中和剂对化妆品中霉菌和酵母菌检测结果的影响

目的探讨卵磷脂和吐温80作为中和剂对化妆品中霉菌和酵母菌检测结果的影响。方法使用虎红培养基和添加中和剂卵磷脂和吐温80的虎红培养基检测市售化妆品和经黑曲霉、白色念珠菌加标的化妆品的霉菌和酵母菌。结果用虎红培养基和卵磷脂、吐温80-虎红培养基分别检测市售化妆品,均未检出黑曲霉、白色念珠菌;检测黑曲霉加标化妆品,添加中和剂后,菌落数增加,差异有统计学意义(t=5.24,P0.05);检测白色念珠菌加标化妆品,添加中和剂后,菌落数增加,差异有统计学意义(t=3.185,P0.05)。结论卵磷脂和吐温80作为中和剂对化妆品中霉菌和酵母菌的检测结果有影响,可提高其检出结果。建议在化妆品检测标准方法中采用添加中和剂的培养基检测霉菌和酵母菌。     

64排螺旋CT血管造影和冠状动脉造影诊断冠心病的临床比较

目的 :对比分析CT血管成像(computed tomography angiography,CTA)与数字减影血管造影(digital subtraction angiography,DSA)成像,探讨64排螺旋CT冠状动脉成像技术在冠心病临床诊断中的价值。方法 :随机选取32例疑似或确诊为冠心病的住院患者,进行CTA及DSA检查(CTA检查均在DSA前1周内完成),对结果进行对比分析。结果:共分析了32例患者的全部血管节段(243个),DSA检测到病变节段138处,无病变节段105处,CTA检测到病变节段129处,无病变节段114处;CTA诊断冠状动脉狭窄的敏感性为91.3%,特异性为97.1%,阳性预测值为97.7%,阴性预测值为89.5%,准确率为93.8%;CTA检查发现59支冠状动脉血管有斑块,DSA检查发现62支有斑块,二者之间比较无显著性差异;CTA与DSA对狭窄程度<50%、50%~75%、>75%的所有部位病变的检出数目分别为18、24处,35、32处,6、6处,二者比较均无显著性差异。结论 :64排螺旋CT冠状动脉成像技术对冠状动脉狭窄的诊断较为准确,是诊断冠心病和评价冠状动脉狭窄的一种有效的无创性检查方法。     

单尖法冷牙胶侧压法及热牙胶根管充填技术的临床分析

目前临床上治疗牙髓病及根尖周病的最有效手段就是根管治疗。而其中最重要的步骤就是根管充填。但是到目前为止,还没有一种根充方法能高效封闭全根管系统,彻底阻止微渗漏的发生。故本文对单尖法根管充填技术、冷牙胶侧方加压法根管充填技术及热牙胶根管充填技术在治疗效率、固体根充材料的比例、对压根抗折性能的影响、根尖的封闭性、应用现状等方面作分析,以便指导临床操作。     

口腔修复前正畸治疗的临床应用

目的探讨口腔修复前进行正畸治疗的临床效果。方法回顾性分析32例口腔修复前行正畸治疗患者的临床资料。结果 32例患者经口腔修复前正畸治疗后,牙齿咬合功能均获得良好改善,具有发音和口腔美观效果较佳,治疗过程中及治疗后均未出现明显不良反应。结论口腔修复前正畸治疗可获取理想的修复基础,有效保留牙髓的活性。     

Role of bile acids in liver diseases mediated by the gut microbiome

The intensive crosstalk between the liver and the intestine performs many essential functions. This crosstalk is important for natural immune surveillance, adaptive immune response regulation and nutrient metabolism and elimination of toxic bacterial metabolites. The interaction between the gut microbiome and bile acids is bidirectional. The gut microbiome regulates the synthesis of bile acids and their biological signaling activity and circulation via enzymes. Similarly, bile acids also shape the composition of the gut microbiome by modulating the host’s natural antibacterial defense and the intestinal immune system. The interaction between bile acids and the gut microbiome has been implicated in the pathophysiology of many intestinal and extra intestinal diseases, especially liver diseases. As essential mediators of the gut-liver crosstalk, bile acids regulate specific host metabolic pathways and modulate the inflammatory responses through farnesoid X-activated receptor and G protein-coupled bile acid receptor 1. Several clinical trials have demonstrated the signaling effects of bile acids in the context of liver diseases. We hypothesize the existence of a gut microbiome-bile acids-liver triangle and explore the potential therapeutic strategies for liver diseases targeting the triangle.     

