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| 1 | 半滑舌鳎源美人鱼发光杆菌的分离鉴定及致病性研究显示文摘探究引起半滑舌鳎(Cynoglossus semilaevis Gunther)发病死亡的原因及其病原菌的药敏特性,为生产中有效防治该病提供理论依据。于2018年从天津市某养殖场患病半滑舌鳎中分离得到3株优势菌,回归感染实验证实菌株PSC0601对半滑舌鳎具有致病性。通过肉眼观察可见半滑舌鳎腹腔严重肿胀,腹部两侧肌肉出血,解剖后可见半滑舌鳎肠道、肝脏等组织器官亦有大量出血。经API鉴定系统和16S rDNA序列分析鉴定该菌株为美人鱼发光杆菌美人鱼亚种(Photobacterium damselae subsp.damselae)。该菌在绵羊血平板上呈现β型溶血,人工回归感染实验结果显示该菌对半滑舌鳎的半数致死量(LD 50)为1.5×10^4 CFU/g。对48种抗菌药物的药敏实验结果表明,菌株PSC0601对氟苯尼考、氯霉素、阿莫西林、阿奇霉素、壮观霉素、头孢哌酮等20种药物具有较高敏感性。研究结果表明,美人鱼发光杆菌美人鱼亚种对半滑舌鳎具有较强致病性,可导致肝脏、肠道等器官发生出血性坏死,引发鱼类死亡。本文通过对该菌的药物敏感性进行研究,以期对鱼类养殖过程中由该菌引起的爆发性疾病提供药物防治理论依据。 | 邵蓬 武尊 雍朋政 赵重阳 许远飞 汤青平 汪笑宇 | 2020 | 中国海洋大学学报(自然科学版)2020，50，6： | 4 |
| 2 | Development of a Microfluidics-Based Quantitative Real-Time PCR to Rapidly Identify Photobacterium damselae subsp.damselae with Different Pathogenicity by Detecting the Presence of mcp or dly Gene显示文摘As a marine bacterial pathogen, Photobacterium damselae subsp. damselae(PDD) is distributed in seawater worldwide. It can infect different animals as well as humans, even cause deaths. The highly conserved regions of PDD mcp gene on chromosome and dly gene on plasmid were selected as the target fragments to design the specific primers. Recombinant plasmid standard was prepared based on the primers. With GENECHECKER UF-150 qRT-PCR instrument as the platform, a fluorescence-based quantitative real-time PCR(qRT-PCR) method was established for the detection of PDD. This method can specifically detect PDD and distinguish the highly virulent strains. Additionally, the test results can be qualitatively judged by visualization, while the quantitative detection can be achieved through the standard curve calculation. The minimum limit of detection was 1.0×101 copies μL-1, and the detection time was less than 20 min. In summary, this new method has outstanding advantages, such as strong specificity, high sensitivity, and low site requirements. It is a rapid on-site detection technology for highly virulent PDD strains. | ZHANG Zheng YU Yongxiang CHEN Jing WANG Yingeng JIANG Yong LIAO Meijie RONG Xiaojun ZHANG Hao | 2021 | Journal of Ocean University of China2021，20，2： | 0 |
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