A new method is proposed in this paper, which is photoacoustics laser magnetic resonance (PALMR) in gas phase. PALMR spectrum of NO₂ was observed for the first time in light intensity modulation and laser cavity freqnency modulation. The method has high sensitivity, especially, in low density and high pressure. Although the experiment was done in mid-infrared, this method may also be suitable for far-infrared.

By ESR study a size effect in nanostructured NiAl samples was found. There is no ESR signal in polycrystalline bulk NiAl alloy which only has very weak Pauli paramagnetism. The ESR signal of nanostructure NiAl (n-NiAl), whose grain size is about 8.6nm and T_C is 124K, is weakelled with the increase of temperature. When the n-NiAl.was anneled at 550℃ and 707℃, the average grain sizes of the samples are 12nm and 21nm respectively, and their ESR signals are stronger, and both samples can be attracted by a permanent magnet. There is a nonmagnetism-magnetisnl transition between polycrystalline NiAl alloy and nanostructure NiAl.

The application of pulsed field gradient NMR to the measurement of diffusion in solid samples met several difficulties. A strong magnetic field oscillation at the sample probe was observed in an electromagnetic NMR spectrometer with an external lock umt. A pulse sequence is proposed to be useful in the diffesion measurement in polymer gel samples.

To assess the myocardial effects of verapamil (Ver) pre-treatment against is-chemia-reperfusion injury, ³¹P NMR was used to sequentially follow the time courses of high energy phosphates (HEP) contents and intracellular pH(pH_i) of the rat myocardium before, during and after total ischemia. After 30min of equilibration, the perfustion of isolated hearts was stopped for 30min and subsequent reperfusion lasted for 30min at 37℃.Ver (0.2μmol·L^-1) was added to the perfusate throughout the experiment. Ver induced a more complete restoration of coronary flow following reperfusion. ³¹P NMR determination suggested metabolically beneficial effects induced by Ver administration. Phosphocreatine (PCr) became undetectable after 10min of ischemia in control hearts, but remained at 20%of its preischemic levels in Ver group. Adenosine triphosphate (ATP) decreased more slowly in treated than in untreated hearts during ischemia, with the end-ischemic levels of ATP were 53% and 34% respectively. Myocardial ATP was not replenished afer reperfusion in both groups, but Ver induced a significant (P < 0.05) higher recovery of PCr on reflow.PCr/P_i (inorganic phosphate) ratios were very significantly (P < 0.01) higher for treated hearts than for control hearts during both the first 10min of ischemia and the reperfusion stage. Ver was also found to significantly attenuate the acidosis during ischemia and prevent the appearance of very acidic areas of the myocardium after reperfusion.

A New Kauran compound was isolated from the herbs of Siegesbeckia pubascens, named as 17-isobuthyloxy-18-hydroxy-kauran-19-oic acid, all the ¹H and ¹³C NMR chemical shifts of the com-pound were assigned by ¹H-¹H COSY, ¹³C-¹H COSY, NOESY, HMBC, 2D NMR techniques. Its relative configuration is discussed by NOESY, The connection position of acyl radical in the structure was assigned by HMBC.

The cohesive interaction among polymer chains in methyl methacrylate-naphthyl ethylene copolymer solution was studied by NMR relaxation. ¹³C NMR relaxation times of methyl methacrylate-naphthyl ethylene copolynler in its good solvent deuteriochloroform were measured at different temperatures. The T₁ values of individual carbon atoms of methyl methacrylate-naphthyl ethylene copolymer in solution increase as the temperature increases, which is characteristic of the NMR relaxation of small molecules in solution. ¹H NMR transverse relaxation of protons attached to carbons of this copolymer shows biexponential behavior, which corresponds to two states of the copolymer. The fast relaxating conponent decreases with increasing temperature, corresponding to the disentanglement of cohesional entangled chains. When tempreature becomes even higher, this component of the main chain start to increase again, this shows that new entanglements occurs among copolymer main chains. Results also show that in this copolymer system, the interlocking interaction of the side group-naphthyl rings is scarce.

The alternating cyclocopolymer of DVE-MA possesses a wide spectrum of biological activities.including antitumor. Recent research on the structure of a variety of cyclocopolymer has raised a question about the ring structure of this cyclocopolymer. In this paper we report for the first time 2D ¹H-¹H COSY. ¹-¹³ C COSY and J-resolved spectroscopy to elueidate the 400MHz NMR spectrum of eyclocopolymer of DVE-MA,combined with the PC-MOD calenlation of coupling constant and minimal energy in comparison with model compounds.We discussed the relation of stereochemistry of the copolymer to energy.

