The durability of bamboo based on its chemical and mechanical properties is a crucial consideration for the wood-based industry due to its vulnerability to insects and microorganisms.We investigated the dynamic change...The durability of bamboo based on its chemical and mechanical properties is a crucial consideration for the wood-based industry due to its vulnerability to insects and microorganisms.We investigated the dynamic changes of chemical and mechanical properties of Phyllostachys edulis under air-dry and water storage conditions for 3,6 and 12 months respectively.The chemical properties of P.edulis bamboo culms varied with culm age but insignificantly with culm height.The mechanical properties of P.edulis culms showed an increasing trend with culm age.Water storage condition decreased the ash,SiO2 and lignin content,but increased the ethanol-benzene extracts.It also created an anaerobic environment for bamboo culms in which only anaerobic respiration was possible contributing to reducing the content of soluble sugar and starch,thereby beneficial for decreasing the damage from insects and microorganisms.Moreover,the water storage conditions could maintain culm mechanical performance better.Therefore,the indigenous practice of local people to store bamboo culms in ponds has good science behind it and water storage practices of bamboo culms was recommended.展开更多
LiNi0.85CO0.15-xAlxO2 samples （x=0.025, 0.05 and 0.10） were prepared by solid state reaction at 725℃ for 24 h from LiOH-H2O, Ni2O3, Co2O3 and Al（OH）3 under oxygen flow. Layered LiNiO2 simultaneously doped by Co-A...LiNi0.85CO0.15-xAlxO2 samples （x=0.025, 0.05 and 0.10） were prepared by solid state reaction at 725℃ for 24 h from LiOH-H2O, Ni2O3, Co2O3 and Al（OH）3 under oxygen flow. Layered LiNiO2 simultaneously doped by Co-Al has been tried to improve the cathode performance. The results showed that substitution of optimum amount Al and Co for the Ni in LiNiO2 definitely had some beneficial effect on increasing the capacity and cycling behavior. When increasing x in LiNio.85CO0.15-xAlxO2, the initial discharge capacity decreased and its cyclability increased. Compromising high specific capacity and good cyclability, the optimum x in LiNi0.85Co0.15-xAlxO2 was x=0.05. As a consequence, LiNi0.85Co0.15-xAlxO2 had the first discharge capacity of 186.2 mAh/g and a capacity of 180.1 mAh/g after 10 cycles. Differential capacity vs voltage curves indicated that the co-doped LiNiO2 showed suppression of the phase transitions as compared with LiNiO2.展开更多
Artemisia argyi is a traditional Chinese food and medicine which can improve multiple diseases such as asthma and gastrointestinal disorders.However,whether the beneficial bioactivities are associated with microbial f...Artemisia argyi is a traditional Chinese food and medicine which can improve multiple diseases such as asthma and gastrointestinal disorders.However,whether the beneficial bioactivities are associated with microbial fermentation remain unknown.The objective of this study was to investigate the effects of fermentation on bioactive compounds,antioxidant activity,and flavor characteristics of Artemisia argyi fermentation liquid(AAFL-LP)by an autochthonous strain,Lactiplantibacillus plantarum WLPL01.L.plantarum WLPL01 was found to utilize sugars and flavonoids to produce abundant organic acids,such as lactic acid and malic acid,improve antioxidant activity of Artemisia argyi including total superoxide dismutase content,1,1-diphenyl-2-picrylhydrazyl(DPPH)radical-scavenging capacity,and Fe-reducing antioxidant power,decrease largely bitter taste notes such as leucine,isoleucine,and phenylalanine,and enhance fruity,sweet,and flora notes such as terpenes and esters of AAFL-LP.Collectively,L.plantarum WLPL01 could improve the functionality of A.argyi and the flavor of the product,suggesting it a promising candidate in developing functional A.argyi food.展开更多
Under the condition of normalized epidemic,how athletes train and compete well has been in the spotlight.This article reported the symptom,hospitalization and training situation of seven confirmed cases of coronavirus...Under the condition of normalized epidemic,how athletes train and compete well has been in the spotlight.This article reported the symptom,hospitalization and training situation of seven confirmed cases of coronavirusdisease-2019(COVID-19)among Chinese national teams.Moreover,the paper summarized the experience of Chinese national teams in terms of epidemic prevention and control,treatment of infection,and safe return to play.Through a scientific combination of medication and non-medical treatment,seven athletes were all discharged from the hospital.These discharged athletes underwent strict isolation and scientific training before returning to sports teams.Before returning to play,continuous monitoring of physical and mental condition was required.All seven athletes returned to play safely and performed excellently.As for hosting large-scale sporting events,the entire enclosed-loop management from immigration to competition was proposed in this paper.This study could serve as a standard of epidemic prevention and control,treatment for infection and safe return to play during competition and training around the world.展开更多
基金This work was jointly supported by Yunnan Fundamental Research Project of 2020(202001AT070108)Yunnan Provincial Joint Special Project for Basic Research in Agriculture(No.2017FG001-092)+1 种基金Scientific Research Start-up Fund Project of Southwest Forestry University(No.111817)Yunnan Provincial Department of Education Fund for Scientific Research(No.2020J0413).
