The stabilizing effect of trace amount of selenium on erythrocyte membranes was studied by means of spin-labeing technique in this paper. The evidences showed that, compared with in selenium-free medium, the ratio of weak immobilizing components of the labeed erythrocyte membrane proteins to that of strong ones (W/S) decreased and flexibility coefficient (F) increased by addition of selenium and incubation at 4℃ for a period of time, which suggested that the tetramers and oligomers of spectrins increased. The mild denaturing experiment by using Triton X-100 at 0℃ for one hour indicated that the selenium have inffunce on the proteins of erythrocyte membranes. The stabilization are neither due to electric interaction nor due to covanlently cross-linking. The configuration variation and subsequent transformation of dimers of spectrins to tetramers and oligomers is probably the main process leading to protection of the membrane skeletons from decomposition. More

The EPR spectra of CuCl₂ and a series of CuCl₂/γ-Al₂O₃ samples have been compared, and fitted using the theory formula of EPR powder spectra. The results suggest that there are two distinct coordination sites for Cu²⁺ ions in the samples of fresh catalyst at least, which are both different from that of Cu²⁺ ions in CuCl₂ or in CuCl₂· 2H₂O. The EPR parameters obtained by fitting show that one of them might be due to the site with plenty of coordinate O^2-, and the other might be due to the site which is rich in coordination Cl^-. Their propotions varies with the Cu contents in the samples. In the catalyst with low CM content, Cu²⁺ ions prefer to go into the cavities formed by O^2- coordination-unsaturated on the surface of γ-Al₂O₃ in monolayer, and to separate from each other while dispersing. The intensity data of EPR are in agreement with this fact also. But in the catalyst with higher Cu load, which has higher catalytic activity, including its specific activity, much more Cu²⁺ ions exist in Cu-Cl coordination manner. This fact implies that Cu²⁺ ions with more Cl neighbors in the catalyst might be correlative to catalytic activity of oxychlorination.

The reaction processes of ketones in the presence of Nitrogen or Argon by microwave discharge have been studied with the combined technique of ESR and gas chromatography. The results show that free radical reactions initiated by excited N₂^* (Ar) or N₂^+* (Ar^+*), which were formed in microwave discharge, are the fundamental processes. Reaction mechanisms are discussed.

Single crystals of monoclinic aluminum acetylacetone were grown by evaporation of saturated solutions and the structure was determined by x-ray single crytal diffraction. Angular variation of EPR spectra for chromium-doped aluminum acetylacetone were investigated. A curve was gained by eigenfield method. Which is fitted with the experimental curve very well. The paramagnetic parameters obtained via this method are:
D=0.587cm^-1 E=-0.0049 cm^-1 g_x=g_y=1.965 g₂=1.984

The CIDEP emission spectrom of P-benzosemiquinome radocal by photolysing P-benzoquinome was obtained experimentally with the highly time resolved ESR spectrometer.Using TM and RPM mechamisms,we invesigated the polarization of the radical and clculated the cahamcements V(I)=-0.66.and V(R)=0.2,the first order mention rate k_1,A=0.05/μs,the second order spin selective reaction mate β=0.02/μs,and the relaxation time T₁=T₂=2.3μs.

The chemical shifts of the ¹³C NMR and ¹H NMR spectra of eight atisane type diterpenes and one kaurane type diterpenc isolated from Euphorbia sieboldiana were assigned by their ¹³C-¹H COSY, ¹H-¹H COSY and ¹H-¹H NOESY spectral studies, and the difference of ¹³C NMR chemical shifts between atisane diterpenes and kaurane diterpenes was found, which can be used to distinguish the atisane skeleton from kaurane skeleton easily.

A multiple excitation pulse sequence capable of greatly enhancing signal intensity is proposed for the measurement of the central line of half-integer quadrupolar nuclei in solids. The resultant signal-to-noise ratio as well as the excitation bandwidth were studied with the aid of numerical calculation. The superiority of the suggested method is demonstrated experimentally with a mixture of 40% NaCl + 60% NaNO₂ powders.

DEPT and 2D NMR techniques including ¹H-¹H COSY, ¹H-¹³C COSY, NOESY and ¹H-¹³C COLOC were used to investigate the structures of two sesquiterpene alkaloids with polyester groups. It worth noted specially that ¹H-¹³C COLOC is a very powerful tool for the location of each substituent on the skeleton. The stereo structures were deduced from the coupling constants in¹H NMR and NOESY.

An EPR simulation program is described, which can be carried out in IBM-PC computer. The program was designed in Fortran 77 language, and could be easily improved. Because of the consideration of relaxation by W=a + bM₁ + cM₁², lineshape has been meliorated. The good result of test simulation shows that this program is useful to help analysing complicated EPR spectra.

The ¹H NMR spectra of 19 phenol compounds were analysed and studied here. The result showed that when intramolecular hydrogen bond is formed at the phenolic hydroxyl group the resonace of the para-aromatic hydrogen shifts to higher magnetic field. This shift is greater than that of the ortho-aromatic hydrogen. The diffence is about 0. 1ppm-0.3 ppm.