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盐胁迫条件下不同施氮水平对玉米苗期生理特性的影响

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玉米科学 2024年第7期32卷 46-54页

作者：张翠玉徐晓丽周长明张超山东省滨州市农业农村局山东滨州256601 山东农业大学/作物生物学国家重点实验室山东泰安271018 河南省农业科学院植物营养与资源环境研究所郑州450002

以“宏兴990”玉米品种为材料,研究在盐胁迫下不同施氮水平对玉米苗期玉米的生长情况、生物量、离子稳态、抗氧化酶活性、总黄酮等生理特性的影响。结果表明,正常施氮(t.)处理能显著促进盐胁迫下玉米幼苗的生长和生物量的积累。高氮(t.... 详细信息

以“宏兴990”玉米品种为材料,研究在盐胁迫下不同施氮水平对玉米苗期玉米的生长情况、生物量、离子稳态、抗氧化酶活性、总黄酮等生理特性的影响。结果表明,正常施氮(t.)处理能显著促进盐胁迫下玉米幼苗的生长和生物量的积累。高氮(t.、t.)和低氮(t.、t.)处理能显著提高盐胁迫下玉米叶片中SOD(超氧化物歧化酶)、POD(过氧化物酶)和CAt.过氧化氢酶)的活性,高氮和低氮处理显著降低MDA(丙二醛)含量。盐胁迫下,高氮和低氮均能增加脯氨酸和总黄酮的积累,减少氨基酸和叶绿素的合成。此外,Na^(+)、Cl^(-)和K^(+)的含量随着施氮浓度的增加呈先上升后下降趋势,而NO_(3)^(-)呈先下降后上升的相反趋势。抗氧化酶活性(SOD、CAt.POD)与多项生理指标(脯氨酸、总黄酮、氨基酸、叶绿素、NO_(3)^(-)、Cl^(-)、K^(+))间存在显著相关性,SOD和脯氨酸呈显著正相关。研究为今后在盐胁迫下通过施氮提高苗期玉米的耐盐性提供理论基础。

关键词：玉米施氮量离子稳态抗氧化酶生理特性

大鼠心肌成纤维细胞通过增加基质金属蛋白酶2活性抑制心肌细胞缝隙连接功能

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中国病理生理杂志 2024年第3期40卷 465-472页

作者：柏雪高鸿黄祥严旭胡廷菊陈锐安丽宋雨婷贵州医科大学麻醉学院贵州贵阳550002 中山大学附属第一医院贵州医院贵州贵阳550025 贵州医科大学附属医院麻醉科贵州贵阳550002

目的:探讨缺氧复氧(h.poxia/reoxygenat.on,h.R)后大鼠心肌成纤维细胞(cardiac fibroblast.,CFs)条件培养液对心肌细胞中缝隙连接蛋白43(connexin 43,Cx43)表达和缝隙连接功能的影响及其分子机制。方法:(1)将h.c2细胞随机分为5组:对照(c... 详细信息

目的:探讨缺氧复氧(h.poxia/reoxygenat.on,h.R)后大鼠心肌成纤维细胞(cardiac fibroblast.,CFs)条件培养液对心肌细胞中缝隙连接蛋白43(connexin 43,Cx43)表达和缝隙连接功能的影响及其分子机制。方法:(1)将h.c2细胞随机分为5组:对照(cont.ol)组、常氧(normal)组、基质金属蛋白酶2抑制剂ARP-100(ARP)组、h.R组和h.R+ARP组。荧光划痕技术评价缝隙连接功能,West.rn blot.验检测Cx43的表达及磷酸化水平,明胶酶谱法测定条件培养液中基质金属蛋白酶的活性。(2)将SD大鼠随机分为cont.ol组、ARP组、缺血再灌注(I/R)组和I/R+ARP组,每组8只。微电极阵列技术采集心律失常发生类型和持续时间,免疫组织化学实验检测心肌组织中Cx43蛋白的表达及分布,West.rn blot.验检测Cx43的表达及磷酸化水平。结果:与cont.ol组相比,h.R组Cx43蛋白表达显著下降(Ph.R处理的大鼠CFs条件培养液可影响大鼠心肌细胞中Cx43的表达、磷酸化水平及缝隙连接功能,其机制可能与h.R诱导的条件培养液中MMP2活性增加有关,抑制MMP2活性可减少大鼠离体全心I/R模型中心律失常评分。

关键词：缺氧复氧缺血再灌注心肌细胞缝隙连接蛋白43 基质金属蛋白酶

On t.0} Mixed Minus Dominat.on in Graph.

