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1.
副猪嗜血杆菌血清型4液体发酵培养试验研究 总被引：1，自引：0，他引：1
为了研究适合副猪嗜血杆菌血清型4的液体发酵培养使用条件,试验测定了副猪嗜血杆菌血清型4在不同发酵条件下的OD600值。结果表明:最适培养条件为TSB培养基、100 mL/250 mL的装液量和0.004%烟酰胺腺嘌呤二核苷酸(NAD)浓度,培养24小时时菌体生长OD600值达到最大,同时产生大量的酸,pH值降至最低。当OD600值小于1时,测得的副猪嗜血杆菌活菌数和OD600值呈良好的线性关系;OD600值越大,偏离的趋势越明显。 相似文献
2.
为筛选副猪嗜血杆菌最适培养基,将副猪嗜血杆菌血清5型标准株（Nagasaki菌株）接种固体培养基TSA、PPLO琼脂、巧克力琼脂、胰月示蛋白胨琼脂和液体培养基TSB、PPLO液体、胰月示蛋白胨和马丁肉汤,通过观察菌落大小和平板计数,筛选出副猪嗜血杆菌生长最适培养基。将Nagasaki菌株接种TSB培养基,取10h～16h不同培养阶段的培养物,腹腔接种豚鼠,确定副猪嗜血杆菌感染实验动物的最佳培养阶段。结果表明,TSA和TSB是副猪嗜血杆菌的最适培养基,副猪嗜血杆菌血清5型接种于TSB中,在37℃、200r／min培养10h～13h,菌数可达到10^9cfu／mL。 相似文献
3.
《中国动物传染病学报》2019,(5)
上海市某猪场中分离出1株13型副猪嗜血杆菌,动物试验鉴定其为强毒株。为探索血清13型副猪嗜血杆菌的培养特性,以期提高其分离率并优化后续发酵条件,本研究对13型副猪嗜血杆菌生长所需要的血清和烟酰胺腺嘌呤二核苷酸(NAD)的浓度进行了筛选,测定了在最适培养条件下的生长曲线。结果表明,副猪嗜血杆菌在TSB培养基中的最适培养条件为5%新生牛血清,10μg/mL NAD;在最适培养条件下生长曲线显示,OD600值为0.2～0.6时为13型副猪嗜血杆菌的对数生长期,在培养14 h时活菌数达到最大值,而OD600值在22 h时达到最大,且在增值过程中产生大量的酸。 相似文献
4.
试验通过对适合副猪嗜血杆菌生长的4种固体培养基（巧克力琼脂、1%NAD巧克力琼脂、胰蛋白胨大豆琼脂和1%NAD胰蛋白胨大豆琼脂）筛选,采用分光光度计即时测定细菌数量,并以Bliss-LD50软件计算副猪嗜血杆菌（Haemophilus parasuis,HPS）对昆明小鼠的半数致死量。结果HPS在0.1%NAD的巧克力琼脂培养基生长最佳,以16～18h对数生长期细菌OD600值计算活菌量较准,HPS对昆明小鼠LD50为3.4291×109。 相似文献
5.
6.
副猪嗜血杆菌的药敏试验 总被引：1，自引：0，他引：1
本试验根据某养猪场发生的感染病情,疑似副猪嗜血杆菌感染猪出现厌食、呼吸困难、体温升高、振颤及共济失调,属于典型的副猪嗜血杆菌病临床症状。从疑似副猪嗜血杆菌感染猪的脾、肺等处取样,对致病菌进行分离、保存,一共获得10株疑似副猪嗜血杆菌,编号HPS-0~HPS-9。通过试验鉴定,这10株细菌均为副猪嗜血杆菌。选取其中三株副猪嗜血杆菌,编号为HPS-0,HPS-1和HPS-2,分别对18种抗感染药物进行药物敏感性试验,然后测定抑菌圈的直径判断药物对副猪嗜血杆菌的敏感度。试验结果显示,副猪嗜血杆菌对头孢菌素类抗生素最为敏感,其他大部分抗生素耐药现象比头孢菌素类严重。 相似文献
7.
对植物乳杆菌(Lactobacillus plantarum)8-6产细菌素的发酵条件进行了优化,分别研究了培养时间、温度、接种量、培养基起始pH值、培养基碳源、氮源等因素对细菌素产生的影响,通过单因素水平试验和正交试验,确定产细菌素的最佳培养基组合和最佳发酵条件为葡萄糖3%,胰蛋白胨2%,蛋白胨1%,酵母膏1%,硫酸镁0.058%,吐温-80 0.2%,30℃培养24h,培养基起始pH值为6.5,接种量2%。乳杆菌8-6优化后效价为1825.56IU/mL,比优化前提高了373.15%。 相似文献
8.
