采用甘油冷冻保存鸡大肠埃希氏菌病灭活疫苗生产用菌种的试验

鸡大肠埃希氏菌病灭活疫苗生产用一级种子按10%加入甘油混匀,分装于灭菌小瓶中,于-80℃条件保存1年,按菌种的标准进行各项特性鉴定,结果细菌的各项特性均符合<中华人民共和国兽用生物制品规程>的规定.     

几种生态制剂的生产菌种特性比较试验

几种生态制剂的生产菌种特性比较试验陈永林，关孚时，陈润清（中国兽药监察所北京，１０００８１）近年来，微生态制剂的应用逐步推广，用于生产制剂的菌种，特别是芽胞杆菌也在增加，芽胞杆菌属的细菌种类繁多，同种细菌各菌株之间也有差异。为弄清各菌种的特性，为菌种...     

牛巴氏杆菌病灭活疫苗生产菌种的保存期试验

对在２～８℃保存１０年以上，不同时期制备的牛源多杀性巴工杆菌生产用冻干菌种Ｃ４５－２、Ｃ４６－２、Ｃ４７－２各３批经培养繁殖，对菌种特性做了全面系统鉴定，结果各批菌种的各项特性均符合《中华人民共和国兽用生物制品规程》规定标准。     

鸡源芽孢杆菌的分离鉴定及小鼠毒性试验研究

本试验从鸡肠道分离出 42 株菌种,通过对菌种菌落培养特性、形态观察、生理生化试验,初步鉴定出 8 株为芽孢杆菌.用这 8 株菌对小白鼠进行为期 20 d 的正常量和加倍量的饲喂,结果表明,试验组小白鼠均未出现中毒现象,所选用的 8 株细菌均较安全,可作为动物微生态制剂的菌种应用.     

调痢生（Tiao Li Sheng）调整多种动物下痢的试验和应用

动物下痢尤其幼畜和雏禽下痢是一种常见病和多发病。其病原较复杂,除非特异性因子外,特异性病原如仔猪下痢有细菌、病毒、螺旋体和原虫等。本项试验目的是试图用我们研制的调痢生(又名8501)防治畜禽下痢。1985—1987年我们对调痢生进行了人工感染治疗、药物对比、批量应用以及制造调痢生菌种的形态、培养、生物学特性及毒性等试验。报道于后。一、菌种特性试验菌种系从健康动物体内分离的许多     

猪腹泻病料进行病原微生物的分离培养

对广东某一家猪场采集的病料进行病原微生物的分离培养,获得4株菌株。通过菌落和细菌形态学观察、生化试验进行细菌的分离鉴定。根据细菌的形态特征及生长特性,同时应用肠杆菌科GYZ-15e编码鉴定管和葡萄球菌属细菌生化编码鉴定管TH-16S对所分离的细菌进行分类鉴定,以鉴定其属和种。试验结果确定4株菌种中有大肠埃希氏菌3株,葡萄球菌1株。     

仔猪腹泻大肠杆菌菌种保存的研究

本文研究了4株仔猪腹泻大肠杆菌菌株不同代次培养的菌液,制成甘油菌后,保存在-20℃6个月,分析细菌的菌落形态、菌落特征、生化特性、血清血特性、毒力、免疫原性均符合《中华人民共和国兽药典》规定标准;4批冻干保存的菌种,经过36个月的保存后,分析细菌的菌落形态、菌落特征、生化特性、血清血特性、毒力、免疫原性均符合《中华人民共和国兽药典》规定标准。本文为大肠杆菌病的致病机理及疾病的潜伏期提供了理论依据。     

仔猪副伤寒活疫苗生产菌种的保存期试验

对不同年代冻干制备，在２￣８℃保存的３批猪霍乱沙门氏菌Ｃ５００弱毒菌株，依据１９９２年版《中华人民共和国兽用生物制品规程》进行了系统鉴定，结果表明Ｃ５００冻干菌种在２￣８℃保存３１年、１９年和１３年，菌种的各项特性均符合规程规定的标准。     

枯草芽孢杆菌的培养

细菌固体培养具有对设备条件要求低、耗能低、细菌繁殖量高的特点。枯草芽孢杆菌作为微生物饲料添加剂具有广泛的应用价值。本实验通过计数细菌的繁殖数量 ,探讨了最适于枯草芽孢杆菌生长的固体培养基的组成和收获时间。1　材料1 .1　菌种　枯草芽孢杆菌菌种购自中国普通微生物菌种保藏管理中心。1 .2　培养基　营养琼脂培养基、营养肉汤培养基、固体培养基 ,全都自行制做。2　方法2 .1　菌种培养　将芽孢杆菌菌种在无菌条件下接种于营养琼脂培养基斜面上 ,然后在恒温箱内 37℃培养 2 4 h,即可见到一层白色圆整、边缘光滑的枯草芽孢杆菌菌落…     

