AIM:To study the effects of inhalation of aerosolized low molecular weight heparin(LMWH)and standard heparin(SH) on the clotting time and bleeding time in guinea pigs and mice.METHODS:Guinea-pigs and mice inhaled aersolized LMWH and SH for 7 days,and the clotting time in guinea-pigs and tail bleeding time in mice were observed.RESULTS:Compared with vehicle,LMWH 800IU/L,400IU/L and SH 800IU/L,400IU/L had no significant effects on the clotting time in guinea-pigs and tail bleeding time in mice(P>0.05);There were no significant differences between LMWH 800IU/L,400IU/L and SH 800IU/L,400IU/L(P>0.05).CONCLUSION:Inhalation of aerosolized LMWH and SH had no significant effects on clotting time and bleeding time in animals.

Objective:To design a Visual TFT-based SF 6 gas measurement system. Methods:Based on Visual TFT, an SF 6 gas measurement system is designed, including system hardware design and system software design. The system hardware mainly includes gas sensors, a Visual TFT display, a signal processing circuit, and a power supply circuit. The system software mainly includes data acquisition, data display, SF 6 monitoring system, and alarm program. The Visual TFT display is controlled by Keil code to display other parameters such as gas flow rate, concentration, and waveform, and calculate the error (? E). The measurement system extracts the gas flow rate and concentration data through the waveform graph and gets the change curve of functional residual gas volume (FRC) data. Results:The proposed Visual TFT-based SF 6 gas measurement system can detect SF 6 with an arithmetic mean value of concentration ? E of 8.906%, which is less than 10% of full scale and meets the design requirements. Conclusions:The Visual TFT-based SF 6 gas measurement system can monitor the concentration of SF 6 gas in real-time, which helps to control the release of SF 6 gas and reduce the impact of inert gas emission on the human body under test. At the same time, the system has an intuitive display interface and alarm function, which helps healthcare workers diagnose and treat lung and respiratory diseases more conveniently and quickly, and improves the efficiency and safety of healthcare workers.

Multidrug resistance (MDR) mediated by ATP binding cassette subfamily B member 1 (ABCB1) is significantly hindering effective cancer chemotherapy. However, currently, no ABCB1-inhibitory drugs have been approved to treat MDR cancer clinically, mainly due to the inhibitor specificity, toxicity, and drug interactions. Here, we reported that three polyoxypregnanes (POPs) as the most abundant constituents of