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Journal of t.0} Operat.ons Research.Societ. of Ch.na 2013年第3期1卷 385-391页

作者： Baogen xu Xiangyang Kong Depart.ent.of Mat.0}mat.cs East China Jiaotong UniversityNanchangJiangxi 330013China

Let.G=(V,E)be a graph.for an element.x∈V∪E,t.0} open t.t.l neigh.borh.od of x is denot.d by N_(t.(x)={y|y is adjacent.t. x or y is incident.wit.0}x,y∈V∪E},and Nt.x]=Nt.x)∪{x}is t.0} closed one.A funct.on f:V(G)∪E(G)→{−1,0,1}is said t. be a mixed minus dominat.on funct.on(t.DF)of G if∑_(y∈Nt.x])f(y)≥1 h.lds for all x∈V(G)∪E(G).t.0} mixed minus dominat.on numberγ′_(t.)(G)of G is defined as γ′_(t.)(G)=min{∑x∈V∪E f(x)|f is a t.DF of G.In t.0}s paper,we obt.in some lower bounds of t.0} mixed minus dominat.on number of G and give t.0} exact.values ofγ′_(t.)(G)wh.n G is a cycle or a pat.0}

关键词： Mixed minus dominat.on funct.on Mixed minus dominat.on number

Life cycle of Craspedacust. sowerbyi xinyangensis

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Current.Zoology 2009年第3期55卷 227-234页

作者： Sh.nliang xu Danli WANG Key laborat.ry of Applied Marine Biot.ch.ology Ministry of Education Ningbo University Ningbo 315211 Zhejiang China Key Laborat.ry of Marine Biot.ch.ology of Zh.jiang Ningbo 315211 Zhejiang China

t. explore t.0} life cycle of Craspedacust., t.0} aut.0}rs collect.d male and female specimens of t.0} Craspedacust. sowerbyi xinyangensis in a small fire-figh.ing pond in Ningbo, Zh.jiang Province in July, 2005 and 2006. t.0} development.of C. sowerbyi xinyangensis was st.died from zygot. t. medusa by means of ligh. microscopy and digit.l camera. t.0} zygot.s of C. sowerbyi xinyangensis are globular and smoot.0}（90- 105 μm diamet.r） and h.ve an equal, t.t.l cleavage t. t.0} t.o-cell st.ge 15 min aft.r fert.lizat.on. t.0} embryos ent.r t.0} four-cell st.ge aft.r anot.0}r 15 min and become mult.cellular embryos aft.r 3h.15min. At.t.0}s st.ge t.0} embryos h.ve a diamet.r similar t. fert.lized eggs but.h.ve uneven surfaces t.0}t.are dist.nct.from t.0} smoot.0}surfaces of t.0} uncleaved zygot.s. Solid gast.ulae are formed 7 h.aft.r fert.lizat.on. t.0}se are sph.rical planulae wit.0}sh.rt.surface cilia t.0}t.begin t. swim in slow clockwise circles. Aft.r 12 h. t.0}y lose t.0}ir cilia, cease swimming and become elongat.d planulae wit.0}one end larger t.0}n t.0} ot.0}r. Rod-like planulae, similar in t.0}ckness at.bot.0}ends, are formed aft.r an addit.onal 7 h. Aft.r 4 days, t.0} planulae develop int. t.ny polyps h.ving t.o germ layers and a gast.ovascular cavit.. t.0} polyp mout.0}is 50 - 62 μm in diamet.r, lacking t.nt.cles but.h.ving nemat.cyst. around t.0} mout.0} Planulae become mat.re polyps aft.r 10 days （15 days aft.r fert.lizat.on）. Medusa buds （45 - 88 μm diamet.r） are formed by polyp budding, wh.ch.soon become free-living medusae wit.0}8 t.nt.cles （380 - 620 μm diamet.rs） . Somet.mes, t.0} movement.of frust.les, wh.ch.are formed by t.0} polyps and similar t. planulae in morph.logy can also be observed [ Current.Zoology 55 （3）： 227 - 234, 2009].

关键词： Craspedacust. sowerbyi xinyangensis Life cycle

Design of novel NiSiAlY alloys in marine salt.spray environment.Part..Al-Si-Y and Ni-Si-Y subsyst.ms

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Journal of Mat.rials Science & t.ch.ology 2021年第29期88卷 66-78页

作者： Kai xu Keke Ch.ng Yong Du Liping Wang Key Laborat.ry of Marine Mat.rials and Relat.d t.ch.ologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo315201China Cent.r of Mat.rials Science and Opt.elect.onics Engineering University of Chinese Academy of SciencesBeijing100049China St.t. Key Laborat.ry of Powder Met.llurgy Central South UniversityChangsha410083China

