首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 187 毫秒
1.
目的:探讨储藏物螨虫标本制作方法。方法:分别用70%乙醇和MA80液对储藏物螨虫保存,并对保存的螨虫进行玻片标本的制作,显微镜下观察螨虫在保存液和玻片标本中的形态。结果:浸在70%乙醇中螨虫,很快就沉入液底;浸在MA80液中螨虫大多浮在液体表面。螨虫8h,16h和24h在70%乙醇和MA80液形态改变数分别为0和0,45只(4.5%)和31只(3.1%),533只(53.3%)和54只(5.4%)。两者相比,16h前螨虫形态改变数差异无显著性(△χ=2.68,P〉0.05);16h到24h,70%乙醇中螨虫形态改变数量明显增加(△χ=553.25,P〈0.01)。24h内两种保存液螨虫形态改变数量差异有显著性(χ=548.38,P〈0.01)。用MA80液中螨虫制作的玻片标本的质量明显好于70%乙醇中保存的螨虫(χ=35.16,P〈0.01)。结论:两种标本制作方法各有优缺点,应根据情况,适当地选择保存液对储藏物螨虫进行保存。  相似文献   

2.
目的观察用不同浓度的乙醇一次性灌胃-1h后大鼠下丘脑、纹状体以及海马内内源性阿片肽即:β-内啡肽(β-endorphine,β-EP),甲硫脑啡肽(met—enkephalin,MENK)、亮脑啡肽(leu—enkephalin,LENK)和强啡肽A(dynorphin A,Dyn A)含量的变化,并记录大鼠血中乙醇浓度及其痛阂的改变,以探讨乙醇的中枢作用机制与内源性阿片肽的关系。方法成年Wistar大鼠随机分为对照组、低浓度组和高浓度组,低浓度组和高浓度组分别用25.6%(v/v)和51.3%(v/v)的乙醇溶液按10ml/kg一次性灌胃,对照组给予等量生理盐水。结果急性摄入乙醇后,低浓度组和高浓度组大鼠痛阂值均升高(P〈0.05或P〈0.01)。与对照组相比,低浓度组大鼠β-EP和MENK的含量在下丘脑内明显增高(P〈0.01或P〈0.05).高浓度组大鼠β-EP,MENK,LENK在下丘脑、纹状体和海马内含量均显著增高(P〈0.01),DynA含量无明显变化(P〉0.05)。结论急性摄入乙醇可引起脑内源性阿片肽含量的增加,这可能是导致乙醇急性灌胃后大鼠痛阈值升高的原因之一。  相似文献   

3.
目的:探讨急慢性乙醇中毒对大鼠心脏的影响机制.方法:雄性健康SD大鼠,随机分为急性和慢性对照组、急性和慢性乙醇中毒组,每组8只.酶法和比色法检测血清和心肌组织谷草转氨酶(AST)、肌酸磷酸激酶(CPK)、超氧化物歧化酶(SOD)、丙二醛(MDA)、Ca^2+-Mg^2+-ATPase和Na^2+-K^+-ATPase的含量,观察心肌微细结构的改变.结果:与对照组相比:急、慢性乙醇中毒+组心肌MDA、AST、CPK和血清AST、CPK含量升高(P〈0.05,P〈0.01),SOD含量减少(P〈0.05,P〈0.01),Na^2+-K^+-ATPase和Ca^2+-Mg^+-ATPase活性降低(P〈0.05,P〈0.01).心肌组织HE染色显示,乙醇中毒组大鼠心肌细胞肿胀、细胞界限模糊不清,慢性组尤为明显.结论:急慢性乙醇中毒通过对大鼠心肌酶和氧自由基的影响而对心脏产生抑制作用.  相似文献   

