SEPARATION AND ACCUMULATION OF Mn, Fe AND THE FORMATION OF Mn NODULES

The sediment samples (including various layers) obtained from 12 stations, 35 Mn nodule samples from 16 stations and water body samples were collected during Mn nodule investigation made in the Pacific Ocean in summer, 1983. The coexisting, separating and accumulating regularities and their relation concerning the formation of Mn nodules are approached through the distribution and partition characteristics of Mn and Fe combined with the data from nearshore area in the East China Sea continental shelf.     

A NEW AND EFFICIENT SYNTHESIS OF 3-IODO DERIVATIVES OF FLAVONES, THIOFLAVONES AND THIOCHROMONES

The title compounds are prepared in good yields by iodination of the corresponding flavones, thioflavones and thiochromones respectively using I_2-CAN(ceric ammonium nitrate) system. The compounds thus prepared are potentially useful precursors for the synthesis of C-3 linked binuclear compounds.     

SYNTHESIS OF ACIDIC PHOSPHATES AND PHOSPHONATES AND THEIR STRUCTURE-REACTIVITY STUDIES ON THE EXTRACTION OF NEODYMIUM, SAMARIUM,YTTERBIUM AND YTTERIUM

Methods for the synthesis of five types of acidic phosphates, phosphonates as well asohosphinates have been deseribed. The mechanism of extrastion of rare earth of these com-pounds is examined. A free energy relationship existed in plotting equilibrium constantsagainst either pKa or ∑σ values of the acidic organophosphorus compounds under investiga-tion. Steric effects play an important role in these extrastion systems as expected. Thereactivity-selectivity principles in solvent extraction proposed by our laboratory are well de-monstrated in extraction of rare earth by acidic phosphorus--based ligands.     

MONOMOLECULAR FILMS OF COPOLYMERS OF OXYETHYLENE AND OXYPROPYLENE, POLYPROPYLENE GLYCOL AND THEIR BINARY MIXTURES

The behaviour of monolayers of copolymers of oxyethylene and oxypropylene (UH29 and UH68), polypropylene glycol (UHPPG)and their binary mixtures on air-water interface has been investigated carefully on compression-expansion cycles. The first compression isotherm is approximately an equilibrium one. In the UHPPG-UH29 and UHPPG-UH68 systems, the calculated average π-a curves based on simple additivity of the two individual components coincide with the experimental results reasonably well. It is suggested that the two components are miscible and form near-ideal solution at the air-water interface. The compression-expansion cycle experiments shows some degree of hysteresis. The order of degree of hysteresis for individual components is UH68>UH29>UHPPG. The explanation for the hysteresis is proposed.     

THE IMMOBILIZATION OF AMINOACYLASE AND THE RESOLUTION OF D,L-PHENYLALANINE

A polymer with suitable physical characters and matched functional groups was synthesized,and used as a supporter to immobilize aminoacylase. The results showed that this supporterhad high immobilizing capacity and high selectivity for aminoacylase. Immobilized amino-acylase had high specific activity. In this paper, we determine the physical and chemicalcharacters of aminoacylase for resolution of D,L--phenylalanine, including its optimum tem-perature, pH, ion concentration, activated ion, substrate concentration, thermal stability anddenaturation. The immobilized aminoacylase was used to resolve the D,L-phenylalaninecontinuously. Thc resolved products was separated and purified with ion-exchange resins. L-phenylalanine solution was concentrated by vacuum evaporation and its hydrochloride wasformed. Checking of final product with polarimeter showed high yield and purity.     