文摘The durability of bamboo based on its chemical and mechanical properties is a crucial consideration for the wood-based industry due to its vulnerability to insects and microorganisms.We investigated the dynamic changes of chemical and mechanical properties of Phyllostachys edulis under air-dry and water storage conditions for 3,6 and 12 months respectively.The chemical properties of P.edulis bamboo culms varied with culm age but insignificantly with culm height.The mechanical properties of P.edulis culms showed an increasing trend with culm age.Water storage condition decreased the ash,SiO2 and lignin content,but increased the ethanol-benzene extracts.It also created an anaerobic environment for bamboo culms in which only anaerobic respiration was possible contributing to reducing the content of soluble sugar and starch,thereby beneficial for decreasing the damage from insects and microorganisms.Moreover,the water storage conditions could maintain culm mechanical performance better.Therefore,the indigenous practice of local people to store bamboo culms in ponds has good science behind it and water storage practices of bamboo culms was recommended.
基金This work was supported by the National Natural Science Foundation of China （No. 29833090）.
文摘LiNi0.85CO0.15-xAlxO2 samples （x=0.025, 0.05 and 0.10） were prepared by solid state reaction at 725℃ for 24 h from LiOH-H2O, Ni2O3, Co2O3 and Al（OH）3 under oxygen flow. Layered LiNiO2 simultaneously doped by Co-Al has been tried to improve the cathode performance. The results showed that substitution of optimum amount Al and Co for the Ni in LiNiO2 definitely had some beneficial effect on increasing the capacity and cycling behavior. When increasing x in LiNio.85CO0.15-xAlxO2, the initial discharge capacity decreased and its cyclability increased. Compromising high specific capacity and good cyclability, the optimum x in LiNi0.85Co0.15-xAlxO2 was x=0.05. As a consequence, LiNi0.85Co0.15-xAlxO2 had the first discharge capacity of 186.2 mAh/g and a capacity of 180.1 mAh/g after 10 cycles. Differential capacity vs voltage curves indicated that the co-doped LiNiO2 showed suppression of the phase transitions as compared with LiNiO2.
基金supported by National Natural Science Foundation of China(grant no.NSF 32060030,Beijing,China).
文摘Artemisia argyi is a traditional Chinese food and medicine which can improve multiple diseases such as asthma and gastrointestinal disorders.However,whether the beneficial bioactivities are associated with microbial fermentation remain unknown.The objective of this study was to investigate the effects of fermentation on bioactive compounds,antioxidant activity,and flavor characteristics of Artemisia argyi fermentation liquid(AAFL-LP)by an autochthonous strain,Lactiplantibacillus plantarum WLPL01.L.plantarum WLPL01 was found to utilize sugars and flavonoids to produce abundant organic acids,such as lactic acid and malic acid,improve antioxidant activity of Artemisia argyi including total superoxide dismutase content,1,1-diphenyl-2-picrylhydrazyl(DPPH)radical-scavenging capacity,and Fe-reducing antioxidant power,decrease largely bitter taste notes such as leucine,isoleucine,and phenylalanine,and enhance fruity,sweet,and flora notes such as terpenes and esters of AAFL-LP.Collectively,L.plantarum WLPL01 could improve the functionality of A.argyi and the flavor of the product,suggesting it a promising candidate in developing functional A.argyi food.
基金supported by the China Association for Science and Technology(Project Number:2021ZZGJB070734)National Key Research and Development Program of China(Project Number:2018YFF0300604)National Key Research and Development Program of China(Project Number:2019YFF0301703).
文摘Under the condition of normalized epidemic,how athletes train and compete well has been in the spotlight.This article reported the symptom,hospitalization and training situation of seven confirmed cases of coronavirusdisease-2019(COVID-19)among Chinese national teams.Moreover,the paper summarized the experience of Chinese national teams in terms of epidemic prevention and control,treatment of infection,and safe return to play.Through a scientific combination of medication and non-medical treatment,seven athletes were all discharged from the hospital.These discharged athletes underwent strict isolation and scientific training before returning to sports teams.Before returning to play,continuous monitoring of physical and mental condition was required.All seven athletes returned to play safely and performed excellently.As for hosting large-scale sporting events,the entire enclosed-loop management from immigration to competition was proposed in this paper.This study could serve as a standard of epidemic prevention and control,treatment for infection and safe return to play during competition and training around the world.
