Publications (3)0 Total impact
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Article: [Dynamic analysis of major active ingredients of Cortex Moutan cultivated in Dianjiang county of Chongqing].
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ABSTRACT: To study the change of paeonol and paeoniflorin, the two major active ingredients contained in Cortex Moutan cultivated in Dianjiang county of Chongqing, due to the change of some influence factors, and explore suitable plant conditions and quality cotrol methods of Cortex Moutan. Paeonol and paeoniflorin were determined by HPLC in samples from Dianjiang. The ratio of paeonol and paeoniflorin in Cortex Moutan was regularly influenced by altitude, the growth years and harvest time. Cortex could be cultivated at altitude of 400 m to 800 m but 600 m is the best aria because of the peak of the percentage composition of paeonol and paeoniflorin at 600 m. The first and middle third of October in the fifth year is the best picking time of Cortex Moutan because of the maximum of the percentage composition of paeonol and paeoniflorin.Zhongguo Zhong yao za zhi = Zhongguo zhongyao zazhi = China journal of Chinese materia medica 09/2007; 32(15):1501-4. -
Article: Driving characteristics of a motorcycle fuelled with hydrogen-rich gas produced by an onboard plasma reformer
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ABSTRACT: The driving performance and emission characteristics of a 125 cc motorcycle equipped with an onboard plasma reformer for producing hydrogen-rich gas were investigated. Butane with suitable air flow rate was induced into the plasma reformer to produce hydrogen-rich gas, which was used as supplementary fuel for the internal combustion engine. The motorcycle was run under steady and transient conditions on a chassis dynamometer to assess the driving performance and exhaust emissions.Prior to the driving, the operation parameters of the plasma reformer were optimized in a series of tests and the results were an O2/C ratio of 0.55 and a butane supply rate of 1.16 L/min. It was shown that under a constant speed of 40 km/h, with the CO and HC emissions similar to that of the original engine, the NOx emission was found to be improved by 56.8%. During transient driving condition, the improvement of 16%–41% in NOx concentration was achieved by adding hydrogen-rich gas. The emissions of the motorcycle were also analyzed on a chassis dynamometer tracing an ECE-40 driving pattern. The NOx emission was improved by 34% as was the HC emission by 4.08%, although the CO emission was increased. Simultaneously, the acceleration characteristics of the vehicle were tested, and were similar under both fuelling systems.International Journal of Hydrogen Energy. -
Article: Chitosan oligosaccharides protect human umbilical vein endothelial cells from hydrogen peroxide-induced apoptosis
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ABSTRACT: This study aimed to investigate the protective effect of chitosan oligosaccharides (COS) on human umbilical vein endothelial cell (HUVEC) apoptosis induced by hydrogen peroxide (H2O2). We found that COS not only reversed the decrease of cell viability and proliferation activity, but ameliorated nuclear chromatin damage in H2O2-induced HUVECs. Additionally, COS contributed to the decrease of cytosolic Ca2+ level, increase of mitochondrial membrane potential, up-regulation of Bcl-2 mRNA, down-regulation of Bax mRNA, reduction of cleaved caspase-3 protein, inhibition of phosphorylated p38 mitogen-activated protein kinase (MAPK) and induction of phosphorylated Akt in HUVECs. Further, H2O2-induced caspase-3 activation could be suppressed by p38 MAPK inhibitor (SB203580) and up-regulated by phosphatidylinositol-3-kinase (PI3K) inhibitor (LY294002), indicating the involvement of p38 MAPK and PI3K/Akt signaling pathways. In conclusion, the results show that COS may effectively inhibit the H2O2-induced HUVEC apoptosis.Carbohydrate Polymers.