CRYSTAL AND MOLECULAR STRUCTURE OF N, N-PLATINUM-DIETHYL-DICHLORIDEDI-L-ASPARTATE

This paper reports the crystal and molecular structure of title compound. 3978 three-dimensional independent reflections were collected by Syntex R3 four circle diffractometer. The crystal is monoclinic with space group P2_1, a=8.074(1), b=11.309(4), c=27.793(9), β=106.84°(2), Z=4. The molecular formula is Pt(C_8 H_(15)O_4N)_a Cl_2. The crystal structure was solved by Patterson method and refined by block matrix least squares refinement techniques. The final R factor is 0.039.The result of crystal structure analysis shows that Pt(Ⅱ) has a dsp~2 hybrid orbital and square coordination. Two C1 atoms are located oppositely to two diethyi-dichloride-di-L-aspartare. N atoms have sp~3 tetrahedral hybrid configurations and form the coordinate bonds with Pt(Ⅱ) atom using their lone pair electrons. By reason of molecular packing and due to the formation of inner hydrogen bonds in the complex molecule, the configuration of L-aspartic acid in the title complex is more twisted than that of L-and DL-aspartic acid     

SYNTHESIS, STRUCTURES, PROPERTIES AND APPLICATIONS OF HYPERCROSSLINKED POLYSTYRENES

Synthesis, structures, properties and applications of hypercrosslinked polystyrenes are reviewed with 50 refereneces.     

RAMAN SPECTROSCOPY OF C,H,L AND LL CHONDRITES AND ITS SIGNIFICANCE IN EXPLORING THE FORMATION ENVIRONMENTS OF METEORITES AND THEIR TAXONOMY

The comparison of Raman spectra of the chondrites (C, H, L, LL) has confirmed thatthere exist two types of meteorite carbon: one is the primary carbon present in carbonaceouschondrites (c) and the other is the secondary carbon contained in ordinary chondrites (H, L,LL). The parameter of order (I_G/I_D intensity ratio, similarly hereinafter) of primary car-bon tends to decrease with increasing petrologic type and it can reflect the temperature ofdust carrier at the time plasma gases in the early nebula were condensed to form primarycarbonaceous material and the hydrogen content in primary carbonaceous material. This kindof primary carbonaceous material maybe has not experienced late stage thermometamorphismwithin the parent body of chondrites, indicating that the carbonaceous chondrites wereformed and retained in the low temperature region of the solar system. The parameter oforder of the secondary carbon tends to increase with increasing petrologic type and it can re-flect the degree of graphitization o     

FLUCTUATIONS AND FUTURE TREND OF CLIMATE, GLACIERS AND DISCHARGE OF ■R■MQI RIVER IN XINJIANG

Based on the analyses of various data available of the rümqi River, Xinjiang, it is found that the warming trend of the climate in recent years is mainly accompanied by the decrease in precipitation, discharge, and glacial mass balance. Since the Little Ice Age, the temperature has increased by 0.5—1.0℃, while the precipitation, glacial volume and annual discharge have decreased by 50 mm, 41% and 11%, respectively. It is possible that the trend would last for the next 10—15 years.     

ELECTROCHEMICAL AND SPECTROELECTROCHEMICAL CHARACTERIZATION OF p-TRICYANOETHENYL-N,N-DIMETHYL ANILINE

The redox behaviours of a donor-acceptor model compound. p-tricyano-ethenyl-N, N-dimethyl aniline was investigated by electrochemical and spectroelectrochemical methods. The results indicate that charge transfer between the donor(amino) and the acceptor(cyanoethenyl) groups takes place in the process of oxidation of this compound.     

CRYSTAL AND MOLECULAR STRUCTURE OF N-CYANOMETHYI,BENZOIC SULFIMIDE

<正> C9HsN2O3S, Mr=222.218,monoclinic space group P21/n,B=12,584 (4).b =10.788(3), c= 15.124(4)A,β=106.83(2)°,V=1965.3A3,Dc= 0,75 g/cm3,Z=8,μ(MoKα)=1.5cm-1, F(OOO)=456(e),λ=0.7107A,R=0.067, Rw=0.059. Two Bolecules are in an asymmetric unit in the crystal. Structural analysis showed that all atoms of the two rings of benzoic sulfinide are in the sane plane which is normal to plane S(1)O(1)O(2). The C=N group is above the plane of the two rings.     

