[en] The ENDOR spectra of the ¹⁵N-⁶³Cu-HAP complex measured in 5:1 DMSOEtOH solution at 20 K were studied by orientation selection technique. The anisotropic super-hyperfine coupling tensor of ligand ¹⁵N nucleus and the super-hyperfine coupling constant of several unequal values ¹H nuclei were accurately determined. The result shows that in previous paper the method of spectral analysis is right and the data is reliable

[en] The ¹³C NMR of lanthanide α-alaninate coordination compounds have been studied by XL-200 NMR spectrometer under weakly acidic condition. The chemical shifts obtained are separated into coordination compound formation shift, contact shift and pseudo-contact shift by the method of 'Independent Structure'. According to the contribution of different shifts, it is revealed that 'tetrad phenomenon' and 'gadolium break effect' of lanthanides also appear in its magnetic properties. The structures of coordination compounds are simulated by computer based on the pseudocontact shift. Some interesting results are obtained and discussed

[en] Objective: To assess the value of bi-exponential apparent diffusion coefficient of multi-b factors in super-acute cerebral ischemia of rats. Methods: After unilateral middle cerebral artery ligation (MCAO) on fourteen SD rats, T₁-, T₂-, diffusion-weighted imaging (DWI) and intra-voxel incoherent motion (IVIM) MR Imaging were performed using a 3-T MRI system at 0.5 h, 1.5 h, 2 h, 3 h and 4 h. The IVIM sequence was applied using a biexponential model with 12 b factors between 0 and 4000. We compared the mono-ADCs, fast-ADCs and slow-ADCs of the bilateral cerebral cortex and basal ganglia. The rats were then sacrificed and the brain infarct size was measured using TTC stain. Results: The reduction of mono-DCs and slow-ADCs of the infarcted cerebral cortex and basal ganglia with time after MCAO was not statistically significant from that of the contralateral side (P > 0.1). Fast-ADCs of the infarcted cortex and basal ganglia were significantly (P < 0.05) higher from those of the contralateral side at 0.5 h to 1.5 h and lower at 4 h later stage after MCAO. Conclusion: Bi-exponential fast-ADC may be attributed to the perfusion effect in multi-b factor diffusion-weighted imaging and may reflect the microcirculation change of super-acute brain ischemia in vivo. (authors)