简介:Theobservationandestimationofdirectionalspectraofseawavesisoneoftheessentialsubjectsofstudyofoceanicdynamics.Onthebasisoftheirregularlinearwavetheory,estimationmethodsfori/UV,PUVandVVdirectionalwavespectraarederived.ByusingijandPUVdatameasuredin-situ,directionalwavespectraareestimated,meanwhilethevirtuesanddefectsofvariousspectraarecomparied.Thismethodprovideabasisfortheobservationsofseawaves.
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简介:水稻作为世界上最重要的粮食作物之一,与其它谷类作物有重要的同线性关系,是禾谷类植物的模式植物.国际水稻基因组测试项目(IRGSP)最近报道了覆盖率为95%、由389Mb组成的水稻基因组序列,实际上包括所有的常染色质和两个完整的着丝粒.总共37544个非转座的与蛋白质编码有关的基因已被鉴定,水稻基因组的绝大部分一般可通过DNA斑点杂交和电子杂交进行锚定,基因组测序数据也可整合到水稻的物理图谱中,物理图谱和遗传图谱的比较能够再现完整的水稻基因组的物理距离和遗传距离之间的关系.经常发现有细胞器基因转移到核内染色体上,水稻高分辨率的物理图谱的整合将很大地促进整个基因组的测序.今后物理图谱将有助于一些重要农艺性状的基因进行图位克隆,将作为禾本科植物基因组比较分析的一个重要工具.
简介:Anovelfluorescencelifetimeimagingmicroscopy(FLIM)workingwithdeepUV240–280nmwavelengthexcitationshasbeendeveloped.UV-FLIMisusedformeasurementofdefect-relatedfluorescenceanditschangesuponannealingfromfemtosecondlaser-inducedmodificationsinfusedsilica.ThisFLIMtechniquecanbeusedwithmicrofluidicandbiosamplestocharacterizetemporalcharacteristicsoffluorescenceuponUVexcitation,acapabilityeasilyaddedtoastandardmicroscope-basedFLIM.UV-FLIMwastestedtoshowannealingofthedefectsinducedbysilicastructuringwithultrashortlaserpulses.Frequency-domainfluorescencemeasurementswereconvertedintothetimedomaintoextractlongfluorescencelifetimesfromdefectsinsilica.
简介:UVwavelengthauto-tunedoutputsystemisrealizedbythedifferencemethod.Controlledbythemicroprocessor,outputwavelengthauto-trackingisachieved.Besides,equipmentself-checkingauto-positioningandtemperaturecorrectarerealized.Thewavelengthtunedoutputefficiencyintheexperimentisbetterthan97%.
简介:FurfuralinaqueoussolutionwastreatedbyUV/O3method.Theresultsshowthattheremovalrateoffurfuralisseverelyenhancedandthesynergismphenomenonappearswhenultravioletandozonearepresenttogether.TheinfluencesofexperimentalparameterssuchaspH,theintensityoflightandthenegative-positiveionsonfurfuraldegradationwereinvestigated.Theresultsindicatethatfurfural(300mg/L)isalmostcompletelydegradedafter3hundertheoptimumconditions.TheintermediateinthefurfuraldegradationwascharacterizedbyGC-MSandIRspectrumandthedegradationmechanismoffurfuralbyUV/O3technologywasproposed.