4.
目的 观察急性乙醇中毒对大鼠海马、小脑氨基酸类神经递质及行为学改变的影响,以探讨急性乙醇中毒对中枢神经系统损害的机制。方法雄性Wistar大鼠48只,随机分为对照组,饮酒后0.5h组,饮酒后1.0h组,饮酒后1.5h组,饮酒后2.0h组,饮酒后4.0h组;实验组60%(v/v)白酒1次灌胃(灌胃体积10ml/kg),对照组用等量生理盐水灌胃。采用高效液相色谱法和Moms水迷宫法分别检测大鼠小脑和海马中谷氨酸(glutamic acid,Glu)和γ-氨基丁酸(gamma aminobutyric acid,GABA)含量的变化以及逃逸潜伏期(escape latency,EL)的变化。结果实验组大鼠小脑和海马中Glu和GABA含量明显下降(P〈0.01),小脑中Glu和GABA比值在0.5h和2,0h组明显升高(P〈0.01).实验组大鼠在饮酒后逃逸潜伏期(EL)值明显延长(P〈0.01),2.0h组和4.0h组的EL值较其他实验组明显缩短(P〈0.01)。结论急性乙醇中毒引起行为学改变可能与小脑和海马氨基酸类神经递质改变有关。  相似文献   

5.
目的观察不同浓度乙醇按不同灌流顺序对离体蟾蜍心脏活动的影响,探讨其作用机制。方法蟾蜍24只,雌雄不限,随机分为正常对照组、乙醇浓度递增灌流组、乙醇浓度递减灌流组,每组8只。结果与正常对照组相比:两种灌流顺序的乙醇组都显示心率减慢(P〈0.01或P〈0.05),心肌收缩幅度减小(P〈0.01),心肌ATP酶和超氧化物歧化酶(SOD)含量减少(P〈0.01),丙二醛(MDA)含量增多(p〈0.01);递增组与递减组相比,无显著差异。结论急性乙醇中毒可导致离体蟾蜍心肌酶发生改变,对心率和心肌收缩幅度有抑制作用,且抑制作用呈浓度依赖性.  相似文献   

6.
文章采用Young网络成瘾量表和社会认同量表对600名中学生进行了问卷调查及分析,以探讨中学生网络使用情况与社会认同之间的关系。发现:中学生的网络成瘾率为27.65%,在性别、年级和生源地维度上均有显著性差异;中学生的社会认同在性别、年级、生源地维度上均存在显著差异(t=-1.225,P〈0.05;t=-2.057,P〈0.01;t=1.513,P〈0.01;);网络使用状况与社会认同之间呈负相关(r=-0.217,P〈0.01),不同网络使用情况的中学生其社会认同水平存在显著性差异(F=47.250.P〈0.01)。结论为中学生的网络使用情况直接影响其社会认同水平。  相似文献   

7.
目的:了解道教学员的人格特征,及其生活满意度状况,通过对比为现代人生活提供借鉴.方法:采用16PF人格问卷和生活满意度量表(SWLS)对湖北武当山道教学院33名学员进行调查.结果:道教学员在16PF的9个维度均与大学生样本存在显著差异,具体表现为B(t=3.92 p〈0.00)、C(t=2.76 p〈0.01)、F(t=-3.19 p〈0.00)、G(t=2.67 p〈0.05)、H(t=2.80 p〈0.00)、L(t=-3.86 p〈0.00)、Q1(t=-4.58 p〈0.00)、Q2(t=-2.91 p〈0.00)、Q3(t=4.07 p〈0.00);同时道教学员的生活满意度得分显著高于大学生样本(t=2.95,P〈0.01);道教学员的积极情感显著高于大学生群体(t=3.55,P〈0.01),其消极情感与大学生群体无显著差异.结论:道教学员人格特征在多个维度与一般大学生存在显著差异,他们生活满意度水平和积极情绪均显著高于后者。  相似文献   

