The efficiency of 7 treatment methods for breaking dormancy in zoysiagrass ( Zoysia japonica Steud.) seeds was synchronously compared. Two methods in which seeds soaking in 30% NaOH solution for 20 or 80 minutes were ...The efficiency of 7 treatment methods for breaking dormancy in zoysiagrass ( Zoysia japonica Steud.) seeds was synchronously compared. Two methods in which seeds soaking in 30% NaOH solution for 20 or 80 minutes were the optimum for breaking dormancy of seeds due to their simple and easy operation in techniques, economic and rapid effectiveness in performance and high germination rates (77.6% and 88.0% respectively).展开更多
A household microwave oven can be modified not only to be able to regulate microwave power continuously (including the intensity of EM field in the cavity),but also to be able to fit three flasks into the cavity (each...A household microwave oven can be modified not only to be able to regulate microwave power continuously (including the intensity of EM field in the cavity),but also to be able to fit three flasks into the cavity (each flask can be connected to a reflux condenser outside the cavity).The microwave heating uniformity of the three flasks was tested using water (50g. and 30g.) and ethanol (40g.) respectively.The results showed that the heating uniformity of the three flasks was 89±5% (average±σ n-1 ,n=22) and the microwave leakage was below 1 mW/cm 2.The modified oven was used by 90 undergraduate students for chemical synthesis experiment (microwave synthesis of veratraldehyde). The reaction time was only 2～3min.and the average yield was 86±9% (n=90).The variation of the average yields of among student groups was only 2%.Through variance analysis,F1,showing the difference was not significant.This modified microwave oven is especially suitable for chemical synthesis experiment for undergraduate students and for microwave digestion in analysis labs.展开更多
文摘The efficiency of 7 treatment methods for breaking dormancy in zoysiagrass ( Zoysia japonica Steud.) seeds was synchronously compared. Two methods in which seeds soaking in 30% NaOH solution for 20 or 80 minutes were the optimum for breaking dormancy of seeds due to their simple and easy operation in techniques, economic and rapid effectiveness in performance and high germination rates (77.6% and 88.0% respectively).
文摘A household microwave oven can be modified not only to be able to regulate microwave power continuously (including the intensity of EM field in the cavity),but also to be able to fit three flasks into the cavity (each flask can be connected to a reflux condenser outside the cavity).The microwave heating uniformity of the three flasks was tested using water (50g. and 30g.) and ethanol (40g.) respectively.The results showed that the heating uniformity of the three flasks was 89±5% (average±σ n-1 ,n=22) and the microwave leakage was below 1 mW/cm 2.The modified oven was used by 90 undergraduate students for chemical synthesis experiment (microwave synthesis of veratraldehyde). The reaction time was only 2～3min.and the average yield was 86±9% (n=90).The variation of the average yields of among student groups was only 2%.Through variance analysis,F1,showing the difference was not significant.This modified microwave oven is especially suitable for chemical synthesis experiment for undergraduate students and for microwave digestion in analysis labs.
