Spiders frequently suffer abnormal molting and subsequent death when sustained on a monotypic diet of fruit flies Drosophila melanogaster.The fruit flies lack arachidonic acid(AA),a nutrient that may be critical for s...Spiders frequently suffer abnormal molting and subsequent death when sustained on a monotypic diet of fruit flies Drosophila melanogaster.The fruit flies lack arachidonic acid(AA),a nutrient that may be critical for successful molting of spiders.To test this hypothesis,we compared the survival rates of juvenile wolf spiders,Pardosa pseudoannulata,fed on three kinds of diets,midges(Tendipes sp.),fruit flies enriched in AA and fruit flies lacking in AA.In addition,we analyzed the fatty acid composition of spiders feeding on midges and fruit flies enriched in AA and their prey.Juvenile spiders fed on midges and AA-enriched fruit flies reached full maturity without molting issues,whereas nearly all spiders fed the flies lacking in AA did not survive.Among the 35 different fatty acids,only the AA levels in both prey and spiders correlated positively with spider survival.Our findings provide compelling evidence that AA is crucial for the survival and molting of P pseudoannulata.展开更多
Excess energy from solar, nuclear or coal power stations can be stored in molten salts (MS) in the 565 °C range. At elevated temperature, large containers can be used to store energy for up to a week and generate...Excess energy from solar, nuclear or coal power stations can be stored in molten salts (MS) in the 565 °C range. At elevated temperature, large containers can be used to store energy for up to a week and generate eight hours or more, depending on the container size, of electricity to be used at night or during peak demand hours. A stable diurnal energy supply is made available by energy storage and the fluctuation experienced at thermal solar power stations caused by weather conditions is reduced. Supported by Office of Naval Research (ONR), this paper presents a survey of molten salt properties used in solar power storage, as well as the history of molten salt usage for energy storage and production. The history of molten salt usage includes past, current, and future developments involving molten salt usage for nuclear and solar energy storage and production. Density, melting temperature, viscosity, electric conductivity, surface tension, and heat capacity of various molten salts are discussed. Since costs are important factor in selecting a molten salt compound, salts costs are presented. Recommendations are made regarding the efficient use of various types of molten salt.展开更多
基金supported by the Outstanding Young and Middle-aged Science and Technology Innovation Team Project in Colleges and Universities of Hubei Province(T2022030)Guiding Project of Scientific and Technical Research Plan of Hubei Provincial Department of Education(B2022177)Open Project of Hubei Key Laboratory of Quality Control of Characteristic Fruits and Vegetables(2022K007).
文摘Spiders frequently suffer abnormal molting and subsequent death when sustained on a monotypic diet of fruit flies Drosophila melanogaster.The fruit flies lack arachidonic acid(AA),a nutrient that may be critical for successful molting of spiders.To test this hypothesis,we compared the survival rates of juvenile wolf spiders,Pardosa pseudoannulata,fed on three kinds of diets,midges(Tendipes sp.),fruit flies enriched in AA and fruit flies lacking in AA.In addition,we analyzed the fatty acid composition of spiders feeding on midges and fruit flies enriched in AA and their prey.Juvenile spiders fed on midges and AA-enriched fruit flies reached full maturity without molting issues,whereas nearly all spiders fed the flies lacking in AA did not survive.Among the 35 different fatty acids,only the AA levels in both prey and spiders correlated positively with spider survival.Our findings provide compelling evidence that AA is crucial for the survival and molting of P pseudoannulata.
文摘Excess energy from solar, nuclear or coal power stations can be stored in molten salts (MS) in the 565 °C range. At elevated temperature, large containers can be used to store energy for up to a week and generate eight hours or more, depending on the container size, of electricity to be used at night or during peak demand hours. A stable diurnal energy supply is made available by energy storage and the fluctuation experienced at thermal solar power stations caused by weather conditions is reduced. Supported by Office of Naval Research (ONR), this paper presents a survey of molten salt properties used in solar power storage, as well as the history of molten salt usage for energy storage and production. The history of molten salt usage includes past, current, and future developments involving molten salt usage for nuclear and solar energy storage and production. Density, melting temperature, viscosity, electric conductivity, surface tension, and heat capacity of various molten salts are discussed. Since costs are important factor in selecting a molten salt compound, salts costs are presented. Recommendations are made regarding the efficient use of various types of molten salt.