8.
目的:探讨心理控制源与缺陷感对大学生孤独感的影响,并分析缺陷感在心理控制源与孤独感之间的中介作用。方法:采用UCLA孤独量表、缺陷感量表和IPC量表对427名大学生进行问卷调查。结果:一是孤独感总分显著高于常模(t=9.86,P〈0.01);缺陷感总分显著高于前人研究结果(t=10.33,P〈0.01);内控性显著低于常模(t=-18.40,P〈0.01),机遇显著高于常模(t=4.09,P〈0.01)。二是对于男大学生,自尊、社交自信和体能能反方向显著预测孤独感(β=-0.29、-0.29和-0.23,P〈0.05);对于女大学生,自尊、社交自信能反方向显著预测孤独感(β=-0.29和-0.38.P〈0.01)。三是缺陷感在内控性预测孤独感中,起部分中介作用,中介效应占总效应的比率为47%;而缺陷感在两种外控源(机遇、势力他人)预测孤独感中起完全中介效应。结论:心理控制源和缺陷感对孤独感都有显著预测作用,缺陷感在心理控制源预测孤独感之间起中介作用。  相似文献   

9.
探究了人体胎盘组织AC133+造血干/祖细胞(HSPC)的集落形成能力.选用新鲜的人胎盘组织制成单个细胞(有核细胞)悬液,经流式细胞术(FCM)分析其AC133+造血干/祖细胞的纯度,采用免疫磁性分选法(MACS)分选AC133+和AC133HSPC,分别进行粒-单集落形成单位(CFU-GM)、红系集落形成单位(CFU-E)、混合集落形成单位(CFU-Mix)培养,以评价其增殖分化能力.结果显示胎盘组织AC133+细胞百分率为4.11%,其细胞亚群集落培养形成CFU-GM的集落数为(37±3)/1×103;形成CFU-Mix的集落数为(34±5)/1×103;形成CFU-E集落数为(33±4)/1×103.胎盘AC133细胞未见集落形成.结论:人胎盘组织含HSPC,AC133+细胞具有分化为CFU-GM、CFU-Mix、CFU-E的能力;AC133膜抗原可作为胎盘HSPC的分选标志.  相似文献   

10.
无细胞百白破疫苗免疫安全性研究   总被引:1,自引:0,他引:1  
了解无细胞百白破三联疫苗(APDT)用于儿童免疫的安全性。方法:2002~2005年在新乡市红旗区预防接种门诊将3200名3个月至2岁儿童分成2组,其中1600名接种APDT,1600名接种全细胞百白破三联疫苗(WPDT),观察局部与全身反应。结果:接种APDT和WPDT者,基础免疫全身反应发生率分别为0.79%、7.90%,局部反应发生率分别为0.90%、7.83%;加强免疫全身反应发生率分别为2.63%、19.00%,局部反应发生率分别为2.69%、16.13%。以上反应发生率均为WPDT组高于APDT组,差异均有统计学意义(P〈0.005)。随针次增加,接种副反应率有增加趋势。结论:APDT较WPDT接种副反应发生率低,用于儿童免疫安全性较好。  相似文献   

11.
目的:探讨血细胞形态学变化对深部真菌感染的诊断价值;方法:常规方法对深部真菌感染患者的外周血和骨髓进行血细胞形态学检查;结果:发现粒细胞系统反应性增生,并有较特异的形态学改变。主要为中性粒细胞的颗粒增多和空泡变性;结论:血细胞形态学变化对深部真菌感染具有提示性诊断价值。结合患者的临床资料,可对深部真菌感染作出初步诊断。  相似文献   

12.
目的探讨油橄榄叶提取物(OLE)对铅中毒小鼠骨髓NO含量和NOS活性的影响。方法选健康小鼠,每日灌胃醋酸铅溶液的同时灌胃不同剂量的OLE进行治疗,连续用药30 d,检测血铅含量、骨髓一氧化氮(NO)含量及一氧化氮合酶(NOS)活性的变化。结果与模型对照组相比,小鼠灌胃OLE后血铅水平下降,骨髓NO含量及NOS活性明显降低。结论 OLE对铅中毒小鼠有一定的疗效,能改善骨髓生化指标,拮抗铅对骨髓的毒性。  相似文献   

