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13 个结果
  • 简介:Thenonchromatinproteinousresidueofthecellnucleuswasrevealedinourlaboratoryasearlyasin1948andthenidentifiedbylightandelectronmicroscopyasresidualnucleoli,intranuclearnetworkandnuclearenvelopebefore1960,Thisstructuretermedafterwardsas'nuclearresidue','nuclearskeleton','nuclearcage','nuclearcarcass'etc.,wasmuchlater(in1974)isolated,studiedandentitledas'nuclearmatrix'byBerezneyandCoffey,towhomthediscoveryofthisresidualstructureisoftenwronlyascribed.Therealhistoryofnuclearmatrixmanifestationisreportedinthispaper.

  • 标签: 核碎片 细胞核 核基质 分部分离 历史
  • 简介:Cultureisbroadlyviewedasallthehumanactivitiesthatdefineusasaspecies.″Sturgeon'sLaw″(that90%ofeverythingisinferior)isintroducedtodefendthestudyoffiction,andsciencefictioninparticular,inhighereducationasawayofunderstandingourselvesbetter,andperhapsimprovingtheworldthroughtheincreasedunderstandingoftomorrow'sleaders.Severalwaysofreadingparticularworksofsciencefictionareexamined,likeprovidinghistoricalcontextsforreaders,closereadingandstructuralanalysis,andapplicationoftheoriesbasedonparticularideologiesorfromotherdisciplinesinthesocialandpoliticalsciences(suchasfeministtheory,Marxisttheory,psychologicaltheory,etc.).Aconclusionisdrawnthatforliteraryanalysis,ahybridmethodology,onedevisedindividuallyforeachtext,worksbest.

  • 标签: 科学小说 美国 文学研究 文化背景
  • 简介:Multiplemyeloma(MM)isamalignancyoftheplasmacellcharacterizedbymigrationandlocalizationtothebonemarrowwherecellsthendisseminateandfacilitatetheformationofbonelesions.Itisassociatedwithaconstellationofdiseasemanifestations,apartfromosteolyticlesions,anemiaandimmuno-suppressionduetolossofnormalhematopoieticstemcellfunction,andcardiacamyloidosisduetomonoclonalimmunoglobulinsecretionaswell[1].Amyloidinfiltrationoftheheartmayfrequentlymasqueradeashypertrophiccardiomyopathy(HCM).HCM,ofwhichunderlyingcauseandpathogenesisarelargelyunknown,ischaracterizedbyleftand/orrightventricularhypertrophy,withpredominantinvolvementoftheinterventricularseptumintheabsenceofothercausesofhypertrophy,suchashypertensionorvalvularheartdiseases[2].Whileexcessivehypertrophyofthemyocardiumismostcommonlyassociatedwithmyocytehypertrophy,infiltrationwithamyloidalwaysneedstobeconsidered.Inthisreportwepresentedtwocasesofmultiplemyelomathatmimickedhypertrophiccardiomyopathysocloselythatitrequiredbonemarroworendomyocardialbiopsytoestablishthediagnosis.

  • 标签: 心脏疾病 心肌病 多骨髓瘤 血浆细胞
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  • 简介:一个语音的实验被进行调查讲话焦点的声学的特征是否受到讲话层次的影响。六个说话者被指示朗读32组试验性的材料。在不同讲话层次的foci的持续时间,沥青范围,f0最大值,和f0最小为统计分析被提取。结果表明在讲话层次更高嵌入的foci把相对更长的持续时间和更多搭范围扩展;而且与音调联合的变化,在不同讲话层次的foci在他们f0最大值和f0最小特征的表明显著地不同。明确地说,为非低的音调联合,,在更高的讲话层次的foci为低音调的联合与更高的f0最大值被读,在更高的讲话层次的foci与更低的f0最小被明白表示。

  • 标签: 声学特性 话语 中国标准 实验材料 提取时间 层次结构
  • 简介:Thefeaturesofanattosecondextremeultraviolet(XUV)fieldareencodedintheattosecondXUVspectrogram.WeinvestigatetheeffectofthetemporalstructuresofattosecondXUVfieldsontheattosecondstreakingspectrogram.FactorssuchasthenumberofattosecondXUVpulsesandthetemporalchirpofattosecondXUVpulsesareconsidered.ResultsindicatethatunliketheattosecondstreakingspectrogramforanattosecondXUVfieldwithtwopulsesofahalf-cycleseparationofstreakingfield,thespectrogramfortheattosecondXUVfieldwiththreepulsesdemonstratesfinespectralfringesinseparatedtraces.

  • 标签: 时空结构 阿秒 频谱 XUV光谱 超紫外线 脉冲
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  • 简介:目的:探讨70岁以上老年人脑卒中患者的心电图、CT和临床表现的特点及其预防和治疗方法。方法:100例患者的心电图、CT和临床表现被分析了。结果:这些患者的心电图和CT改变以及临床表现是各不相同的。结论:70岁以上老年人的脑卒中患者是具有一定特点的。

  • 标签: 70岁以上老年患者 心电图 CT 临床表现 脑卒中
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  • 简介:AbstractIntroduction:Celiac disease typically presents with symptoms of malabsorption, but extraintestinal manifestations are increasingly reported. Aplastic anemia as the mode of celiac disease presentation is extremely rare in children.Case presentation:We report a 2-year-old boy who presented with loose stools, loss of appetite, and bicytopenia with severe aregenerative normocytic anemia. Investigations, including bone marrow aspirate and biopsy, revealed aplastic anemia. Screening for malabsorption showed increased plasma concentrations of anti-transglutaminase and anti-gliadin antibodies. A duodenal biopsy confirmed the histologic features of celiac disease. The child received a packed red cell transfusion and was started on a gluten-free diet, with a very good prognosis and normalization of both his blood and histological parameters. To the best of our knowledge, our report is the sixth pediatric case in the literature.Conclusion:Screening for celiac disease should be performed in children with unexplained hematological abnormalities such as aplastic anemia with or without gastrointestinal symptoms.

  • 标签: Aplastic anemia Celiac disease Child Gluten-free diet