共查询到20条相似文献,搜索用时 62 毫秒
1.
从广西不同猪场有神经症状的病猪脑分离到12株典型链球菌.采用链球菌乳胶凝集标准诊断试剂盒和ID 32 STREP链球菌生化试剂盒对分离株进行分群、生化特性鉴定,以及小白鼠的致病性试验、药敏试验等研究.结果表明:分离株有1株为C群,9株为D群,1株为D群但与G群有交叉反应,1株为未知群;生化反应特性不完全一致,有5株的生化特性差异性较大;12株菌均呈现β溶血;小白鼠对大部分分离株不敏感;分离株对氟苯尼考、阿莫西林、青霉素G敏感,对庆大霉素、氟派酸、卡那霉素完全耐药. 相似文献
2.
上海地区猪源链球菌分离株的病原特性鉴定 总被引:23,自引:2,他引:23
1997-1999年从上海地区分离出15株猪源链球菌,结合培养特性、生化特性及血清定型等对其进行了鉴定。其形态、染色及培养特性基本符合链球菌的特点,大多具有α或β溶血,生化试验结果不稳定。用国际通用的链球菌A-G乳胶分型诊断液和猪链球菌1、2型标准阳性血清检测5株分离菌,4株为C群链球菌,1株为2型猪链球菌,1株为B群链球菌,1株为D群链球菌,1株与A群和C群有交叉反应,7株不在其检测范围。小鼠对15株分离菌的敏感性有所不同。本试验表明,上海地区猪链球菌病的病原已不再是单一的C群链球菌。对新出现的2型猪链球菌,应引起足够重视。 相似文献
3.
4.
选取36家规模猪场疑似猪链球菌病猪的病料,进行细菌分离鉴定和生化试验,共分离到14株细菌,其中C群兽医链球菌8株,D群猪链球菌6株。药敏试验表明,药物最敏感的是替米考星、头孢氨苄、阿米卡星、头孢呋辛钠。 相似文献
5.
6.
选取36家规模猪场疑似猪链球菌病猪的病料,进行细菌分离鉴定和生化试验,共分离到14株细菌,其中C群兽医链球菌8株,D群猪链球菌6株。药敏试验表明,药物最敏感的是替米考星、头孢氨苄、阿米卡星、头孢呋辛钠。 相似文献
7.
8.
山西省猪链球菌的分离鉴定及药敏试验 总被引:1,自引:1,他引:1
对2007年来自山西省不同地区的疑似猪链球菌病病料进行分离鉴定,共分离到12株链球菌,对这12株链球菌进行了生化试验、兰氏分群A-G诊断试剂鉴定、动物试验和药敏试验.结果表明,其形态、染色、培养特性及理化特性符合链球菌的特点,大多具有α或β溶血,生化试验结果不稳定;山西省发生的猪链球菌病主要由F群(4/12)、C群(3/12)、D群(2/12)和G群(2/12)链球菌引起,其分布无明显地域性;动物致病性试验表明,12株分离株中,10株对小鼠有不同程度的致病作用;10株致病性菌株对氨苄西林、氟哌酸、四环素高度敏感. 相似文献
9.
本试验从北京地区四个规模化猪场的74头疑似猪链球菌病的仔猪组织中分离培养获得56株猪源链球菌,并进行了API 20 Strep生化鉴定、16S rRNA基因序列比对和药敏试验。试验结果表明:56株猪源链球菌分别属于粪肠球菌、屎肠球菌、鸟链球菌、马链球菌兽疫亚种、豕链球菌和猪链球菌,其中以兰氏D群粪肠球菌为主(23/56,41.07%),其次为兰氏C群马链球菌兽疫亚种(14/56,25.00%);对10种临床常用抗生素均产生了耐药性,耐药比例从12.50%至92.86%不等,对红霉素的耐药比例最高(52/56,92.86%),对新霉素的耐药比例最低(7/56,12.50%),且多重耐药性现象极为严峻。 相似文献
10.
11.
12.
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
13.
14.
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
15.
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
16.
17.
18.
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
19.
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