摘要：本研究以草地早熟禾(Poa pratensis)‘Midnight II’为材料,采用50%的富氢水(Hydrogen-rich water,HRW)叶片喷施及灌根的方法,分析HRW处理对200 mM NaCl胁迫条件下草地早熟禾叶片干物质含量、相对含水量、叶绿素含量、电解率外渗(Electrolyte leakage,EL)及抗氧化酶活性的影响。结果表明:HRW处理显著增加了盐胁迫条件下细胞的持水能力,提高了叶片的叶绿素含量,降低了EL值;通过分析0 d,5 d和20 d盐胁迫条件下草地早熟禾叶片活性氧(Reactive oxygen species,ROS)和丙二醛含量,抗氧化酶活性以及抗氧化酶基因表达发现,在盐胁迫,尤其是长时间盐胁迫条件下,HRW处理显著降低了ROS含量,增加细胞膜稳定性,同时提高了长时间盐胁迫条件下部分抗氧化酶的活性,且诱导了抗氧化酶基因CAT2,APX1,MR的下调表达。研究结果表明,在HRW对草地早熟禾耐盐性的影响中,ROS的含量变化可能发挥关键作用。研究结果对草坪草耐盐生理以及氢气生物学的研究具有一定的指导意义。

摘要：Step-scheme(S-scheme)heterojunctions in photocatalysts can provide novel and practical insight on promoting photogenerated carrier *** latter is critical in controlling the overall efficiency in one-step photoexcitation *** this study,a nanosized BiVO4/Bi0.6Y0.4VO4 solid solution was prepared by a coprecipitation method following with hydrothermal or calcination *** S-scheme heterojunction was fabricated by in-situ pressure-induced transformations of bismuth vanadate from the tetragonal zircon phase to the monoclinic scheelite phase,which led to the formation of BiVO4 nanoparticles with a diameter of approximately 5 nm on the surface of BiVO_(4)/Bi_(0.6)Y_(0.4)VO_(4)/Bi_(0.6)Y_(0.4)VO_(4) with S-scheme heterojunctions showed significantly enhanced photocatalytic overall water splitting activity compared with using bare BiVO_(4)/Bi_(0.6)Y_(0.4)VO_(4).Characterization of the carrier dynamics demonstrated that a superior carrier separation through S-type heterojunctions might have caused the enhanced overall water splitting(OWS)*** photovoltage spectra and the results of selective photodeposition experiments indicated that the photogenerated holes mainly migrated to the BiVO4 nanoparticles in the *** confirmed that the charge transfer route corresponds to an S-scheme rather than a type-II heterojunction mechanism under light *** study presents a facile and efficient strategy to construct S-scheme heterojunctions through a pressure-induced phase *** results demonstrated that S-scheme junctions composed of different crystalline phases can boost the carrier separation capacity and eventually improve the photocatalytic OWS activity.

摘要：The commercialization of proton exchange membrane fuel cells(PEMFCs)could provide a cleaner energy society in the near ***,the sluggish reaction kinetics and harsh conditions of the oxygen reduction reaction affect the durability and cost of *** previous reports on Pt-based electrocatalyst designs have focused more on improving their activity;however,with the commercialization of PEMFCs,durability has received increasing ***-depth insight into the structural evolution of Pt-based electrocatalysts throughout their lifecycle can contribute to further optimization of their activity and *** development of in situ electron microscopy and other in situ techniques has promoted the elucidation of the evolution *** mini review highlights recent advances in the structural evolution of Pt-based *** mechanisms are adequately discussed,and some methods to inhibit or exploit the structural evolution of the catalysts are also briefly reviewed.