[Objective] The aim was to introduce the development and application of 2BDQ-8 rice direct sowing machine and provide a theoretical basis for rice mechanization production. [Method] 2BDQ-8 rice direct sowing machine w...[Objective] The aim was to introduce the development and application of 2BDQ-8 rice direct sowing machine and provide a theoretical basis for rice mechanization production. [Method] 2BDQ-8 rice direct sowing machine was used for the promotion test in field of several cities and counties in Jiangsu Province,and artificial rice planting and mechanization rice planting were compared to explore the production and economic situation. [Result] 2BDQ-8 rice direct sowing machine had advantages such as high efficiency and low cost,the rice direct sowing machine saved about 30% compared to the artificial rice planting and mechanization rice planting,and the overall efficiency was significant. [Conclusion] 2BDQ-8 rice sowing machine was a production technology that had low cost and high efficiency,which should be widely applied.展开更多
The rare ginsenoside Compound K （C-K） is attracting more attention because of its good physiological activity and urgent need. There are many pathways to obtain ginsenoside C-K, including chemical and biological met...The rare ginsenoside Compound K （C-K） is attracting more attention because of its good physiological activity and urgent need. There are many pathways to obtain ginsenoside C-K, including chemical and biological methods. Among these, the conversion of PPD-type ginsenosides by enzymatic hydrolysis is a trend due to its high efficiency and mild conditions. For effectively extracting from the other panaxadiol saponins, the conversion process for ginsenoside C-K was investigated using snailases in this study. The univariate experimental design and response surface methodology were used to determine the optimal hydrolysis conditions for the conversion of ginsenoside Rbl into ginsenoside C-K by snailases. The optimum conditions were as follows： pH 5,12, temperature 51 ℃, ratio of snailase/substrate 0.21, and reaction time 48 h. On the basis of these parameters, the addition of 1.0 mmol· L- 1 ferric ion was found to significantly improve the enzymolysis ofsnailases for the first time. With the above conditions, the maximum conversion rate reached 89.7%, suggesting that the process can obviously increase the yield of ginsenoside C-K. The bioassay tests indicated that the ginsenoside C-K showed anti-tumor activity in a series of tumor cell lines. Based on these results, we can conclude that the process of rare ginsenoside C- K production by enzymolysis with snailase is feasible, efficient, and suitable for the industrial production and application.展开更多
Taiwan and China's Mainland signed the Economic Cooperation Framework Agreement （ECFA） on 29th June, 2010. The ECFA is a landmark bilateral trade agreement that can make Taiwan a new gateway to China's Mainl...Taiwan and China's Mainland signed the Economic Cooperation Framework Agreement （ECFA） on 29th June, 2010. The ECFA is a landmark bilateral trade agreement that can make Taiwan a new gateway to China's Mainland. However, the Taiwan Residents petrochemical industry would be very disappointed with the early harvest list as it excluded some critical export items. The purpose of this paper is to amend the understanding of the possible impact on petrochemical market after ECFA is enacted. The authors examine the cumulative daily response of stock prices to five announcements about the ECFA and evaluate the existence of the abnormal return. The authors use daily data from January 2010 to February 2011 to employ an event study approach. The empirical results suggest that the three ECFA announcement dates, as well as the signing date, show significantly negative abnormal return due to the prior positive cumulative response of Taiwan chemicals listed stock prices. This paper can provide the petrochemical industry manufacturer, owners, and investors with further insights into how chemicals stock returns react to a big event like ECFA.展开更多
基金Supported by the Subprogram " the Mechanization Development of High Speed Rice Sowing-Rice Direct Sowing Machine" of the Programs of Science Research for the "10th Five-year Plan" of MinistryScience and Technology (2001BA504B01-02)~~
文摘[Objective] The aim was to introduce the development and application of 2BDQ-8 rice direct sowing machine and provide a theoretical basis for rice mechanization production. [Method] 2BDQ-8 rice direct sowing machine was used for the promotion test in field of several cities and counties in Jiangsu Province,and artificial rice planting and mechanization rice planting were compared to explore the production and economic situation. [Result] 2BDQ-8 rice direct sowing machine had advantages such as high efficiency and low cost,the rice direct sowing machine saved about 30% compared to the artificial rice planting and mechanization rice planting,and the overall efficiency was significant. [Conclusion] 2BDQ-8 rice sowing machine was a production technology that had low cost and high efficiency,which should be widely applied.
基金Supported by the National Natural Science Foundation of China(21476182,21776227,21776228)Shaanxi Key Laboratory of Degradable Biomedical Materials Program(2014SZS07-K04,2014SZS07-P05,15JS106,2014SZS07-Z01,2014SZS07-Z02,2016SZSj-35,2014SZS07-K03)Shaanxi R&D Center of Biomaterials and Fermentation Engineering Program(2015HBGC-04)
文摘The rare ginsenoside Compound K （C-K） is attracting more attention because of its good physiological activity and urgent need. There are many pathways to obtain ginsenoside C-K, including chemical and biological methods. Among these, the conversion of PPD-type ginsenosides by enzymatic hydrolysis is a trend due to its high efficiency and mild conditions. For effectively extracting from the other panaxadiol saponins, the conversion process for ginsenoside C-K was investigated using snailases in this study. The univariate experimental design and response surface methodology were used to determine the optimal hydrolysis conditions for the conversion of ginsenoside Rbl into ginsenoside C-K by snailases. The optimum conditions were as follows： pH 5,12, temperature 51 ℃, ratio of snailase/substrate 0.21, and reaction time 48 h. On the basis of these parameters, the addition of 1.0 mmol· L- 1 ferric ion was found to significantly improve the enzymolysis ofsnailases for the first time. With the above conditions, the maximum conversion rate reached 89.7%, suggesting that the process can obviously increase the yield of ginsenoside C-K. The bioassay tests indicated that the ginsenoside C-K showed anti-tumor activity in a series of tumor cell lines. Based on these results, we can conclude that the process of rare ginsenoside C- K production by enzymolysis with snailase is feasible, efficient, and suitable for the industrial production and application.
文摘Taiwan and China's Mainland signed the Economic Cooperation Framework Agreement （ECFA） on 29th June, 2010. The ECFA is a landmark bilateral trade agreement that can make Taiwan a new gateway to China's Mainland. However, the Taiwan Residents petrochemical industry would be very disappointed with the early harvest list as it excluded some critical export items. The purpose of this paper is to amend the understanding of the possible impact on petrochemical market after ECFA is enacted. The authors examine the cumulative daily response of stock prices to five announcements about the ECFA and evaluate the existence of the abnormal return. The authors use daily data from January 2010 to February 2011 to employ an event study approach. The empirical results suggest that the three ECFA announcement dates, as well as the signing date, show significantly negative abnormal return due to the prior positive cumulative response of Taiwan chemicals listed stock prices. This paper can provide the petrochemical industry manufacturer, owners, and investors with further insights into how chemicals stock returns react to a big event like ECFA.
