学科分类
/ 1
13 个结果
  • 简介:1.WheredidtheOlympicgamescomefrom?Therearemanydifferentstoriesaboutthebe-ginningoftheOlympics.OnemythsaysthattheguardiansoftheinfantgodZeusheldthefirstfootrace,orthatZeushimselfstartedtheGamestocelebratehisvictoryoverhisfa-therCronusforcontroloftheworld.Anothertradi-tionstatesthataftertheGreekheroPelopswonachariotraceagainstKingOenomaustomarryOeno-

  • 标签:
  • 简介:Citricandmalicacidsatconcentrationsof0.1,1.0,10,and100mmol/LwereaddedtothreeUltisolsandoneOxisol,TheamountofPinsolutionincreasedwithincreasingorganicacidconcentrations,whiletheamountofFe-andAl-boundPdecreased.ThisresultsuggestedthatnaturallyoccurringproductsoforganicmatterdecompositioncouldincreasethePavailabilitytoplantsinsoilswherethereisarelativelylargepoolofFe-andAl-boundP.Theinteractionsbetweencitricandmalicacidsattheaboveconcentrations,andpaddedatratesof10,20,40,and80mg/kgweredetermined.Atzerolevelsoforganicacids,alladdedPbecameeitherlabileorbound,andgreaterproportionsremainedsolubleastheconcentrationoforgaicacidsincreased,whichsuggestedthatorganicacidsreducedfixationofdissolvedPinFe-andAL-richsoils.AgriculturalpracticeswhichincreaseorganicmatterinputonP-deficientacidsoildcoulddecreasePdeficiency,Thiswouldbeimportantinmanytropicalandsubtropicalregionswherethesesoilsarecommon,andwherethecostsoffertilizersandlimearerelativelyhigh.

  • 标签: 氧化土 老成土 酸性土壤 天然有机酸 磷代谢 土壤磷
  • 简介:UsingtheSASsoftware,thedataofenvironmentalfactorsvs.redtidebiomasswereanalysedduringtheprocessofSkeletonemacostatumredtidewhichbrokeoutintheChangjiangEstuaryonJune9~15,1990.Theresultsofthemultivariatestatisticalanalysisshowthattheenvironmentalfactorsaresimilarintheirdevelopingandmaintenanceperiodsandthatthevaluesofenvironmentalfactorsbegintoberestoredtonormallevelsduringthedisappearingperiod.Theresultsobtainedfromusingthemethodsofcorrelation,variableclusterandmaincomponentanalysesarebasicallyidentical.Theimportantfactorscontributingtotheoccurrenceofthisredtideareatmosphericalpressure,watertemperature,salinity,pH,No3-,-N,Po43--PandFe,amongwhich,salinity,FeandPO43--Paretheleadingfactorswhichhavetriggeredtheoccurrenceoftheredtideasdeterminedbythestep-by-stepregressionanalysis.Meanwhile,thelineardiscriminationfunctionshavebeenestablishedfortheredtide.TheenvironmentalfactordataofanotheroccurringprocessofSkeletonemacostatumredtideintheChangjiangEstuaryhavebeenchosenforredtidediscriminationwithsatisfactoryresults.

  • 标签: CHANGJIANG Estuary SKELETONEMA costalum red tide
  • 简介:Theactivitiesofgeomagneticstormsaregenerallycontrolledbysolaractivities.Thecurrentsolarcycle(SC)24isfoundtobemild;comparedtoSCs19–23,thestormoccurrenceandsizederivedbyaveragingtheoccurrencenumberandDstaroundthesolarmaximumarereducedbyabout50–82%and36–61%,respectively.Weestimateseparately,forSC19to24,therepeatintervalsbetweengeomagneticstormsofspecificDst,basedonfitsofpower-lawandlog-normaldistributionstothestormdataforeachSC.RepeatintervalsbetweensupergeomagneticstormswithDst≤–250nTarefoundtobe0.36–2.95year(s)forSCs19–23,butabout20yearsbasedonthedataforSC24.Wealsoestimatetherepeatintervalsbetweencoronalmassejections(CMEs)ofspecificspeed(VCME)sinceCMEsareknowntobethemaindriversofintensestormsandtherelatedstatisticsmayprovideinformationaboutthepotentialoccurrenceofsupergeomagneticstormsfromthelocationoftheSun.OuranalysisfindsthataCMEwithVCME≥1860km/smayoccuronceper3and5monthsinSC23and24,respectively.BasedonaVCME-Dstrelationship,suchafastCMEmaycauseastormwithDst=–250nTifarrivingattheEarth.BycomparingtheobservedgeomagneticstormstostormsexpectedtobecausedbyCMEs,wederivetheprobabilityofCMEcausedstorms,whichisdependentonVCME.ForaCMEfasterthan1860km/s,theprobabilityofaCMEcausedstormwithDst≤–250nTisabout1/5forSC23or1/25forSC24.AlloftheaboveresultssuggestthatthelikelihoodoftheoccurrenceofsupergeomagneticstormsissignificantlyreducedinamildSC.