旨在对副猪嗜血杆菌HS1712冻干保护剂进行优化，提高菌株在冷冻干燥后的存活率。以冻干存活率为评价指标，对配方中甘油、海藻糖、甘露醇、聚乙烯吡咯烷酮(PVP)、牛血清白蛋白(BSA)等5种成分缺失，考察其对副猪嗜血杆菌冻干存活率的影响。在此基础之上，结合单因素变量试验，应用Box-Behnken响应面法对脱脂奶粉、甘油、海藻糖的添加比例进一步优化。结果表明，配方中甘油、海藻糖缺失后，副猪嗜血杆菌冻干存活率显著下降(P<0.05)。通过对Box-Behnken试验结果进行回归模型拟合，得到最佳添加比例为脱脂奶粉6.8%、甘油2.2%、海藻糖2.7%,具体配方成分及添加比例为脱脂奶粉6.8%、甘油2.2%、海藻糖2.7%、PVP 0.5%。使用优化后配方进行冻干验证，副猪嗜血杆菌HS1712平均冻干存活率为79.20%,与预测值(80.87%)无显著性差异(P>0.05),表示模型可靠。上述结果表明，优化后的冻干保护剂可显著提高副猪嗜血杆菌HS1712冷冻干燥后的存活率。 相似文献
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10.
《中国兽医杂志》2019,(9)
为了解镇江地区副猪嗜血杆菌血清型流行情况与耐药性情况,本试验采集患病仔猪的肺脏、肝脏、关节渗出液等病料组织85份,采用细菌分离、形态学观察、培养特征鉴定、PCR鉴定等方法对副猪嗜血杆菌进行鉴定,采用PCR法和K-B药敏纸片法分别检测副猪嗜血杆菌血清型及耐药性。结果显示,从85份病料组织中分离得到48株副猪嗜血杆菌;48株副猪嗜血杆菌具有7种血清型,其中,血清5型和12型为流行的主要优势血清型,分别占分离菌株的25.0%和31.3%; 48株副猪嗜血杆菌对磺胺间甲氧嘧啶、阿莫西林、庆大霉素等9种药物耐药率在50.0%～100.0%之间,对其他药物耐药率在12.5%～25.0%之间。说明该地区分离的副猪嗜血杆菌血清型流行情况复杂,且耐药性严重。本试验为该地区的副猪嗜血杆菌防控提供研究基础。 相似文献
11.
试验选用96头平均体重14.82 kg左右的杜×长×大断奶仔猪,随机分成4组,每组3栏,每栏8头(公母各半)。对照组饲喂基础日粮,试验1、2、3组分别添加1%80目白术、0.2%白术多糖和1%微米白术。试验期30 d。结果表明:在生长性能方面,与对照组相比,1%微米白术添加组可显著提高日增重(P0.05)、降低饲料增重比和腹泻率,而且效果优于1%80目白术组和0.2%白术多糖组,在肠道形态和肠道微生态区系方面,与对照组相比,日粮添加1%80目白术、0.2%白术多糖、1%微米白术均可不同程度的提高十二指肠和空肠的绒毛高度,加深十二指肠和空肠的隐窝深度,并且增加肠道微生态区系的多样性,其中以1%微米白术添加组的效果最佳。 相似文献
12.
Sissay, M.M., Uggla, A. and Waller, P.J., XXXX. Prevalence and seasonal incidence of nematode parasites and fluke infections
of sheep and goats in eastern Ethiopia. Tropical Animal Health and Production, XXXX. A 2-year abattoir survey was carried out to determine the prevalence, abundance and seasonal incidence of gastro-intestinal
(GI) nematodes and trematodes (flukes) of sheep and goats in the semi-arid zone of eastern Ethiopia. During May 2003 to April
2005, viscera including liver, lungs and GI tracts were collected from 655 sheep and 632 goats slaughtered at 4 abattoirs
located in the towns of Haramaya, Harar, Dire Dawa and Jijiga in eastern Ethiopia. All animals were raised in the farming
areas located within the community boundaries for each town. Collected materials were transported within 24 h to the parasitology
laboratory of Haramaya University for immediate processing. Thirteen species belonging to 9 genera of GI nematodes (Haemonchus contortus, Trichostrongylus axei, T. colubriformis, T. vitrinus, Nematodirus filicollis, N. spathiger, Oesophagostomum
columbianum, O. venulosum, Strongyloides papillosus, Bunostomum trigonocephalum, Trichuris ovis, Cooperia curticei and Chabertia ovina), and 4 species belonging to 3 genera of trematodes (Fasciola hepatica, F. gigantica, Paramphistomum {Calicohoron} microbothrium and Dicrocoelium dendriticum) were recorded in both sheep and goats. All animals in this investigation were infected with multiple species to varying
degrees. The mean burdens of adult nematodes were generally moderate in both sheep and goats and showed patterns of seasonal
abundance that corresponded with the bi-modal annual rainfall pattern, with highest burdens around the middle of the rainy
season. In both sheep and goats there were significant differences in the mean worm burdens and abundance of the different
nematode species between the four geographic locations, with worm burdens in the Haramaya and Harar areas greater than those
observed in the Dire Dawa and Jijiga locations. Similar seasonal variations were also observed in the prevalence of flukes.