By comparing three pulse sequences STE LED LED-BPP, one is selected, which is the best to measure the self-diffosion coefficient of surfactant solution, in which there exists coupling effect. Self-diffusion coefficients of a series of sodium dodecyl sulfonate D₂O and D₂O-NaCl solutions with different concentrations were measured. The aggregation behavior of this surfactant in aqueous solution is thus deduced.

Complex PdCl₂[(PPh₂)₂CHCl] has been prepared by treatment of Pd(OAc)₂ with dppm in solvent CH₂Cl₂. IR,¹H NMR, ³¹P NMR, elemental analysis, EDS data are given. The molecular structure of PdCl₂[(PPh₂)CHCl] has been determined by single crystal X-ray diffeaction. The reaction mechanism is tentatively proposed and discussed. Radicals.PPh₂ and other radicals were trapped by PBN. This reaction was proved to be a free radical reaction by EPR-ST method. The solvent CH₂Cl₂ participated in the reaction.

In order to explore the possibility of MRI in the noninvasive evaluation of gallbladder bile composition T₁-weighted spin-echo exial abdominal MR image at 0.5T and gallbladder bile compositon were obtained in 38 individuals (12 with acute uncomplicated cholecystitis and gallbladder gallstones, 1 patient with suppurative cholecystitis, 2 with acute hemorrhagic cholecystitis, 14 with chronic cholecystitis and gallbladder stones, 5 with gallbladder polyps, 4 with obstructive jaundice) in fast stage. The results show that the concentrations of cholesterol (p=0.014), fatty acids (p=0.001) and iron (p < 0.001) in the gallbladder bile in fast stage were significantly and negatively associated with liver-gallbladder signal intensity ratio on the T₁ weighted image (TR/TE=620/25 ms). No significant association was found between the liver-gallbladder signal intensity ratio and the concentrations of total protein, total bilirubin, Na⁺, K⁺, Cl^- and Mg⁺⁺. We conclude that the liver-gallbladder signal intensity ratio on the T₁-weighted RM image can reflect gallbladder bile composition. The strongest determinants of the liver-gallbladder signal intensity ratio are the concentrations of cholesterol, fatty acids and iron.

The influence of chemical shift anisotropy on 2D NMR nutation of quadrupolar nuclei with half integer spin is considered in the present work. Hamiltonian matrices during the period of evolution time of 2D NMR nutation is diagonalized with numerical method.Powder average is made with the method of tent. The spectra of 2D NMR nutation for spin I=3/2, 5/2, 7/2, and 9/2 were obtained. Experimental results are in agreement with theoretical calculations.

Polyaminocarboxylate ligands were synthesized by the reaction of diethylenetriaminepentaacetic dianhydride with glycol monoether, and their Gd(Ⅲ) complexes were also prepared. The structures of the ligands and complexes were confirmed by IR, ¹H NMR spectra and elemental anaJysis. The relaxivity of these Gd(Ⅲ) complexes were investigated and the data indicated that three of them showed higher relaxivity as compared to Gd(DTPA).

The ¹³C NMR spectral data of 14 substituted quinolines were reported and their structures were determined by IR, MS and ¹³C NMR spectra. The ¹³C NMR chemical shifts of 14 compounds have been assigned. The influencing factors of the chemical shifts were discussed.

This paper presents a covalent model to the calculation of the g factor in ZnS:Co²⁺ crystal, in which the contribution due to the s. o. coupling of ligand ions is induded. The odculated results are in agreement with the experimental data, then, the problem that calculated value of g factor is smaller than experhaental finding kas been solved. In the meantime, we also analyzed tke spectra and the g factor of ZnS:Co²⁺, the analysis suggests that some of the d electrons of transition metal (TM) ion in ZnS:Co²⁺ are located at anti bonding orbital and the others at bonding orbital.

This article studies the solvent effect of benzene on the NMR sprctra of title compound in carbon tetrachloride. It has been found that the chemical shifts of the resonance absorption lines of the two methylthio groups in title compound and that of benzene in the mixed solvent move upfield gradually,as the mole fraction of benzene in the mired solvent increases. The rates of upfield shifts of the reso-nance absorption lines of the two methylthio groups are different, and as the mole fraction of benzene increases, the ASIS increases. All the chemical shifts and ASIS show linear relationships with the mole fraction of benzene in the mixed solvent. It has been tried to use the solvation to explain the ASIS effect of benzene on title compound.