As a discovery of C\_C coupling and amine elimination reaction by treatment of \{6\|dimethylamino\|6\|methylfulvene\} with zirconium tetrachloride, experiments using amino\|substituted benzofulvene 1a or aminopentaful...As a discovery of C\_C coupling and amine elimination reaction by treatment of \{6\|dimethylamino\|6\|methylfulvene\} with zirconium tetrachloride, experiments using amino\|substituted benzofulvene 1a or aminopentafulvene 2a, instead of 6\|dimethylamino\|6\|methylfulvene, gave \{bis\{\[1\|(dimethylamino)\}\}ethenyl\|indenyl\]zirconium dichloride 1c which was characterized by X\|ray diffraction as monoclinic, space group \%C2/c\%, \%a\%=2.028 8(4) nm, \%b\%=0.981 7(2) nm, \%c\%=1.458 9(3) nm, \%β\%=115.73(3)°, \%V\%=2.617 5(9) nm\+3, \%Z\%=4, \%R\%=0.072 3, and bis\[(1\|methyl\|4,5\|dihydro\|2\|pyrrolnyl)cyclopentadienyl\]zirconium dichloride 2c as triclinic, space group \%P\%1, \%a\%=0.807 49(16) nm, \%b\%=\{0.943 40(19)\} nm, \%c\%=\{1.423 8(3)\} nm, \%α\%=91.04(3), \%β\%=97.41(3), \%γ\%=106.68(3)°, \%V\%=1.028 6(4) nm\+3, \%Z\%=2, \%R\%=0.080 0.展开更多
[Objective] This study aimed to analyze the type III effector tccP and tccP2 genes in Escherichia coli O157：H7 from Chinese water-chestnut. [Method] Gene-specific and locus-specific primers were utilized to amplify t...[Objective] This study aimed to analyze the type III effector tccP and tccP2 genes in Escherichia coli O157：H7 from Chinese water-chestnut. [Method] Gene-specific and locus-specific primers were utilized to amplify tccP/tccP2 and their flanking regions for sequence analysis. [Result] E. coli O157：H7 CWN11 harbored intact tccP and tccP2 genes, however, the number of proline-rich repeats in tccP gene was only one that probably resulted in biological incapability, whereas, the tccP2 gene consisted of five and half proline-rich repeats and could encode functional protein. [Conclusion] Here, we reported the first sequence of tccP gene that consisted of only one proline-rich repeat and tccP2 was assumed to play a crucial role in colonization and subsequent signaling cascades.展开更多
The photocatalytic activity of carbon nitride(CN)materials is mainly limited to small specific surface areas,limited solar absorption,and low separation and mobility of photoinduced carriers.In this study,we developed...The photocatalytic activity of carbon nitride(CN)materials is mainly limited to small specific surface areas,limited solar absorption,and low separation and mobility of photoinduced carriers.In this study,we developed a precursor-modified strategy for the synthesis of graphitic CN with highly efficient photocatalytic performance.The precursor dicyandiamide reformed by different acids undergoes a basic structural change and transforms into diverse new precursors.The thin porous amino-rich HNO_(3)-CN(5H-CN)was calcined by dicyandiamidine nitrate,formed by concentrated nitric acid modified dicyandiamide,and presented the best photocatalytic degradation rate of Rh B,more than 34 times that of bulk graphitic CN.Moreover,the photocatalytic hydrogen evolution rate of 5H-CN significantly improved.The TG-DSC-FTIR analyses indicated that the distinguishing thermal polymerization process of 5H-CN led to its thin porous amino-rich structure,and the theoretical calculations revealed that the negative conduction band potential of 5H-CN was attributed to its amino-rich structure.It is anticipated that the thin porous structure and the negative conduction band position of 5H-CN play important roles in the improvement of the photocatalytic performance.This study demonstrates that precursor modification is a promising project to induce a new thermal polycondensation process for the synthesis of CN with enhanced photocatalytic performance.展开更多
文摘As a discovery of C\_C coupling and amine elimination reaction by treatment of \{6\|dimethylamino\|6\|methylfulvene\} with zirconium tetrachloride, experiments using amino\|substituted benzofulvene 1a or aminopentafulvene 2a, instead of 6\|dimethylamino\|6\|methylfulvene, gave \{bis\{\[1\|(dimethylamino)\}\}ethenyl\|indenyl\]zirconium dichloride 1c which was characterized by X\|ray diffraction as monoclinic, space group \%C2/c\%, \%a\%=2.028 8(4) nm, \%b\%=0.981 7(2) nm, \%c\%=1.458 9(3) nm, \%β\%=115.73(3)°, \%V\%=2.617 5(9) nm\+3, \%Z\%=4, \%R\%=0.072 3, and bis\[(1\|methyl\|4,5\|dihydro\|2\|pyrrolnyl)cyclopentadienyl\]zirconium dichloride 2c as triclinic, space group \%P\%1, \%a\%=0.807 49(16) nm, \%b\%=\{0.943 40(19)\} nm, \%c\%=\{1.423 8(3)\} nm, \%α\%=91.04(3), \%β\%=97.41(3), \%γ\%=106.68(3)°, \%V\%=1.028 6(4) nm\+3, \%Z\%=2, \%R\%=0.080 0.
基金Supported by the National Key Technology Research and Development Program of China (2012BAK08B07)the National Natural Science Foundation of China (31201919)~~
文摘[Objective] This study aimed to analyze the type III effector tccP and tccP2 genes in Escherichia coli O157：H7 from Chinese water-chestnut. [Method] Gene-specific and locus-specific primers were utilized to amplify tccP/tccP2 and their flanking regions for sequence analysis. [Result] E. coli O157：H7 CWN11 harbored intact tccP and tccP2 genes, however, the number of proline-rich repeats in tccP gene was only one that probably resulted in biological incapability, whereas, the tccP2 gene consisted of five and half proline-rich repeats and could encode functional protein. [Conclusion] Here, we reported the first sequence of tccP gene that consisted of only one proline-rich repeat and tccP2 was assumed to play a crucial role in colonization and subsequent signaling cascades.
文摘The photocatalytic activity of carbon nitride(CN)materials is mainly limited to small specific surface areas,limited solar absorption,and low separation and mobility of photoinduced carriers.In this study,we developed a precursor-modified strategy for the synthesis of graphitic CN with highly efficient photocatalytic performance.The precursor dicyandiamide reformed by different acids undergoes a basic structural change and transforms into diverse new precursors.The thin porous amino-rich HNO_(3)-CN(5H-CN)was calcined by dicyandiamidine nitrate,formed by concentrated nitric acid modified dicyandiamide,and presented the best photocatalytic degradation rate of Rh B,more than 34 times that of bulk graphitic CN.Moreover,the photocatalytic hydrogen evolution rate of 5H-CN significantly improved.The TG-DSC-FTIR analyses indicated that the distinguishing thermal polymerization process of 5H-CN led to its thin porous amino-rich structure,and the theoretical calculations revealed that the negative conduction band potential of 5H-CN was attributed to its amino-rich structure.It is anticipated that the thin porous structure and the negative conduction band position of 5H-CN play important roles in the improvement of the photocatalytic performance.This study demonstrates that precursor modification is a promising project to induce a new thermal polycondensation process for the synthesis of CN with enhanced photocatalytic performance.