13.
Objective: To investigate the in-vitro antitumor immune responses of dendritoma formed by mouse hepatocellular carcinoma (HCC) cells and lymphotactin (Lptn) gene modified dendritic cells (DCs). Method: DCs prepared from mouse bone marrow were genetically modified by lymphotactin adenovirus, and fused with H22 cells by polyethylene glycol (PEG). RT-PCR and ELISA were employed to identify lymphotactin expression at mRNA and protein level. Cell phenotypes and fusion efficiency was detected by FACS. The stimulatory effect of DC on T cells was detected by mixed lymphocyte reaction. The cytotoxicity activity against H22 cells was assayed by LDH method. Results: Lymphotactin could be efficiently expressed by DCLptn/H22 hybridoma. DCLptn/H22 cells could induce potent T cell proliferation effect and generate strong cytotoxic T lymphocyte (CTL) reaction against allogenic H22 cells. Conclusion: Lymphotactin genetic modification could enhance the in vitro immune activity of the dendritoma.  相似文献   

14.
Objective: To study the effect and implication of nonmyeloablative donor specific bone marrow (DSBM) infusion on the immunoreaction of liver allotransplantation. Methods: Orthotopic liver transplantation model was used in this study. Groups were set as follows: Group Ⅰ, syngeneic control (Wistar-to-Wistar); Group Ⅱ, acute rejection (SD-to-Wistar); Group Ⅲ, acute rejection treated with cyclosporine A (CsA) by intramuscular injection (SD-to-Wistar CsA); Group Ⅳ, bone marrow infusion at 7 d pretransplantation followed by short-term CsA treatment (SD-to-Wistar DSBM); Another group of short-term CsA treatment preoperatively without bone marrow infusion was also set as control. General characteristics and survival time were observed.Histological grades of rejection were determined by pathological examination. IL-2 and IFN-γ level in peripheral blood and donor liver were detected respectively by Enzyme-Linked Immuno-Sorbent Assay (ELISA) and Western blot. Chimerism of donor cells was measured by PCR for a male-specific marker (Y-chromosome-specific sequence, Sry). Results: No signs of rejection were found in Group Ⅰ. Acute rejection occurred in both Group Ⅱ and the short-term CsA treated group. All the recipients died at (9~15)d posttransplantation with a median survival time of (10.7±0.5) d and (11.2±2.4) d, respectively. Only mild rejection could be seen in Group Ⅲ. In Group Ⅳ, 4 out of 6 recipients had long-term survival (>100 d), the histological grade of rejection was significantly lower than that of Group Ⅱ, so did the expression level of IL-2 and IFN-γ in both peripheral blood and grafted liver.Y-chromosome-specific sequence (Sry) of male SD rats could be detected in the bone marrow, spleen and thymus of female recipients at 15 d after bone marrow infusion. Conclusion: Mild preconditioning nonmyeloablative donor specific bone marrow infusion can enhance chimerism formation in recipients, alleviate the rejection of liver allotransplantation and prolong survival of liver allotransplantation.  相似文献   

15.
16.
目的:探讨外源性EGFP基因转染修饰兔骨髓间充质干细胞(m esenchymal stem cells,MSCs)的可行性。方法:用增强型荧光绿色蛋白(enhanced green fluorescent protein,EGFP)作为报告基因,以脂质体法转染骨髓间充质干细胞,观察转染结果、表达情况及对靶细胞活力的影响。结果:经荧光显微镜下观察证实:成功地对骨髓间充质干细胞实现了基因转染。结论:兔骨髓间充质干细胞能够在体外适宜的条件下进行长期培养;骨髓间充质干细胞可直接作为基因靶细胞,建立稳定表达EGFP的骨髓间充质干细胞系具有可行性,为进一步做标记的MSCs细胞的移植研究奠定基础。  相似文献   

