肺炎克雷伯菌质粒β-内酰胺酶的筛选及其耐药性

目的了解头孢类耐药肺炎克雷伯菌(KPN)质粒β-内酰胺酶的分布及耐药性,寻求最佳的检测方法. 方法双纸片协同试验和三维试验检测超广谱β-内酰胺酶(ESBLs),表型筛选法和三维试验检测质粒AmpC酶. 结果 182株KPN中,ESBLs检出率双纸片协同试验为42.85%、三维试验为45.05%,两法总符合率为95.12%;表型筛选法显示9株(4.9%)产AmpC酶,三维试验则为7株(3.8%);4株(2.2%)同时产两种酶;产酶株对三代头孢高度耐药,对喹诺酮类、复方新诺明交叉耐药率也很高,对氨基糖苷类有一定敏感性,尚未发现亚胺培南耐药株. 结论 KPN质粒β-内酰胺酶以ESBLs为主;双纸片协同试验操作简便,为检测ESBLs最常用方法;AmpC酶表型筛选法只能作为初筛,确证还需用三维试验证实.     

Continuous and online analysis of heart rate variability

Spectral analysis of heart rate variability provides a probe to assess the function of the sympathetic and parasympathetic nervous systems. Time-frequency analysis of heart rate variability is useful for investigating autonomic nervous function in patients with syncope or non-sustained ventricular tachycardia, or in anaesthesia, etc. In this paper, we developed an algorithm for continuous and online analysis of heart rate variability. The algorithm was simulated and evaluated in MATLAB, and implemented on the digital signal processor. The electrocardiogram signals from MIT/BIH arrhythmia database and one patient with syncope demonstrate the capability of the proposed method in the continuous and online analysis of heart rate variability.     

In vivo albendazole treatment of Taenia crassiceps cysticerci strain WFU: proliferation, damage, and recovery

Taenia crassiceps has been widely experimented as a model for in vitro and in vivo studies on drug responses. The purpose of this study was to treat BALB/c mice infected with T. crassiceps strain WFU with commercially available albendazole and to analyze the reduction in parasite infrapopulations. Here, we describe the reduction and apparent damage of T. crassicceps WFU cysticerci in infected mice after antihelminthic drug treatment and subsequent inoculation of those treated parasites into a naïve host. We were able to reduce significantly the parasite counts to 33 and 48 % after albendazole treatment for 20 or 25 days and compared with the untreated mice. We also observed morphological damage such as the partial blebbing in the tegument and parenchyma of treated parasites, as well as disorganized musculature and the loss of cell membranes in subtegumental tissue section. However, larvae from albendazole-treated mice inoculated into the next host were able to become re-established in the next murine host due, probably, to the survival of proliferative parasite cells.     

以智慧化献血服务改善献血者体验

献血服务全过程从数据化向智慧化发展是大势所趋。献血服务始终围绕献血者展开，以献血者为中心的特点，决定了科学技术手段应用的终极目标为人的体验和感受。借助智慧管理精准识别献血者需求，是提升献血服务水平的首要任务。以武汉血液中心智慧化献血服务为例，阐述了智慧化为献血者带来的全新体验。     

矽肺大鼠肺组织let-7d-3p和miRNA-21-5P差异表达及其初步分析

目的探索let-7d-3p和miRNA-21-5p在二氧化硅(SiO_2)诱导的大鼠纤维化肺组织中的差异表达及其意义。方法 SPF级Wistar雄性大鼠随机分为对照组和模型组,每组30只,采用一次性气管内灌注1 ml SiO_2悬浊液建立大鼠矽肺模型,对照组大鼠相同方法灌注1ml灭菌生理盐水。分别于染尘后1、7、14、21、28 d采集各组大鼠肺组织,每组取6只,对3只大鼠肺组织进行病理学观察,另外3只采用miRNA微阵列芯片技术筛选肺组织中差异表达的miRNA,通过miRNA芯片筛选结合反转录定量聚合酶链式反应(RT-qPCR)验证let-7d-3p和miRNA-21-5p在两组间的表达水平,对let-7d-3p和miRNA-21-5p进行靶基因预测并进行GO(gene ontology)富集分析和KEGG(kyoto encyclopedia of genes and genomes)通路分析。结果对照组大鼠1、7、14和21 d Masson染色均可见正常肺组织,未发现胶原纤维,28 d大鼠肺间质和支气管周围仅有少量纤细的胶原分布;模型组大鼠1 d和7 d未发现胶原纤维,14 d染色可见较多以淋巴细胞为主的炎症细胞浸润,未见明显纤维组织,21 d和28 d模型组大鼠肺间质内可见大片状密集的胶原纤维沉积,在肉芽组织、支气管及血管壁周围胶原蛋白增生明显。模型组中let-7d-3p的表达水平均显著下调,miRNA-21-5p表达水平均显著上调,与对照组相比差异均有统计学意义(P0.05)。结论模型组中let-7d-3p和miRNA-21-5p表达变化明显,可能与早期矽肺的发生发展有关。     

中心动脉压与老年肾功能相关性的研究进展

中心动脉压与高血压靶器官损害之间存在许多联系,高血压靶器官损害的病理机制和中心动脉压相关。肾功能损害是老年高血压常见并发症,中心动脉压升高与老年高血压肾损害发生有非常密切的关系。降压治疗能显著降低肾脏早期损害,从而降低终末期肾病的发生率和病死率。现将中心动脉压与老年高血压人群肾功能关系做一综述。