With the bioguided fractionation of the ethanol extracts from the leaves of Momordica charantia, we obtained two most active compounds against the feeding of the diamondback moth, Plutella xylostella larvae. The antif...With the bioguided fractionation of the ethanol extracts from the leaves of Momordica charantia, we obtained two most active compounds against the feeding of the diamondback moth, Plutella xylostella larvae. The antifeedant activity of momordicine Ⅰ and momordicine Ⅱ against the second and the third instar larvae of Plutella xylostella were tested using leaf discs of cabbage in the laboratory. The results showed that momordicin Ⅰ and momordicin Ⅱ had significant antifeedant activity on the larvae of P. xylostella, and momordicin Ⅱ was more active than momordicin Ⅰ. The concentrations for 50% antifeedant effects （AFC50） of momordicin Ⅱ against the second and the third instar larvae of P. xylostella were 76.69 and 116.24μg mL^-1, whereas that of momordicin I was 144.08 and 168.42μg mL^-1, respectively. In addition, momordicin Ⅰ and momordicin Ⅱ had significant inhibitive effect on the rate of weight gain and survival of P. xylostella larvae.展开更多
The pledge of achieving carbon peak before 2030 and carbon neutrality before 2060 is a strategic decision that responds to the inherent needs of China’s sustainable and high-quality development,and is an important dr...The pledge of achieving carbon peak before 2030 and carbon neutrality before 2060 is a strategic decision that responds to the inherent needs of China’s sustainable and high-quality development,and is an important driving force for promoting China’s ecological civilization constructions.As the consumption of fossil fuel energy is responsible for more than 90%of China’s greenhouse gases emissions,policies focusing on energy transition are vital for China accomplishing the goal of carbon neutrality.Considering the fact that China’s energy structure is dominated by fossil fuels,especially coal,it is urgent to accelerate the low-carbon transition of the energy system in a relatively short time,and dramatically increase the proportion of clean energy in the future energy supply.Although China has made notable progress in the clean energy transition in the past,its path to carbon neutrality still faces many significant challenges.During the process of energy transformation,advanced technologies and greater investment will play essential parts in this extensive and profound systemic reform for China’s economy and society.In the meantime,these changes will create immense economic opportunities and geopolitical advantages.展开更多
基金the grants from the National Natural Science Foundation of China (39930120)
文摘With the bioguided fractionation of the ethanol extracts from the leaves of Momordica charantia, we obtained two most active compounds against the feeding of the diamondback moth, Plutella xylostella larvae. The antifeedant activity of momordicine Ⅰ and momordicine Ⅱ against the second and the third instar larvae of Plutella xylostella were tested using leaf discs of cabbage in the laboratory. The results showed that momordicin Ⅰ and momordicin Ⅱ had significant antifeedant activity on the larvae of P. xylostella, and momordicin Ⅱ was more active than momordicin Ⅰ. The concentrations for 50% antifeedant effects （AFC50） of momordicin Ⅱ against the second and the third instar larvae of P. xylostella were 76.69 and 116.24μg mL^-1, whereas that of momordicin I was 144.08 and 168.42μg mL^-1, respectively. In addition, momordicin Ⅰ and momordicin Ⅱ had significant inhibitive effect on the rate of weight gain and survival of P. xylostella larvae.
文摘The pledge of achieving carbon peak before 2030 and carbon neutrality before 2060 is a strategic decision that responds to the inherent needs of China’s sustainable and high-quality development,and is an important driving force for promoting China’s ecological civilization constructions.As the consumption of fossil fuel energy is responsible for more than 90%of China’s greenhouse gases emissions,policies focusing on energy transition are vital for China accomplishing the goal of carbon neutrality.Considering the fact that China’s energy structure is dominated by fossil fuels,especially coal,it is urgent to accelerate the low-carbon transition of the energy system in a relatively short time,and dramatically increase the proportion of clean energy in the future energy supply.Although China has made notable progress in the clean energy transition in the past,its path to carbon neutrality still faces many significant challenges.During the process of energy transformation,advanced technologies and greater investment will play essential parts in this extensive and profound systemic reform for China’s economy and society.In the meantime,these changes will create immense economic opportunities and geopolitical advantages.
