The CIDEP of transient radicals produced by pulsed laser irradiation in some typical systems in the presence of constant-linear gradient magnetic field have been investigated by time-resolved ESR method. It is found that the space-resolved and space-time-resolved two-dimensional CIDEP of the studied systems could be obtained respectively with the aid of time-resolved ESR and ESI techniques.

In order to understand the simultaneous interactions of nitric oxide and reactive intermediates derived from ethanol in the blood stream and liver within our human body, we chose ethyl nitrite, a compound synthesized from ethanol and sodium nitrite at neutral pH value, equivalent to physiological conditions, to study the radical intermediates during photolysis within the ESR,cavity with various light power sources. Under a two-photon Chemical reaction pathway, three isomer radicals were formed and characterized by their ESR spectra. The intermolecular formation of these isomeric radicals and the unequivocal detection of two diastiomeric, two strongly intramolecular hydrogen bonded di-α-hydroxyethyl nitroxide radicals are of considerable interests by the investigation of dynamic alternate linewidth variations of the nitrogen isotropic hyperfine splittings.
Different kinetic flow experimental studies indicated one photon process for the formation of ethoxyl-ethyl nitroxides. Under a more intense light source, from the orbital interactions and correlation diagrams, the homolytic α-cleavage reaction similar to the n,π^* states of ketones (so-called "Norrish Type I" reaction) is initiated by the absorption of a photon to promote another n-orbital electron mainly on the oxygen atom of alkoxy group into the electrophilic half-filled π^*-orbital. Two-photon process will generate two (d,l and meso form) di-α-hydroxyethyl nitroxides.
The potential surfaces of the rotations of two methyl groups in both isomers were studied by the charm software. Due to van der waals interactions, the two methyl groups arehighly hindered rotated with approximately 150 kJ/mol in planar structure of the meso form of di-α-hydroxyethyl nitroxide, where the two methyl groups in the d,l form is about 3.3kJ/mol. The assignment of the β-proton hyperfine splitting constants of the two isomers are based on molecular models and McConnell's equation. Their production rates are asymmetrical in solution with 60% for meso-form and 40% for d,1-form. Based on the alternate linewidth effects of the nitrogen hyperfine splittings, the jump rates of the two hydroxyl protons in the planar di-α-hydroxyethyl nitrokides are estimated to be about l0^-ll s.

Based on the measurements of T₁ relaxation time of cerebellar dentate nuclei, we determined the best parameters of a gradient echo MRI sequence for functional imaging of cerebellar dentate nuclei.With the sequence we performed functional MRI of cerebellar dentate nuclei in a normal volunteer.The average increase of signal intensity was 20% during activation state compared with that in resting state. And there was no overlap in signal intensity between resting state and during hand toy matching task.

In this paper,a time resolved ESR technique has been used to study the chemically induced dynamic electron spin polarization effects of some short-lived radicals produced by the UV irradiation of benzophenone and some typical kinds of amines. The reaction mechanisms derived from this new techniqne are compatible with the static ESR method.

Nitrogen oxide reaction with humic substance was studied by using laser magnetic resonance. Humic substance is an important earth surfacc substance. Nitrogen oxide is one of mian pollutants.Studying their reaction lets tls know the earth surface substance interacting with atmospheric substance. The earth surface enviroment can eliminate pollution itself in some extent. 85% of NO₂ disappeared due to the reaction of NO₂ with humic acid. 90% of NO₂ disappeared due to the reactronof NO₂ with fulvic acid. 30% of NO was disappears during the reaction of NO with humic aicd. 33% of NO disappears when NO reacted with fulvic acid, at the same time humic substance is oxidized and nitrified, yielding organic-mineral fertilizer. This data is useful for dealing with industrial waste gases.

Metric Matrix Distance Geometry is an algorithm used in the three dimensional structure calculation of macromolecule. In this paper, its theory and application was discussed, the original SYBYL procedures were modified using SPL language. Comparison was made for the results of our experiment with DIANA and DISGEO. Besides, a proposal about the triangular constraint rule was proposed.

