Hu Jiming

Studies on a series complexes of copper (II), zinc (II), cobalt (III) with Schiff base derived fromd-glucosamine and salicylaldehyde

Copper (II) zinc (II) cobalt (III) complexes with the Schiff base derived from salicylaldehyde andd-glucosamine were synthesized. These compounds abbreviated as SG, CuSG, ZnSG, CoSG were characterized by elemental analyses, IR, UV-Vis,1H NMR and MS spectrum. ESR spectrum, magnetic susceptibility measured by Evans method for CuSG had also been done. It is suggested that the complexes in solution have pseudotetrahedral structure. It was found that SG would occur a photochemical reaction if a beach of 355 nm ultravisible light shone on its aqueous solution. The reaction was in further research.

Fast dating of Yongzheng copper coins in tsing empire by SEM-EDS

Twenty Yongzheng copper coins were fast dating by X-ray energy dispersive spectrometer with scanning electron microscope (SEM-EDS) according to official ingredient. The 20 coins were classified in two groups according to the results. Group 1 represents the coins minted before AD 1 728 and group 2 represents the coins minted after AD 1 728. At concentration range (0.00%–5.13%), the distribution of lead is not homogeneous in the coins, and the largest diameter of lead inclusion is less than 15 μm. The official fineness degrade is supported.

Appearance of liquid crystals in acupuncture points

Liquid crystals of biomolecules occur ubiquitously in biological systems, and to study the physiological mechanism of acupuncture, methods involving the detection of liquid crystals have been introduced. It is revealed that liquid crystals appear in the acupuncture point Zusanli 15 min after the appropriate stimulus in the acupuncture point Jiexi, which is located on the same meridian with Zusanli according to the Meridian Theory of Chinese Medicine, whereas liquid crystals are rarely observed in the points beside the Zusanli in the same condition. Subsequent studies on the composition of the liquid crystals detected, using energy dispersive X-ray analysis and histochemical analysis, suggest that the liquid crystals consist of proteins and perhaps phospholipids. The results show that these biomolecules, which are accumulated in the extracellular fluid of the acupuncture point, may function in the acupuncture effects, and moreover that liquid crystal detection can serve as a simple method to start studies of such complicated physiological phenomena.

Activities of liquid crystals in acupuncture points

The theory of Meridians is an important part of Traditional Chinese Medicine. Modern science should play its role in analysing and making clear the mystique of the theory. The relation between the activities of liquid crystals in acupuncture points and the regulative actions of Meridians was studied in this paper. The results showed the intimate intrinsic association between them.

Detection of human fibrin by immunological piezoelectric quartz crystal microbalance technique

The detection of human fibrin has been performed by immunological piezoelectric quartz crystal microbalance technique. Anti-fibrin antibody was immobilized onto the gold electrodes of a 9 MHz AT-cut piezoelectric quartz crystal with bovine serum albumin adsorption, followed by glutaraldehyde cross-linking. The antibody-bound crystals had good response to human fibrin in the concentration range of 10−4∼10−1g/L. The sensor system had good selectivity. The crystal could be regenerated nearly 10 times without detectable decrease of sensitivity.

Detection and response mechanism of CN− using Ag2S coated piezoelectric crystal sensor

A new method of determination of trace CN− in water was proposed. A thin film of Ag2S was electrochemically deposited on both sides of a silver coated piezoelectric crystal. The Ag2S−Ag films can react with CN− selectively, which causes the frequency shifts of the plezoelectric crystal. The frequency shifts are proportional to the concentration of CN− in the range of 10−6≈10−3 g/L. XPS experiments indicated the sensing film was Ag2S−Ag. A coordination complex Ag−CN− was formed when Ag2S−Ag film contacted with solution containing CN− ion. A response mechanism was proposed based on the XPS data.