Racemic O-methyl O-pheayl thiophosphoric acid 1 has been successfully resolved through its quinine and brucine salts in methanol solution by fractional crystallization. The absolute configurations of the optically act...Racemic O-methyl O-pheayl thiophosphoric acid 1 has been successfully resolved through its quinine and brucine salts in methanol solution by fractional crystallization. The absolute configurations of the optically active 1 have been established as (+)-R-1 and (-)-S-1 by chemical correlation.展开更多
The extraction of cadmium and zinc with di-(2-ethylhexyl)-dithiophosphoric acid(D2EHDTPA)-toluene and D2EHDTPA-trioctyl amine(TOA)-toluene has been investigated. Infrared spectrum analysis, the nuclear magnetic resona...The extraction of cadmium and zinc with di-(2-ethylhexyl)-dithiophosphoric acid(D2EHDTPA)-toluene and D2EHDTPA-trioctyl amine(TOA)-toluene has been investigated. Infrared spectrum analysis, the nuclear magnetic resonance spectrum(NMR) analysis and conductivity measurements confirm that the probable structures of the extracted complexes are CdA2 and ZnA2. Cadmium can be extracted by D2EHDTPA very easily. Almost all the cadmium can be extracted, but stripping of cadmium from the organic phase is very difficult. When a mixture of D2EHDTPA and TOA is used, selective extraction of cadmium from zinc sulfate solution can be achieved. Cadmium can be easily stripped from the organic phase.展开更多
The cyclizations of L-(+)-prolinol 1 derived from L-proline with (thio)phosphoro(-no)dichlorides 2 give 1,2,3-azaphosphaoxabicyclo[3.3.0] 3 consisting of unequal amounts of diastereoisomers, eight pairs of which have ...The cyclizations of L-(+)-prolinol 1 derived from L-proline with (thio)phosphoro(-no)dichlorides 2 give 1,2,3-azaphosphaoxabicyclo[3.3.0] 3 consisting of unequal amounts of diastereoisomers, eight pairs of which have been successfully separated by silica gel column chromatography or recrystallization.展开更多
The effect of the urease inhibitor,N-(n-butyl)thiophosphoric triamide(NBPT)at a range of application rates on rice production was examined in a field experiment at Jinxian County,Jiangxi Province,China.The normalized ...The effect of the urease inhibitor,N-(n-butyl)thiophosphoric triamide(NBPT)at a range of application rates on rice production was examined in a field experiment at Jinxian County,Jiangxi Province,China.The normalized difference vegetation index(NDVI)was measured at key growth stages in both early and late rice.The results showed that the grain yield increased significantly when urea was applied with NBPT,with the highest yield observed at 1.00%NBPT(wt/wt).NDVI differed with the growth stage of rice;it remained steady from the heading to the filling stage.Rice yield could be predicted from the NDVI taken at key rice growing stages,with R^(2) ranging from 0.34 to 0.69 in early rice and 0.49 to 0.70 in late rice.The validation test showed that RMSE(t·hm^(–2))values were 0.77 and 0.87 in early and late rice,respectively.Therefore,it was feasible to estimate rice yield for different amounts of urease inhibitor using NDVI.展开更多
基金This project was supported by National Natural Science Foundation of China
文摘Racemic O-methyl O-pheayl thiophosphoric acid 1 has been successfully resolved through its quinine and brucine salts in methanol solution by fractional crystallization. The absolute configurations of the optically active 1 have been established as (+)-R-1 and (-)-S-1 by chemical correlation.
基金Supported by the National Natural Science Foundation of China(No.59474009).
文摘The extraction of cadmium and zinc with di-(2-ethylhexyl)-dithiophosphoric acid(D2EHDTPA)-toluene and D2EHDTPA-trioctyl amine(TOA)-toluene has been investigated. Infrared spectrum analysis, the nuclear magnetic resonance spectrum(NMR) analysis and conductivity measurements confirm that the probable structures of the extracted complexes are CdA2 and ZnA2. Cadmium can be extracted by D2EHDTPA very easily. Almost all the cadmium can be extracted, but stripping of cadmium from the organic phase is very difficult. When a mixture of D2EHDTPA and TOA is used, selective extraction of cadmium from zinc sulfate solution can be achieved. Cadmium can be easily stripped from the organic phase.
文摘The cyclizations of L-(+)-prolinol 1 derived from L-proline with (thio)phosphoro(-no)dichlorides 2 give 1,2,3-azaphosphaoxabicyclo[3.3.0] 3 consisting of unequal amounts of diastereoisomers, eight pairs of which have been successfully separated by silica gel column chromatography or recrystallization.
基金supported by Special Fund for Agro-scientific Research in the Public Interest(201203030 and 201003016)the National Basic Research Program of China(2011CB100501-S06)Jiangxi Science and Technology Support plan(20141BBF60050).
文摘The effect of the urease inhibitor,N-(n-butyl)thiophosphoric triamide(NBPT)at a range of application rates on rice production was examined in a field experiment at Jinxian County,Jiangxi Province,China.The normalized difference vegetation index(NDVI)was measured at key growth stages in both early and late rice.The results showed that the grain yield increased significantly when urea was applied with NBPT,with the highest yield observed at 1.00%NBPT(wt/wt).NDVI differed with the growth stage of rice;it remained steady from the heading to the filling stage.Rice yield could be predicted from the NDVI taken at key rice growing stages,with R^(2) ranging from 0.34 to 0.69 in early rice and 0.49 to 0.70 in late rice.The validation test showed that RMSE(t·hm^(–2))values were 0.77 and 0.87 in early and late rice,respectively.Therefore,it was feasible to estimate rice yield for different amounts of urease inhibitor using NDVI.
