简介:Sulfurtransformationin3soilsmaintainedinaclosedincubationsystemanditsavailabilitytoplantswereinvestigatedusingcarrier-free^35S-SO4^2-and^35S-labeledryegrassstraw.Forcarrier-freeNa2^35SO4treatment,78%,70%and64%of^35SappliedwerefoundinCa(H2PO4)2-extractaleSfraction,4%,5%and7%inslowlysolubleinorganicS,11%,15%and18%inC-O-S,5%,7%,and6%inC-bondedS,and5%,7%and6%inunidentifiedorganicS120daysafterincubationinblacksoil,cinnamonsoilandchestnutsoil,respectively.Mostof35Suptakebyplantscamefromextractable35SO4^2-,andlittlefromC-O-^35SandC-bonded^35S,Inthetreatmentwith35S-labeledstraw,51%,46%and36%of35SincorporatedwerefoundinCa(H2PO4)2-extractableSfraction,7%,6%and7%inslowlysolubleinorganicS,13%,15%and18%inC-O-S,8%,8%and6%inC-bondedS,and18%,25%and35%inunidentifiedorganicSattheendofincubationinabove-mentonedthreesoils,respectively.HigheravailabilityofC-O-35S,C-bonded35Sandunidentifiedorganic35Sfrom35S-labeledstrawwasobservedin35S-labeledstrawtreatmentcomparedtocarrier-freeNa2^35SO4treatment.
简介:PrecipitationstudywascarriedoutinNi-35at.pctCralloybymeasuringelectricalresistivityatdifferentageingtemperaturesandlongageingtimes.Duringageing,itwasobservedthatelectricalresistivityinitiallyrosewithageingtimeandthenfellafterverylongageingataconstanttemperature.TheinitialincreaseinresistivityduringageingmaybeattributedtotheformationofGPzones/Cr-richprecipitatesatearlystagesbynucleationprocessanddecreaseinresistivity,andafterattainingamaximum,isduetothegrowthofprecipitateparticlesandsubsequentlybycoarseningoftheseprecipitates.TheresultsofelectricalresistivitymeasurementsduringageingwereconfirmedbyX-raydiffractionanalysisindicatingtheformationofaCr-richphaseandaCr3Ni2phaseintheNimatrix.
简介:目的总结我院1968~2007年收治的35例支气管腺样囊性癌的临床特点,旨在提高对本病的认识。方法对35例支气管腺样囊性癌的临床特点进行分析。结果临床表现:该病发病率男女均等。首发症状以咳嗽、咳痰、咳血、气促气短等较大中心气道占位而引起的阻塞症状为主要表现。诊断:胸部X线、CT常显示中央性肿块,可伴支气管内肿物,但确诊要通过纤维支气管镜、手术病理证实。治疗和预后:手术为最佳的治疗方式,对于手术切缘有癌残留的患者应予术后辅助放疗;单纯放疗亦有效,但不易治愈;单纯化疗效果不佳。该病低度恶性,一般发展较慢,病程长,3年、5年、10年生存率分别为84.6%,66.7%,46.2%。结论支气管腺样囊性癌起源于支气管粘膜下的浆液及粘液腺,具有低度恶性,发展缓慢,罕见。目前认为手术切除是最佳治疗方法。
简介:摘要目的探讨胸腔积液的病因和诊断。方法回顾分析35例胸腔积液住院患者的临床资料。结果本组病因前5位依次为结核性占54.29%,恶性占31.42%,外伤性占5.71%,肺炎和脓胸占5.71%,心功能不全占2.85%。结核性中以≤40岁患者为主,占57.89%,恶性胸液中以≥60岁患者居多,占54.54%,两种病因积液中中年患者均趋增长,尤其是恶性胸液占同类患者的33.33%,占同龄患者的31.17%。此外,本组患者血清及胸液癌胚抗原(CEA)水平,恶性组较良性组均显著增高(P<0.01);胸液CEA与血清CEA比值,恶性组较良性组也明显增高(P<0.05)。结论胸腔积液主要病因是结核和肿瘤,但结核性患者中老年人增多,恶性患者发病年龄向中年推移。胸液CEA含量及其与血清CEA比值的增高对鉴别良恶性胸液有重要的价值。