Apparatus for the measurement of the oxygen uptake of rats subjected to hypobaric hypoxia / 中国应用生理学杂志

<p><b>OBJECTIVE</b>To construct an apparatus for the oxygen uptake measurement of rats exposed to hypobaric hypoxia at different simulated altitude.</p><p><b>METHODS</b>The capacity of this apparatus was about 0.01 m3. It included animal experimental cabin, reference cabin, altimeter, altitude vertical velocity indicator, pressure difference inductor and oxygen compensator, low scale manometer, soda lime and calcium chloride, small fan, thermometer, circulating water system and vacuum pump. The oxygen uptake of the rats at 6 000 m, 4 000 m and 1 000 m simulated altitude was measured using this apparatus.</p><p><b>RESULTS</b>The oxygen uptake of the rats at 50 m, 4 000 m and 6 000 m simulated altitude was (24.4 +/- 2.1), (10.8 +/- 2.0) and (8.8 +/- 1.6) ml O2/(kg x min) respectively (average +/- s, n = 10). The oxygen uptake decreased as altitude increased.</p><p><b>CONCLUSION</b>This apparatus can be used to measure the oxygen uptake of the rats at different simulated altitude.</p>

Immunogenicity of new DNA vaccine encoding for hepatitis B virus core antigen / 中华肝脏病杂志

<p><b>OBJECTIVES</b>To observe immunogenicity of new DNA vaccine encoding for hepatitis B virus core antigen (HBcAg).</p><p><b>METHODS</b>A new DNA vaccine (pSW3891/HBc) encoding for hepatitis B virus core antigen was constructed using plasmid pSW3891 which can be used in human. Control and experiment groups of Balb/c mice were immunized with pSW3891 or pSW3891/HBc by gene gun. Anti-HBc in sera of mice was tested by ELISA (enzyme linked immune sorbent assay). Specific cytotoxicity of cytotoxic T lymphocyte (CTL) of mice was detected by LDH release assay.</p><p><b>RESULTS</b>pSW3891/HBc can express in 293T cell line effectively. Mice immunized with pSW3891/HBc showed strong anti-HBc response and specific high cytotoxicity of CTL.</p><p><b>CONCLUSION</b>pSW3891/HBc induced significantly humoral and cellular immune responses in Balb/c mice.</p>