Previous studies have shown oviposition deterring properties of 8 coconut free fatty acid(CFFA)compounds on fruit flies with different key deterrent components for different species.Here we evaluated oviposition deter...Previous studies have shown oviposition deterring properties of 8 coconut free fatty acid(CFFA)compounds on fruit flies with different key deterrent components for different species.Here we evaluated oviposition deterrence of CFFA using laboratory 2-choice bioassays against Zeugodacus cucurbitae,determined key-bioactive deterrent compounds,and evaluated their behavioral mode.Unlike other reported fruit fly species,CFFA mixture increased Z.cucurbitae oviposition when directly applied on an oviposition substrate.When tested individually in subsequent tests,4 compounds(caprylic,capric,oleic,and linoleic acids)significantly reduced the oviposition(“negative-compounds”),1 compound(stearic acid)had no effect(“neutral-compound”),and 3 compounds(lauric,myristic,and palmitic acids)stimulated the oviposition(“positive-compounds”).The 4-component negative-compound blend was effective at reducing oviposition.However,adding stearic acid to the 4-component blend(5-component blend,5c)further reduced oviposition.Adding any of the positive-compounds to the 5c resulted in loss of oviposition deterrence,suggesting the 5c as the key deterrent component blend.The blend was also effective in no-choice assays and when applied on cucumbers,a preferred host of Z.cucurbitae.When given a choice,Z.cucurbitae made 48.5%fewer visits,spent 39%less time,and oviposited 88.2%fewer eggs per min on 5c treated pumpkin agar than on control agar,suggesting that the 5c blend has both spatial repellency and contact deterrence.Given that all compounds are registered food additives and generally regarded as safe,this blend has potential application in behavioral control strategies,such as push-pull,to protect host fruit against Z.cucurbitae.展开更多
Subject Code:C02With the support by the National Natural Science Foundation of China,the research team led by Prof.Lin Jinxing(林金星)at the College of Biological Sciences&Biotechnology,Beijing Forestry University...Subject Code:C02With the support by the National Natural Science Foundation of China,the research team led by Prof.Lin Jinxing(林金星)at the College of Biological Sciences&Biotechnology,Beijing Forestry University,overcame the limitations of existing techniques and expanded the study of protein characteristics from the plasma membrane to the vacuole membranes.This study was published in Molecular Plant(2016,DOI:展开更多
Earlier this year,RedNote,a popular Chinese lifestyle and e-commerce platform,experienced a surge in inflow of U.S.-based users.The app became a space for cross-cultural exchange,where people from both countries discu...Earlier this year,RedNote,a popular Chinese lifestyle and e-commerce platform,experienced a surge in inflow of U.S.-based users.The app became a space for cross-cultural exchange,where people from both countries discussed topics of mutual interest.One of the most frequently asked questions from American users was whether China operates a system that tracks citizens,behavior and assigns a"social credit score,"influencing their access to services or purchases.展开更多
"Active" components can be introduced into a passive system to completely change its physical behavior from its typical behavior at thermodynamic equilibrium. To reveal the interaction mechanisms between ind..."Active" components can be introduced into a passive system to completely change its physical behavior from its typical behavior at thermodynamic equilibrium. To reveal the interaction mechanisms between individuals, researchers have designed unique self-propelled particles to mimic the collective behavior of biological systems. This review focuses on recent theoretical and experimental advances in the study of self-propelled particle systems and their individual and collective behaviors. The potential applications of active particles in chemical, biological and environmental sensing and single particle imaging are discussed.展开更多
基金supported in part by funding from Plant Protection Act 7721 funding to Dong H.Cha,Amy Roda,Junwei Zhu,and Paul Kendra(#2021-6.1171)Jia-Wei Tay and Dong H.Cha(AP22PPQS&T00C067)a CRADA with Marron Bio Innovations,Inc to Dong H.Cha and Junwei Zhu(#58-2040-0-004)。
文摘Previous studies have shown oviposition deterring properties of 8 coconut free fatty acid(CFFA)compounds on fruit flies with different key deterrent components for different species.Here we evaluated oviposition deterrence of CFFA using laboratory 2-choice bioassays against Zeugodacus cucurbitae,determined key-bioactive deterrent compounds,and evaluated their behavioral mode.Unlike other reported fruit fly species,CFFA mixture increased Z.cucurbitae oviposition when directly applied on an oviposition substrate.When tested individually in subsequent tests,4 compounds(caprylic,capric,oleic,and linoleic acids)significantly reduced the oviposition(“negative-compounds”),1 compound(stearic acid)had no effect(“neutral-compound”),and 3 compounds(lauric,myristic,and palmitic acids)stimulated the oviposition(“positive-compounds”).The 4-component negative-compound blend was effective at reducing oviposition.However,adding stearic acid to the 4-component blend(5-component blend,5c)further reduced oviposition.Adding any of the positive-compounds to the 5c resulted in loss of oviposition deterrence,suggesting the 5c as the key deterrent component blend.The blend was also effective in no-choice assays and when applied on cucumbers,a preferred host of Z.cucurbitae.When given a choice,Z.cucurbitae made 48.5%fewer visits,spent 39%less time,and oviposited 88.2%fewer eggs per min on 5c treated pumpkin agar than on control agar,suggesting that the 5c blend has both spatial repellency and contact deterrence.Given that all compounds are registered food additives and generally regarded as safe,this blend has potential application in behavioral control strategies,such as push-pull,to protect host fruit against Z.cucurbitae.
文摘Subject Code:C02With the support by the National Natural Science Foundation of China,the research team led by Prof.Lin Jinxing(林金星)at the College of Biological Sciences&Biotechnology,Beijing Forestry University,overcame the limitations of existing techniques and expanded the study of protein characteristics from the plasma membrane to the vacuole membranes.This study was published in Molecular Plant(2016,DOI:
文摘Earlier this year,RedNote,a popular Chinese lifestyle and e-commerce platform,experienced a surge in inflow of U.S.-based users.The app became a space for cross-cultural exchange,where people from both countries discussed topics of mutual interest.One of the most frequently asked questions from American users was whether China operates a system that tracks citizens,behavior and assigns a"social credit score,"influencing their access to services or purchases.
基金supported by the National Natural Science Foundation of China (21425519)the Tsinghua University Startup Fund
文摘"Active" components can be introduced into a passive system to completely change its physical behavior from its typical behavior at thermodynamic equilibrium. To reveal the interaction mechanisms between individuals, researchers have designed unique self-propelled particles to mimic the collective behavior of biological systems. This review focuses on recent theoretical and experimental advances in the study of self-propelled particle systems and their individual and collective behaviors. The potential applications of active particles in chemical, biological and environmental sensing and single particle imaging are discussed.
