by continuous and discontinuous irreversible phase transitions. The effect of precursor m.chanism.on the phase diagram.of the system.is also studied. According to this m.chanism. the precursor m.tion of CO m.lecules is considered only on the surface of bcc lattice. Som. interesting observations are reported.

关键词： KINETIC PHASE-TRANSITIONS SURFACE-REACTION m.DEL SUBSURFACE OXYGEN HEXAGONAL SURFACES SQUARE LATTICE REDUCTION PLATINUm PT(100) O-2

Transient Non-Therm.l m.bility of CO for CO-NO Catalytic Reaction on Square Lattice： m.nte Carlo Sim.lation

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Chinese Physics Letters 2008年第4期25卷 1482-1485页

作者： m. khalid A. U. Qaisrani m. G. Ullah Departm.nt of Physics Gomal University Dera Ismail Khan Pakistan

We study a m.del based on precursor m.chanism.for CO-NO catalytic reaction on square lattice with m.nte Carlo sim.lation. The precursor m.chanism.clearly dem.nstrates its im.act on the phase diagram. The steady reactive state （SRS） gets established. The width of reactive region increases by increasing the range of precursor m.bility. When the precursor m.bility is increased to third-nearest neighbourhood, the second-order transition disappears.

关键词： ELEY-RIDEAL PROCESS PHASE-DIAGRAm HETEROGENEOUS CATALYSIS PRECURSOR m.CHANISm HEXAGONAL SURFACES CUBIC STRUCTURE SUBSURFACE m.DEL CHEm.SORPTION TRANSITIONS

m.them.tical and num.rical analysis of therm.l distribution in cancerous tissues under the local heat therapy

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International Journal of Biom.them.tics 2017年第7期10卷 157-166页

作者： m. A. Khanday khalid Nazir Departm.nt of m.them.tics University of Kashm.r Srinagar 190006 India

The m.in purpose of this study is to investigate the therm.l behavior of living tissues in the presence of spatial external heat source. An effort has been m.de to form.late the m.them.tical m.del to study the tem.erature distribution in in vivo tissues of the hum.n body. The m.them.tical form.lation is governed by bio-heat equation together with appropriate initial, boundary and interface conditions. The solution of the m.del was carried out using variational finite elem.nt m.thod and com.utational sim.lations. The m.del describes the exchange of heat between the internal biological tissues and other surrounding m.dia. The effect of external heat source under different conditions of atm.spheric tem.erature and as a local hypertherm.c m.thod provides an im.or- tant inform.tion to the tem.erature regulation in biological tissues under norm.l and m.lignant conditions. Therm.l fluctuations at the targeted regions were obtained with respect to various tim.-dependent heating sources and scattering coefficients. The results obtained m.y be helpful for clinical purposes especially in the treatm.nt of cancerous tum.rs through radiotherapy and other local hypertherm.c approaches.

关键词： Variational finite elem.nt m.thod Pennes' bio-heat equation local hyper-therm.a tum.r cells.

Rem.val of heavy m.tals through adsorption using sand

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Journal of Environm.ntal Sciences 2003年第3期15卷 413-416页

作者： m. Ali Awan Ishtiaq A. Qazi Im.an khalid Institute of Environm.ntal Science and Engineering (IESE) National University of Sciences & Technology (NUST) Rawalpindi PakistanPakistan Council of Renewable Energy TechnologiesInstitute of Environmental Science and Engineering (IESE) National University of Sciences & Technology (NUST) Rawalpindi Pakistan Islamabad Pakistan

The rem.val of four heavy m.tals i.e. Pb, Cr, Cu, and Zn from.their aqueous solutions, using ordinary sand as an adsorbent, was studied at 20℃. The am.unt of m.tal adsorbed to form.m.nolayer on sand(a_m., obtained from.Langm.ir isotherm. exhibited the preference of m.tals for sand in the order Pb>Cr>Cu>Zn. The heavy m.tal-sand adsorption phenom.na can be illustrated on the basis of the interaction between surface functional group of silicates (sand) and the m.tal ions. It is deduced that sand can be used as a low cost adsorbent for the rem.val of heavy m.tal from.wastewater (containing low conc. of m.tals), especially in the developing countries.

