Semi-selective media are valuable tools for detection and isolation of viable fungal propagules. After testing the in vitro sensitivity of Pochonia chlamydosporia to 9 different fungicidal compounds, boscalid and thio...Semi-selective media are valuable tools for detection and isolation of viable fungal propagules. After testing the in vitro sensitivity of Pochonia chlamydosporia to 9 different fungicidal compounds, boscalid and thiophanate-methyl were chosen for a modification of Kerry’s semi-selective agar. Rifampicin replaced tetracyclin to provide superior suppression of bacterial growth. The Pc medium contained 17 g/L corn meal agar, 17.5 g/L (NaCl), 75 mg/L Rose Bengal, 50 mg/L boscalid, 30 mg/L thiophanate-methyl, 50 mg/L rifampicin, 50 mg/L streptomycin sulphate, 50 mg/L chloramphenicol, 3 mL/L Triton X-100. Dilution plating of soil extracts from various California field soils amended with chlamydospores of P. chlamydosporia showed the modified medium was equivalent to Kerry’s agar in enumerating viable propagules of the fungus. While P. chlamydosporia colonies grew slower on the Pc medium, the fungal colonies appeared more uniform than on the original semi-selective agar.展开更多
The interaction between minerals and heavy metals has been a hot object of study in environmental science, mineralogy and soil science. Through the selective adsorption experiment of Ca\|montmorillonite, illite and ka...The interaction between minerals and heavy metals has been a hot object of study in environmental science, mineralogy and soil science. Through the selective adsorption experiment of Ca\|montmorillonite, illite and kaolinite to Cu\+\{2+\}, Pb\+\{2+\}, Zn\+\{2+\}, Cd\+\{2+\} and Cr\+\{3+\} ions at certain conditions, it could be concluded that Cr\+\{3+\} is most effectively sorbed by all the three minerals. Also, it can be found that Pb\+\{2+\} shows a strong affinity for illite and kaolinite while Cu\+\{2+\} for montmorillonite. Based on the adsorption experiment at varying pH of solution, it can be found that the amount of heavy metals sorbed by minerals increases with increasing pH of the solution.展开更多
To achieve the dual demand of resisting violent impact and attenuating vibration in vibration-impact-safety of protection for precision equipment such as MEMS packaging system, a theo- retical mathematical model of mu...To achieve the dual demand of resisting violent impact and attenuating vibration in vibration-impact-safety of protection for precision equipment such as MEMS packaging system, a theo- retical mathematical model of multi-medium coupling shock absorber is presented. The coupling of quadratic damping, linear damping, Coulomb damping and nonlinear spring are considered in the model. The approximate theoretical calculating formulae are deduced by introducing transformation-tactics. The contrasts between the analytical results and numerical integration results are developed. The resisting impact characteristics of the model are also analyzed in progress. In the meantime, the optimum model of the parameters matching selection for design of the shock absorber is built. The example design is illustrated to confirm the validity of the modeling method and the theoretical solution.展开更多
文摘Semi-selective media are valuable tools for detection and isolation of viable fungal propagules. After testing the in vitro sensitivity of Pochonia chlamydosporia to 9 different fungicidal compounds, boscalid and thiophanate-methyl were chosen for a modification of Kerry’s semi-selective agar. Rifampicin replaced tetracyclin to provide superior suppression of bacterial growth. The Pc medium contained 17 g/L corn meal agar, 17.5 g/L (NaCl), 75 mg/L Rose Bengal, 50 mg/L boscalid, 30 mg/L thiophanate-methyl, 50 mg/L rifampicin, 50 mg/L streptomycin sulphate, 50 mg/L chloramphenicol, 3 mL/L Triton X-100. Dilution plating of soil extracts from various California field soils amended with chlamydospores of P. chlamydosporia showed the modified medium was equivalent to Kerry’s agar in enumerating viable propagules of the fungus. While P. chlamydosporia colonies grew slower on the Pc medium, the fungal colonies appeared more uniform than on the original semi-selective agar.
文摘The interaction between minerals and heavy metals has been a hot object of study in environmental science, mineralogy and soil science. Through the selective adsorption experiment of Ca\|montmorillonite, illite and kaolinite to Cu\+\{2+\}, Pb\+\{2+\}, Zn\+\{2+\}, Cd\+\{2+\} and Cr\+\{3+\} ions at certain conditions, it could be concluded that Cr\+\{3+\} is most effectively sorbed by all the three minerals. Also, it can be found that Pb\+\{2+\} shows a strong affinity for illite and kaolinite while Cu\+\{2+\} for montmorillonite. Based on the adsorption experiment at varying pH of solution, it can be found that the amount of heavy metals sorbed by minerals increases with increasing pH of the solution.
基金This project is supported by National Defense Science Foundation of China (No.00J16.2.5.DZ0502)Foundation for Qualified Personnel of Jiangsu University, China(No.04JDG027)Provincial Natural Science Foundation of Guangxi. China(No.0339037, No.0141042).
文摘To achieve the dual demand of resisting violent impact and attenuating vibration in vibration-impact-safety of protection for precision equipment such as MEMS packaging system, a theo- retical mathematical model of multi-medium coupling shock absorber is presented. The coupling of quadratic damping, linear damping, Coulomb damping and nonlinear spring are considered in the model. The approximate theoretical calculating formulae are deduced by introducing transformation-tactics. The contrasts between the analytical results and numerical integration results are developed. The resisting impact characteristics of the model are also analyzed in progress. In the meantime, the optimum model of the parameters matching selection for design of the shock absorber is built. The example design is illustrated to confirm the validity of the modeling method and the theoretical solution.