Developing biomimetic soft materials that display stimuli responsiveness using solely inorganic materials has been regarded as a challenge owing to that such materials?properties typically vary from those of living or...Developing biomimetic soft materials that display stimuli responsiveness using solely inorganic materials has been regarded as a challenge owing to that such materials?properties typically vary from those of living organisms.Traditionally,biomimetic soft materials have been developed using organic materials or inorganic materials modified with organic small molecules.In this study,we prepared cerium phosphate nanofibers(CePO_(4)NFs)by using inorganic agents only without further modification.The CePO_(4)NFs demonstrate sol-ge switching properties in response to pH value,allowing them to form a gel under high hydroxide ion(OH^(-))concentrations and turn back into sol under low OH^(-)concentrations.The formation of gel could be ascribed to the physical cross-linking of the nanofibers induced by the attractive electrostatic force of OH^(-)and surface Ce^(3+).As a result,CePO_(4)NFs are able to form a gel when in contac with blood of high pH value for hemostasis.This specific clotting mechanism makes them better candidates for hemostasis of heavy bleeding.展开更多
Seed treatment with endophytic fungi has been regarded as an effective method for plant parasitic nematode control.Endophytic fungi from cucumber seedlings were isolated and screened for their potential to be used as ...Seed treatment with endophytic fungi has been regarded as an effective method for plant parasitic nematode control.Endophytic fungi from cucumber seedlings were isolated and screened for their potential to be used as seed treatment agents against Meloidogyne incognita.Among the 294 isolates screened,23 significantly reduced galls formed by M.incognita in greenhouse test.The 10 most effective isolates were Fusarium(5),Trichoderma(1),Chaetomium(1),Acremonium(1),Paecilomyces(1),and Phyllosticta(1) .Their control efficacies were repeatedly tested and their colonizations as well as in vitro activity against M.incognita were studied.They reduced the number of galls by 24.0%-58.4%in the first screening and 15.6%-44.3%in the repeated test,respectively.Phyllosticta Ph511 and Chaetomium Ch1001 had high colonizations on both the roots and the aboveground parts of cucumber seedlings.Fusarium isolates had colonization preference on the roots,their root colonizations ranging from 20.1%to 47.3%of the total root area.Trichoderma Tr882,Paecilomyces Pa972,and Acremonium Ac985 had low colonizations on both the roots and the aboveground parts.Acremonium Ac985,Chaetomium Ch1001,Paecilomyces Pa972,and Phyllosticta Ph511 produced compounds affecting motility of the second stage juveniles of M.incognita.Based on these results,Chae-tomium Ch1001 was considered to have the highest potential as a seed treatment agent for M.incognita biocontrol.展开更多
SmFealloy is the intermediate material for the preparation of SmFeNx(x ≈ 3); thus, the synthesis of pure SmFemother alloy is the key to obtaining highperformance SmFeNx. Reduction-diffusion(R-D) is a cost-effective m...SmFealloy is the intermediate material for the preparation of SmFeNx(x ≈ 3); thus, the synthesis of pure SmFemother alloy is the key to obtaining highperformance SmFeNx. Reduction-diffusion(R-D) is a cost-effective method. In this study, the R-D process of synthesizing SmFewas analyzed by scanning electron microscopy(SEM), energy-dispersive X-ray spectroscopy(EDX), X-ray diffraction(XRD), and X-ray fluorescence(XRF). Furthermore, the influences of the tightness of compacted reactants, the compensation amount of SmO,and the particle size of Fe on the formation of SmFewere discussed from the aspects of the three raw materials.The results show that Sm reduced from SmOreacts with Fe particles to form intermetallic compound SmFedirectly in the R-D reaction process of preparing SmFe;the generation of Sm and its migration to the surface of Fe particles control the reaction rate; a proper tightness of compacted reactants is necessary for ensuring the purity of SmFeproduct; pure SmFecan be obtained when the compensation of SmOis 33 % of the stoichiometry; and the sufficiency of the reaction improves with the decrease in the size of Fe powders under the same reaction condition.展开更多
基金financially supported in part by the Natural Science Foundation of Zhejiang Province(No.LR22E010001)the National Natural Science Foundation of China(No.52073258)+1 种基金the Fundamental Research Funds for the Provincial Universities of Zhejiang(No.RF-B2022006)the R&D Program of Zhejiang University of Technology(No.KYY-HX-20190730)。
文摘Developing biomimetic soft materials that display stimuli responsiveness using solely inorganic materials has been regarded as a challenge owing to that such materials?properties typically vary from those of living organisms.Traditionally,biomimetic soft materials have been developed using organic materials or inorganic materials modified with organic small molecules.In this study,we prepared cerium phosphate nanofibers(CePO_(4)NFs)by using inorganic agents only without further modification.The CePO_(4)NFs demonstrate sol-ge switching properties in response to pH value,allowing them to form a gel under high hydroxide ion(OH^(-))concentrations and turn back into sol under low OH^(-)concentrations.The formation of gel could be ascribed to the physical cross-linking of the nanofibers induced by the attractive electrostatic force of OH^(-)and surface Ce^(3+).As a result,CePO_(4)NFs are able to form a gel when in contac with blood of high pH value for hemostasis.This specific clotting mechanism makes them better candidates for hemostasis of heavy bleeding.
