some unusual time course patterns of magnetic resonance responses in human brain to finger movement were found, in which large relative pixel intensity changes were observed,especially around the locations of macroscopic vessels and cerebrospinal fluid.

Dealuminated Y zeolites after mild steaming and (NH₄)₂SiF₆ treatments were studied by ²⁹Si,²⁷Al MAS NMR, ²⁷Al-¹H cross polarization MAS NMR and 2D nutation NMR. ²⁹Si MAS NMR shows that the Si, Al framework distributions of ultrastable Y zeolites and Y zeolites dealuminated by (NH₄)₂SiF₆ isomorphous substitution are different, even if they have almost the same framework Si/Al ratio. The reason is due to their different dealumination experience. Y zeolites with high Si/Al framework ratio can be obtained by a coorperation of isomorphous substitution and hydrothermal dealumination. Based on ²⁷Al MAS NMR, ²⁷Al-¹H CP/MAS NMR and 2D nutation ²⁷Al NMR observations, four aluminuous species, i.e. framework tetrahedral Al(AlFT),distortcd framework tetrahedral Al(Al^FDT), penta-coordinated non framework Al(AlNFP) and non framework octahedral Al(Al^NFO), in dealununated Y zeolites are supposed Si/Al frame ratios of dealuminated Y zeolites determined by ²⁷Al MAS NMR simulations are in good agreement with whose results of ²⁹Si MAS NMR

An algorithm was developed to calculate protein solution conforniations from 2D NOESY intensities. With the complete relaxation matrix analysis program MARDIGRAS the H-H atom distance constraints are evaluated. With the distance geometry program DISMAN the three dimensional structures of proteins are calculated which are refined further by the restrained molecular dynamics program r-MD and the energy rninimization program r-EM. With the CORMA program the NOESY intensities of the calculated structures are simulated to compare with the experimental NOESY intensities. Through a series of calculations and refinements the protein conformations arc obtained finally. The algorithm has been tested with the crystal structure of BPTI tresidues 1~30) and shown to be successful and practical.

Four cobalt compounds containing a novel structural unit[Co₃(SS)₃(PR₃)₃]:Co₃(bdt)₃(PBu₃)₃(Ⅰ),Co₃(tdt)₃(PBu₃)₃(Ⅱ),[Co₃(bdt)₃(PPh₃)₃][CoBrt(dmf)](Ⅲ)and[Co₃(edt)₃(PEt₃)₃]₂[Co₂Cl₄(Et₂SO₂)₂](Ⅳ)(bdt=1,2-S₂C₆H₄^2-,tdt=4-Me-1,2-S₂C₆H₃^2-,edt=SCH₂CH₂S^2-) were studied by means of magnetic susceptibllity and ¹H NMR. The results indicate that they are paramagnetic compounds with antiferromagneticcoupling among the paramagnetic metal co balt atoms. Herein the relation betweentheir magnetic characteriZation and molecular structure is discussed.

¹⁴N NMR was applicd to the study of the pH-dependent structures of histidine in aqucous solutions. ¹⁴N spin-lattice relaxation times(T₁) were measured by inversion-recovery method.According to the spectra and the T₁ data,different structures of histidinc in aqucous solutions were determined.

A series of SAPO-5 molecular sieves have been synthesized by varying the aging time and silicon source, their structures have been characterlzed by XRD and ²⁷Al MAS NMR spectra. The state of the template in molecular sieves were studied by ¹³C CP MAS NMR. The results reveal that when using silicon gel as silicon source, prolonging aging time can improve the structure of SMO-5 within a linlit of 48 h, when beyond this limit,the produced SAPO-5 is gradually decomposed and some of them is changed into SAPO-34 with a chabazite structure. However, when using Si(OEt)₄ as silicon source, prolonging aging time can improve the structure of SAPO-5 and make Si occupy the framework in the crystallization time of 0 to 72 h. These differences may result from that SiO₂ gel has a higher activity than Si(OEt)₄.The results of ¹³C MAS NMR of the tcmplate in SAPO-5 show that SAPO-5 has some influence on the state of the template. Probably for the methyl group in Et₃N existing at the gate of the pore,the framework can exert some effect on it,so its delay time is different from that of the methylene group connected with nitrogen. Its NMR line intensity decreases with the crystallinity of SAPO-5 and can be used as a pro be to study the crystallinity of SAPO-5.

