Adsorption of the Enantiomers of Tryptophan on Stationary Phase Bonded with Bovine Serum Albumin

Chromatography has become the most generalmethod to carry out preparative enantiomeric separa-tions, especially for the production of pure pharma-ceuticals and pharmaceutical intermediates[1,2]. En-antiomeric separation should be carried out on chiralstationary phases (CSPs) column due to its advan-tages over other techniques of enantiomeric separationavailable. However, CSPs often have a relatively lowadsorption capacity. In the past decades, severalkinds of CSPs have been developed[3,4].…     

Determination of Trace Molybdenum（VI） by Oscillographic Potentiometric Catalyzing Kinetic Method of Simplex Optimization

1　Introduction　Ahugeamountofliteratureexistsonthestudyofi dentifyingtracemetalionsbymeansofspectropho tometry[1 3] ,fluorimetry[4 6 ] aswellas polarogra phy[7 9] ,whichhaveactiononlocatingtheendpointoftheindicatingreaction .Howeverbothspectropho tometryandfluorimetryareeasytobeinterferedbycolororprecipitation ,whilepolarographyhasanissueofmercurypollution .Thecatalyzingkineticanalysishasthecharacteristicsofhighsensitivityandspeedi ness.Oscillographicpotentiometryisasimpleintu itionisticanal…     

A Monte Carlo Model of Light Propagation in Nontransparent Tissue

Opticalcoherencetomography (OCT)wasorigi nallydevelopedforimagingintransparenttissue[1] .Since1 995 ,OCThasbeenadvancedtoimagefromophthal mologytonontransparenttissuewithahighimagingres olution[2 ,3 ] .OCTdemonstratesitsgreatestpotentialinsituationswhereconventionalbiopsyiseitherdangerousorineffective[4] .Becauseofthecomplexityofthelightpropagationinnontransparenttissue,theapplicationofOCTinhighlyscatteringbiologicaltissuesuchasskintis suearenotoptimistic.Yadlowsky[5] explainedthatmul tip…     

Synthesis of 3-Alkyl-5-Benzylidene-2,4-Thiazolidinedione Under Microwave Irradiation

5 Benzylidene 2 ,4 thiazolidinedionederivativesarere portedtohavediversebiologicalactivities[1] suchasantidia betic[2 ] ,antibacterial[3] andanticonvulsant[4 ] activities .Forexample,pioglitazoneandrosiglitazonehavebeenlaunchedrecentlyfortypeⅡdiabetesmellitus[2 ] .Theyalsocanbeusedforthetreatmentofpsoriasis[5] andobesity[6 ] .　　Thegeneralmethodsforthesynthesisof 5 benzylidene 2 ,4 thiazolidinedionewasKnoevenagelcondensationof 2 ,4 thiazolidinedionewitharomaticaldehyde .　　Inrecentyear…     

Starch Modification by Graft Copolymerization of Acrylonitrile

Starch(St)isoneofthemostplentifulrenewablenatu ralresources .Ithasbeenwidelyappliedinthepaper,textileandfoodindustriesetc[1] .Asitisbiodegradableintheenvi ronment,starchcanbeaddedtosyntheticplasticstoreducethe“whitepollution”[2 ] ,orusedaspolyamideintheoilfield[3] .Sincethecompatibilityofstarchwithsyntheticplas tics,processingpropertyandmechanicalpropertiesarenotgoodenough ,chemicalorphysicalmodificationisobviouslynecessary .　　Graftcopolymerizationisoneoftheeffectivewaystoim provethecompr…     

Another Method to Find the Derivative of Sin

1　 IntroductionIt is very important to find thederivative of sine in mathematics.For eachderivative of trigonometric functions isbegin with sine.The sketch of its proof istransforming two subtracted sine functionsinto the form of multiplication[1 ] [2 ] [3 ] [4] [5] [6] .But this method appears the form offraction,so it is difficult for the beginnersand the self - learners to understand theincrement of the sine functionΔy[1 ]Δy =sin(x +Δx) - sinx=2 cos(x +Δx2 ) sinΔx2 .In this paper,we …     

Static and Dynamic Analyses of Long-Span Spatial Steel-Cable-Membrane Hybrid Structures

Withthedevelopmentofeconomyandtherequire mentofmunicipalconstruction ,long spanspatialstruc turesariseinthecitiesrapidly .Furthermore ,thespansofstructuresbecomelongerandlonger ,andthestruc turalsystemsbecomemoreandmorecomplex .Atthesametime,somecomplicatedcompositeorhybridstruc tures ,suchastensegritystructure[1,2 ] ,cable membranestructure[3,4 ] ,openablestructure[5] ,stringstructure[5] ,andinflatablestructure[4 ] etc .,appearsuccessivelybyus ingthematerialsofsteel,cableandmembranesyntheti c…     