17.
Objective: Large segmental bone defect repair remains a clinical and scientific challenge with increasing interest focusing on combining gene transfection with tissue engineering techniques. The aim of this study is to investigate the effect of connective tissue growth factor (CTGF) on the proliferation and osteogenic differentiation of the bone marrow mesenchymal stem cells (MSCs). Methods: A CTGF-expressing plasmid (pCTGF) was constructed and transfected into MSCs. Then expressions of bone morphogenesis-related genes, proliferation rate, alkaline phosphatase activity, and mineralization were examined to evaluate the osteogenic potential of the CTGF gene-modified MSCs. Results: Overexpression of CTGF was confirmed in pCTGF-MSCs. pCTGF transfection significantly enhanced the proliferation rates of pCTGF-MSCs (P<0.05). CTGF induced a 7.5-fold increase in cell migration over control (P<0.05). pCTGF transfection enhanced the expression of bone matrix proteins, such as bone sialo-protein, osteocalcin, and collagen type I in MSCs. The levels of alkaline phosphatase (ALP) activities of pCTGF-MSCs at the 1st and 2nd weeks were 4.0- and 3.0-fold higher than those of MSCs cultured in OS-medium, significantly higher than those of mock-MSCs and normal control MSCs (P<0.05). Overexpression of CTGF in MSCs enhanced the capability to form mineralized nodules. Conclusion: Overexpression of CTGF could improve the osteogenic differentiation ability of MSCs, and the CTGF gene-modified MSCs are potential as novel cell resources of bone tissue engineering.  相似文献   

18.
目的:研究IL-4mRNA和IL-4蛋白在哮喘大鼠CD34^+细胞中的转录表达及孟鲁司特(montelukast,MK)对其表达的影响。方法:将SD大鼠随机分为3组:哮喘组、MK组和正常对照组。用卵白蛋白制备大鼠哮喘模型。应用双抗体夹心酶联免疫吸附试验测定血浆中IL-4和γ-干扰素(IFN-γ)浓度;用MiniMACS磁珠分选系统分离骨髓CD34^+细胞;采用SYBRGREEN I荧光实时定量PCR法测定CD34^+细胞中IL-4mRNA的相对表达量。采用免疫组化技术测定CD34+细胞中IL-4蛋白的表达量。结果:哮喘组骨髓CD34+细胞中IL-4mR.NA和IL-4蛋白的表达量高于其它各组(p〈0.01);哮喘组除了IFN-1水平低外,IL-4浓度和嗜酸性粒细胞(EOS)绝对值都是三组中最高的(P〈0.01);除哮喘组外,其余组的各项指标相近(P〉0.05)。IL-4mRNA表达量与IL-4浓度、Eos绝对值呈正相关(P〈0.01),与IFN-γ浓度呈负相关(P〈0.01)。结论:哮喘大鼠骨髓CD34^+细胞中IL-4 mKNA的表达增强;孟鲁司特可以下调IL-4mRNA的表达。可能成为其抑制哮喘气道炎症形成的重要机制之一。  相似文献   

19.
Objective: To explore clinical and laboratory features and significance of detecting serum carbohydrate antigen 125 (CA125) in immunoglobulin E (IgE) multiple myeloma. Methods: We reported the clinical findings of a male patient with IgE myeloma and elevated level of serum CA125 and reviewed the literature. Results: Laboratory tests of this patient on admission showed extremely high serum IgE and CA125, a bone marrow aspirate revealed abnormal plasma cells (38.4% of nucleated cells: 16.4% mature and 22% atypical), and in bone marrow biopsy, immunoperoxidase staining showed positive cytoplasmic staining for IgE and κ light chain within the vast majority of plasma cells. Computed tomography (CT) bone scans indicated wedge shape change and compressive fracture of thoracic vertebrae, and emission computed tomography (ECT) discovered multiple punctiform aggregation of radiation in both cervical ribs and spine. The serum IgE and CA125 gradually decreased to normal limits after eight cycles of chemotherapy. This patient is alive well with an 18-month complete remission. Conclusion: We reported the first case of IgE myeloma with elevated level of serum CA125. To further evaluate clinical characteristics and significance of CA125 in IgE myeloma, more cases are needed.  相似文献   

20.
骨髓间充质干细胞(MSC)是骨髓中不同于造血干细胞的另一类干细胞。MSC作为骨髓基质细胞的一部分,构成了造血微环境的主要细胞,在造血调控中发挥着重要的作用。研究MSC与造血作用的关系及其机理,在血液系统疾病的临床实践中具有广阔的应用前景。  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号