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1.
牛巴贝斯虫病是由巴贝斯属(Babesia)的多种寄生虫寄生于牛红细胞内所引起的血液原虫病。我国已报道的牛巴贝斯虫有3个种:双芽巴贝斯虫(B.bigemina)、牛巴贝斯虫(B.bovis)和卵形巴贝斯虫(B.ovata)。前2个种流行广泛,传播媒介为微小牛蜱和镰形扇头蜱,危害较大;后1个种只在河南局部地区发现,传播媒介为长角血蜱,危害较小。  相似文献   

2.
利用真核生物18S rRNA基因的PCR通用引物对寄生于中国水牛的巴贝斯虫(已命名为东方巴贝斯虫-BnbPsia orientalis)基因组DNA进行扩增,得到其18S rRNA全基因片段,测序后blast分析表明该虫种属巴贝斯虫无疑。将该基因1700bp长片段序列与GenBank中15种已知巴贝斯虫的相应序列进行比较分析,建立系统发育树。结果表明,东方巴贝斯虫与南非未定种的巴贝斯虫亲缘关系最近,与羊巴贝斯虫亲缘关系较近,与牛巴贝斯虫、双芽巴贝斯虫的亲缘关系较远。这一结果说明水牛东方巴贝斯虫是一独立种。  相似文献   

3.
旨在筛选出检测牛卵形巴贝斯虫特异、敏感的PCR方法。本试验以牛卵形巴贝斯虫18S rRNA、AMA-1和CCTη基因为靶基因进行PCR检测,从敏感性、特异性和临床检出率方面进行比较。结果显示,以18S rRNA基因的PCR方法敏感性最高,最小检出率为16 fg/μL;以CCTη为靶基因的PCR方法敏感性最低,检测量为1.6 pg/μL;而以顶膜抗原(AMA-1)为靶基因的PCR方法的最低检测量为160 fg/μL。三种靶基因均扩增不出牛瑟氏泰勒虫、牛巴贝斯虫和双芽巴贝斯虫基因片段。通过60份临床血液样本的检测结果表明,以18S rRNA基因设计引物的检出率最高,为30%(18/60),明显高于以AMA-1基因25%(15/60)和CCTη基因21.67%(13/60)。本试验为卵形巴贝斯虫病的诊断提供了更为敏感、特异的检测技术。  相似文献   

4.
利用蜱传播试验确定小亚璃眼蜱对中国新分离的牛的巴贝斯虫未定种和环形泰勒虫的传播能力与传播方式,进而明确其在中国牛梨形虫病传播中的流行病学意义。试验结果表明:小亚璃眼蜱可在雌虫阶段受到巴贝斯虫未定种的感染,并可在次代若虫(2/2)和成虫(3/3)阶段将病原传播给试验牛;小亚璃眼蜱幼虫和若虫吸入环形泰勒虫,饱血脱落的幼虫和若虫所蜕化发育的饥饿若虫(2/2)和成虫(2/2)均可将病原传递给敏感动物;感染巴贝斯虫未定种的小亚璃眼蜱饱血雌虫所孵育出的次代幼虫和若虫仍可被环形泰勒虫感染,所发育出的若虫(2/2)和成虫(2/2)可在一次传播试验中将环形泰勒虫和巴贝斯虫未定种同时传播给试验动物。  相似文献   

5.
用质粒PuN121从墨西哥虫株M建立牛巴贝斯梨形虫DNA的基因族,并克隆于大肠杆菌上,选择几个与标记的牛巴贝斯梨形虫基因DNA杂交的重组质粒,进一步分析,发现PMu—B_1敏感性较高,能检测出25pg纯净的牛巴贝斯梨形虫DNA。10μl感染全血中300个梨形虫或0.00025%虫血症,PMu—B_1含有6.0kb牛巴贝斯梨形虫DNA插人物,该插人物不与双芽巴贝斯梨形虫、伊氏锥虫、恶性疟原虫、边缘边虫、微小牛蜱和奶牛DNA发生交叉反应,基因组DNA Southem印迹析,PMu—B_1能识别两种牛巴贝斯梨形虫地方株,即墨西哥虫株M和泰国TS_4株,因此,PMu—B_1探针可用于诊断牛和蜱巴贝斯梨形虫感染及识别牛巴贝斯梨形虫虫株。  相似文献   

