简介:Inthispaper,weuseamethodinordertofindexactexplicittravelingsolutionsinthesubspaceofthephasespaceforCH2equations.Thekeyideaisremovingacoupledrelationforthegivensystemsothatthenewsystemscanbesolved.Theexistenceofsolitarywavesolutionsisobtained.Itisshownthatbifurcationtheoryofdynamicalsystemsprovidesapowerfulmathematicaltoolforsolvingagreatmanynonlinearpartialdifferentialequationsinmathematicalphysics.
简介:RolesofKeap1-Nrf2pathwayinbrain:NeuronalsurvivalandneurogenesisareimpairedinneurodegenerativediseasessuchasParkinson’sdiseaseandAlzheimer’sdisease(Winneretal.,2011).Geneticup-regulationofgrowthfactorsenhancedneuronalsurvivalandneurogenesis,improvedneuronalfunctionsandhalteddiseaseprogressioninanimalmodelsofAlzheimer’sdisease
简介:Gettingpaidtoplayvideogamesmaysoundtoogoodtobetrue.ButNewbee,ateamoffiveprofessionalgamers,hasprovenitispossible.ThisChinese-basede-sportsteamwontheDOTA2worldchampionshipattheinternationaltournamentinSeattle,US,onJuly21,2014,takinghomea$5million(31.2millionyuan)prize.Manyhavebeenstunnedbythehugesum,butonlyfewknowoftheteam’sthornyroadtoglory.
简介:Sr1.995–1.5xGdxSiO4:0.005Eu2+phosphorserieswithx=0–0.08molfornear-ultravioletwhitelight-emittingdiodes(NUVw-LEDs)weresynthesizedviasolid-statereactionmethod.XRDprofilepatternandrefinementresultsdemonstratedthatdopingGd3+ionsresultedinthephasetransformation(β-Sr2SiO4→α’-Sr2SiO4).Thephotoluminescencespectrumofthesamplewithx=0moldisplayedtwoemissionpeakscenteredat470and525nm.Thetwo-peakspectrabecameone-peakspectrawiththeGd3+concentrationincreasing.Actually,thefittingresultsdemonstratedthattheone-peakspectrawerestillcomposedoftwosingleemissionspectra.ThephotoluminescenceintensitywasimprovedandtheCIEchromaticitycoordinateswereadjustedviadopingGd3+.
简介:Thispaperreportsonthelongevityofglycerol-dry(CO2)reformingoverthelanthanum(La)promotedNi/Al2O3catalysts.TheXRDresultsshowedthattheNiparticlewaswell-dispersedinthepresenceofLapromoter.Inaddition,viatheNH3-TPDanalysis,itwasfoundthattheLapromoterhasreducedtheacidityofNicatalystwhichmayhaveexplainedthemitigationofcarbonlaydown.Itwasdeterminedthatthe3.0wt%La-promotedNi/Al2O3catalystpossessedthelargestBETspecificsurfaceareaof97m2g-1.Consequently,ityieldedthebestcatalyticlongevityperformancewithconversionattainedmorethan90%,evenafter72hofreactionduration.Significantly,itcanbeconfirmedthatthepresenceofCO2duringtheglyceroldryreformingwasessentialinreducingcarbondeposition,mostlikelyviagasificationpathway.Thishasensuredastabilityofcatalyticactivityforalongreactionperiod(72h).
简介:为研究鸭梨可溶性固形物(SSC)等内在品质对其组织褐变发生的影响,进而为鸭梨组织褐变采前防控技术提供理论依据,利用K—BA100R型无损水果糖度检测仪,按SSC高低对鸭梨进行分级,贮于0℃环境中,分别采用1%02+10%C02浓度的气体进行诱导褐变处理15d和30d,分析鸭梨果实采后品质与其组织褐变的关系。结果表明,诱导处理30d。鸭梨果皮和果肉褐变指数与SSC分别呈极显著(R=0.999,R=0.992)正相关,与果实单果重呈显著(R:0.965,R=0.959)正相关,与可滴定酸(TA)含量呈显著负相关(R=-0.958,R=-0.966)。随着诱导时间的延长,果实组织褐变程度越重,TA和VC含量下降明显,且鸭梨果皮、果肉和果心组织的细胞膜透性增大。同时,在鸭梨果皮组织中,N、Ca和B元素的含量越高,则果皮无褐变或褐变程度较轻;在果肉和果心组织中,无褐变或褐变相对较轻的果实,其K和B元素含量较高:褐变程度较重的果实.其组织中的Ca含量较低。表明鸭梨果实的TA与VC含量及K、B、Ca等元素含量与其组织褐变关系密切,提高鸭梨果实的内在品质可在一定程度上减少褐变的发生.而SSC含量与高CO2伤害型黑心病的发生程度无明显规律。
简介:Curcumin,adietaryphytochemical,exhibitsmultifunctionalnaturalproductwithregulatoryeffectsoninflammation.However,thepoorbioavailabilitylimitsitsclinicalapplications.Thus,wedesignedandsynthesizedanovelmonocarbonylanalogueofcurcuminB7andtheirinhibitionagainstmonocytechemotacticprotein-1(MCP-1)andinterleukin-8(IL-8)releasewasevaluatedinH2O2-stimulatedhumanvascularendothelialcells(ECs)inadose-responsivemanner,whileexhibitingnocytotoxicityinECs.Takentogether,theseinsightsonthenovelcompoundB7mayserveaspotentialagentsforthetreatmentofatherosclerosis.
简介:目的检测幽门螺杆菌感染(Hp)与HIF-2α、ABCG-2蛋白在胃癌组织中的表达,探讨Hp感染在胃癌发生、发展中的干细胞机制及对化疗抵抗的分子机制。方法采用快速尿素酶试验和免疫组化SP法联合检测60例胃癌组织和45例慢性胃炎组织的Hp感染情况,免疫组化SP法检测胃癌组织中HIF-2α、ABCG-2蛋白的表达情况。结果胃癌组织中Hp的阳性表达率为67.3%(37/55),明显高于慢性胃炎组织的45.2%(19/42),差异有统计学意义(P=0.029)。Hp感染与胃癌的浸润深度和淋巴结转移有关(P〈0.05),而与性别、年龄、组织分化程度及远处转移无关(P〉0.05)。HIF-2α蛋白在Hp阳性胃癌组织与Hp阴性胃癌组织中的阳性表达率分别为81.1%和50.0%,且HIF-2α蛋白表达与Hp感染之间呈正相关(r=0.321,P=0.017)。ABCG-2蛋白在Hp阳性胃癌组织与Hp阴性胃癌组织中的阳性表达率分别为86.5%和55.6%,且ABCG-2蛋白表达与Hp感染之间呈正相关(r=0.342,P=0.011)。在37例Hp阳性胃癌组织中,HIF-2α与ABCG-2表达呈正相关(r=0.604,P〈0.0001)。结论Hp可能通过激活HIF-2α-ABCG-2通路来促进胃癌组织中HIF-2α和ABCG-2的表达,诱导胃癌细胞的干细胞化及化疗抵抗。