[Objective] The aim was to screen out plants which had strong contact activity against Lipaphis erysimi Kaltenbach. [Method] Twenty plant species which were collected from Gupo Mountain in Hezhou of China were extract...[Objective] The aim was to screen out plants which had strong contact activity against Lipaphis erysimi Kaltenbach. [Method] Twenty plant species which were collected from Gupo Mountain in Hezhou of China were extracted with methanol by cold soaking method. Contact activities of 20 methanol plant extracts against L. erysimi were determined by capillary micro spot method. [Result] The methanol extracts from Mussaenda esquirolli Levi. and Folium trematis Orientalis had the highest contact activities against L. erysimi at the dose of 10 p^g/head, and their 24 h corrected mortality rates were 92.22% and 92.15%, respectively; followed by Folium trematis and Viola hossei, with 24 h corrected mortality rate of 87.59% and 82.95%, respectively. The methanol extract of Hedyotis lancea had medium activity, with 24 h corrected mortality rate of 65.52%. Methanol extracts of the other plants had low contact activities against L. erysimi, with the corrected mortality rate lower than 50%. The methanol extracts of M. esquiroUi, F. variolosa and F. trematis had high contact toxicity, with LDS0 of 0. 768 6, 0.784 1 and 1. 504 4 μg/head, respectively. [ Conclusion] M. esquirolli, F. variolosa and F. trematis show exploitation potential, and they are worth further studying.展开更多
This study aims to improve the evaluation of residual oil saturation in water flooded zones based on the material balance model(MBM)with variable multiple for injected water.We investigated the change patterns of rock...This study aims to improve the evaluation of residual oil saturation in water flooded zones based on the material balance model(MBM)with variable multiple for injected water.We investigated the change patterns of rock-electro parameters during waterflooding through the analysis of displacement tests.Our work differentiated the waterflooding into numerous displacement processes and accordingly propose an improved time-differentiated variable multiple MBM.The calculation results of the improved model are more consistent with the displacement experiment data of cores.Furthermore,the improved method was integrated into the comprehensive interpretation platform of offshore logging to analyze water flooded zones of a well in the A oilfield.As a result,the residual oil saturation calculated is in close agreement with the results of experiments on cores.Our results indicate that the time-differentiation and variable multiplier for injected water can effectively enhance the assessment accuracy of the residual oil saturation of water-flooded zones.展开更多
基金We would like to thank Dr Nam-Hai Chua （Rockefeller Univer- sity） for kindly providing the pBA002Myc vector and the Arabi- dopsis Biological Resource Center （ABRC）, Ohio State University for providing ToDNA insertion lines. This work was supported by grants from National Natural Science Foundation of China （No. 30530400/90717006/30670195） to Q Xie and Y Wu, the Chinese Academy of Science （KSCX2-YW-N-010 and CXTD-S2005-2）, and the （iuangdong Natural Science Foundation, China （No. 5300648） to Z Deng.
基金Supported by Guangxi Natural Science Foundation ( 2011GXNSFB018055)
文摘[Objective] The aim was to screen out plants which had strong contact activity against Lipaphis erysimi Kaltenbach. [Method] Twenty plant species which were collected from Gupo Mountain in Hezhou of China were extracted with methanol by cold soaking method. Contact activities of 20 methanol plant extracts against L. erysimi were determined by capillary micro spot method. [Result] The methanol extracts from Mussaenda esquirolli Levi. and Folium trematis Orientalis had the highest contact activities against L. erysimi at the dose of 10 p^g/head, and their 24 h corrected mortality rates were 92.22% and 92.15%, respectively; followed by Folium trematis and Viola hossei, with 24 h corrected mortality rate of 87.59% and 82.95%, respectively. The methanol extract of Hedyotis lancea had medium activity, with 24 h corrected mortality rate of 65.52%. Methanol extracts of the other plants had low contact activities against L. erysimi, with the corrected mortality rate lower than 50%. The methanol extracts of M. esquiroUi, F. variolosa and F. trematis had high contact toxicity, with LDS0 of 0. 768 6, 0.784 1 and 1. 504 4 μg/head, respectively. [ Conclusion] M. esquirolli, F. variolosa and F. trematis show exploitation potential, and they are worth further studying.
文摘This study aims to improve the evaluation of residual oil saturation in water flooded zones based on the material balance model(MBM)with variable multiple for injected water.We investigated the change patterns of rock-electro parameters during waterflooding through the analysis of displacement tests.Our work differentiated the waterflooding into numerous displacement processes and accordingly propose an improved time-differentiated variable multiple MBM.The calculation results of the improved model are more consistent with the displacement experiment data of cores.Furthermore,the improved method was integrated into the comprehensive interpretation platform of offshore logging to analyze water flooded zones of a well in the A oilfield.As a result,the residual oil saturation calculated is in close agreement with the results of experiments on cores.Our results indicate that the time-differentiation and variable multiplier for injected water can effectively enhance the assessment accuracy of the residual oil saturation of water-flooded zones.