6.
为了确定巴贝斯虫中国分离株的分类地位,对我国报道的7种巴贝斯虫11个地方分离株的COⅠ基因序列进行测定;并与GenBank中其他巴贝斯虫COⅠ和相应18SrRNA基因序列分别构建系统发生树,比较基于不同基因的分类结果。结果显示:11株巴贝斯虫的COⅠ基因大小在935~999bp,与18SrRNA基因比较,COⅠ基因序列含有较多的变异位点及简约信息位点;基于两个基因的系统发育树,对于牛巴贝斯虫的分类结果基本一致。但也存在如下差异:18SrRNA无法将泰勒虫与巴贝斯虫进行区分,而COⅠ基因可明显区分;羊巴贝斯虫新疆未定种的分类地位在基于COⅠ基因的分类中更具合理性。来源于COⅠ和18SrRNA的信息都说明我国莫氏巴贝斯虫的不同地方株间可能存在亚种关系。该研究为巴贝斯虫的分子分类提供了候选基因。  相似文献   

7.
<正>奶牛焦虫病也称作牛巴贝斯虫病,是由数种巴贝斯虫引起的一种需经硬蜱传播的牛的血液原虫病。牛巴贝斯虫的传播媒介是牛蜱。临床上常出现血红蛋白尿,故又  相似文献   

8.
为了解卵形巴贝斯虫吉林株HSP70基因的结构及功能特性,采用PCR方法对其HSP70基因进行扩增测序及系统进化分析。结果:结构分析显示,卵形巴贝斯虫吉林株HSP70基因片段大小为1947 bp;测序结果显示,卵形巴贝斯虫吉林株HSP70基因与卵形巴贝斯虫日本株(XM_029011319)同源性为99.8%,与双芽巴贝斯虫同源性为95.12%,与牛巴贝斯虫同源性为86.72%;系统进化树分析表明,卵形巴贝斯虫吉林株与双芽巴贝斯虫亲缘关系较近,与牛巴贝斯虫及其他虫种亲缘关系较远。  相似文献   

9.
甘肃省部分牛羊血液原虫传播媒介的实验研究   总被引:4,自引:0,他引:4  
利用蜱传播试验,确定了甘肃省一些牛羊血液原虫的媒介和传播方式。甘肃省牛的双芽巴贝斯虫媒介为微小牛蜱。大巴贝斯虫媒介为长角血蜱。瑟氏泰 勒虫媒介为长角血蜱;绵羊无浆体的媒介为草原革蜱。微小牛蜱、长角血蜱可分别传播双芽巴贝斯虫和大巴贝斯虫,传播方式为经卵传递。将采集于甘肃文县牛体上的微小牛蜱和两当县的长角血蜱饱血雌虫孵育而来的次代幼虫分别叮咬除脾牛体后,2头牛各自感染双芽巴贝斯虫或大巴贝斯虫。将采自崇  相似文献   

10.
从日本牛体分离的卵形巴贝斯虫新种译者白启作者南,哲郎,石原忠雄除冲绳本岛而外,对从日本牛体分离的巴贝斯虫未定种作了鉴定。与双芽巴贝斯虫(Babesiabigemina)、牛巴贝斯虫(B.bovis)、分歧巴贝斯虫(B.divergens)和大巴贝斯虫...  相似文献   

11.
本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。  相似文献   

12.
用硝酸和高氯酸消化蜂蜜,使硒游离出来,在微酸性环境下,硒和2,3-二氨基萘(DAN)生成有较强荧光的物质,用环己烷萃取,在激发波长378nm,荧光波长518nm处测定其荧光强度。蜂蜜中硒含量范围:0.10~0.82μg/g。表明:蜂蜜应视为天然富硒营养品。  相似文献   

