某集约化鸡场鸡毒支原体感染的血清学调查

采用血清平板凝集试验，对某集约化鸡场的不同鸡群共454例进行了鸡毒支原体的检测，结果显示该鸡肠种母鸡、蛋母鸡、种公鸡群MG阳性率分别为100％，85.86%,82.09%，平均阳性率为83.70%。本病为条件性传染病。     

抗原热灭活对小鼠肺炎支原体ELISA检测的影响

目的优化小鼠肺炎支原体ELISA检测方法,降低非特异性反应。方法肺炎支原体热灭活处理后制备ELISA板,检测小鼠血清,与常规ELISA及分离培养方法相比较。结果优化后的ELISA方法平均本底值为0.03,敏感度为1:1280;优化ELISA方法与分离培养方法的符合率为99.27%,比常规ELISA方法高;PCR验证改进后的ELISA方法具有较好的准确性。结论优化后的方法准确性好,灵敏度高,对小鼠肺炎支原体的检测具有重要的实际意义。     

Antimycoplasmic activity and seasonal variation of essential oil of Eugenia hiemalis Cambess. (Myrtaceae)

The purpose of this work was to study the chemical composition and antimycoplasmic and anticholinesterase activities of the essential oil of Eugenia hiemalis leaves collected throughout the year. A total of 42 compounds were identified by CG, and are present in almost every seasons. Sesquiterpenes were dominant (86.01–91.48%), and non-functionalised sesquiterpenes comprised the major fraction, which increased in the summer; monoterpenes were not identified. The major components were spathulenol (5.36–16.06%), δ-cadinene (7.50–15.93%), bicyclogermacrene (5.70–14.24%) and β-caryophyllene (4.80–9.43%). The highest oil yield was obtained in summer and autumn. Essential oils presented activity against three evaluated Mycoplasma strains, but no activity was observed in the anticholinesterase assay.     

慢性肺部炎症合并肺炎支原体肺炎小鼠模型的建立

目的肺炎支原体肺炎(MPP)是肺炎支原体(MP)引起的以肺间质纤维结缔组织增生为主要病理改变的间质性肺炎。在临床易感于慢性肺部炎症病人,基于此原因本研究使用烟熏并肺炎支原体感染方法建立慢性肺部炎症合并肺炎支原体肺炎实验动物模型。方法本研究采用Realtime PCR、HE和Masson染色方法观察小鼠感染前后肺部肺炎支原体浓度、肺组织病变状况和肺组织胶原纤维生成情况。结果烟熏并感染组小鼠肺炎支原体感染率达到93%,肺泡腔塌陷,肺组织呈片状致密结构,内充斥大量红细胞,胶原纤维增多呈片状蓝染。结论通过实验可知烟熏并感染组小鼠肺内支原体浓度增高、肺组织病变情况严重,胶原纤维生成增多,预示慢性肺部炎症合并肺炎支原体间质性肺炎模型建立成功。     

支原体种属特异性PCR引物的设计及对细胞培养物支原体的检测

目的快速全面检测感染细胞、疫苗等多种生物制品中的支原体.方法从多种支原体的16SrRNA核酸序列中选择了两段高度保守的核酸序列,作为支原体种属特异性引物,对标本进行检测.结果用这对种属特异性引物对已知阳性的50份标本进行检测,检测结果显示全部为阳性.应用于实践,检测了89份疫苗标本,阳性率为31.4%,而用常规培养法检测阳性率为12.3%.结论用该种属特异性引物检测支原体具有检测速度快、检测灵敏度高、特异性强等优点.     

Variable Selection and Biomarker Correlation in the Analysis of Mycoplasma pneumoniae Strains by Surface-Enhanced Raman Spectroscopy

Mycoplasma pneumoniae is a human respiratory tract pathogen causing chronic bronchitis and atypical or “walking” pneumonia. The major surface protein P1 must form complexes with proteins P30 and P40/P90 to function in receptor binding and gliding motility, and variability in P1 and P40/P90 distinguishes the two major M. pneumoniae genotypes. Strains belonging to each genotype can be differentiated with high sensitivity and specificity by utilizing surface-enhanced Raman spectroscopy on silver nanorod arrays. Here, we used the variable selection method of variable importance in projection (VIP) to identify Raman bands important in M. pneumoniae strain classification. Furthermore, VIP analysis of mutants lacking P40/P90, or P1 and P40/P90, correlated certain Raman bands important in distinguishing genotypes, with specific mycoplasma surface protein composition and presentation. Variable selection, and its correlation with specific mycoplasma surface components, is an important next step in developing this platform for M. pneumoniae detection and genotyping.     

壮观放线菌素(Actinospectacin)的研究——Ⅳ 壮观放线菌素粉针剂试制及其对猪、鸡枝原体病的防治

内蒙古大学选育的壮观链霉菌(Streptomycecs spectabilis)UV 315的形态变异株LUV—80—2产生的碱性水溶性抗菌素,经中国医学科学院药物研究所鉴定,其理化性质与美国Upjohn公司制造的Actinospectacin(商品名为Trobicin)相一致。试制的粉针剂,经内蒙古自治区卫生局药品检验所检验,符合美国药典19版规定的壮观放线菌素粉针剂的各项标准。北京大学生物系应用内蒙古大学生物系生产的壮观放线菌素治疗实验性鸡枝原体病,表明具有一定疗效。和对照组比较,治疗组的增重率,饲料报酬率高,枝原体检出率和全血平板凝集反应阳性率低,气囊的损伤程度也较低。内蒙古畜牧科学研究所第一次应用壮观放线菌素粉针剂治疗猪喘气病,疗程8天,日治疗量1克,一次肌注,主攻疗程和巩固疗程的有效率均为100％。疗效显著,优于土霉素。     

PCR技术检测泌尿生殖道生殖支原体(MG)感染的研究

目的采用PCR检验技术,对吉林地区部分非淋菌性尿道(宫颈)炎(NGU)高危人群泌尿生殖道分泌物标本进行分离鉴定,以探讨MG感染在STD的作用和地位.方法吉林地区NGU高危人群受检者141例,宫颈或尿道口内拭子分泌物标本用PCR技术进行DNA扩增,并与对照组65例进行比较,结果141例标本MG-DNA扩增出26例,阳性率为18.4%,正常对照组65例MG-DNA扩增出3例,阳性率为4.62%(3/65),差异显著(x2=5.933,P=0.014 9＜0.05).结论1)吉林地区STD高危人群有较高的MG感染率,是NGU的病因之一2)PCR技术具有敏感、快速、特异性强特点,可以用来研究MG感染现状,流行情况及致病机制.     

两种肺支原体培养基质量的比较

对常用的国产培养基与进口的培养基进行了初步的质量比较实验。结果表明 :国产培养基与进口的培养基质量两者无显著差别。定性实验中 ,半流体培养基灵敏度均达到 10 - 7稀释度 ;液体培养基灵敏度均达到 10 - 9稀释度 ;定量实验中 ,两者测定同一样品的活菌数 ,国产培养基的结果为 8 5× 10 8CFU ml;国外培养基为 1× 10 9CFU ml。两种培养基用于支原体保存时 ,在 - 2 0℃条件下 2个月下降 1个对数级 ,但 6个月以上时 ,支原体活性很快下降。肺支原体在进口培养基上的发育状态优于国产培养基。