But there were no significant differences in the prevalence of each fluke species between the four locations. Overall, the
results showed that Haemonchus, Trichostrongylus, Nematodirus, Oesophagostomum, Fasciola and Paramphistomum species were the most abundant helminth parasites of sheep and goats in eastern Ethiopia. 相似文献
13.
Tropical Animal Health and Production - 相似文献
14.
Rassnick KM Gieger TL Williams LE Ruslander DM Northrup NC Kristal O Myers NC Moore AS 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2001,15(3):196-199
1-(2-Chloroethyl)3-cyclohexyl-1-nitrosourea (CCNU) is an alkylating agent in the nitrosourea subclass. A prospective evaluation of CCNU was done to determine the maximally tolerated dosage of CCNU in tumor-bearing cats. Response data were obtained when available. Twenty-five cats were treated with CCNU at a dosage of 50-60 mg/m3 body surface area. Complete hematologic data were available for 13 cats. Neutropenia was the acute dose-limiting toxicity. The median neutrophil count at the nadir was 1,000 cells/microL (mean, 2,433 cells/microL; range, 0-9,694 cells/microL). The time of neutrophil nadir was variable, occurring 7-28 days after treatment, and counts sometimes did not return to normal for up to 14 days after the nadir. Based on these findings, a 6-week dosing interval and weekly hematologic monitoring after the 1st treatment with CCNU are recommended. The nadir of the platelet count may occur 14-21 days after treatment. The median platelet count at the nadir was 43,500 cells/microL. No gastrointestinal, renal, or hepatic toxicities were observed after a single CCNU treatment, and additional studies to evaluate the potential for cumulative toxicity should be performed. Five cats with lymphoma and 1 cat with mast cell tumor had measurable responses to CCNU. Phase II studies to evaluate antitumor activity should be completed with a dosing regimen of 50-60 mg/m3 every 6 weeks. 相似文献
15.
H Hayashi T Yoshimura J Y Chen 《Comparative immunology, microbiology and infectious diseases》1985,8(2):73-87
Our particular attention in this article was given to natural mediators for macrophages isolated from the sites of tissue injury. A number of chemotactic factors, which may satisfy many criteria making them acceptable as inflammatory leucocyte chemotactic factors, has been separated. Among them, our laboratory has isolated three macrophage (monocyte) chemotactic factors (MCF-a, -b and -c). Their purification, characterization and functional specificity are discussed. 相似文献
16.
Davis MS Willard MD Nelson SL Mandsager RE McKiernan BS Mansell JK Lehenbauer TW 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2003,17(3):311-314
Human and equine athletes are reported to have a high prevalence of gastric disease, and anecdotal evidence suggests a similar phenomenon applies to racing sled dogs. To investigate the prevalence of gastric disease in racing sled dogs, we conducted 2 gastroscopy studies on dogs competing in the annual Iditarod Sled Dog Race. A pilot study of dogs that were either dropped from the 2000 Iditarod Sled Dog Race because of illness or that finished the race indicated that, approximately 5 days after competing, 10 of 28 dogs (35%) had endoscopic evidence of gastric ulceration, erosion, or hemorrhage. The next year, an endoscopic study of 73 dogs participating in the 2001 Iditarod race was performed in order to evaluate a larger population of dogs. Data from 70 of these dogs could be used; 34 (48.5%) had ulceration, erosion, gastric hemorrhage, or some combination of these findings. When this group of 70 dogs was compared retrospectively to a control group of 87 dogs presented to the Texas A&M University (TAMU) Veterinary Medical Teaching Hospital, the Iditarod sled dogs had a significantly higher prevalence (P = .049) of gastric lesions. These findings suggest that, similar to athletes of other species, elite canine athletes have an increased prevalence of gastric disease compared to the canine population at large. 相似文献
17.