Co₃O₄, CeO₂ and Cobalt cerium mixed oxides catalysts were prepared by sol-gel method. The properties of the catalysts used for catalytic oxidation of p-cresol to achieve selectivity p-hydroxyben-zaldhyde were investigated. It's concluded that the activity and the selectivity of Cobalt cerium mixed oxide is the best. By using electron paramagentic resonance (EPR) method, the oxygen adsorbed or desorbed on three catalysts, and the action contacted with p-cresol in controlled-atmosphere have been investigated respectively. The EPR results confirm that a signal with 3-g values (2.003~2.048) comes from the species of surface adsorbing oxygen, and that they can be assigned to superoxide species O₂^- chemisorbed on the samples. The species O₂^- is the catalytic active one. Its concentration and complex state correlate with the catalytic oxidation activity and the selectivity of the catalysts.

This paper deals with the studies of 2D NMR spectra of disaccharidc moiety of a flavonol-3-O-α-L-rhamnopyranosyl-α-L arabofuranoside from the leaves of Artabotrys hexapetalus. The interlinkage of the biose was determined to be α-L-rhamnopyranosyl-(1→2)-α-L-arabofuranose.A simple NMR criterion was proposed for flavonol-3-O-rhamnopyranosyl (1 → 2)-arabofuranoside.

The ³¹P NMR spectra of molybdenum dithiophosphate (MoDTP) prepared under various reaction conditions and after treatments are reported. The composition, variation and reaction mechanism of the components of MoDTP synthetic products are studied.

The magnetic properties of La_0.65Ba_0.35MnO₃(LBMO) thin film have been studied by use of Electron-Spin-Resonance (ESR) method, resonance magnetic field B_r of various angles θ_h were obtained from the anisotropic FMR spectrum, and from the calculated results of B_eff and γ the anisotropic constant K of the sample was also evaluated by use of its saturation magnetization M_s.

The selective excitation NMR technique with Gaussian soft pulse has been used to record one-dimensional antiphase magnetization spectrum. The antiphase spectrum can be employed further to accurately measure J coupling constant by combining J-Doubling method. This measurement of J coupling constant is suitable particularly for overlapping multiplets and those with large spectra llinewidth and small coupling splitting.

The ESR spectra of liquid samples which are acquired by ASPECT 3000 of Bruker ER-200D ESR spectrometer are transferred to IBM PC/XT. The software ESRSIMU running under DOS is programed simulating experimental ESR first-order spectrum of either mono-or multi-radical systems in solution. ESRSIMU is a fast, easy-to-use programme which allows both experimental and calculated ESR spectra to be viewed on screen at the same time. The relative concentratioll ratio of paramagnetic species contained in systems can be evaluated by simulation of multi-radical systems. In comparison with Bruker EPR 3002, the simulation of single radical executed by ESRSIMU is ca. 100 times faster.

A NMR method for measuring selective homonuclear NOE effect under spin-locked conditions,called 1D ROE difference spectroscopy, was proposed. This technique provides a single and fast way to obtain NOE in complex overlapping spectral regions, and is particularly suitable for the molecules which have a motional correlation time τ_c near condition ωτ_c=1, where ω is the angular Larmor frequency. The 1D ROE spectrum obtained show clear lineshapes and good resolution. The dispersive signals commonly encountered in the conventional NOE difference spectra are much less pronouned in the 1D ROE spectra obtained by this technique.

^3lP NMR spectroscopy has been used to study dynamic aspects of the metabolism of phosphorus-containing compounds in isolated hearts since the late 70 s. The ³¹P NMR spectrum not only identifies phosphorus-containing compounds which are present in high concentration, namely adenosine 5'-triphosphate (ATP), creatine phosphate (PCr), and in-organic phosphate (P_i), but also provides information about their chemical environment(including pH and magnesium ion) and intracellular distribution. The method is quantitative and nondestructive, thus permits sequential observations of the myocardial metabolism and concurrent measurements of mechanical function of isolated hearts.Using saturation-transfer techniques, it is also possible to determine rates of creatine kinase and adenylate kinase in the intact heart. This review describes the NMR experiment and kinds of information the ³¹P NMR spectroscopy provides for isolated and perfused hearts from recent references.