  • 标签: solar cycle super GEOMAGNETIC STORM REPEAT
  • 简介:Objective:Tosearchfortheinterferenceoppoaunityoffatemboliafterfractureoflongboneorpelvis.Methods:86patientswereselectedanddividedintourineketonepositivegroup(UKPgroup)andurineketonenegativegroup(UKNgroup).Theclinicaldata(includingclinicalandsub-clinicalfatembolism)ofallcaseswereanalyzed.Theincidencerateoffatembo-lismandtheserumtriglyceride(TG)levelwerecomparedbetweenthetwogroups.Results:7patientswithketonuriahadfatem-bolism,3ofthemhadprogressivebloodsedimentationandplateletabnormality.TheincidencerateoffatembolismandtheserumTGlevelinUKPgroupwashigherthanthatinUKNgroup.TherewasasignificantdifferencebetweentheUKPgroup(P<0.05)andtheUKNgroup(P<0.01).Conclusion:TheresultssuggestedthatthepatientshaveahigherriskoffatembolismwhentheserumTGlevelishigh,andresultsinketonuria.Sothiscanbeconsideredastheinterferenceopportunityofthefatemboli.

  • 标签: 骨盆骨折 脂肪栓塞综合征 长骨骨折 并发症 发病机制
  • 简介:

  • 标签:
  • 简介:AbstractIntroduction:Scarring and non-scarring alopecias have rarely been described to occur together in the same patient. Distinguishing these two different types of alopecia is important as treatment and prognosis can be different.Case presentation:Here, we report the first case of simultaneous alopecia areata (AA) and central centrifugal cicatricial alopecia (CCCA) in a 35-year-old woman. New alopecic patches were noted on her frontal and vertex scalp. Biopsy of the frontal scalp revealed miniaturized hair follicles and dense lymphocytic infiltrate surrounding the hair bulbs, consistent with AA; while biopsy of the vertex scalp revealed decreased hair follicles, perifollicular fibroplasia with eccentric atrophy of the follicular epithelium, and premature desquamation of the inner root sheath at the level of the lower isthmus, consistent with CCCA.Discussion:Proposed mechanisms of these two alopecia types occurring together include loss of immune privilege, genetic predisposition, as well as unknown external factors that trigger an autoimmune lymphocytic response. Most recently, the peptidylarginine deiminase type III gene has been implicated in both diseases. Although treatment options can overlap between the two diseases, treatment response can differ and CCCA tends to have a worse prognosis.Conclusion:Awareness of this concomitant presentation of two alopecic types is important for appropriate treatment and prognostication.

  • 标签: alopecia areata central centrifugal cicatricial alopecia non-scarring alopecia scarring alopecia peptidylarginine deiminase type III gene
  • 简介:这份报纸涉及差错察觉(FD)为有隧道fadings,随机发生的多重通讯延期,和无穷地分布式的延期的分离时间的随机的系统的一个班的问题。所有三现象有随机发生和互相独立,但是服从Bernoulli分发的随机的变量的三个序列的特征被采用描述他们。这份报纸的目的是设计一个FD过滤器以便FD动力学在吝啬的平方并且,同时是指数地稳定的在剩余信号和差错信号之间的错误被使尽可能小。集中的分析被利用为设计FD过滤器导出足够的条件,它保证指数的稳定性和规定H表演。FD过滤器参数被解决一个凸的优化问题获得。一个解说性的例子被提供表明FD设计计划的有效性。

  • 标签: 复杂系统 分布式 随机 延期 隧道 无穷
  • 简介:MicromorphologicalcharacteristicsoffourpaleosollevelsoftheManonga-WemberedepositsinCentralTanzaniaindicateperiodsofwetterclimateinthePliocenethanatpresent.Thestratigraphyofthestudiedsectionshowsaseriesoflacustrinecalcareousclaysedimentsalternatingwithgravel,sandandsilt.ThesedimentsarebelievedtohavebeendepositedintheManonga-Wemberepaleolakeenvironment.Paleosolsintercalatethesesedimentsandwereformedwhenstablelandscapesdevelopedonformerlakebedsduringregressionperiods.MicromorphologicalfeaturesofthepaleosolsindicatestrongclayilluviationofredtoyellowtypicclaycoatingandsomeFe-Mnhydoxidehypocoatingsinvoidsandchannels.Thegroundmassconsistsofeitheranaccumulationofbioturbatedyellowtoredclaycoatingfragmentsoranargillicredtoyellowgroundmassofclaymass.Suchanilluviationanditsassociatedgroundmassiscomparabletointenseclayilluviationfrontsthatarefoundinpresent-daycalcareoussedimentsofwarmandwetclimates.ThepaleosollevelsthereforerepresentwetterclimaticconditionsthantodayintheareaduringtheLowerPliocene.

