STUDY ON THE SYNTHESIS AND PHYSICOCHEMICAL PROPERTIES OF SUCROSE POLYESTER

1. INTRODUCTIONSucrose polyester (SPE) is neither metabolized nor absorbed, it makes no caloric contribution to the diet. Excessive dietary fat intake is associated with increasing risk of obesity, high blood cholesterol, hypertension, coronary heart disease and some types of cancer. At present, fat substitutes are fashionable all over the world. SPE is a new functional fat substitute, which is similar to ordinary oils in physical and chemical properties. In a word, the research and dev…     

XPS STUDY ON THE DERIVATIVES OF N-β-PHENETHYL AMINE AND N-β-PHENETHYL GLYCINE

The X-ray photoelectron spectra of sixteen derivatives of N-β-phenethyl amine and N-β-phenethyl glycine have been studied. The effect of different structures on N_(1s) binding energy and that of their Pauling's atomic charge density on the nitrogen atoms are investigated. The experimental binding energy of N_(1s) is proportional to the calculated Pauling's atomic charge density. It shows that the phosphoryl group is the strongest nitrogen lone pair electron localizing group as compared with the corresponding sulfonyl and acyl derivatives. The XPS results agree with the data that there is no decarbonylation during the synthesis of N-dialkylphosphoryl-tetrahydro-3-benzazepin-l-one.     

A STUDY ON THE BEHAVIOUR AND MECHANISM OF EXTRACTING GOLD(Ⅲ)USING PTSO

PTSO is abbreviated from di-P-tolyl Eolphoxide having a>S=0 group and is a neutral extractant.We have studied the behaviour and conditions of the separation of Au(Ⅲ) from other elements on a column packed with the silica gel loaded with PTSO and have found that PTSO is a new stationary phase with extremely high selectivity for the separation and concentration of gold.However,the application of PTSO to the solvent extraction has not bean reported yet.We first studied the behaviour and mechanism using PTSO to extract gold by atomic-absorption spectrophotometry,ultra-violet spectrophotometry and infra-red spectrophotometry.The possible structure of the extractive formed from PTSO and Au(Ⅲ) is suggested.     

THE STUDY ON TRE KINETICS AND MECHANISM OF THE REACTIONS OF METAL IONS WITH PnAO

The kinetics and the mechanism of the formation reactions ofM(PnAO)~(2+)(M=Ni,Co,Cu)were studied with UV Spectrophotometer and StoppedFlow Spectrophotometer and a three steps mechanism was suggested.     

THE MECHANISM OF COPOLYMERIZATION OF VINYL AND DIVINYL MONOMER Ⅵ: A STUDY ON THE MECHANISM OF THE STRUCTURE FORMATION OF CROSSLINKED POLYSTYRENE

In order to study the mechanism of the formation of maeroporous copolymer, the overall reaction kinetics, phase separation and gelation of the S/EGDM in the presence of inert solvents and the physical properties of the eopolymer were investigated and compared with the corresponding system of S/DVB and S/DVB/MMA. The formation of the network structure of the macroreticular polymer was studied and a model of the mechanism suggested.     

STUDY ON THE TREATMENT AND REUSE OF WASTEWATER FROM THE PRODUCTION OF 2—NAPHTHANOL

Systematic studies on the treatment and reuse of the acid industrial watewater containing sodium 2-Naphthylsulfonate(β-salt)from 2-Naphthanol production process by ND-910 resin (made by self) is reported in this paper.Under the operation conditions of initial β-salt concentration of 10000-25000mg/L and initial CODCr of 20000-40000mg/L,the removal rates of Sodium 2-Naphthylsulfonate and CODCr are over 95% and over 89%,respectively.The effluent can be discharged directly after biological degradation.The working sorption capacity of ND-910 Resin for β-salt is over 230g/kg.An alkali-water wash procedure isutilized to regenerate resin and the reclaiming rate of β-salt is over 98%.     

STUDY ON THE MECHANISM OF STAINING BY ALLYLAMINE / OsO_4 ON PET FILM

It was proposed that in the staining process allylamine diffuses into amorphous region of PET film, reacting slightly with ester bond on PET chain and connecting with it and remaining in the amorphous area, then OsO_4 reacts with C=C group in allylamine, deposits in that region and hence, increases the contrast between amorphous and crystalline regions.     