某奶牛场奶牛子宫内膜炎致病菌的分离鉴定

采集10头已确诊临床型奶牛子宫内膜炎患牛的子宫内容物,通过需氧和厌氧培养,根据细菌形态学及细菌生化特性进行分离鉴定。结果分离鉴定出3种27株细菌,分别为溶血性链球菌、非溶血性链球菌和大肠埃希菌。链球菌感染率为100%,溶血性链球菌感染率为70%,非溶血性链球菌感染率为30%。链球菌中,缺陷乏养球菌、毗邻乏养球菌和粪肠球菌所占比例较大。10份样品均分离到细菌,感染率为100%,其中绝大部分为多菌种混合感染。     

Long-chain fatty acids of Pasteurella multocida nad Pasteurella haemolytica

The relative contents of long-chain fatty acids in P. multocida and P. haemolytica were investigated. A dependence on the composition of the broth was established. Accordingly, comparative quantitative studies on fatty acid contents have to be conducted using bacteria grown with the same lot of broth medium. As for P. multocida, there were significant differences between the serovars (C14 in TDHM and C16, delta 2C18 in BPL). These differences are, however, not significant to replace serotyping. Highly significant differences were also detected between P. multocida isolates from nasal swabs and pneumonic lungs (interims of C14, delta C16 on BPL and BRU). The largest differences were measured for strains grown on BRU, which is interpreted as an expression of virulence. Significant differences were found between biotypes A and T of P. haemolytica, namely for C14, C16 in TDHM, and C14, delta C16, C16, C18 in BPL medium.     

Deoxyribonucleic acids from Pasteurella multocida and Pasteurella haemolytica]

Pasteurella multocida and P. haemolytica strains contain between 1.5 and three per cent phosphorus, between nine and 14 per cent nitrogen, between two and four per cent DNA, and between five and 18 per cent RNA, the precise figures depending on culturing conditions. High-molecular DNA may be isolated by means of bacteriolysis, using deoxycholate or dodecylsulphate and the usual steps of purification, with yield and purity differing by strains. DNA with sufficient purity can be obtained from Sepharose 2 B by gel chromatography. The isolated DNA yields were characterised, base values being between 37 and 38 per cent GC for P. haemolytica and between 41 and 48 per cent GC for P. multocida. Highly suitable precursors to DNA synthesis for tritium labelling are 3H-thymidine, which is incorporated in excess of 3H-thymine by a factor of 255, as well as 3H-uracil, with its activity being recovered also from the pyrimidine bases of DNA via pyrimidine biosynthesis.     

Investigation of outer membrane proteins of Pasteurella. 2: Iron-regulated outer membrane proteins of Pasteurella multocida and Pasteurella haemolytica

Pasteurella multocida and Pasteurella haemolytica produce specific proteins in the outer membrane under iron-depleted conditions. Pasteurella multocida serovar A expresses these proteins of molecular masses of 76 and 96 kDa as determined by electrophoresis. The analogous serovar D produces a further iron-regulated protein of 85 kDa. The Pasteurella haemolytica strains of serovar A1, A6 and T contain iron-regulated outer membrane proteins of molecular masses of 71, 77 and 100 kDa. These proteins possess binding positions for iron ions. Both Pasteurella multocida and Pasteurella haemolytica strains utilize iron from porcine and bovine transferrin, but not from haemin and haemoglobin.     

Incubation of Pasteurella haemolytica and Pasteurella multocida lipopolysaccharide with sheep lung surfactant

Lipopolysaccharides (LPS) were extracted from a serotype of each of 2 species of Pasteurella isolated from sheep with respiratory tract infections. Lipopolysaccharides from P haemolytica 82-25 (serotype 1A) or P multocida P-1573 (serotype 12) were mixed with sheep lung surfactant and were incubated for 6 hours at 37 C. After incubation, LPS-surfactant mixtures were centrifuged overnight in sucrose density gradients, and fractions were analyzed. Binding occurred between LPS and surfactant vesicles resulting in a stable complex with densities greater than those with the surfactant alone. The surfactant alone had a density of 1.052 to 1.060 g/ml. Diffuse bands of surfactant had a density of 1.075 to 1.092 when incubated with P haemolytica LPS and a density of 1.069 to 1.105 when incubated with P multocida LPS.