  • 标签: 古土壤 中新世 沉积物 坦桑尼亚
  • 简介:自然地发生的产生胸腺的CD4+CD25+规章的T(Treg)房间被认为在自我忍耐起一个中央作用。支持Treg房间的开发的精确信号留下逃犯,却可观证据建议T房间在胸腺在遇到抗原的costimulatory分子,cytokines,TCR的性质和壁龛或上下文起重要作用。从Treg房间的TCR的分析证明了这张人口的一个大比例从CD4+CD25-房间与TCR比较有更高的热望到自我抗原,那外部抗原为他们的发展,维护,或扩大被要求。Treg房间被显示了在圆周经历扩大,多半由自我抗原的存在调整了。许多研究证明了在忍耐正式就职的Treg房间的参与是抗原特定的,与甚至错配MHC在移植/接枝对主人疾病(GVHD),autoimmunity,癌症,和怀孕。论文研究在身体正直的维护为自我反应的Treg房间结束了一个重要角色。基于那些研究,我们假设自我反应的Treg细胞在所有健康个人之中被分享并且认出一样的自我抗原和他们的TCR,这为定义健康自我的每个器官的很少主导的抗原编码。这些主导的自我抗原能被认为是“通用有免疫力的代码”。

  • 标签: 自身免疫 T细胞 怀孕 控制免疫
  • 简介:EarthquakesofM_S5.6andM_S6.1occurredinYingjiang,YunnanonMay24andMay30,2014respectively.Inthispaper,weusethewaveformdatarecordedbymobileseismicstations(KAC)whichweresetupinthesourceareaaftertheYingjiangMS5.6earthquakeonMay24,2014tostudytheshear-wavesplittingcharacteristicsofYingjiangM_S6.1earthquakesequencewiththeSAMmethod.Theresultshowsthatpredominantpolarizationoffastshear-wavesbeforetheM_S6.1earthquakeisconsistentwiththedirectionofregionalprincipalcompressivestress,andpredominantpolarizationoffastshear-wavesbeforetheM_S6.1earthquakeshowbetterconsistencyandsmallerdispersioncomparedtoaftertheM_S6.1earthquake,andtheremaybeadeflectionforthefastshearwavespredominantpolarizationbetweentheM_S6.1earthquakesequenceandforeshocksequence.Wefoundthatthetime-delaysgenerallyexhibitedalowerlevelbeforetheM_S6.1earthquakeandarelativelyhighervalueaftertheM_S6.1earthquake.

  • 标签: 剪切波分裂 地震序列 波形数据 应力方向 前震序列 延迟时间
  • 简介:尽管有CD4+CD25+规章的T房间(Tregs)在过去的十年期间,在他们的临床的翻译以后的进步仍然保持停滞。增长证据建议那自然地发生的CD8+CD122+T房间也是有能力的Tregs禁止T房间回答并且象alloimmunity一样压制autoimmunity。事实上,他们是像记忆的Tregs类似于一个中央记忆T房间(T厘米)显型。位于他们的抑制下面的机制仍然不好被理解,尽管他们可以包括IL-10生产。我们最近证明了那个规划death-1(PD-1)表达式区分在之间规章并且存储器CD8+CD122+T房间和那CD8+CD122+Tregs经历更快的homeostatic增长并且比常规CD4+CD25+Tregs。这些调查结果可以为在诊所加速有效Treg治疗打开调查的一根新线。在这评论,我们在CD8+CD122+Treg在诊所研究并且讨论他们的显型,在autoimmunity和alloimmunity的镇压角色,功能的要求,行动的机制和潜在的应用。

  • 标签: 调节性T细胞 CD8 记忆性 T细胞亚群 天然 家庭
  • 简介:在地球旋转和1975Haicheng,辽宁Ms7.3地震,2008Wenchuan,四川Ms8.0地震和2004苏门答腊Msg之间的关系。在他们以前发生在震中区域附近的0地震,以及中等小的地震在这研究被调查。获得的结果能有益于在地球旋转和地震之间的关系的进一步的理解。

  • 标签: 周围地区 地震前 自转 地球 强震 小震