Halobacillus trueperi SL39 Ectoine诱导生成条件研究

研究了耐盐菌Halobacillus trueperi SL39在NaCl的诱导下，体内合成渗透压补偿溶质Ectoine，并优化Ectoine合成的诱导条件。采用高效液相色谱检测Ectoine合成量，结果表明，耐盐菌Halobacillus trueperi SL39合成Ectoine的最适诱导条件为30℃，初始pH7．0，NaCl浓度2．0mol／L，诱导48h，合成量高达304．8mg／L，胞外释放量为90．11％。     

絮凝剂产生菌Diaphorobacter Z-052的发酵研究

从污水处理厂活性污泥中筛选出1株有絮凝活性的细菌Z-052，经分子生物学鉴定为Di-aphorobacter属。对Z-052产絮凝剂的发酵条件进行了优化。研究结果表明，在优化培养基中，于30℃培养72h，其发酵液对4g／L高岭土悬液的絮凝活性可达93．2％。Z-052絮凝剂对活性炭、土壤、酵母等固体颗粒悬液的絮凝活性分别达到95．1％、80．4％和72．4％。     

小型猪生物可降解支架置入术中不同麻醉方法的研究

目的 比较两种不同麻醉方法对小型猪的麻醉效果.方法 将12头小型猪随机分成两组,每组6头,一组是戊巴比妥钠复合氯胺酮静脉麻醉(Ⅰ组),另一组是丙泊酚复合氯胺酮静脉麻醉(Ⅱ组).麻醉后对动物实施心脏生物可降解支架置入术,观察动物麻醉起效时间、苏醒时间、麻醉效果、呼吸频率(RR)、心率(HR)、血氧饱和度(SpO2)及术后苏醒情况.结果 两种方法麻醉后,动物分别在7.6 ±2.4 min(Ⅰ组)、2.4 ±1.4 min(Ⅱ组)进入麻醉状态(P＜0.05).术后苏醒时间分别为30.8±8.8 min(Ⅰ组)、16.5±2.8min(Ⅱ组)(P＜0.05),Ⅱ组动物比Ⅰ组动物苏醒平稳(P＜0.05).两组心率及呼吸频率变化无明显差别,而氧饱和度在第10 min(Ⅰ组87％,Ⅱ组92％)和30 min(Ⅰ组94％,Ⅱ组89％)由于追加麻醉药后,两组值差异较大,但很快恢复正常.Ⅱ-组麻醉效果较Ⅰ组麻醉效果好.结论 两种麻醉方法均能达到良好的麻醉效果,丙泊酚复合氯胺酮麻醉较戊巴比妥钠复合氯胺酮麻醉的效果强且术后苏醒快,是一种比较理想的麻醉方法.     

Magnifying endoscopy with narrow-band imaging may improve diagnostic accuracy of differentiated gastric intraepithelial neoplasia: a feasibility study

Background  Magnifying narrow-band imaging has enabled observation of the mucosal and vascular patterns of gastrointestinal lesions. This study investigated the potential value of magnifying endoscopy with narrow-band imaging for the classification of gastric intraepithelial neoplasia.

Methods  Seventy-six patients with gastric intraepithelial neoplasia (82 lesions) at People’s Liberation Army General Hospital from December 2009 to November 2010 were analyzed. All patients underwent magnifying endoscopy with narrow-band imaging, and their lesions were differentiated into probable low-grade intraepithelial neoplasia or possible high-grade intraepithelial neoplasia on the basis of the imaging features. Pathologic proof was subsequently obtained by endoscopic submucosal dissection in every case. The validity of magnifying endoscopy with narrow-band imaging was calculated, considering histopathology to be the gold standard.

Results  Magnifying endoscopy with narrow-band imaging showed 22 low-grade intraepithelial neoplastic lesions and 60 high-grade intraepithelial neoplastic lesions. Of the 22 low-grade intraepithelial neoplastic lesions, 16 showed the same results on both imaging and pathology. Of the 60 high-grade intraepithelial neoplastic lesions, 53 showed the same results on both imaging and pathology. Thus, the sensitivity of magnifying endoscopy with narrow-band imaging for high-grade intraepithelial neoplasia was 89.83%, which was higher than that for low-grade intraepithelial neoplasia (69.57%). However, the specificity for high-grade intraepithelial neoplasia (69.57%) was lower than that for low-grade intraepithelial neoplasia (89.83%). The overall accuracy of magnifying endoscopy with narrow-band imaging was 84.15%.

Conclusions  Magnifying endoscopy with narrow-band imaging can distinguish between gastric low- and high-grade intraepithelial neoplasia. It may be a convenient and effective method for the classification of gastric intraepithelial neoplasia.

     

生物合成共轭亚油酸菌种的筛选与鉴定

从传统泡菜和生牛乳中筛选出一株乳酸菌ZS2058能生物合成共轭亚油酸,经API系统鉴定为植物乳杆菌(Lactobacillusplantarum).该菌株在MRS培养基中将质量分数11.6%的亚油酸(1.024mg/mL)转化为共轭亚油酸,经气相色谱分析证实c9,t11 18∶2占75.9%,t10,c12 18∶2占24.1%.     

流式微球分析技术检测人心肌钙蛋白T的方法学性能评价

目的对自建的流式微球分析技术（Cytoometric bead assay,CBA）检测人肌钙蛋白T（cTnT）的方法进行性能评价。方法参照美国临床和实验室标准化协会（CLSI）系列文件,结合工作实际,对方法的精密度、准确度、分析灵敏度、分析测量范围、回收试验、干扰试验进行了评价,并进行试验比对。结果 CBA检测cTnT在高低浓度范围内批内变异系数分别为5.21%和11.31%,批间变异系数分别为6.24%和13.16%,准确度相对偏倚在3.17%～5.39%之间,回收率在94.7%～111.5%之间;检测灵敏度为16.00ng/L,分析测量范围为16.00～5000ng/L,人体正常含量或含量偏高的三酰甘油、胆固醇和胆红素对cTnT检测的干扰很小,与电化学发光分析技术无显著差异。结论自建CBA检测cTnT技术性能较好,符合公认的质量指标,可在临床工作中推广使用。     

腹膜透析患者和血液透析患者生活质量的纵向变化

目的对腹膜透析（Peritoneal Dialysis，PD）和血液透析（Hemodialysis，HD）患者进行长期随访和应用SF-36评定量表进行生活质量的纵向观察。方法38例PD患者和43例HD患者进行42个月的随访观察，并在随访开始时及结束时应用SF-36进行生活质量评分。结果PD患者在随访结束时存活18例，死亡共11例，其中死于心血管疾病3例，猝死2例，脑血管疾病3例，周围血管病1例，恶性肿瘤2例。肾移植存活3例，转入HD仍存活3例，失访3例。HD患者在随访结束时存活28例，死亡共9例，其中死于心血管疾病2例，严重甲状旁腺功能亢进2例，营养不良1例，猝死1例，死于肾移植术2例，恶性肿瘤1例，失访3例，肾移植后存活3例。PD组及HD组的躯体综合得分均较随访开始时有显著下降，两种透析方式之间，躯体得分下降的差异无统计学意义。结论PD和HD患者死亡的主要原因是心血管疾病，透析患者随透析时间的延长，生活质量有显著下降，但透析方式对患者的生活质量无显著影响。