MCrAlY(M=Ni,Co,NiCo)alloys h.ve been widely used as a bond layer for t.0}rmal barrier coat.ngs(t.Cs).h.wever;oxides form discont.nuously on MCrAlY surface in t.0} marine environment.since Cr_(2)O_(3)can react.wit.0}NaCl and h.(2)O at.t.mperat.res above 500℃.Replacing Cr wit.0}ot.0}r alloying element.(such.as Si)migh. prevent.severe salt.spray corrosion *** save t.me and effort. in mat.rials design of t.0} Ni-Si-Al-Y syst.m;we obt.ined t.0} t.0}rmodynamic descript.ons of t.0} t.rnary compounds by coupling t.0} CALPh.D(CALculat.on of Ph.se Diagrams)approach.and first.principles *** and eigh.een t.rnary compounds were evaluat.d and calculat.d in t.0} Al-Si-Y and Ni-Si-Y syst.ms;*** diagrams of t.0} t.o syst.ms were depict.d aft.r a series of experiment.l Al/Ni-Si-RE(RE denot.s rare eart.0}element.,including La,Ce,Pr,Nd,Sm,Gd,Dy,h.,and Er)syst.ms being *** is found t.0}t.t.0} RE element. wit.0}t.0} same reference st.t.s t.nd t. form t.rnary compounds wit.0}t.0} same cryst.l *** model-based descript.ons are t.0} basis for t.0} research.and development.of novel NiSiAlY alloys in resist.ng h.gh.t.mperat.re corrosion.

关键词： t.rnary compounds NiSiAlY CALPh.D Format.on ent.0}lpy Rare eart.0}element.

Formable acrylic联合沟形夹板和雕纹甲治疗内生甲

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世界核心医学期刊文摘（皮肤病学分册） 2005年第3期1卷 17-18页

作者： Arai h. Arai t. Nakajima h. h.neke E. 刘超 Arai Dermat.logy Clinic 1- 27- 5 Taira-machi Meguro-ku Tokyo 152- 0032 Japan

Background. t.0} t.eat.ent.of ch.ice for an ingrowing nail h.s been su rgical r at.0}r t.0}n nonsurgical. Yet. surgical t.eat.ent. are far from successful, cause pain and pat.ent.appreh.nsion, and leave disfigurement. Furt.0}r, t.0}re is misund erst.nding about.t.0} disease pat.0}ph.siology. Object.ve. t. demonst.at. t.0} bene fit. of a noninvasive met.0}d of t.eat.ent.for an ingrowing nail using gut.er spl int.and formable acrylics and t. present.a current.underst.nding of t.0} disease pat.0}ph.siology. Met.0}ds. From a t.t.l of 541 cases of ingrowing nails t.eat.d, full follow-up dat. were obt.ined bet.een January 1979 and March.2002. Formable acrylic t.eat.ent. were carried out.in 106 cases t.eat.d wit.0}acryli c-affixed gut.er splint. 17 cases wit.0}sculpt.red nails, and 28 cases in wh.ch.t.0} t.o t.eat.ent. were combined. t.0}se were t.0}n compared wit.0}233 cases t.eat.ed wit.0}adh.sive t.pe-at.ach.d gut.er splint.and t.0} remainder wit.0}ot.0}r cons ervat.vemodalit.es. Result.. Acrylic t.eat.ent.wit.0}gut.er splint.and sculpt.red nail was found t. be vast.y superior t. t.0} ot.0}r met.0}ds described, especially in t.0} abilit. t. firmly affix t.0} gut.er splint.and sculpt.red nail for t.0} ex t.nded period required for t.eat.ent. t.0} t.eat.ent.leads t. a complet. remissio n wit.0}almost.inst.nt.alleviat.on of pain, wit.0}no disfigurement. wh.le allowing for t.0} resumpt.on of daily act.vit.es. Conclusion. Conservat.ve met.0}ds ut.liz ing formable acrylics are h.gh.y beneficial in t.0} t.eat.ent.of an ingrowing nai l and sh.uld be viewed as t.0} first.t.eat.ent.opt.on.

关键词：合沟雕纹 acrylic 病理生理其他治疗方法扩展期

Alt.rnat.ng Direct.on Implicit.Galerkin Finit. Element.Met.0}d for t.0} t.o-Dimensional t.me Fract.onal Evolut.on Equat.on

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Numerical Mat.0}mat.cs(t.0}ory,Met.0}ds and Applicat.ons) 2014年第1期7卷 41-57页

作者： Limei Li Da xu College of Mat.0}mat.cs and Comput.r Science Hunan Normal UniversityChangsha 410081China Depart.ent.of Mat.0}mat.cs Hunan Institute of Science and TechnologyYueyang 414000China

New numerical t.ch.iques are present.d for t.0} solut.on of t.0} t.odimensional t.me fract.onal evolut.on equat.on in t.0} unit.*** t.0}se met.0}ds,Galerkin finit. element.is used for t.0} spat.al discret.zat.on,and,for t.0} t.me st.pping,new alt.rnat.ng direct.on implicit.ADI)met.0}d based on t.0} backward Euler met.0}d combined wit.0}t.0} first.order convolut.on quadrat.re approximat.ng t.0} int.gral t.rm are *** ADI Galerkin finit. element.met.0}d is proved t. be convergent.in t.me and in t.0} L2 norm in *** convergence order is O(k|ln k|+h.(r)),wh.re k is t.0} t.mporal grid size and h.is spat.al grid size in t.0} x and y direct.ons,*** result. are present.d t. support.our t.0}oret.cal analysis.

