The overuse of antibiotics can lead to resistance among pathogenic bacteria. A new antibiotic that is effective against new and resistant bacterial strains is needed. Plants and marine organisms may offer such novel t...The overuse of antibiotics can lead to resistance among pathogenic bacteria. A new antibiotic that is effective against new and resistant bacterial strains is needed. Plants and marine organisms may offer such novel treatments. In this study, extracts of the seaweed U. lactuca, and the plant seeds N. sativa were tested against strains of Gram-positive cocci and Gram-negative bacilli S. aureus, and P. aeruginosa. The results of the bacterial inhibitor showed high activity in both extracts with inhibition of S. aureus growth up to 30 mm and 20 mm and P. aeruginosa growth inhibition was up to 12 mm and 15 mm, after the treated with 100 μl U. lactuca and N. sativa extracts, respectively. The MICs and MBCs were reflected with the growth inhibitor with values of 2 μl, 8 μl and 4 μl, 8 μl for S. aureus and P. aeruginosa after treated with N. sativa respectively. Kill-time increases as concentrations of U. lactuca and N. sativa extracts increase. Moreover, extracts stored in the transparent bottle decreased in effectiveness after one month of storage with percentage of 58.85%. After three months, heating the extracts of U. lactuca and N. sativa to 90°C increased their antibacterial activity.展开更多
Chinese Academy of Social Sciences released the "China Industry Competitiveness Report(2012) NO.2",Guo Chaoxian,deputy director of Industrial Organization Office of Academy of Social Sciences Institute of In...Chinese Academy of Social Sciences released the "China Industry Competitiveness Report(2012) NO.2",Guo Chaoxian,deputy director of Industrial Organization Office of Academy of Social Sciences Institute of Industrial Economics,said that展开更多
肌肉疲劳是由运动引起的肌肉最大随意收缩力减小的现象,其研究可应用于生理医学的职业病预防或体育工程的运动员训练等方面。本文采用短时傅里叶变换对肌音信号进行处理,提取频域特征平均功率频率(Mean Power Frequency,MPF)和中值频率(...肌肉疲劳是由运动引起的肌肉最大随意收缩力减小的现象,其研究可应用于生理医学的职业病预防或体育工程的运动员训练等方面。本文采用短时傅里叶变换对肌音信号进行处理,提取频域特征平均功率频率(Mean Power Frequency,MPF)和中值频率(Median Frequency,MDF),研究其与肌肉疲劳程度之间的关系。9名健康的男性志愿者参与了本次试验,采用等值于60%最大随意收缩力(MVC)的力产生恒力肌肉疲劳,同步记录每一位受试者桡侧腕屈肌的肌音信号,对提取的频域参数进行分析。将持续30s的肌肉疲劳过程分为6个时间阶段(每个阶段为5s),并对每个时间阶段内的MPF和MDF计算均值。结果表明,随着肌肉疲劳程度加深,肌音信号的MPF和MDF在每个时间阶段内的均值均呈现近似线性下降的趋势。在30s肌肉疲劳过程中,从第1阶段(1~5s)到第6阶段(26~30s),MPF均值下降了15.8%,MDF均值下降了26.1%。基于短时傅里叶变换提取的MPF和MDF指标能良好地反映疲劳敏感性和稳定性,在评定肌肉静态疲劳方面是较好的参考指标。本文采用的方法和得到的结果为后期更深入地使用肌音信号对肌肉疲劳程度进行量化研究提供了依据。展开更多
At the China-U.S. Think Tanks and Media Online Forum on July 9, State Councilor and Foreign Minister Wang Yi gave a speech titled Stay on the Right Track and Keep Pace With the Times to Ensure the Right Direction for ...At the China-U.S. Think Tanks and Media Online Forum on July 9, State Councilor and Foreign Minister Wang Yi gave a speech titled Stay on the Right Track and Keep Pace With the Times to Ensure the Right Direction for China-U.S. Relations. He called on the two countries to focus on dialogue and cooperation and prevent confrontation and decoupling.展开更多
文摘The overuse of antibiotics can lead to resistance among pathogenic bacteria. A new antibiotic that is effective against new and resistant bacterial strains is needed. Plants and marine organisms may offer such novel treatments. In this study, extracts of the seaweed U. lactuca, and the plant seeds N. sativa were tested against strains of Gram-positive cocci and Gram-negative bacilli S. aureus, and P. aeruginosa. The results of the bacterial inhibitor showed high activity in both extracts with inhibition of S. aureus growth up to 30 mm and 20 mm and P. aeruginosa growth inhibition was up to 12 mm and 15 mm, after the treated with 100 μl U. lactuca and N. sativa extracts, respectively. The MICs and MBCs were reflected with the growth inhibitor with values of 2 μl, 8 μl and 4 μl, 8 μl for S. aureus and P. aeruginosa after treated with N. sativa respectively. Kill-time increases as concentrations of U. lactuca and N. sativa extracts increase. Moreover, extracts stored in the transparent bottle decreased in effectiveness after one month of storage with percentage of 58.85%. After three months, heating the extracts of U. lactuca and N. sativa to 90°C increased their antibacterial activity.
文摘Chinese Academy of Social Sciences released the "China Industry Competitiveness Report(2012) NO.2",Guo Chaoxian,deputy director of Industrial Organization Office of Academy of Social Sciences Institute of Industrial Economics,said that
文摘肌肉疲劳是由运动引起的肌肉最大随意收缩力减小的现象,其研究可应用于生理医学的职业病预防或体育工程的运动员训练等方面。本文采用短时傅里叶变换对肌音信号进行处理,提取频域特征平均功率频率(Mean Power Frequency,MPF)和中值频率(Median Frequency,MDF),研究其与肌肉疲劳程度之间的关系。9名健康的男性志愿者参与了本次试验,采用等值于60%最大随意收缩力(MVC)的力产生恒力肌肉疲劳,同步记录每一位受试者桡侧腕屈肌的肌音信号,对提取的频域参数进行分析。将持续30s的肌肉疲劳过程分为6个时间阶段(每个阶段为5s),并对每个时间阶段内的MPF和MDF计算均值。结果表明,随着肌肉疲劳程度加深,肌音信号的MPF和MDF在每个时间阶段内的均值均呈现近似线性下降的趋势。在30s肌肉疲劳过程中,从第1阶段(1~5s)到第6阶段(26~30s),MPF均值下降了15.8%,MDF均值下降了26.1%。基于短时傅里叶变换提取的MPF和MDF指标能良好地反映疲劳敏感性和稳定性,在评定肌肉静态疲劳方面是较好的参考指标。本文采用的方法和得到的结果为后期更深入地使用肌音信号对肌肉疲劳程度进行量化研究提供了依据。
文摘At the China-U.S. Think Tanks and Media Online Forum on July 9, State Councilor and Foreign Minister Wang Yi gave a speech titled Stay on the Right Track and Keep Pace With the Times to Ensure the Right Direction for China-U.S. Relations. He called on the two countries to focus on dialogue and cooperation and prevent confrontation and decoupling.
