简介:ThedifferentiationprocessincludingsomaticembryogenesisindifferentGinkgoexplantsinvitroculturewerestudiedbycytologicalobservation.Theresultsareasfollows:1)twocompletecotyledonsandaembryobudwereobservedinmatureembryosandseveralsecretoryacavitivesappearedinmaturationregionofembryobuds,hypocotyls,cotyledonsandradiclesafterculturing20days;twoincompletecotyledonsandaembryobudprimordiawerefoundinlargecotyledonembryos.Theproembryooftwocells,fourcells,multi-cellular,andglobularembroyweredevelopedfromthecallusofthesmallcotyledonembryos.2)Thedifferentiationofcotyledonexplantsstartedfromepidermalcells,andgraduallyformedmeristematiccellmassinthecorticalcells,andeventuallyadventitiousbudswereobserved.3)TheadventitiousrootsofGinkgooriginatedinthecellsatthecrossofvascularcambiumandvascularrays.4)Thetypeofrootingbelongstoinductiontypebyrootprimordium.Theformedadventitiousrootswereobservedafter20days.
简介:Basedondatacollectedfromatemporalseismicnetwork,andinadditiontothedatafromsomenearbypermanentstations,weinvestigatethevelocitystructureandseismicityintheRongchanggasfield,wheresignificantinjection-inducedseismicityhasbeenidentified.First,weusereceiverfunctionsfromdistantearthquakestoinvertdetailed1-Dvelocitystructuresbeneathtypicalstations.Then,weusethedouble-differencehypocenterlocationmethodtore-locateearthquakesofthe2010ML5.1earthquakesequencethatoccurredintheregion.There-locatedhypocentersshowthatthe2010ML5.1earthquakesequencewasdistributedinasmallareasurroundingmajorinjectionwellsandclusteredmostlyalongpre-existingfaults.Majorearthquakesshowafocaldepthlessthan5kmwithadominantdepthof~2km,adepthofmajorreservoirsandinjectionwells.Wethusconcludethatthe2010ML5.1earthquakesequencemighthavebeeninducedbythedeepwellinjectionofunwantedwateratadepth~3kmintheRongchanggasfield.
简介:摘要目的总结国产GK系列人工心脏瓣膜的临床应用经验,评价国产瓣膜的质量和性能。方法2000年5月至2011年4月164例瓣膜替换术病人应用国产GK系列人工心脏瓣膜,男51例,女113例,男女之比为12.215,平均年龄41.2岁(12-58岁),平均体重52kg(35-70kg)。术式MVR125例,DVR33例,TVR+MVR2例,TVR1例,AVR3例;本组病例共用人工心脏瓣膜199枚,选用国产GK系列瓣膜174枚,在33例DVR中主动脉瓣选用其他进口品牌瓣膜25枚。结果早期死亡3例,死亡率1.829%,术后早期出血二次开胸止血2例,术后纵隔感染1例,华法林高敏致出血并发症2例,术后并发瓣周漏1例。结论通过对164例使用国产GK系列人工心脏瓣膜的手术病人进行观察分析,其早期死亡率仅1.829%,无其他瓣膜相关并发症,表明国产GK系列心脏瓣膜质量完全达到了临床应用要求,性能稳定可靠,具有很高的性价比。