13.
乳酸杆菌益生作用机制的研究进展   总被引:2,自引:0,他引:2  
乳酸杆菌作为益生菌广泛用于人和动物。本文综述了乳酸杆菌改善宿主健康的机制。乳酸杆菌可通过产生抗菌物质如乳酸、过氧化氢、细菌素,或者通过竞争营养或肠道黏附位点来抑制致病菌;通过诱导黏附素的分泌或阻止细胞凋亡而增强肠道的屏障功能,从而保护肠道。文章重点讨论了乳酸杆菌表面成分(表面蛋白、脂磷壁酸和肽聚糖)与肠道受体(C型凝集素受体、Toll样受体和 Nod样受体),阐述了他们结合后启动免疫调节信号,调控肠道免疫功能以发挥改善健康作用的机制。  相似文献   

14.
以国际标准强毒R株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离MG,并收集感染鸡所产蛋分离MG。结果表明,人工感染48小时后上、下呼吸道及肺已被全面感染,96小时气囊已被感染,120小时输卵管已能分离到MG,卵巢始终分离不到MG。人工感染鸡自144小时便能在其所产蛋中分离出MG。药物治疗能在72小时内消除感染,油乳剂苗则需24天后逐渐降低蛋内MG分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内MG,但以研制的种蛋浸泡剂药浴效果为最好。  相似文献   

15.
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。  相似文献   

16.
Reasons for performing study: Clinical experiences indicate that centesis of the lateral compartment of the femorotibial joint is often unsuccessful. Objective: To determine the accuracy of 2 published and 2 unpublished techniques of centesis of the lateral compartment of the femorotibial joint. Hypothesis: It was hypothesised that a drug can be administered into the lateral compartment of the femorotibial joint via a diverticulum of this joint that surrounds the medial aspect of the long digital extensor tendon and that this technique is more accurate than described techniques of centesis of this compartment. Methods: Twenty‐four stifles of 12 horses were divided equally into 4 groups and a radiocontrast medium injected into the lateral compartment of the femorotibial joint of each group using a hypodermic needle inserted: 1) caudal to the lateral patellar ligament and proximal to the tibial plateau, 2) caudal to the long digital extensor tendon and proximal to the tibial plateau, 3) between the long digital extensor tendon and bone of the extensor groove of the tibia or 4) directly through the long digital extensor tendon until it contacted bone. Twelve veterinary students who had no experience using any of these techniques performed the injections. Accuracy of each technique was determined by examining radiographs obtained after injecting the contrast medium. Results: The most successful technique for arthrocentesis was by inserting a needle through the long digital extensor tendon. This approach was successful in all attempted cases, whilst other techniques had lower rates of success. Conclusions: The lateral compartment of the femorotibial joint can be accessed accurately by inserting a needle through the long digital extensor tendon as it lies within the extensor groove. Other techniques may not be as accurate for clinicians inexperienced in arthrocentesis of the lateral compartment of the femorotibial joint.  相似文献   

17.
本试验旨在研究两种绿头鸭(白羽绿头鸭和绿头鸭)肌肉营养组成和价值,为绿头鸭肉产品的开发利用提供基础数据和理论依据。选择白羽绿头鸭和绿头鸭60只(每个品种各30只,公母各半),依照国家标准测定胸肌粗蛋白质、粗脂肪、胆固醇含量及氨基酸、脂肪酸、微量元素和维生素的组成和含量,并对胸肌进行氨基酸评价及脂肪酸营养价值评价。结果显示,白羽绿头鸭肌肉粗蛋白质含量显著低于绿头鸭(P<0.05);两种绿头鸭肌肉中均检测到17种含量大于0.01%的氨基酸,其中白羽绿头鸭肌肉苏氨酸、组氨酸、丝氨酸和脯氨酸含量显著高于绿头鸭(P<0.05),赖氨酸、谷氨酸和精氨酸含量显著低于绿头鸭(P<0.05);检测到13种含量均大于0.01%的脂肪酸,其中白羽绿头鸭硬脂酸和油酸含量显著低于绿头鸭(P<0.05);检测到9种矿物质元素(钠、镁、钾、钙、锰、铁、铜、锌和硒),两种绿头鸭差异不显著(P>0.05);检测到8种维生素,白羽绿头鸭肌肉维生素B1含量显著高于绿头鸭(P<0.05),维生素D和维生素E含量显著低于绿头鸭(P<0.05)。两种绿头鸭肌肉氨基酸比例接近世卫组织推荐的理想模式,富含人体所需的矿物质元素和维生素,具有广阔的开发利用前景。  相似文献   