Natural abundance¹³C NMR spectra of more than thirty natural Pachysandra alkaloids and their derivatives were recorded. The assignments were made with the help of DEPT technique, based on chemical shifts arguments and comparison with values reported for other related steroidal alkaloids.The application of¹³C NMR spectral analysis for the structure elucidation of Pachysandra alkaloids is discussed.

N-14 relaxation times of some amides(caprolactam,N,N-dimethy lacetamide,acrylamlde) in water or deuterated water solutions were measured by inversion-recovery technique. The solvent isotope effects on nuclear quadrupolar relaxation times were discussed. The rcsults show that under infinite dilutions, the kinetica of these solute moleculcs are still controlled by the solvent molecules although they have different molecular weights.

A Series of nuclear magnetic resonance (NMR) spectra of Agriophyllum sguarrosum L, Moq.and Salsola ruthenica Iljin in whole seeds were obtained by using cross polarization magic angle spinning(CP MAS)technique,Spectra of seeds obtained from two types of desert plant show that protein and Carbohydrate content in them are different.
Cell wall spectra in seeds of Agriophyllum squarrosum L. Moq were dominated largely by resonances from Xyloglucans,while in spectra of Salsola ruthenica Iljin seeds was derived mainly from galactomannan.

¹H NMR spectra of acetoxime have been measured as the function of the molar concentration of acetoxime in solvent of carbon tetrachloride,chloroform、dichloromethane、benzene and toluene.It has been found that the chemical shifts of the resonance absorption lines of the two methyl groups in acetoxime and of methine halide move upfield gradually as the molar concentration of acetoxime increascs, but the resonance absorption line of hydroxyl group in acetoxime movc downfield gradually. The absorption line of the two methyl groups in acetoxime shows a singlet.
In the solvent of aromatic hydrocarbons, the resonanee absorption lines of the two methyl groups in acetoxime and of aromatic hydrocarbons move downfield gradually as the molar concentration of acetoxime increases, and the absorption line of the two methyl groups in acetoxime splits to a doublet. At the same time, it has been found that all the chemical shifts show linear relation with the molar concentration of acetoxime.

A new method that the O₂^· was produeed by Na₂O₂ in DMSO/H₂O has been reported in this paper. The visible O₂^· signal can be directly detected by ESR. The conditions of the reaction and.characterization of O₂^· signal were studied. Scavengingeffect of superoxide anion was investigated with tea polyphenols etc. It is shown that this is an advisable method to produce O₂^· radical and could be used to look for the new O₂^· scavenger.

The ring structures in the ketals obtained from the reactions of ketones with atactic PVA with different molecular weights have been studied by ¹³C NMR, The concentrations of different ketal rings were calculated and compared with the results de-termined by¹³C NMR, their difference were also discussed. It was found that there ex-ists a critical degree of polylnerization(molecular weight) for PVA to produce certain amount of ketal rings.

The ¹³C chemical shifts of 25 new 2,4,6-triaryl-N一substituted pyridinium tetrafluoroborates have been completely assigned by application of ¹³C-¹H COSY,2D-J resolution spectra,selective proton decoupling and DEPT technique. The influential factors of chemical shifts have been discussed.

We use thc theory of resonance of "molecule hole" to explain the problem of the number of proton distribution in the ¹H NMR spectrum of malachite green molecule.

The software and hardware system was developed for use with the German BRUKER ANALYTISCHE MESSTECHNIK COMPANY'S EPR Spectrometer model ER-200D-SRC. The system was used to control spectrometer during magnetic sweeping,collect data from spectral scans in single-scan and multiscan modes, data analysis and manipulation, output data to the spectrometer x-y recorder and print data to printer,The hardware is based on IBM PC/386 computer and two interface modules, one of which is commercialized 12-bit A/D and D/A interfaced, and the other a designed digital I/O control card with a general programable interface IC INTEL 8255 being it's main body.The two cards can be inserted into PC's extension socket respectively. The software,written in C language, is characterized by chinese character menu display,structured and modularized program and real-time working.It has good user's interface and easy operation, The system has recovered and im-proved the whole funtion of the original spectrometer and has certain value for development.