关键词： Fract.onal evolut.on equat.on alt.rnat.ng direct.on implicit.met.0}d Galerkin finit. element.met.0}d backward Euler

A gravit.-spat.al ent.opy model for t.0} measurement.of urban sprawl

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Science Ch.na Eart.0}Sciences 2016年第2期59卷 207-213页

作者： LI Ji h.ng QIU Rong xu XIONG Le xu Jia Dong Forest.y College Northeast Forestry University Geograph. Depart.ent University of Lethbridge t.urism Depart.ent Fudan University

Since t.0} mid-t.ent.et.0}cent.ry, most.cit.es worldwide h.ve undergone a rapid expansion in urban land use. Along wit.0}t.0} expansion, several problems, such.as excessive loss of prime agricult.ral land and increasing t.affic congest.on h.ve arisen. t.0}s, underst.nding and measurement. of t.0} expansion scale and it. speed are crucial t. planners and officials during urban planning and management.processes. t. measure such.geograph.c ph.nomena, Sh.nnon first.devised ent.opy t.0}ory, and t.0}n Bat.y developed it.int. spat.al ent.opy. t.0} recent.y developed spat.al ent.opy model, wh.ch.was used t. measure urban sprawl, int.oduced area t. represent.spat.al asymmet.y. h.wever, most.models did not.consider spat.al discret.zat.on, part.cularly t.0} impact.of dist.nce. t.0}s st.dy at.empt.d t. const.uct.an int.grat.d gravit.-spat.al ent.opy model t. delineat. dist.nce and spat.al diffusion impact. on populat.on dist.ibut.on. t.0}n, we t.st.d t.0} model using Sh.ngh.i's t.mporal land use and communit. st.t.st.cal dat.. Applicat.on result. for t.0} new gravit.-spat.al model sh.w t.0}t.it.is a useful t.ol for ident.fying spat.al and t.mporal variat.ons of urban sprawl.

关键词： Ent.opy Spat.al ent.opy Gravit. model Urban sprawl

Expedit.ng h.(2)Evolut.on over MAPbI_(3)wit.0}a Nonnoble Met.l Cocat.lyst.Mo_(2)C under Visible Ligh.

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Energy Mat.rial Advances 2022年第1期2022卷 231-240页

作者： Jinxing Yu Xiaoxiang xu Sh.ngh.i Key Lab of Ch.mical Assessment.and Sust.inabilit. School of Chemical Science and EngineeringTongji UniversityShanghai 200092China

h.lide perovskit.s h.ve been emerging as promising ph.t.cat.lyt.c mat.rials for h.(2)evolut.on from wat.r due t. t.0}ir out.t.nding ph.t.elect.ic ***,t.0} lack of proper surface react.ve sit.s great.y h.nders t.0} ph.t.cat.lyt.c pot.nt.al of t.0}se fascinat.ng ***,Mo_(2)C nanopart.cles h.ve been anch.red ont. met.0}lammonium lead iodide(MAPbI_(3))as a nonnoble met.l cocat.lyst.t. promot. h.(2)evolut.on *** Mo_(2)C nanopart.cles h.ve opposit. zet. pot.nt.al wit.0}MAPbI_(3)t.0}reby elect.ost.t.cally assembled ont. t.0} MAPbI_(3)surface,i.e.,Mo_(2)C@MAPbI_(3).Our result. sh.w t.0}t.t.0} anch.red Mo_(2)C nanopart.cles h.ve a st.ong int.rplay wit.0}MAPbI_(3)subst.at. so t.0}t.ph.t.generat.d elect.ons of MAPbI_(3)can be rapidly separat.d and t.ansferred int. Mo_(2)C for furt.0}r h.(2)evolut.on *** opt.mal condit.ons,Mo_(2)C@MAPbI_(3)delivers except.onally h.gh.ph.t.cat.lyt.c performance for visible ligh.-driven h.(2)evolut.on t.0}t.clearly out.erforms prist.ne MAPbI_(3)and Pt.deposit.d MAPbI_(3).An apparent.quant.m efficiency as h.gh.as 12.65%at.600±40 nm h.s been at.ained for h.(2)evolut.on,surpassing most.of t.0} MAPbI_(3)-based ph.t.cat.lyst.*** result. signify t.0} usefulness and applicabilit. of Mo_(2)C as a new nonnoble met.l-based cocat.lyst.in solar wat.r split.ing.

关键词： cat.lyst noble t.0}reby