18.
This experiment was aimed to study the nutritional content and value of the muscles of two mallards (White feather mallard and mallard),and provide basic data and theoretical basis for the development and utilization of mallard meat products.60 White feathered mallards and mallards (30 for each breed,half of male and female) were chosen,and the composition and content of pectoral muscle crude protein,crude fat,cholesterol,amino acids,fatty acids,trace elements and vitamins were determined according to national standards and the nutritional values of muscle were evaluated.The results showed that the content of crude protein in muscle of White feather mallard was significantly lower than that of mallard (P<0.05).17 kinds of amino acids with contents higher than 0.01% were detected in the muscles of the two kinds of mallards,among which the contents of threonine,histidine,serine and proline in the muscles of the White feather mallard were significantly higher than those of mallard (P<0.05).The contents of lysine,glutamate and arginine were significantly lower than those of mallard (P<0.05).13 kinds of fatty acids with contents higher than 0.01% were detected,and the contents of stearic acid and oleic acid were significantly lower than those of the mallard.9 mineral elements (sodium,magnesium,potassium,calcium,manganese,iron,copper,zinc and selenium) in two kinds of mallards were detected,and there was no significant difference between the two kinds of mallards (P>0.05).8 kinds of vitamins were detected,and the content of vitamin B1 in muscle of White feather mallard was significantly higher than that of mallard (P<0.05),but the contents of vitamin D and vitamin E were significantly lower than that of mallard (P<0.05).The ratio of amino acids in muscle of two kinds of mallards was close to the ideal model recommended by WHO,which was rich in mineral elements and vitamins for human body,and had a broad prospect of development and utilization.  相似文献   

19.
应用光镜和透射电镜技术,观察了3~6月龄比格犬甲状腺的显微和超微结构。结果表明,比格犬甲状腺实质由滤泡和滤泡旁细胞构成。滤泡呈圆形或椭圆形,直径20.22~220.00μm,平均90.80μm;由单层立方上皮细胞围成,细胞高度3.04~7.11μm,平均5.18μm,电镜下可见功能状态不同的两型滤泡上皮细胞;滤泡旁细胞很多,直径4.40~8.82μm,平均6.23μm,位于滤泡之间或镶嵌于滤泡上皮细胞之间,也可聚集在一起形成滤泡样结构,胞质内含有大量的分泌颗粒,电镜下也可见两种类型的滤泡旁细胞。  相似文献   

20.
A retrospective review of records of 205 cats with histologically confirmed disease of the spinal cord was performed to identify the prevalence of disease in this nonrandomly selected population of cats. Clinical records were reviewed, and age, duration of neurologic illness, and clinical and histopathologic findings in cats with spinal cord disease were abstracted. Disease processes were classified into 7 categories and 23 groups. The most common diseases affecting the spinal cord of cats were feline infectious peritonitis (FIP), lymphosarcoma (LSA), and neoplasia of the vertebral column secondarily affecting the spinal cord. Information on age, onset and duration of clinical signs, and lesion localization at the postmortem examination in cats belonging to the 7 categories of disease were analyzed to create a practical list of differential diagnoses. Cats were also subcategorized into 3 groups based on their age at death. FIP was the most common disease of cats younger than 2 years of age. LSA and vertebral column neoplasia were the most common diseases affecting cats between 2 and 8 years of age. Vertebral column neoplasia was the most common disease affecting cats older than 8 years of age. Results of this histopathologic study showed that FIP and LSA were the most common disease processes affecting the spinal cord of cats. However, at least 21 other groups of diseases and their relative prevalence were identified.  相似文献   

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