Random Model and Simulation for Nucleation Stage of Emulsion Polymerization

Mathematicalmodelsandsimulationsofemulsionpolymerizationhavebeenstudiedforseveraldecades .Re cently ,averycomprehensivereviewofithasbeenpub lished[1] .Infact,sincethephysicalmodelofemulsionpolymerizationwasfirstproposedbyHarkins[2— 4 ] inlate194 0s ,manyscientistsandengineersdevotedtheiratten tiontothequantitativeresearchofemulsionpolymeriza tion .ThemostimportantandfamoustheorywastheclassicaltheoryestablishedbySmithandEwart[5— 7] .Onthebasisofaseriesofreasonablysimplifiedassumptions ,Smit…     

Accurate Jones Matrix of the Practical Faraday Rotator

TheFaradayrotatorisoneoftheessentialelementsofopticalisolatorsandopticalcirculators[1,2 ] ,whichiswidelyusedinopticalfibercommunicationandopticalprecisemea surementsystems .Asisknown ,itisconvenienttoresearchthetransformationsofpolarizedlighttopassthroughsomeop ticalelementswiththehelpofJonesmatricesoftheelements .Therefore ,itisnecessarytoknowtheJonesmatricesoftheopticalelements .FortheidealFaradayrotator,itsJonesma trixwhichisfamiliartouscanbeusedinsomesituations[3] .ButthepracticalFarada…     

Characterizations of PSD Fractal of Porous Medium

Fractalisatermusedtodescribegeometricalobjectsthatareinvariantuponthechangeoflengthscale .Manyfrac talcharactersofscaleinvarianceonporousmediumshavebeeninvestigatedduringthepastdecades[1] .Particle sizedistribution (PSD)isafundamentalpropertyofporousmedi ums.PSDofporousmediumsiscommonlyreportedintermsofthepercentagesofvariousparticle sizeintervalsandhasusuallybeenfoundtoobeypowerscalingofthetype[2 ]　　　N(≥d)∝d-Dp (1)whereN(≥d)isthenumberofparticlediameterlargerthanorequaltod ,andthepow…     

Construction of Virtual Turning Scene Based on Local Ray Tracing Algorithm

Withtherapiddevelopmentofmanufacturingtechnology ,traditionalsimulationofmachiningcannotmeettheneedsofthepeople .Userswanttowatchnotonlythecuttingprocessbetweenthecutterandthesemi finishedpro ducts,butalsothewholemachiningscene .Manyexpertshavefocusedtheirattentiononthisstudy :aframeofvirtualmachiningfordiamondturningbuiltbyCheung[1] caneveninspecttheaccuracyofthework piece ;Zhang[2 ] builtavirtualmachiningcenterandthecorrespondingmeasuringcell;Wang[3] describedandconstructedavirtualcuttingsy…     

Vibration Control Induced by Ice of a Jacket Platform

Thevibrationinducedbyiceisanimportantfactorofdamageforjacketplatforms ,sotheiceloadshavebeenthecontrolloadforjacketplatformsintheBohaiBay[1] .Toreducedamageinducedbytheiceforce ,theloadsstandardofjacketplatformshasbeenimproved .Infact ,thestrengthofjacketplatformsagainststaticiceforceismeteasily .But,thesafetyproblemoftheplatformaf fectedbyboththebehaviorsofself excitedandcouplingissolvedbyothertechnologysolutions[2— 3] .Xuetalde signedasetofdevicesforreducingvibrationofthejacketplatforminth…     

New Method for the Determination of Ionization Constants of Polyprotic Weak Acid

Ionizationconstantsofpolyproticweakacidsarebasicthermodynamicsdata .Undermanycircumstances ,measurementsofionizationconstantsofpolyproticweakacidsareroutinelynecessary ,e .g .,fornewcompounds ,forwell establishedcompoundsatagiventemperaturewherepreviousdataareunavailable,andindifferentsol ventsystems.ThemainmethodsfordeterminationofionizationconstantsreportedinRefs.[1]— [4 ]arecon ductometricmethod ,potentiometrictitrationmethod ,NMRmethodandspectrophotometricmethod .Inthispaper,anewmethodf…     

Measurement and Correlation of Solubility for Propylene in 2-Propanol-Water Solutions

