The chronic rat temporal epilepsy was induced by repetitive tetanus (60Hz, 0.4～0.6mA , 2s) to the apical dendrite region (ADR) in either CA1 or the dentate gyrus ( DG ) once a day for 6 or 8 days. T₂-weighted MRI (T₂-WI) measurements  and morpholog ical observations were performed on the tetanized rats. A resemble increase of MRI signal intensity in the lateral ventricle area was observed both in the ADR- tetanized rats and the DG-tetanized rats. There is an asymmetric T₂-WI ab normaliti es in the anterior MRI slices and ventral T₂-WI abnormalities contralater al to t he implantation side in the posterior MRI slices (1 mm posterior to the anterior  MRI slice). Morphological identification showed that there are the enlarged lat e ral ventricle and pathological ventricular chorodea plexus hyperplasia which cor respond to the MRI observations. The results suggested that the activation of DG or  ADR in an intrinsic hippocampal circuit may play the same role in epileptogenesis.

The influence of ruthenium dioxide on the photoinduced electron transfer and  photocatalysis character for cadmium sulfide superfine particle system by means of ESR method. Results show that it is obviously different from the case of si ngle CdS colloid system, in the presence of ruthenium dioxide, CdS/RuO₂ binary system can ef fectly enhance photocatalysis reactions of some substrates; but for other substr ates, their interfacial photoreactions may be prohibited obviously or completely , namely, RuO\-2 plays  a role of  negative catalysis. Therefore, under different conditions, the promotion and negative catalysis characters of the CdS/RuO₂ binary system are conducive to control and regulation for the interfacial photoreaction processes.

The quantitative relationship between the Electron Paramagnetic Resona nce（EPR）parameters (D, g_∥, g_⊥) and the local structure parameters of  Ni²⁺ in Al₂O₃∶Ni²⁺ crystal is established according to the sup erposition model and perturbation theory. The local structure for Ni²⁺ par amagnetic center in Al₂O₃∶Ni²⁺ crystal has been determined from EPR parameters of Ni²⁺ ions. The very large zero-field splitting parameter D and  anisotropic g factors(g_∥, g_⊥) of Ni²⁺ ions in Al₂O₃∶Ni²⁺ crystals are explained by considering the suitable local lattice distorti on. We obtain that the three O^2- ions above Ni²⁺ rotate 0.603° toward ［111］-axis while the three O^2- ions below Ni²⁺ rotate 0. 598°toward it. 

Electron spin  rosanence spectra are reported for low-temperature glassy  solution of Cr(Ⅲ)complexes ［Cr(ox)₃］^3- (1), ［Cr(bipy)(ox )₂］^- (2), ［Cr(phen)(ox)₂］^- (3) (ox=oxalate dianion, bipy=2,2′-bipyridine, phen=1,10-phenanthroline) and  powder of (NH₄)Cr(SO₄)₂ diluted in (NH₄)Al(SO₄)₂  (Cr³⁺∶Al³⁺ mol ratio of 1∶150)(4). Spin-Hamiltonian parameters a re determined. Complexes 1, 2 and 3 have approximately the same g(1.99) and zero-field splitting parameters D values (0.42 ～0.45cm^-1), but the E values are different. For Cr(Ⅲ) complexes 1, 2, 3, E=0.015, 0.05, 0.11cm^-1, respectively. These values should reflect changes of the intrinsic symmetry of transition metal ions in solution.

It is very important for natural gas exploration and development to study the NM R properties of natural gas in a low magnetic field. Few studies have been
reported on this subject mainly due to the restriction of high temperature and h igh  pressure. In this work, a home-made NMR instrument, which could bear both high temperature and high pressure, was developed. The magnetic field is 0.056Tesla. The NMR properties of natural gas from deep formation of Daqing oil field were ex plored. The relationships among relaxation time, hydrocarbon factor, temperat ure, and pressure were extracted, resulting in useful information in the application o f NMR logging.

This paper will give a description of an effective method that analyze s a mixture from the roots of Ampelopsis sinica with direct-coupled LC-NMR . Stop flow experiments were carried out. The main composition was determined as a re sveratrol tetramer Vitisin B by means of  ¹H-LCNMR and WETGCOSY.

Ovalbumin is a member of the serpin superfamily. It's reactive center loop (a pe ptide with 23 a.a. residues) locates between the residue 343 and the residue 366  in the  protein sequence. The nano probe is a new kind of ultra small volume probe base d on  magic-angle spinning technique. The related 2D NMR experiments were performed wi th small volume detecting technique using magic-angle spinning, and the NMR  resonances of the peptide were assigned.