STUDY ON DISPERSION SPEED AND MECHANISM OF MoO_3 AND CuCl ON THE SURFACE OF γ-Al_2O_3

It has been shown that many oxides and salts can disperse spontaneously onto supports with large surface area. A typical example studied widely is the disper-sion of MoO_3 on γ-Al_2O_3. However, the research work about the dispersion mecha-nism and kinetics is quite few.     

STUDY ON THE FORMATIONAL MECHANISM OF THE NORTHERN YELLOW (Huanghai) SEA COLD WATER MASS (Ⅱ)——DISCUSSION ON THE SOLUTION OF THE MODEL

The theoretical solution of the model of the Northern Yellow (Huanghai) Sea Cold Water Mass (NYSCWM) reveals that the NYSCWM is mainly formed through the continuous temperature increase of the overwintered water body above the Northern Yellow Sea Depression (NYSD) after spring when heat is continuously conducted from the sea surface to the'deeper layer. In the NYSCWM's growing period, (June-July), nonlinear, vertical convection and advection effects continuously increase, and are gradually balanced by the heat diffusion effect as the temperature increases from the surface to the bottom, which leads to the formation of an intensive thermocline and lateral front. Meanwhile, the three-dimensional circulation correspondingly occurs. In the NYSCWM's entire growing period, the horizontal circulation is always in the cyclonic motion, while the vertical circulation passes through a transition from a period with the cold centre as downwelling to a period with the cold centre as upwelling.     

STUDY ON THE FORMATION MECHANISM OF MONODISPERSE PARTICLES IN THE EMULSIFIER-FREE EMULSION POLYMEAIZATION OF METHYL METHACRYLATE AND BUTYL ACRYLATE

The formation mechanism of monodisperse polymer latex particles in the emulsifier-free emulsion polymerizationof methyl methacrylate and butyl acrylate with potassium persulfate as initiator was investigated. A multi-step formationmechanism for the monodisperse polymer particles was proposed. The nucleation mechanism is considered to be thecoagulation of the precursor particles by homogeneous nucleation when the primary particles reach a critical size with highsurface charge density and sufficient stability. It had been proved by a special experiment that the early latex particles formedby the coagulation were stable. The primary particles grow by absorbing monomers and radicals in the polymerization systemand then become colloidally unstable again due to the understandable decrease of particle surface charge density, which leadsto the aggregation of the growing particles and the formation of larger latex pedicles therefrom. Aner the nucleation period,the preferential aggregation of the smaller particles in the propagation process leads to the change of the particles towards auniform size and narrower particle size distribution. The coexistence and competition of homogeneous nucleation,coagulation, propagation and aggregation result in the increase of the polydispersity index (U = D_(43)/D_(10)) in the first Stage,then its decrease in the later stage because of the competition of propagation and aggregation, and the gradual formation ofthe monodisperse particles.     

STUDY ON THE BLOOD FAT REGULATION OF THE FUCOIDA-GALACTOSAN SULFATE (FGS) FROM LAMINARIA JAPONICA

1. INTRODUCTION Blood fat primarily contains cholesterol, cholesterol ester, phosphatide, triglyceride and free fatty acid in serum of human being and mammalian. Under physiological conditions, the lipids transport in the form of lipoproteins linked with the proteins. Except for the free fatty acid linked with albumin, the other lipids are linked with the globular proteins into high-density lipoproteins (HDL), low density lipoproteins (LDL), very low density lipoproteins (VLDL) and so…     

STUDY ON THE STRUCTURE AND PROPERTIES OF 4-(2-PYRIDYLAZO)-RESORCINOL(PAR) AND ITS DERIVATIVES

The dissociation constants of the reagents were determined spectrophotometrically, the existential patterns of PAR in aqueousalcohol solution were studied by quantumchemical method, and the color reactions between these reagents and Nickel(Ⅱ) were investigated.     

STUDY ON THE STRUCTURES OF COORDINATION COMPOUNDS OF N-(ortho-METHYL)-AND N-(ortho-METHOXY)-PHENYL IMINODIACETATO-Cu(Ⅱ)

The coordination compounds,{Cu[CH_3C_6H_4N(CH_2COO)_2]}.2H_2O and{Cu[CH_3OC_6H_4N(CH_2COO)_2]}.2H_2O,have been prepared and its crystal struc-tures determined.The final discrepancy factors are R=0.052,R_w=0.061 for(I)and R=0.052,R_w=0.039 for(Ⅱ).The geometry of the coordination poly-hedron with Cu(Ⅱ)is a distorted tetragonal pyramid for(Ⅰ)and an unsym-metrical and extended tetragonal bipyramid for(Ⅱ),respectively.The re-sults of EHMO calculations indicate that the ligand mainly provided thefield with very few of its electrons being coordinated to the central atom.     

