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鸭疫里默氏菌一个可能新型的鉴定 总被引:4,自引:0,他引:4
用玻片凝集试验、试管凝集试验和琼脂扩散沉淀试验,对13个鸭疫里默氏菌分离株进行了血清型鉴定。玻片凝集试验中,这些菌株只与8型抗血清发生强凝集反应,试管凝集试验中,其代表菌株C882与8型参考菌株之间仅存在单向低度交叉凝集反应,且与1~19型中的其他18个血清型参考菌株无可见的交叉凝集反应;用C882吸收可消除8型抗血清与C882等菌株之间的交叉凝集反应,但不影响8型抗血清的同源凝集反应和沉淀反应能力。琼扩试验中,C882与1~19型参考菌株之间不产生可见的交叉沉淀反应。沉淀反应模式表明,以C882为代表的13株细菌的热稳定抗原具有同一性。结果表明,13株待检菌株可能属于一个新的血清型。 相似文献
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1株难以定型的鸭疫里默氏菌分离株 总被引:6,自引:0,他引:6
采用未经过吸收和经过吸收的抗血清,通过凝集试验和沉淀试验对1999年从河北某鸭场分离到的1株鸭疫里默氏菌(编号为C515)进行了研究。玻片凝集试验可将C515鉴定为19型,试管凝集试验表明,C515与19型参考菌株只有单向低度交叉凝集反应;C515不在10型抗血清中凝集,但C515抗血清可与10型参考菌株发生凝集反应;交互吸收可消除C515与10型和19型之间的交叉凝集反应,但不影响同源凝集反应和同源沉淀反应。C515与1~19型中的其他17个型的参考菌株没有可见的凝集反应,c515与1~19型参考菌株均不产生可见的沉淀反应。单独比较c515与1~19型参考菌株的关系,可将它鉴定为不同于1~19型的血清型,但该菌株还与10型的4个亚型菌株存在不同程度的交叉反应,尤其与亚型4(代表菌株为C598)存在高度交叉凝集反应和清晰的交叉沉淀反应;若将C515定为10型的亚型,又不符合10型分离株的共性。因此,该菌株属于难以定型的一类,可将它暂时鉴定为C598菌株的一个变异株。 相似文献
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鸭疫里默氏菌的血清型及药物敏感性分析 总被引:1,自引:0,他引:1
为了解近期鸭疫里默氏菌的血清流行病学,明确鸭疫里默氏菌的敏感药物,本研究根据鸭疫里默氏菌的gyrB基因序列设计检测引物,建立PCR检测方法,并对收集的2006~2012年间福建省及邻近省份的疑似鸭疫里默氏菌病死亡鸭、鹅,进行细菌分离,PCR鉴定,凝集试验确定血清型,纸片法分析药物敏感性。该PCR法具有较好的特异性,检测敏感性可达102~103 CFU/mL。分离鉴定鸭疫里默氏菌423株,分属于1、2、3、6、10、11、13、14、17型和未知型,2型、11型、1型和17型合计占所有菌株数量的86.4%。50%以上分离菌株敏感的药物有氟苯尼考、头孢拉定、头孢氨苄、阿莫西林、头孢唑啉和壮观霉素。 相似文献
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对2008~2010年从云南宜良县鸭传染性浆膜炎病鸭中分离的鸭疫里默氏杆菌的血清型和抗药性进行了调查和分析。在89个鸭场中共分离鉴定出鸭疫里默氏杆菌67株。平板凝集试验结果表明血清1型菌株有61株,占分离株总数的91.04%,是宜良县鸭疫里默氏杆菌的优势血清型。以纸片法测定了所分离菌株对18种常用抗菌药物的敏感性,仅头孢噻吩、氟苯尼考和阿莫西林相对敏感,敏感菌株的比例分别为100%、82.90%和62.69%。此外,多重耐药现象严重。 相似文献
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魏静 《四川畜牧兽医学院学报》2009,(4):28-32
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
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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
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REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献
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Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 相似文献
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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