Mordenite catalysts were studied by solid-state ²⁹Si and ²⁷ Al NMR. The relative d istribution of the Si and Al atoms in the framework and the framework Si/Al rati o were obtained by ²⁹Si MAS NMR, and the aluminum species were charact erized by ²⁷Al MAS NMR. 34.3% of the aluminum is lost from the structure fol lowi ng a calcination at 500℃, but only 10.1% of the aluminum became non-framew ork octahedral a luminum that is NMR visible, and 24.2% of the aluminum became non-framework alu minum that is NMR invisible. Possible mechanism of dealumination was suggeste d. After binding with Al₂O₃, the ²⁹Si MAS NMR spectrum is similar  to that of pur e NH₄-MOR, but the ²⁷Al MAS NMR spectrum is different from the simp le addition  of the ²⁷Al MAS NMR spectrum of NH₄-MOR and Al₂O₃. Short pulse length was used to quantify the ²⁷Al MAS NMR experiment, and ²⁷Al MAS NMR wi th various pulse widths (0.5μs, 2μs, 3.5μs and 3.9μs) were used to character ize aluminum sites. With the increase in pulse width, a sharp peak appears on a broad resonance at 0ppm, indicating that there are two different nonframework sites at 0ppm, the broad on e is d u e to octahedrally coordinated aluminum of Al₂O₃, and the narrow one may be some Al³⁺ cations, possibly arising from Al₂O₃ in the process of binding.

The cisapride is a new and effective stomachic, and can be taken orally. Solid c omplexes of cisapride with Eu³⁺ ion has been synthesized. UV, IR, fluo rescence spectra, thermal spectrum and scanning electron microscopic photographs of the complexc ompound have been studied. The coordination site and the complexing mechani sm have been studied by means of ¹H, ¹³C NMR.

The ¹H and ¹³C NMR chemical shifts of the title compounds 1～3 were assigned  in this article by using 1D and 2D techniques, including ¹H, ¹³C , DEPT, ¹H-¹H DQF-COSY, ¹³C-¹H COSY, COLOC and ¹H-¹H NOESY spectra. Alkyl groups show considerab le effects on ¹H chemical shifts of the benzene and ¹³C chemical  shifts of the d ioxolane. The shift parameters of methyl and propyl substituent effects on the ¹³C chemical shifts of dioxolane are as follows: 8.12(α), 5.7(β), -1.1(γ)a nd 11.57(α), 4.77(β), 0.17(γ), respectively. The stereo-structures of  the synthetic compound 2 and 3, which are widely used in agriculture as a  kind of pow erful pesticides and fungicides, were elucidated by ¹H-¹H NOESY exp eriments.

Naphthalimides  are important organic compounds used in the field of biolog y ,chemistry, medicine, etc. In this paper, the ¹³C NMR data of 4 new naphthal imides are reported and their structures were determined by ¹H,  ¹H- ¹H COSY, HMQC and HMBC methods. The ¹³C chemical shifts of all of the 4 compounds  ha ve been assigned. The factors influencing the chemical shifts are discussed.

The present article employs a piece of ADS804 (Burr-Brown, USA) Integrated C ircuit to design a high-speed Analog-to-Digital Conversion card, which is bas ed on  the ISA bus of the popular personal computer. Nuclear magnetic resonance spectra  obtained with the ADC are given. The application of high-speed ADC to the sim plified design of the NMR spectrometer is also discussed.

The simulation of shimming process is an important part of virtual spectrometer software. This article established a model for shimming simulation and implement ed it in C⁺⁺. A Windows program is written in Visual C⁺⁺ to demonstrate the use of the shimming class.

In light of   the CPMG pulse sequence , which is used to measure the transverse rel axation time T₂, and of  modified CRAZED pulse sequence, which is designe d to simultan eously measure the transverse relaxation time, T_2,n and self-diffusi on coefficient , D_n, of intermolecular multiple quantum coherences (iMQCs) for a highly p olarized  spin system with only one type of spin species, all kinds of factors, which will   affect the measurement of T₂、T_2,n（or D_n）, are analyzed. T he processing method of the expe rimental data and the optimization of the experimental parameter for the accurat e measurement of  T_2,n and D_n of iMQCs are discussed from the point of view of technique.