Lateral branching is an important determinant of shoot architecture and crop yield. The plant hormone strigolactone (SL) inhibits lateral bud outgrowth in various plant species. Deficiencies in SL biosynthesis and sig...Lateral branching is an important determinant of shoot architecture and crop yield. The plant hormone strigolactone (SL) inhibits lateral bud outgrowth in various plant species. Deficiencies in SL biosynthesis and signal transduction result in excessive outgrowth of lateral buds (Stirnberg et al., 2002;Sorefan et al., 2003).展开更多
The decomposition of plant litter is a key process of litter decomposition to global climate warming in plateau in the flows of energy and nutrients in ecosystems. However, the response wetlands remains largely unknow...The decomposition of plant litter is a key process of litter decomposition to global climate warming in plateau in the flows of energy and nutrients in ecosystems. However, the response wetlands remains largely unknown. In this study, we conducted a one-year litter decomposition experiment along an elevation gradient from 1891 m to 3260 m on the Yurman Plateau of Southwest China, using different litter types to determine the influences of climate change, litter quality and microenvironment on the decomposition rate. The results showed that the average decomposition rate （K） increased from 0.608 to 1.152, and the temperature sensitivity of litter mass losses was approximately 4.98%/℃ along the declining elevation gradient. Based on a correlation analysis, N concentrations and C ： N ratios in the litter were the best predictors of the decomposition rate, with significantly positive and negative correlations, respectively. Additionally, the cumulative effects of decomposition were clearly observed in the mixtures of Scirpus tabernaemontani and Zizania caduciflora. Moreover, the litter decomposition rate in the water was higher than that in the sediment, especially in high-elevation areas where the microenvironment was significantly affected by temperature. These results suggest that future climate warming will have significant impacts on plateau wetlands, which have important fimctions in biogeochemical cycling in cold highland ecosystems.展开更多
The double Michael reactions between benzofuran-3-one or 1-indone and symmetric dienones in the presence of catalytic ionic liquids were successfully developed and spiro[benzofuran-2, 1′-cyclohexane]-3-one or spiro[c...The double Michael reactions between benzofuran-3-one or 1-indone and symmetric dienones in the presence of catalytic ionic liquids were successfully developed and spiro[benzofuran-2, 1′-cyclohexane]-3-one or spiro[cyclo- hexane-1,2′-indene]-1′,4（3′H）-dione derivatives containing a spiro quaternary stereogenic center, which widely exist in biologically active products and building blocks in organic synthesis, were obtained in excellent yields （up to 99%）. This catalytic system was also extended to the double Michael reaction of less reactive 1-indone and the desired products were also obtained in 31%-62% yields. The catalytic system was highly active and efficient for a broad of substrates under mild conditions.展开更多
Dear Editor,Coronavirus disease 2019(COVID-19)is a type of novel coronavirus and no specific treatment is currently available.Apart from damages to the lung,COVID-19 is also able to trigger liver injury.Numerous obser...Dear Editor,Coronavirus disease 2019(COVID-19)is a type of novel coronavirus and no specific treatment is currently available.Apart from damages to the lung,COVID-19 is also able to trigger liver injury.Numerous observational studies have revealed that elevation of liver enzymes,including alanine aminotransferase(ALT)and aspartate aminotransferase(AST),was detected in some COVID-19 patients,especially in severe cases.1 Unfortunately,the underlying mechanisms and risk factors of COVID-19-induced liver damage have not been completely elucidated.Therefore,identification of novel risk factors in liver injury of COVID-19 patients is essential for the prevention and treatment of liver damage.In this study,192 patients with COVID-19 hospitalized in Chongqing Public Health Center were recruited to identify the risk factors in COVID-19 patients with liver injury.展开更多
基金supported by grants from the Ministry of Agriculture of China (2016ZX08009003)the National Natural Science Foundation of China (31670279, 31770398)the Ministry of Science and Technology of China (2013CBA01400)。
文摘Lateral branching is an important determinant of shoot architecture and crop yield. The plant hormone strigolactone (SL) inhibits lateral bud outgrowth in various plant species. Deficiencies in SL biosynthesis and signal transduction result in excessive outgrowth of lateral buds (Stirnberg et al., 2002;Sorefan et al., 2003).
基金Under the auspices of Special Projects of National Key Basic Research Program of China(No.2012CB426509)National Natural Science Foundation of China(No.40971285,31370497,31500409)Yunnan Innovation Talents of Science and Technology Plan of China(No.2012HC007)
文摘The decomposition of plant litter is a key process of litter decomposition to global climate warming in plateau in the flows of energy and nutrients in ecosystems. However, the response wetlands remains largely unknown. In this study, we conducted a one-year litter decomposition experiment along an elevation gradient from 1891 m to 3260 m on the Yurman Plateau of Southwest China, using different litter types to determine the influences of climate change, litter quality and microenvironment on the decomposition rate. The results showed that the average decomposition rate （K） increased from 0.608 to 1.152, and the temperature sensitivity of litter mass losses was approximately 4.98%/℃ along the declining elevation gradient. Based on a correlation analysis, N concentrations and C ： N ratios in the litter were the best predictors of the decomposition rate, with significantly positive and negative correlations, respectively. Additionally, the cumulative effects of decomposition were clearly observed in the mixtures of Scirpus tabernaemontani and Zizania caduciflora. Moreover, the litter decomposition rate in the water was higher than that in the sediment, especially in high-elevation areas where the microenvironment was significantly affected by temperature. These results suggest that future climate warming will have significant impacts on plateau wetlands, which have important fimctions in biogeochemical cycling in cold highland ecosystems.
文摘The double Michael reactions between benzofuran-3-one or 1-indone and symmetric dienones in the presence of catalytic ionic liquids were successfully developed and spiro[benzofuran-2, 1′-cyclohexane]-3-one or spiro[cyclo- hexane-1,2′-indene]-1′,4（3′H）-dione derivatives containing a spiro quaternary stereogenic center, which widely exist in biologically active products and building blocks in organic synthesis, were obtained in excellent yields （up to 99%）. This catalytic system was also extended to the double Michael reaction of less reactive 1-indone and the desired products were also obtained in 31%-62% yields. The catalytic system was highly active and efficient for a broad of substrates under mild conditions.
基金supported by the Chongqing Special Research Project for Prevention and Control of Novel Coronavirus Pneumonia(No.cstc2020jscx-fyzx0103).
文摘Dear Editor,Coronavirus disease 2019(COVID-19)is a type of novel coronavirus and no specific treatment is currently available.Apart from damages to the lung,COVID-19 is also able to trigger liver injury.Numerous observational studies have revealed that elevation of liver enzymes,including alanine aminotransferase(ALT)and aspartate aminotransferase(AST),was detected in some COVID-19 patients,especially in severe cases.1 Unfortunately,the underlying mechanisms and risk factors of COVID-19-induced liver damage have not been completely elucidated.Therefore,identification of novel risk factors in liver injury of COVID-19 patients is essential for the prevention and treatment of liver damage.In this study,192 patients with COVID-19 hospitalized in Chongqing Public Health Center were recruited to identify the risk factors in COVID-19 patients with liver injury.