DENSITY, EQUILIBRIUM HEAT OF FUSION AND EQUILIBRIUM MELTING TEMPERATURE OF NYLON 1010

The density, equilibrium heat of fusion and equilibrium melting temperature of Nylon 1010 were determined by means of infrared spectrum, differential scanning calorimetry, wide angle X-ray diffraction and density measurement techniques. According to Starkweatber' s method crystalline density ρ_c and amorphous density ρ_a were estimated to be 1.098 and 1.003 g/cm~3 respectively by extrapolating the straight lines of the IR absorbanee against density to zero intensity. Owing to the less intense in absorbance and less sensitive to the change in crystallinity of the amorphors band the thus obtained ρ_c was too low in value. Thereby the value of the ratio ρ_c /ρ_a is far less than generally accepted mean value for most crystalline polymers. Accordingly, traditional X-ray diffraction method was used through determining thc crystalline dimension(a=4.9, b=5.4, c=27.8, α=49°β=77.0°, γ=63.5°), and a rather correct value of ρ_c or the crystal density 1.13 g/cm~3 was obtained. The equilibrium heat of fusion △H_m~0 was estimated to be 244.0 J/g piotting △H_m 's of specimens with different crystallinity against their corre sponding specific volumes _(sp), and extrapolating to completely crystalline condition (_(sp)~c= 1/ρ_c) As to the equilibrium melting temperature T_m~0, because of the easiness of recrystallization of melt crystallized Nylon 1010 specimen, the well-known Hoffman's T_m-T_c method failed in determining this value and an usually rarely used Kamide double extrapolation method was adopted. The so obtained value of T_m~0 487 seems to be fairly reasonable.     

THE FORMATION AND CRYSTAL STRUCTURE OF DIHYDRONITIDINE AND DISCUSSION OF ANTICANCER MECHANISM OF NITIDINE CATION

The paper reports the formation and crystal structure of dihydronitidine, expounds thereasons and conditions of easily formed oxynitidine, and discusses anticancer mechanism ofnitidine (cation). The crystallographic parameters of dihydronitidine are: space group P2_(1/n),a= 12.54(1), b = 9. 148(5), c = 14.748(8)A, β= 92. 12(6)°,Z =4. 4108 independent reflec-tions were collected within the range of 3°≤2θ≤54°, of which 2137 intensity data with I≥3σ(I) were used in the structural determination. The crystal structure has been refined byfull matrix least-square method to a final R of 0.050.     

CLONING, EXPRESSION AND CHARACTERIZATION OF Pro3 GENE OF YEAST Saccharomyces cerevisiae

The proline biosynthetic pathway and Pro genes in Saccharomyces cerevisiae have just begun to be studied recently. In our laboratory, Pro2 gene of S. cerevisiae had been cloned in yeast. As described in this paper, yeast Pro3 gene was also cloned, which can complement yeast Pro3 mutants, and be expressed efficiently in E. coli. The high activities of this gene product, L-pyrroline-5-carboxylate (P5C) reductase, can be detected in both organisms. The activity of the Pro3 gene product in multiple copy plasmids is not higher than that of single copy genes in chromosomes in both yeast and E. coll. The preliminary characterization of the gene is also reported.     

SYNTHESES AND CRYSTAL STRUCTURES, REACTION OF α -THIOPI-COLIN-o-TOLUIDIDE AND ITS ORGANOTIN COMPLEX

<正> α-thiopicolin-o-toluidide and its organotin complex have been synthesized, and both crystal structures have been determined by X-ray analysis. The ligand:C13 H12N2S,Mr = 228. 3,monoclinic,P21/n,a=16. 387(1),b = 7. 752(2),c=18. 334(1) A ,β=95. 52(1),V = 2324. 8A3,Z = 8,DC=1. 305g·cm-3,F(000) = 960e. The final R= 0. 053 for 3291 observed unique reflections. There are two molecules in the asymmetric unit,which are confirmed to exist as the keto,cis-N configuration in the solid state. The complex:C17H21N2SClSn,Mr = 439. 6,orthorhombic,P212121,a = 8. 801(3),b = 9. 188 (2),c=24. 087(6) A,V=1947. 9A3,Z = 4,DC=1. 499g·cm-3,F(000) = 880e. The final R = 0. 041 for 1694 observed unique reflections. The tin atom is surrounded by an irregular (5 + 1) coordination geometry with five normal bonds and one weak bond [Sn....C1]. The molecules join each other through the weak bonds to form infinite polymeric chains parallel to the a axis. In addition, the possible reaction mechanism in coordination is discussed.     

