Objective To introduce an equipment of low-pressure control which is based on PIC16F877 microprocessor. The design flow and implementation methods are described. Methods The speed of motor was controlled to reach the set pressure value by PWM and the control requirements were achieved through human-computer interface. Results The setting value was quickly reached. Conclusion This device has interactive control and meets the requirements.

Aim To evaluate the vasorelaxant effect of two new chemical entities, J35242 and J35243, on iso-lated rat thoracic aorta rings as Rho-kinase inhibitors, and further to explore the underlying mechanisms of these two compounds. Methods Isolated rat thoracic aorta rings pre-contracted by KCl or norepinephrine ( NE) were used to evaluate the vasodilatory effect of J35242 and J35243 . Through the interventions of sev-eral tool drugs, the mechanisms of compounds concern-ing endothelium, K+ channels and Ca2+ were studied. Results J35242 and J35243 showed potent relaxant effect on both KCl and NE pre-contracted vessels, and exhibited partial endothelium dependency. L-NAME and Methylene Blue( MB) could influence the relaxant effect of these compounds. Meanwhile, the compounds could inhibit intracellular Ca2+ release and extracellu-lar Ca2+ influx, which indicated that the compounds might block the calcium channels to relax the vessels. In addition, the two compounds probably did not dilate the aorta rings through opening potassium channels. Conclusions J35242 and J35243 have vasorelaxant effects on vessels in vitro and the potency of J35242 is stronger than that of J35243 . The underlying mecha-nisms might be endothelium-dependent. Also the com-pounds might block Ca2+ channels, lowering intracel-lular Ca2+ concentration to relax the vessels.

Objective:To explore the application and preliminary evaluation of multidisciplinary rounds (MDRs) in the clinical teaching of urology.Methods:A total of 20 pediatrics medical students in the clinical medicine were selected as the control group, and the traditional single department teaching rounds were used. Another 20 clinical medical students in the same grade were taken as the experimental group, and MDRs were used. The teaching officer of urology served as the general ward round teacher, combined with nephrology physicians and imaging ultrasound physicians to conduct bedside teaching rounds, and the length of the rounds was about 60 to 90 minutes. Through the teaching evaluation form and the test scores, the effect of teaching ward rounds was evaluated. SPSS 21.0 was used for statistical evaluation data, and the unpaired t-test was performed to make comparison between groups. Results:In terms of theoretical test, the average score of students in the experimental group was (92.15±0.60), which was higher than that in the control group (90.05±0.71), and the difference was statistically significant ( P=0.030). In the experimental group, 95.0%(19/20) of the medical students affirmed the MDRs model, and 100% of them thought it was necessary to introduce this model in clinical teaching. Conclusion:MDRs are patient-centered, emphasize interdisciplinary cooperation, and are operable, which deepens the understanding of medical students on urological diseases, promotes the exchange of clinical teaching experience between urology and interdisciplinary research, and improves the quality of teaching.