Furosemide continuous rate infusion in the horse: evaluation of enhanced efficacy and reduced side effects 总被引：1，自引：0，他引：1
Johansson AM Gardner SY Levine JF Papich MG LaFevers DH Fuquay LR Reagan VH Atkins CE 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2003,17(6):887-895
Continuous rate infusion (CRI) of furosemide in humans is considered superior to intermittent administration (IA). This study examined whether furosemide CRI, compared with IA, would increase diuretic efficacy with decreased fluid and electrolyte fluctuations and activation of the renin-angiotensin-aldosterone system (RAAS) in the horse. Five mares were used in a crossover-design study. During a 24-hour period, each horse received a total of 3 mg/kg furosemide by either CRI (0.12 mg/kg/h preceded by a loading dose of 0.12 mg/kg IV) or IA (1 mg/kg IV q8h). There was not a statistically significant difference in urine volume over 24 hours between methods; however, urine volume was significantly greater after CRI compared with IA during the first 8 hours ([median 25th percentile, 75th percentile]: 9.6 L [8.9, 14.4] for CRI versus 5.9 L [5.3, 6.0] for IA). CRI produced a more uniform urine flow, decreased fluctuations in plasma volume, and suppressed renal concentrating ability throughout the infusion period. Potassium, Ca, and Cl excretion was greater during CRI than IA (1,133 mmol [1.110, 1,229] versus 764 mmol [709, 904], 102.7 mmol [96.0, 117.2] versus 73.3 mmol [65.0, 73.5], and 1,776 mmol [1,657, 2.378] versus 1,596 mmol [1,457, 1,767], respectively). Elimination half-lives of furosemide were 1.35 and 0.47 hours for CRI and IA, respectively. The area under the excretion rate curve was 1,285.7 and 184.2 mL x mg/mL for CRI and IA, respectively. Furosemide CRI (0.12 mg/kg/h) for 8 hours, preceded by a loading dose (0.12 mg/kg), is recommended when profound diuresis is needed acutely in horses. 相似文献
18.
B. Cinar Kul N. Bilgen J.A. Lenstra O. Korkmaz Agaoglu B. Akyuz O. Ertugrul 《Zeitschrift für Tierzüchtung und Züchtungsbiologie》2015,132(6):449-453
Genetic variations in chromosome Y are enabling researchers to identify paternal lineages, which are informative for introgressions and migrations. In this study, the male‐specific region markers, sex‐determining region‐Y (SRY), amelogenin (AMELY) and zinc finger (ZFY) were analysed in seven Turkish native goat breeds, Angora, Kilis, Hair, Honaml?, Norduz, Gürcü and Abaza. A SNP in the ZFY gene defined a new haplotype Y2C. All domestic haplogroups originate from Capra aegagrus, while the finding of Y1A, Y1B, Y2A and Y2C in 32, 4, 126 and 2 Turkish domestic goats, respectively, appears to indicate a predomestic origin of the major haplotypes. The occurrence of four haplotypes in the Hair goat and, in contrast, a frequency of 96% of Y1A in the Kilis breed illustrate that Y‐chromosomal variants have a more breed‐dependent distribution than mitochondrial or autosomal DNA. This probably reflects male founder effects, but a role in adaptation cannot be excluded. 相似文献
19.
Ling GV Thurmond MC Choi YK Franti CE Ruby AL Johnson DL 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2003,17(6):817-823
The objective of this report was to characterize 20-year changes in proportion of calcium oxalate (CaOx) calculi and struvite calculi in dogs, and associations with breed, age, and sex. In this retrospective study, results of analysis of urinary calculi from dogs were reviewed for specimens received between July 1, 1981, and December 31, 2001. Breed, sex, age, year of submission of the specimen, and mineral type(s) were analyzed statistically. CaOx or Struvite or both were contained in 18,966 of 20,884 (91%) specimens. For both sexes, a 20-year statistically significant increase was observed in the proportion of calculus specimens that contained CaOx. The increase in this proportion was greater in females (1% to 31%) than in males (18% to 82%). From 1998 to 2001, when proportions may have plateaued, the odds of specimens containing CaOx were markedly higher in 18 breeds, markedly lower in 5 breeds, and not significantly different in 13 breeds compared with crossbreds. For both sexes, a 20-year statistically significant decrease was observed in the proportion of calculus specimens that contained struvite. This decrease in proportion was greater for males (79-16%) than for females (97-68%). From 1998 to 2001, when proportions plateaued, the odds of calculi containing struvite were markedly lower in 20 breeds, markedly higher in 1 breed, and not significantly different in 15 breeds when compared with crossbreds. Breed, age, and sex were associated statistically with CaOx or struvite urolithiasis. In conclusion, there appears to have been a long-term increase in the proportion of specimens of canine urinary calculi that contain CaOx as well as a long-term decrease in the proportion of specimens of calculi that contain struvite for both male and female dogs. The rate of change appeared to begin leveling off in the period 1998 to 2001. The recent proportion of dogs with either CaOx- or struvite-associated urolithiasis may depend on breed, age, and sex, and on interactions among these 3 factors. 相似文献
20.
<正>1.INTRODUCTION Ensuring transportation network security is one Of the most daunting challenges confronting homeland security agencies today.Significant research has been dedicated.To model and analyze the vulnerability of transportation systems,while notably fewer studies propose specific strategies for deploying defensive technologies to safeguard these systems. 相似文献