真核表达人呼吸道合胞病毒F蛋白的纯化方法

目的 真核表达人呼吸道合胞病毒(human respiratory syncytial virus,SV)融合蛋白(fusion protein,),并完成蛋白纯化及纯度测定.方法 根据编码F蛋白的基因序列设计引物,CR方法扩增出3'端带His标签的F基因序列,克隆入pGEM-T-easy载体,经核酸序列分析后,进一步克隆到pcDNA3.1( )真核表达载体,限制性内切酶鉴定,用脂质体Lipofectamine2000转染COS-7细胞,2 h后再用Westem blot检测目的蛋白的表达.Ni柱亲和层析纯化COS-7细胞表达的F蛋白,高效毛细管电泳分析纯化后蛋白纯度.结果 核酸序列分析证实获得带His标签的RSV F基因序列,没有发生无义突变.转染COS-7细胞后,利用Western blot方法检测到F蛋白的特异性条带,纯度达99%以上.结论 初步建立了真核表达RSV F蛋白的纯化方法,为进一步优化RSV F蛋白制备条件及单克隆抗体及诊断试剂等研究奠定了基础.     

Nosocomial and community acquired uropathogenic isolates of Proteus mirabilis and antimicrobial susceptibility profiles at a university hospital in Sub–Saharan Africa

ObjectiveTo ascertain antimicrobial susceptibility profile of Proteus mirabilis (P. mirabilis) from clinical urine specimens at a university hospital in the spate of its recorded increasing resistance patterns.MethodsThe study was retrospective in nature. Data generated from urine cultures of patients at University of Calabar Teaching Hospital for a period of five years (2004–2009) were compiled. Relevant information obtained were age and gender of patients, organisms recovered and their antibiotic susceptibility patterns. P. mirabilis was identified using standard laboratory procedures.ResultsP. mirabilis showed the highest resistance against ampicillin, cloxacillin, amoxicillin, tetracycline, co-trimoxazole, erythromycin and chloramphenicol (100%–37.2%) while colistin, ofloxacin, ciprofloxacin, ceftriaxone, nalidixic acid and nitrofurantoin recorded the highest activity (59.1%–96.9%) with no drug recording 100% activity. The resistance of the nosocomial isolates of the organism were significantly higher than the community acquired isolates against that of the common antibiotics in use (P<0.05).ConclusionsExtreme caution should be exercised in antibiotic administration in hospital setting and the potential benefits adequately assessed while control of nosocomial infections be given a priority so as to limit the spread of resistant bacteria.     

Quantity not composition of dietary fats represents the dominant contributor to experimental obesity: Relevance to human pathophysiology

Plant fats are low in saturated fats but high in unsaturated fats compared to animal fats, and are supposedly less obesogenic. This study compared the obesogenic effects of plant and animal derived fatty diets in Wistar rats. Rats of each gender were divided into three dietary (standard chow (SC), high fat diet rich in animal fat (HFDaf) and a high fat diet rich in plant fat (HFDpf)) groups of ten each and fed for 17 weeks. Anthropometric, Adiposity and nutritive variables were assessed using standard methods. Comparing HFDpf to HFDaf: Abdominal circumference (AC),initial feed intaken (IFI), final feed intake(FFI), final body weight (FBW), white adipose tissue (WAT) were increased but brown adipose tissue (BAT) decreased in male rats fed with HFDpf; also, there were increased body length, IFI, FFI but decreased AC, FBW, BAT in female rats fed with HFDpf. Comparing male to female rats: Thoracic circumference, IFI, FFI, energy intake were increased while Adiposity index decreased across diet groups in male rats; the AC, FBW increased while WAT, BAT decreased in HFDpf fed group, also, BAT was increased but AC, FBW decreased in HFDaf fed group in male rats. Palatability and high feed efficiency of consumed diets were more associated with obesogenic risk than just the level of saturation. Therefore, Obesogenic effects of fatty diets in both genders is more dependent on the quantity (amount) of fatty diet consumed than the dietary fat composition alone.     

