Aquatic macrophytes are considered to be promising in controlling harmful cyanobacterial blooms. In this research, an aqueous extract of Sagittaria trifolia tubers was prepared to study its inhibitory effect on Microc...Aquatic macrophytes are considered to be promising in controlling harmful cyanobacterial blooms. In this research, an aqueous extract of Sagittaria trifolia tubers was prepared to study its inhibitory effect on Microcystis aeruginosa in the laboratory. Several physiological indices of M. aeruginosa, in response to the environmental stress, were analyzed. Results showed that S. trifolia tuber aqueous extract significantly inhibited the growth of M. aeruginosa in a concentration-dependent way. The highest inhibition rate reached 90% after 6 day treatment. The Chlorophyll-a concentration of M. aeruginosa cells decreased from 343.1 to314.2 μg/L in the treatment group. The activities of superoxide dismutase and peroxidase and the content of reduced glutathione in M. aeruginosa cells initially increased as a response to the oxidative stress posed by S. trifolia tuber aqueous extract, but then decreased as time prolonged. The lipid peroxidation damage of the cyanobacterial cell membranes was reflected by the malondialdehyde level, which was notably higher in the treatment group compared with the controls. It was concluded that the oxidative damage of M. aeruginosa induced by S.trifolia tuber aqueous extract might be one of the mechanisms for the inhibitory effects.展开更多
Graphene foam(GF),synthesized via Chemical Vapor Deposition(CVD),has been proven to be the ideal bulk porous material.The addition of poly(dimethylsiloxane)(PDMS)within the porous structure enables enhancement of mech...Graphene foam(GF),synthesized via Chemical Vapor Deposition(CVD),has been proven to be the ideal bulk porous material.The addition of poly(dimethylsiloxane)(PDMS)within the porous structure enables enhancement of mechanical strength and alteration of heat transfer behavior.This study focuses on the thermodynamic behavior of GF/PDMS composites during deformation,and employs stochastic modeling and neuroevolution potential(NEP)for complex material modeling with precise prediction of microscopic mechanisms governing thermal property variations.The results demonstrate that the composite with a 5%doping rate of PDMS achieves the optimal mechanical performance and shows a 7.13-fold modulation in thermal resistance during the deformation from 40%stretching to 50%compression.Findings indicate PDMS fortifies structural stability while enabling dynamic thermal conductivity modulation in GF.This research provides critical insights into the micro-mechanisms of GF/PDMS composites and offers a theoretical foundation for applications in dynamic thermal management and self-powered sensor networks.展开更多
基金financial support from the National Natural Science Foundation of China (No. 4127133)the Science and Technology Planning Project of Hunan Province, China (No. 2012SK2021)
文摘Aquatic macrophytes are considered to be promising in controlling harmful cyanobacterial blooms. In this research, an aqueous extract of Sagittaria trifolia tubers was prepared to study its inhibitory effect on Microcystis aeruginosa in the laboratory. Several physiological indices of M. aeruginosa, in response to the environmental stress, were analyzed. Results showed that S. trifolia tuber aqueous extract significantly inhibited the growth of M. aeruginosa in a concentration-dependent way. The highest inhibition rate reached 90% after 6 day treatment. The Chlorophyll-a concentration of M. aeruginosa cells decreased from 343.1 to314.2 μg/L in the treatment group. The activities of superoxide dismutase and peroxidase and the content of reduced glutathione in M. aeruginosa cells initially increased as a response to the oxidative stress posed by S. trifolia tuber aqueous extract, but then decreased as time prolonged. The lipid peroxidation damage of the cyanobacterial cell membranes was reflected by the malondialdehyde level, which was notably higher in the treatment group compared with the controls. It was concluded that the oxidative damage of M. aeruginosa induced by S.trifolia tuber aqueous extract might be one of the mechanisms for the inhibitory effects.
基金supported by the Shenzhen Science and Technology Program(JCYJ20220530141009020)the Taishan Industry Leading Talents Program(tscx202312007)+2 种基金National Natural Science Foundation of China(52372007)Natural Science Foundation of Shandong Province(ZR2023ME125)This work was also supported by AI TENNessee Initiative Seed Funds and Center for Materials Processing University-Industry Partnership Seed Grant at University of Tennessee Knoxville.
文摘Graphene foam(GF),synthesized via Chemical Vapor Deposition(CVD),has been proven to be the ideal bulk porous material.The addition of poly(dimethylsiloxane)(PDMS)within the porous structure enables enhancement of mechanical strength and alteration of heat transfer behavior.This study focuses on the thermodynamic behavior of GF/PDMS composites during deformation,and employs stochastic modeling and neuroevolution potential(NEP)for complex material modeling with precise prediction of microscopic mechanisms governing thermal property variations.The results demonstrate that the composite with a 5%doping rate of PDMS achieves the optimal mechanical performance and shows a 7.13-fold modulation in thermal resistance during the deformation from 40%stretching to 50%compression.Findings indicate PDMS fortifies structural stability while enabling dynamic thermal conductivity modulation in GF.This research provides critical insights into the micro-mechanisms of GF/PDMS composites and offers a theoretical foundation for applications in dynamic thermal management and self-powered sensor networks.