DISCOVERY OF DEHYDROXYTOCOPHEROL IN CRUDE OIL AND SOURCE ROCK,AND ITS SIGNIFICANCE

Reported here is a novel kind of biomarker compounds, dehydroxytocopherol, detected in crude oil and source rock formed in hypersaline lake environment.Mass spectra data of three homologues are given and the possible geochemical significance of these unusual compounds is discussed briefly.     

MISCIBILITY AND MORPHOLOGY OF THIN FILMS OF BLENDS OF POLYSTYRENE WITH BROMINATED POLYSTYRENES： EFFECTS OF VARYING THE MOLECULAR WEIGHT, BROMINATION DEGREE AND ANNEALING

Thin films of incompatible polymer blends can form a variety of structures during preparation and subsequent annealing process. For the polymer blend system consisting of polystyrene and poIy(styrene-co-p-bromo-styrene), i.e., PS/PBrxS, its compatibility could be adjusted by varying the degree of bromination and the molecular weight of both components comprised, in this paper, surface chemical compositions of the cast and the annealing films were investigated by X-ray photoelectron spectroscopy (XPS) and contact angle measurement; meanwhile, surface topographical changes are followed by atomic force microscopy (AFM). In addition, substantial attention was paid to the effect of annealing on the morphologic variations induced by phase separation and/or dewetting of the thin film. Moreover, the influences of the molecular weight, Aw, as well as the brominated degree, x%, on the sample surface are explored systematically, and the corresponding observations are explained in virtue of the Flory-Huggins theory, along with the dewetting of the polymer thin film.     

SYNTHESIS OF MACROPOROUSCOPOLYMER OF VCA AND DVB

1.INTRODUCTIONVinylacetate(VAc)isacommonandcheapmonomeLUsuallyitisusedtopreparelinearhomopolymerorcopolymeLHowever,becauseoftheusefulestergrouppresentinVAc,italsoat'tractsthegreatinterestsofsomescientistswhoworkintheareaoffunctionalpolymers.Recently,alotofreporthaveappearedusingVAcasamainmonomertopreparecrosslinkedpolymersII~sl.ThesereportsmainlyfocustheinterestsonthesynthesisandapplicationoftheVAccontainingcrosslinkedpolymers.Noreportshavebeenfoundtostudythekineticsofthesynthesisofc…     

SYNTHESIS OF N,N''''-DISUBSTITUTED MONOTHIOXAMIDE AND STUDY OF THEIR REACTIONS WITH DIAMINES

In this paper, six N,N'-disubstituted aonothioxamides were synthesized and the reactions between these monothioxamines and diamines (1,2-diamino ethane and 1,3-diamino propane) were studied. Some new compounds were synthesized by using these reactions.     

SUBSTITUTION REACTIONS OF ALKANES——BROMINATION OF PENTANE,HEXANE AND HEPTANE

In the photo-bromination of pentane, hexane and heptane with bromine, N-bromo-diethylamine or N-bromo-succinimide, the authors found that the mono-bromo-pentanes, -hexanes and-heptanes obtained contain the isomers in the same proportions disregarding whatever brom-inating reagent is used. Among the isomers, 2-bromo-compounds occur in dominant quantitieswhile 1-bromo-compounds are nearly nil. The authors attributed these phenomena mainly tothe low mobility of bromine molecules but the rearrangement of the alkyl free radicals fromprimary to the secondary. Compared with chlorination, chlorine molecules are more mobileand combine with alkyl free radicals rather rapidly before rearrangement occurs, which makes1-chloro-isomer more abundant.