STUDY ON THE FORMATIONAL MECHANISM OF THE NORTHERN YELLOW (HUANGHAI) SEA COLD WATER MASS(Ⅰ)——SOLUTION OF THE MODEL

A hydrodynamic-thermodynamic equation set was set up to reflect the formational mechanism and evolution of the Northern Yellow (Huanghai) Sea cold water mass (NYSCWM) and its density circulation. Appropriate mathematical physical models were established by using some physical postulations. An approximate analytic solution to expound the distributions of temperature and three-dimensional current velocity, which can be used to expound the formational mechanism of the NYSCWM and its density circulation is obtained by using the theory of boundary layer and perturbational analyses.     

STUDY ON THE RELATIONSHIP BETWEEN MELTING POINT AND ACID DENATURING ACIDITY OF DNA BY ULTRAVIOLET SPECTROMETER

ＳＴＵＤＹ　ＯＮ　ＴＨＥ　ＲＥＬＡＴＩＯＮＳＨＩＰ　ＢＥＴＷＥＥＮ　ＭＥＬＴＩＮＧ　ＰＯＩＮＴ　ＡＮＤ　ＡＣＩＤ　ＤＥＮＡＴＵＲＩＮＧ　ＡＣＩＤＩＴＹ　ＯＦ　ＤＮＡ　ＢＹ　ＵＬＴＲＡＶＩＯＬＥＴ　ＳＰＥＣＴＲＯＭＥＴＥＲＳＴＵＤＹＯＮＴＨＥＲＥＬＡＴ...     

STUDY ON SOLUBILIZATION MECHANISM IN THE SYNTHESIS OF HIGH MOLECULAR WEIGHT POLY(p-PHENYLENE TEREPHTHALAMIDE)

The salts dissolved in the amide solvent play an important role in the synthesis of high molecular weight poly(p-phenylene terephthalamide) (PPTA). The solubilization of salts was investigated in this paper. The effects of association-dissociation equilibrium of salts and the solvation of their ions as well as hydrogenbond on solubilization were discussed in some detail. The effects were attributed to cations and anions of salts respetively. Finally, the equation of solubilization was established according to the experimental results and some thermodynamic laws. The relations between molecular weight of PPTA and the solubilization were discussed.     

SYNTHESIS OF α-AMINO-β-(4-IMIDAZOLYL)-ETHYLPHOSPHONIC ACID,THE PHOSPHONOISOSTERE OF HISTIDINE

A short synthesis starting from 4-imidazolylmethanol(2)was developedfor the phosphonoisostere of histidine,-amino-β-(4-imidazolyl)-ethylphosphosphonic acid,His(P)(1).The synthesis features Wittig-Hornerreaction of aldehyde(4)with diphosphonate(5)followed by selectivedetritylation with 50% formic acid.     

THE PHOTOCHEMICAL SYNTHESIS OF THE PYRIDINE ADDUCT OF TETRAPHENYLPORPHYRINATORHODIUM(Ⅱ)AND THE MECHANISM OF PHOTOCHEMICAL REACTION

A new rhodium(Ⅱ)porphyrin complex was isolated by chromatography from the photochemical reac-tion of(μ—tetraphenylporphyrinato)bis[dicarbonylrhodium(Ⅰ)]with pyridine in benzene and has been charac-terized.From the results,the reaction mechanism is proposed.     

STUDY ON THE MECHANISM OF INTERFERON ACTION (Ⅺ)——EFFECT OF pppA2''''p5''''A2''''p5''''A ON THE LEVEL OF cAMP AND cGMP IN MACROPHAGES

In this paper, the increase of cellular cAMP and cGMP levels in macrophages induced bypppA2'p5'A2'p5'A (briefly 2'-5'P_3A_3) is first reported. The optimal concentration of 2'-5'P_3A_3 for the elevation of cellular cGMP to the highest level is 10~(-7)-10~(-6)mol/L, while thatfor cAMP is 10~(-7)mol/L. The time for cGMP to reach its peak value is 15 min and that forcAMP is 2 h, when the cells are treated with 2'-5' P_3A_3 at 10~(-7)mol/L, which is the optimalconcentration for developing biological effect of macrophages (phagocytosis). These resultssuggest that cGMP and cAMP may be related to, or may be the mediators for, 2'-5'P_3A_3action.