[Objective] The aim was to investigate whether NO is involved in the inhibitory effect of salicylic acid on the growth at low temperature in Arabidopsis.[Method] The endogenous NO level in roots of wild-type and NahG ...[Objective] The aim was to investigate whether NO is involved in the inhibitory effect of salicylic acid on the growth at low temperature in Arabidopsis.[Method] The endogenous NO level in roots of wild-type and NahG mutant growing at 22 or 4 ℃ was measured with NO-specific probe DAF-FM DA staining method.[Result] NO level in plants growing at 4 ℃ for a long term could be increased with time;low temperature could induce NO production in wild-type and NahG mutant,and the NO level in NahG mutant with low level of salicylic acid was significantly lower than that in wild-type.[Conclusion] NO was involved in the inhibitory effect of salicylic acid on the growth of Arabidopsis at low temperature.展开更多
The low‐temperature hydrothermal stabilities of Cu‐SAPO‐34samples with various Si contents and Cu loadings were systematically investigated.The NH3oxidation activities and NH3‐selective catalytic reduction(SCR)act...The low‐temperature hydrothermal stabilities of Cu‐SAPO‐34samples with various Si contents and Cu loadings were systematically investigated.The NH3oxidation activities and NH3‐selective catalytic reduction(SCR)activities(mainly the low‐temperature activities)of all the Cu‐SAPO‐34catalysts declined after low‐temperature steam treatment(LTST).These results show that the texture and acid density of Cu‐SAPO‐34can be better preserved by increasing the Cu loading,although the hydrolysis of Si-O-Al bonds is inevitable.The stability of Cu ions and the stability of the SAPO framework were positively correlated at relatively low Cu loadings.However,a high Cu loading(e.g.,3.67wt%)resulted in a significant decrease in the number of isolated Cu ions.Aggregation of CuO particles also occurred during the LTST,which accounts for the decreasing NH3oxidation activities of the catalysts.Among the catalysts,Cu‐SAPO‐34with a high Si content and medium Cu content(1.37wt%)showed the lowest decrease in NH3‐SCR because its Cu2+content was well retained and its acid density was well preserved.展开更多
基金Supported by National High Technology Research and Development Program of China(863Program,No.2002AA2Z1001)National Natural Science Foundation of China(30328003)Doctoral Scientific Research Fund of Henan University of TCM~~
文摘[Objective] The aim was to investigate whether NO is involved in the inhibitory effect of salicylic acid on the growth at low temperature in Arabidopsis.[Method] The endogenous NO level in roots of wild-type and NahG mutant growing at 22 or 4 ℃ was measured with NO-specific probe DAF-FM DA staining method.[Result] NO level in plants growing at 4 ℃ for a long term could be increased with time;low temperature could induce NO production in wild-type and NahG mutant,and the NO level in NahG mutant with low level of salicylic acid was significantly lower than that in wild-type.[Conclusion] NO was involved in the inhibitory effect of salicylic acid on the growth of Arabidopsis at low temperature.
基金supported by the National Natural Science Foundation of China(21676262,21506207,21606221)the Key Research Program of Frontier Sciences,CAS(QYZDB-SSW-JSC040)~~
文摘The low‐temperature hydrothermal stabilities of Cu‐SAPO‐34samples with various Si contents and Cu loadings were systematically investigated.The NH3oxidation activities and NH3‐selective catalytic reduction(SCR)activities(mainly the low‐temperature activities)of all the Cu‐SAPO‐34catalysts declined after low‐temperature steam treatment(LTST).These results show that the texture and acid density of Cu‐SAPO‐34can be better preserved by increasing the Cu loading,although the hydrolysis of Si-O-Al bonds is inevitable.The stability of Cu ions and the stability of the SAPO framework were positively correlated at relatively low Cu loadings.However,a high Cu loading(e.g.,3.67wt%)resulted in a significant decrease in the number of isolated Cu ions.Aggregation of CuO particles also occurred during the LTST,which accounts for the decreasing NH3oxidation activities of the catalysts.Among the catalysts,Cu‐SAPO‐34with a high Si content and medium Cu content(1.37wt%)showed the lowest decrease in NH3‐SCR because its Cu2+content was well retained and its acid density was well preserved.
