简介:摘要目的全面了解全自动CA-550血凝仪的性能及装机相应条件,以评价该机的实用性。方法一、确认SysmexCA-550血凝仪安装的实验室条件工作场地、工作环境、工作电源;二、实验方法选泽凝血酶原时间(PT)、凝血酶原时间(TT))、活化部分凝血酶时间(APTT)、纤维蛋白原时间(FIB)四项指标,对仪器的凝固法检测重复性精密度试验、准确性试验、批内不精密度试验、线性试验及携带污率试验进行评价。结果准确性试验PT、TT、APTT、FIB其均值分别在相应要求范围内;批内不精密度试验PT、TT、APTT、FIB的CV为1.41%、2.40%、0.63%、3.30%,小于国家卫生行业判定标准;线性试验FIB的相关系数为r=0.9996;携带污染率试验FIB其携带污染率为0.31%.结论SysmexCA-550血凝仪按仪器装机条件装机,按卫生行业标准试验,其性能良好,测试速度较快,项目可批量试验,适合于中小型实验室常规使用。
简介:摘要肿瘤标志物常用于筛查、诊断和鉴别恶性疾病,癌抗原CA125被认为是妇科肿瘤最重要和可靠的血清学诊断指标。但近年来研究表明,CA125在除卵巢癌等恶性肿瘤升高外,许多良性疾病也有明显升高,特别是在慢性肝病中的报道较多。研究表明,CA125在肝硬化患者中明显升高,并随肝硬化程度加重而进行性增加,病因考虑与腹水-血清交换、肝脏代谢降低及雌激素灭活障碍等机制有关。因此,有学者认为CA125可以作为反应肝硬化程度及监测腹水情况的一项敏感指标,对肝硬化腹水早期诊断及估计预后具有重要的指导意义。本文综述了近年来关于CA125与慢性肝病患者的研究进展。
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简介:摘要目的因科室SysmexCA7000全自动凝血仪发生故障,进行了维修和主要部件的更换,现对其进行性能验证。方法对CA7000进行性能评价,包括精密度、准确度、最小检测限、可报告范围、携带污染率、生物区间等指标。结果批内最大CV值1%;批间最大CV4.71%;准确度最大偏倚为7.3%;FIB最小检测限为0.8g/L,;FIB临床可报告范围为0.8~45.5g/;携带污染率结果均低于判定标注10.0%;参考区间的验证试验,计算R值为97.5%,验证均通过。结论维修后的CA7000全自动凝血仪是一部具有良好精密度、准确度、检测范围宽及携带污染率低的检测系统。
简介:摘要床身是车床精度要求很高的带有导轨(山形导轨和平导轨)的一个大型基础部件,用于支撑和连接车床的各个部件,并保证各部件在工作时有准确的相对位置。床身是车床的基础部件,用于连接其他部件,主要拥有减振、抗振、抗压的作用。是车床工作时支撑整体的主要部分。
简介:AbstractObjective:Serum tumor markers are seldom considered as diagnostic biomarkers for breast cancer because they lack good sensitivity or specificity. This study aimed to evaluate whether a combination of circulating tumor cells (CTCs) and the serum tumor markers carcinoembryonic antigen (CEA), cancer antigen (CA)125, and CA15-3 might improve their diagnostic performance.Methods:We performed a retrospective case-control study of patients with breast cancer or benign breast diseases (BBD) and healthy female donors (HDs) who underwent preoperative CTC detection and serum tumor marker tests between December 2017 and November 2018. CTC detection and serum tumor marker test results were collected from 177 breast cancer patients, 64 patients with BBD, and 20 HDs. Correlations between CTC, CEA, CA125, or CA15-3 and participants’ clinical characteristics were then analyzed. The diagnostic performances of CTC, CEA, CA125, and CA15-3 were estimated using the area under the receiver operating characteristic curve (AUC). This study was approved by the Institutional Review Board of Sun Yat-sen Memorial Hospital of Sun Yat-sen University, China (approval No. [2018] kuaishendi(75)) on May 24, 2018.Results:CTC, CEA, and CA15-3 were able to distinguish breast cancer patients from controls (BBD+HDs) (P<0.0001, P=0.0006, and P=0.0086, respectively). CTCs were associated with tumor size (P=0.0275) and lymph node involvement (P=0.0373), while CA15-3 was correlated with cancer stage (P=0.01) and lymph node involvement (P=0.001). The AUCs of CTCs, CEA, CA125, and CA15-3 were 0.845, 0.623, 0.477, and 0.58, respectively. CA125, with AUC<0.5, was not considered a biomarker for breast cancer. CEA and CA15-3 had low sensitivities (<10%) but high specificities (>98%). Combination with CTC improved the diagnostic performances of CEA and CA15-3 for breast cancer. CTC_CA15-3 had better diagnostic performance than CTC_CEA, with an AUC of 0.874, a sensitivity of 0.757, and a specificity of 0.905.Conclusion:CTCs, CEA, and CA15-3 are potential diagnostic biomarkers for breast cancer. The diagnostic performance of CEA and CA15-3 may be improved by combination with CTCs.
简介:NominalcompositionofCa1-xZnxTiO3:0.002Pr3+(x=0.000~0.200)phosphorswerepreparedbyconventionalsolidreactionroute.XRDandPLmeasurementswereusedtoinvestigatethesolid-solutionstructureandluminescencepropertiesofZn-dopedCa1-xZnxTiO3:0.002Pr3+phosphors.Theeffectofsolid-solutionstructureformedbysubstitutionbetweenCa2+andZn2+ionsontheluminescentpropertieswasanalyzed.Theresultsrevealthat,withtheincreaseofZnsubstitutioncontentbelow0.010,latticeparametersandtheintensityofexcitationpeakatboth260and330nmaswellasthecorresponding610nmemissionintensityaremonotonouslydecreasedquicklyinasimilartendency.Also,theevolutionofluminescenceintensityandcrystalcellparametersagainstZndopingconcentrationareingoodagreement.AboveresultsarecloselyrelatedwiththestructurechangewithinCa1-xZnxTiO3:0.002Pr3+solid-solutionphaseformedbytheZnionssubstitutionfortheCasites.Presentstudyrevealsthatthesolid-solutionstructureformedbysubstitutionbetweenCa2+andZn2+ionshassignificanteffectontheluminescencepropertiesofsinglephaseCa1-xZnxTiO3:0.002Pr3+phosphors.
简介:摘要目的建立CUMS大鼠抑郁模型,研究尼美舒利对慢性应激大鼠海马CA1区和CA3区5-HT1A的影响。方法采用慢性不可预见性温和应激建立大鼠抑郁模型,尼美舒利(3、6和12mg·kg-1)和氟西汀(3mg·kg-1)在造模完成后灌胃给药,每天一次,连续21d。结果与正常组相比,模型组大鼠水平运动和垂直运动降低(P<0.01),静止不动的时间较正常组增加(P<0.01)。模型组大鼠进入高架十字迷宫进入总次数和开臂次数及停留时间百分率均较正常组减少(P<0.01),模型组大鼠海马神经元细胞丢失和核固缩明显增多,海马CA1区、CA3区5-HT1A表达强度低,阳性颗粒数目少且着色浅淡。