基金Project supported by the German Academic Exchange Agency (DAAD),the China Scholarship Council(CSC),the Special Fund for Agro-scientific Research in the Public Interest(No.nyhezx07-050-6)the Science and Technology Department of Zhejiang Province of China(No.2008C22062)the Zhejiang Provincial Natural Science Foundation of China(No.R307396)
文摘Seed treatment with endophytic fungi has been regarded as an effective method for plant parasitic nematode control.Endophytic fungi from cucumber seedlings were isolated and screened for their potential to be used as seed treatment agents against Meloidogyne incognita.Among the 294 isolates screened,23 significantly reduced galls formed by M.incognita in greenhouse test.The 10 most effective isolates were Fusarium(5),Trichoderma(1),Chaetomium(1),Acremonium(1),Paecilomyces(1),and Phyllosticta(1) .Their control efficacies were repeatedly tested and their colonizations as well as in vitro activity against M.incognita were studied.They reduced the number of galls by 24.0%-58.4%in the first screening and 15.6%-44.3%in the repeated test,respectively.Phyllosticta Ph511 and Chaetomium Ch1001 had high colonizations on both the roots and the aboveground parts of cucumber seedlings.Fusarium isolates had colonization preference on the roots,their root colonizations ranging from 20.1%to 47.3%of the total root area.Trichoderma Tr882,Paecilomyces Pa972,and Acremonium Ac985 had low colonizations on both the roots and the aboveground parts.Acremonium Ac985,Chaetomium Ch1001,Paecilomyces Pa972,and Phyllosticta Ph511 produced compounds affecting motility of the second stage juveniles of M.incognita.Based on these results,Chae-tomium Ch1001 was considered to have the highest potential as a seed treatment agent for M.incognita biocontrol.
基金financially supported by the Natural Science Foundation of Zhejiang Province, China (No. Y406406)the Xinmiao Talent Project of Zhejiang Province, China (No. 2014R403057)
文摘SmFealloy is the intermediate material for the preparation of SmFeNx(x ≈ 3); thus, the synthesis of pure SmFemother alloy is the key to obtaining highperformance SmFeNx. Reduction-diffusion(R-D) is a cost-effective method. In this study, the R-D process of synthesizing SmFewas analyzed by scanning electron microscopy(SEM), energy-dispersive X-ray spectroscopy(EDX), X-ray diffraction(XRD), and X-ray fluorescence(XRF). Furthermore, the influences of the tightness of compacted reactants, the compensation amount of SmO,and the particle size of Fe on the formation of SmFewere discussed from the aspects of the three raw materials.The results show that Sm reduced from SmOreacts with Fe particles to form intermetallic compound SmFedirectly in the R-D reaction process of preparing SmFe;the generation of Sm and its migration to the surface of Fe particles control the reaction rate; a proper tightness of compacted reactants is necessary for ensuring the purity of SmFeproduct; pure SmFecan be obtained when the compensation of SmOis 33 % of the stoichiometry; and the sufficiency of the reaction improves with the decrease in the size of Fe powders under the same reaction condition.