Fromapracticalpointofview ,theintegratedprocessofepoxidationofpropylenewithhydrogenperoxidetopreparepropyleneepoxideisofconsiderableinterest,notonlybe causeoftheirpositivecontributiontotheenvironment,butal sotheirimprovementsoftheoxidationefficiencyofhydrogenperoxide[1— 3] .Inthedevelopmentofthoseprocesses ,thesolubilitydataofpropyleneinvarioussolventsforthegenera tionofinsitu hydrogenperoxideplayanimportantrole[4 ] .　　Inourpreviouspapers[5— 7] ,wehavereportedseveralvapor liquidequilibrium…     

Algorithm of solutions for generalized nonlinear implicit quasivariational inclusions with fuzzy mappings

1 Introduction In 1994, Hassouni and Moudafi [1] introduced a class of variational inclusions which included many variational inequalities and quasivariational inequalities as special cases. Adly [2], Huang [3] , Kazmi [4] and Ding [5,6] extended the resu…     

H_2S Stress Corrosion Tests of Welded Joint for X65 Pipeline Steel and Finite Element Numerical Analysis of Crack Tip

Theresistanceofapipelinesteeltohydrogensulfidestresscorrosioncracking (SCC)andhydrogen inducedcrack ing (HIC)isveryimportantforsteeltobeusedinsouroil/gasapplications.ElongatedMnSinclusionsarethemostsus ceptiblesitesforHICinitiation[1] ashydrogenatomscaneasi lyaccumulateattheinterfacebetweenthesteelmatrixandnon metallicinclusions.ThesegregationofsuchelementsasP ,Mn ,Cinthesteelenhancestheformationofhardbandsoncooling[2 ] .Theexistenceofthebandingstructurenotonlydecreasestheresistanceofthe…     

Solid Phase Peptide Synthesis of Fusukang for AIDS

Acquiredimmunodeficiencysyndrome (AIDS)iscausedbytheinfectionofhumanimmunodeficiencyvirus(HIV ) .Glycoproteingp4 1isfoundtobethekeytoHIV′sinfectiontocellT[1] .Dr.ZhoudesignedapeptidenamedFusukangasanHIVmembranefusioninhibitoraccordingtothestructureofgp 4 1.　　Fusukangconsistsof 36aminoacidresidues,andissynthesizedbythemanualsolidphasepeptidesynthesistechnique[2 ,3] inthisresearch .1　Materialsandmethod1.1　Materials　　 9 fluorenylmethoxycarbonyl(Fmoc)aminoacids ,Wangresin ,dicyclohe…     

CFD Analysis of Gas Distributor in Packed Column ——Prediction of Gas Flow and Effect of Tower Internals Geometry Structure

Asoneofinternalparts,thefeedgasdistributorplaysanimportantroleinapackedcolumn.Thesmoothoperationandbetterqualityofproductsaregreatlyinfluencedbyitsperformance,especiallyinthecolumnwithlargediameter,shortpackedbedandlowpressuredrop.Duetotheimpor tanceoftheuniformityofinletgasdistribution ,itisessentialtodesignagoodfeedgasdistributor.However,fewtheoreti calandexperimentalapproacheshavebeencarriedoutinthisareasofarduetothecomplexityofthefluidflow[1 ,2 ] .　　Theliquidflowstructureisimprovedbyanew…     

Molecular modeling study of the effect of base methylation on internal interactions and motions in DNA and implication to B-Z conformation change

1. Introduction Experimental studies have shown that a DNA molecule with alternating pyrimidine-purine sequence can adopt a left-handed, double-helical Z-DNA conformation [1,2]. Such structural changes of DNA occur as a consequence of environmental conditions such as at salt concentration above 4 mol/L NaCl [1,2] or through certain chemical modification such as methylation [1] or bromination [2,3] of bases at physiological conditions. These structural changes and chemical modifications …     

Simulating Experiment and Circuit Simulation of RTD/HPT Photo-Controlled MOBILE

Theresonanttunnelingdiode (RTD) [1] isahigh speednanoelectronicdevicebasedonquantumresonanttunnelingeffect.Ithastheadvantagesofhighspeed,highfrequency ,lowoperatingvoltage,low powerdissi pation,intrinsicbistabilityandself latchingduetoitsnegativedifferentialresistance .Comparedwithconven tionaldevice,ithasthefeatureofreducingthenumberofdevicesandcircuitcomplexityforachievingthesamelog icfunction .　　TheMOBILE[2 ,3 ] isalogicelementrealizingthemonostable bistabletransitionofacircuitthatcon…