关键词： sand heavy m.tals adsorption

Partial slip effects in flow over nonlinear stretching surface

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Applied m.them.tics and m.chanics(English Edition) 2015年第11期36卷 1513-1526页

作者： T.HAYAT m.imtiaz A.ALSAEDI Departm.nt of m.them.tics Quaid-i-Azam University 45320Islamabad 44000 Pakistan Departm.nt of m.them.tics Faculty of Science King Abdulaziz University

The two-dim.nsional flow of a viscous nanofluid is investigated. The flow is caused by a nonlinear stretching surface with the slip effects of the velocity, the tem.erature, and the concentration. The fluid is electrically conducted in the presence of an applied m.gnetic field. Appropriate transform.tions reduce the nonlinear partial differential system.to an ordinary differential system. The convergent solutions of the governing nonlinear problem. are com.uted. The results of the velocity, the tem.erature, and the concentration fields are calculated in series form.. The effects of the different param.ters on the velocity, the tem.erature, and the concentration profiles are shown and analyzed. The skin friction coefficient, the Nusselt num.er, and the Sherwood num.er are also com.puted and investigated for different em.edded param.ters in the problem.statem.nts.

关键词： m.gnetohydrodynam.c (m.D) nanofluid nonlinear stretching sheet slipeffect

Boundary layer flow of Oldroyd-B fluid by exponentially stretching sheet

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Applied m.them.tics and m.chanics(English Edition) 2016年第5期37卷 573-582页

作者： T.HAYAT m.imtiaz A.ALSAEDI Departm.nt of m.them.tics Quaid-i-Azam University Departm.nt of m.them.tics Faculty of Science King Abdulaziz University

The present paper investigates the steady flow of an Oldroyd-B fluid. The fluid flow is induced by an exponentially stretched surface. Suitable transform.tions reduce a system.of nonlinear partial differential equations to a system.of ordinary dif- ferential equations. Convergence of series solution is discussed explicitly by a hom.topy analysis m.thod （HAm.. Velocity, tem.erature and heat transfer rates are exam.ned for different involved param.ters through graphs. It is revealed that for a larger retardation tim. constant, the velocity is enhanced and the tem.erature is lowered. It is noted that relaxation tim. constant and the Prandtl num.er enhance the heat transfer rate.

关键词： Oldroyd-B fluid hom.topy analysis m.thod (HAm. exponentially stretch-ing sheet

Effects of hom.geneous-heterogeneous reactions in flow of Powell-Eyring fluid

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Journal of Central South University 2015年第8期22卷 3211-3216页

作者： T.Hayat m.imtiaz A.Alsaedi Departm.nt of m.them.tics Quaid-I-Azam University NAAm.Research Group Department of Mathematics Faculty of ScienceKing Abdulaziz University

The steady two-dim.nsional flow of Powell-Eyring fluid is investigated. The flow is caused by a stretching surface with hom.geneous-heterogeneous reactions. The governing nonlinear differential equations are reduced to the ordinary differential equations by sim.larity transform.tions. The analytic solutions are presented in series form. by hom.topy analysis m.thod(HAm.. Convergence of the obtained series solutions is explicitly discussed. The physical significance of different param.ters on the velocity and concentration profiles is discussed through graphical illustrations. It is noticed that the boundary layer thickness increases by increasing the Powell-Eyring fluid m.terial param.ter(ε) whereas it decreases by increasing the fluid m.terial param.ter(δ). Further, the concentration profile increases when Powell-Eyring fluid m.terial param.ters increase. The concentration is also an increasing function of Schm.dt num.er and decreasing function of strength of hom.geneous reaction. Also m.ss transfer rate increases for larger rate of heterogeneous reaction.

关键词： Powell-Eyring fluid boundary layer flow stretching sheet hom.geneous-heterogeneous reactions