Fractal correlation properties of R-R interval dynamics in asymptomatic relatives of patients with dilated cardiomyopathy

BACKGROUND AND AIM: asymptomatic relatives of patients with familial dilated cardiomyopathy who have left ventricular enlargement [LVE] are at risk for progression to dilated cardiomyopathy. A novel index of the fractal correlation properties of heart rate variability (HRV), the short-term scaling component (proportional, variant(1)) in detrended fluctuation analysis, is a promising prognostic tool in left ventricular dysfunction. The aim of this study was to compare values of proportional, variant(1) and conventional HRV indices in LVE relatives with dilated cardiomyopathy patients and normal controls. METHODS: time-domain and spectral HRV measures, and the short-term scaling component ( proportional, variant(1)) were assessed from 24-h Holter recordings from 22 LVE relatives (left ventricular end-diastolic dimension >112% predicted, normal fractional shortening), 24 dilated cardiomyopathy patients and 14 controls. RESULTS: the time domain index SDNN was lower in dilated cardiomyopathy patients [101.8(+/-44.0)] than in LVE relatives [161.7(+/-53.9)] or controls [152.9(+/-51.4)], P=0.01. Similarly, triangular index and spectral measures were reduced in dilated cardiomyopathy patients but not in LVE relatives or controls. In contrast, the short term scaling component ( proportional, variant(1)) in detrended fluctuation analysis was reduced in both dilated cardiomyopathy patients [1.06(+/-0.33)] and in LVE relatives [1.15 (+/-0.20)], compared with controls [1.32(+/-0.16)], P=0.01. Among DCM patients the short-term scaling component ( proportional, variant(1)) was significantly associated with echocardiographic deterioration during follow-up (3.7+/-2.1 year) (P=0.004). CONCLUSION: the short-term scaling component ( proportional, variant(1)) is reduced in asymptomatic relatives of dilated cardiomyopathy patients who have LVE.     

乳凝集素调节EEI-10细胞IL-2,IL-4及IFN-γ的分泌表达

目的:探讨乳凝集素调节肠相关淋巴组织淋巴细胞分泌表达细胞因子的作用.方法:应用基因重组技术从MCF-7乳腺癌细胞中提取总RNA,通过逆转录PCR方法得到目的基因(乳凝集素)片段,利用酶切,连接等技术,将目的基因构建至PET28载体内,转化入DH5a细胞后,鉴定阳性质粒;将含有目的基因的阳性质粒转化入表达细胞BL-21,IPTG诱导表达目的蛋白乳凝集素,应用特异性镍鏊合的亲和层析柱得到纯化的目的蛋白.利用H3-Tdr法明确乳凝集素剂量与人类肠上皮内淋巴细胞株EEI-10细胞增殖之间的关系.给予适当剂量乳凝集素作用于EEI-10细胞后,利用ELISA方法检测EEI-10分泌IL-2,IL-4及IFN-γ浓度,应用RT-PCR方法检测IL-2,IL-4及IFN-γmRNA表达.结果:酶切阳性的质粒经测序证实与基因文库一致.所得纯化的目的蛋白进行SDS-PAGE电泳和特异性抗体鉴定,明确为目的蛋白乳凝集素.利用H3-Tdr法检测乳凝集素剂量与细胞增殖之间的关系,结果显示乳凝集素作用剂量为250mg/L时淋巴细胞增殖显著.给予乳凝集素处理后细胞培养上清中IL-2(P=0.0394)和IFN-γ(P=0.0082)的含量高于未处理细胞组,而IL-4没有显著的增高;同时处理后IL-2mRNA表达量升高,IL-4mRNA表达量无显著性改变,IFN-γmRNA表达量明显增高并高于PHA刺激组.结论:乳凝集素具有上调EEI-10细胞分泌和表达IL-2和IFN-γ的作用.     

经脾脏hMSCs移植对乙酰氨基酚所致小鼠急性肝损伤的治疗作用

目的:评价经脾脏途径行骨髓间充质干细胞(hSMCs)移植对对乙酰氨基酚所致小鼠急性肝损伤的疗效.方法:建立对乙酰氨基酚导致的急性药物性肝损伤动物模型,将SCID小鼠20只.随机分成2组,经脾脏注射组和对照组(n=10),经脾脏途径行hSMCs移植,采用肝功能检查、免疫荧光、荧光显微镜、网状纤维染色等方法观察hMSC移植前后重症联合免疫缺陷病(severecombined immunodeficiency disease,SCID)小鼠肝腺泡结构的恢复与肝功能的改善情况.结果:SCTD小鼠肝功能在经脾脏移植组与对照组相比较呈现显著性改善(28 d时,ALT:26.3U/L vs 50.1 U/L,P<0.01;AST:108.0 U/L vs154.3 U/L,P<0.05;ALB:40.0 g/L vs 31.9 g/L,尸<0.05).免疫荧光显示经脾脏移植的hMSCs在脾脏、肝脏均有较多量定植、分化与增殖.免疫荧光观察到脾脏移植后肝腺泡结构有较明显改善.结论:经脾脏途径行hMSCs移植能改善小鼠急性肝损伤肝功能,hMSCs在小鼠肝内生长良好,是hMSCs移植治疗的有效途径.     

在暗娼中预防AIDS综合干预研究

目的 降低暗娼感染HIV的危险性。方法 营造支持环境，对暗娼实施流动宣传和100％的安全套推广使用，提供规范的、可及的性病诊治服务，开展同伴教育等综合干预措施。结果 目标人群的性病艾滋病防治知识的知晓率得到了普遍的提高，能正确回答有关艾滋病传播途径8个条目的人数从7％上升到96％；安全套使用率明显提高，与临时性伴侣最近一次性行为使用安全套的比例从34．7％上升到84％；性传播感染(STI)的感染率从61．4％下降到36．7％；在目标人群中建立了一支同伴教育者队伍。结论 对暗娼实施综合干预可有效降低STI的感染率和感染HIV的危险性。