Chinese bayberry fruits are used as a folk medicine to cure diarrhea. However, the active compounds have not yet been reported. We found that bayberry fruit extract showed significant antibacterial activity against Salmonella, Listeria, and Shigella, and the minimal inhibitory concentration (MIC) ranged from 2.07 to 8.28 mg/mL. Positive relationships were found between the antibacterial activity and the total polyphenol (r = 0.88) and flavonoid contents (r = 0.92) of samples using different extraction times. The active compounds showed green or blue fluorescence under UV light using the bioautography method and were purified using a polyamide column. The fraction F1 with the most activity was comprised of flavonoids, which included cyanidin-3-O-glucoside, myricetin deoxyhexoside, quercetin-3-O-glucoside, and quercetin deoxyhexoside, and it also possessed an antidiarrheal activity (p < 0.10) at 80 mg/kg in mice. These findings provide scientific evidence for the antidiarrheal function of bayberry.

This work studied the cushion efficiencies of aluminum foam and metal rubber as the cushion materials for microaccelerometers under shock load. A series of shock experiments were carried out to test the performance of these two materials. Preliminary results indicated that aluminum foam and metal rubber have different energy absorption mechanisms, and both of them have excellent energy absorption capability, which can effectively cushion the effect of shocking pulse peak and suppress the high-frequency vibration noise. Aluminum foam and metal rubber are believed to be promising cushion materials for microaccelerometer.

In this paper, an integrated 3-axis MEMS accelerometer was analyzed. Because of asymmetrical structure, z-axis sensing element, which was imbedded in the proof mass of lateral accelerometers, had large mechanical coupling. Simulation result showed that the cross talk in z-axis was as high as 64.3%. To solve the problem, a fully symmetrical structure with vertical springs was adopted in z-axis sensing element. The movement of z-axis was linear vertical displacement instead of torsional displacement. Simulation results showed there was no obvious cross talk in z-axis sensing element.