Platelet-leukocyte interaction: selective binding of thrombin- stimulated platelets to human monocytes, polymorphonuclear leukocytes, and related cell lines

The association of platelets with leukocytes was investigated, using gel-filtered platelets stimulated with thrombin and then fixed with formaldehyde. Evidence is presented that stimulation of gel-filtered platelets with low concentrations of thrombin (0.01 to 0.1 U/mL) induces the expression of surface determinants interacting strongly with monocytes and polymorphonuclear leukocytes (PMNs) but only weakly with lymphocytes. Both monocyte-platelet binding and PMN-platelet binding occurred at 37 degrees C and more intensively at 0 degrees C; it was Ca2+-dependent and was unaffected by the addition of sodium azide. The binding also occurred with the monocytoid cell lines HL 60 and U 937 in exponential growth and was much less two days after induction of terminal differentiation by phorbol myristate acetate (PMA). No other tested cell lines (B cells, T cells, and myeloid cells) bound thrombin-stimulated platelets. Monocyte-derived macrophages kept in culture for one week also exhibited reduced binding of thrombin- stimulated platelets. IgG and fibronectin could be ruled out as ligands that mediate binding.     

循证护理应用才精神科患者的效果评价

目的运用循证医学的思维方法，探讨在精神科护理工作中开展循证护理所达到的临床康复效果。方法将120例男性住院精神分裂症患者随机分为研究组和对照组各60例，研究组接受为期2个月的以循证理论为依据的综合性心理护理和技能训练，对照组常规给予一般支持性心理护理。采用护士用住院患者观察量表（NOSIE）、简明精神病评定量表（BPRS）、社会功能缺陷筛选量表（SDSS）、精神科症状自评量表（SCL-90）和自制的患者满意度／舒适度调查表作为评价工具，比较2组干预后的效果。结果入组时，所有量表评分2组间比较差异均无统计学意义（P〉0.05），经过2个月的治疗和循证干预后，2组间各量表评分比较，研究组优于对照组，差异均有统计学意义（P〈0.05）。结论循证护理可促进科学、有效的精神科护理实践活动，有助于促进精神分裂症患者的临床治疗和康复，为科学有效的临床护理决策提供依据和工作方法。     

Dental radiography: efficacy in the assessment of intraosseous lesions of the face and jaws in asymptomatic patients

In this investigation the efficacy of dental radiography for the detection of occult intraosseous lesions of the face and jaws was evaluated. An analysis of 30 million health insurance records indicated that the period prevalence of malignant lesions was less than 5 cases/million/year, and for benign lesions approximately 100 cases/million/year. Data from a controlled observer-performance study showed that radiographic sensitivities ranged between 50% and 80%. The cost per true-positive finding was estimated to be +8.6 million per malignant case and +430,000 per benign case. An assessment of the dosimetric literature indicated that the benefits of radiographic screening as a means for early detection of a malignancy appear to be counterbalanced by the risk of causing a radiation-induced malignancy. Taken together, these data demonstrate that dental radiography is not efficacious for the purpose of detecting occult lesions.     

早期严重多发伤患者全血CD3^＋．CD4^＋．CD8^＋的变化

目的观察多发伤患者早期全血中CD3^＋（CD3阳性淋巴细胞）、CD4^＋（CD4阳性淋巴细胞）、CD8^＋（CD8阳性淋巴细胞）的动态变化并探讨多发伤与免疫的关系。方法观察2005年-2007年我院多发伤患者人院1wk内CD3^＋、CD4^＋．CD8^＋浓度的变化。结果24h内CD3^＋、CD4^＋．CD4^＋/CD8^＋比值明显降低，48h之后CD4^＋值降低不明显，而CD8^＋降低，CD4^＋／CD8^＋比值恢复。结论严重多发伤后患者免疫功能受到明显抑制，在72h之前达到高峰，此后缓慢地回升。     

持续性房颤与血浆硫化氢水平的关系研究

目的：观察持续性房颤患者血浆硫化氢(H2S)水平的变化,研究其与持续性房颤的关系。方法选择本院2013年4月~2014年7月心内科住院的持续性房颤患者60例为病例组,其中男性32例,女性28例,平均年龄(61.07±10.35)岁。选取同期健康人60例为对照组,其中男性30例,女性30例,平均年龄(60.13±9.64)岁。采用敏感硫电极法测定血清H2S水平。结果病例组血浆H2S水平显著低于对照组(P<0.01)。结论持续性房颤的发生可能与血浆H2S水平的降低有关。