为鉴定人工养殖的湘华鲮出现大量由急性肠炎引起死亡的病原,本研究取病鱼腹水和肠道粘液进行病原菌分离纯化,获得菌株XHL-03。经人工感染试验验证,人工感染的湘华鲮出现与自然发病相同的症状,初步确定其为该病致病菌株。经细菌形态学、...为鉴定人工养殖的湘华鲮出现大量由急性肠炎引起死亡的病原,本研究取病鱼腹水和肠道粘液进行病原菌分离纯化,获得菌株XHL-03。经人工感染试验验证,人工感染的湘华鲮出现与自然发病相同的症状,初步确定其为该病致病菌株。经细菌形态学、生理生化特征、16S r DNA序列分析及系统发育树聚类和血清凝集试验检测,结果显示致病菌株XHL-03为非O1/非O139型霍乱弧菌,其对诺氟沙星、头孢曲松、新霉素等10种药物高度敏感。病理切片显示,感染病原的湘华鲮肝胰脏细胞出现坏死,有急性胰腺炎和肠炎综合症状。本研究为湘华鲮霍乱弧菌引起的急性肠炎的临床诊断和防控提供参考依据。展开更多
Citrus tristeza virus （CTV）, the most devastating viral pathogen in citrus, causes tremendous economic losses to citrus industry worldwide. The CTV isolates exhibit variable pathogenicities on their hosts indicating...Citrus tristeza virus （CTV）, the most devastating viral pathogen in citrus, causes tremendous economic losses to citrus industry worldwide. The CTV isolates exhibit variable pathogenicities on their hosts indicating a mixed population of the CTV in nature. Several fragments within the CTV genome have been used for studying the genetic diversity of the CTV, however, the best region for rapid the CTV strain differentiation is still absent at present. In present study, a systemic analysis was carried out to evaluate the best region within the CTV genome for rapid CTV strain differentiation. Results of our study showed that the major coat protein （CP） coding region was the best region for this purpose. Using pair-wise distance frequency distribution plot, a reasonable genetic distance cut-off value was set for the CTV CP gene for the CTV strain differentiation. Using this criterion, eight CTV strains, including seven well characterized and a new strain, were successfully differentiated using 537 CTV isolates reported from 38 countries. The global strain distribution pattern was then determined and discussed. Our results also provided a new insight into the evolution and spreading of the virus, as well as the information for developing proper disease management strategy.展开更多
文摘为鉴定人工养殖的湘华鲮出现大量由急性肠炎引起死亡的病原,本研究取病鱼腹水和肠道粘液进行病原菌分离纯化,获得菌株XHL-03。经人工感染试验验证,人工感染的湘华鲮出现与自然发病相同的症状,初步确定其为该病致病菌株。经细菌形态学、生理生化特征、16S r DNA序列分析及系统发育树聚类和血清凝集试验检测,结果显示致病菌株XHL-03为非O1/非O139型霍乱弧菌,其对诺氟沙星、头孢曲松、新霉素等10种药物高度敏感。病理切片显示,感染病原的湘华鲮肝胰脏细胞出现坏死,有急性胰腺炎和肠炎综合症状。本研究为湘华鲮霍乱弧菌引起的急性肠炎的临床诊断和防控提供参考依据。
基金Supported by the National Natural Science Foundation of China (31101417 31101415)+1 种基金Zhejiang Provincial Natural Science Foundation of China (Y3110175 Y3110277)
文摘Citrus tristeza virus （CTV）, the most devastating viral pathogen in citrus, causes tremendous economic losses to citrus industry worldwide. The CTV isolates exhibit variable pathogenicities on their hosts indicating a mixed population of the CTV in nature. Several fragments within the CTV genome have been used for studying the genetic diversity of the CTV, however, the best region for rapid the CTV strain differentiation is still absent at present. In present study, a systemic analysis was carried out to evaluate the best region within the CTV genome for rapid CTV strain differentiation. Results of our study showed that the major coat protein （CP） coding region was the best region for this purpose. Using pair-wise distance frequency distribution plot, a reasonable genetic distance cut-off value was set for the CTV CP gene for the CTV strain differentiation. Using this criterion, eight CTV strains, including seven well characterized and a new strain, were successfully differentiated using 537 CTV isolates reported from 38 countries. The global strain distribution pattern was then determined and discussed. Our results also provided a new insight into the evolution and spreading of the virus, as well as the information for developing proper disease management strategy.
文摘目的:探讨适形调强放疗联合顺铂为基础的化疗治疗≥5 cm非小细胞肺癌(NSCLC)的疗效及对生存质量和血清肿瘤标志物的影响。方法:选取2016年1月~2019年1月来我院就诊的60例NSCLC患者(肿瘤直径≥5 cm)。分组方法采用随机数字表法,分为对照组(适形调强放疗)和观察组(适形调强放疗联合顺铂为基础的化疗治疗),各30例。对比两组疗效、生存质量、1年生存率、血清肿瘤标志物和不良反应发生情况。结果:观察组治疗后的生存质量优于对照组(P<0.05)。观察组治疗后的总有效率为63.33%(19/30),高于对照组的36.67%(11/30)(P<0.05)。治疗后,两组神经元烯醇化酶(NSE)、糖类抗原199(CA199)、细胞角蛋白19片段(CYFRA21-1)较治疗前下降,且观察组低于对照组(P<0.05)。观察组的1年生存率66.67%高于对照组36.67%(P<0.05)。两组放射性肺炎、放射性食管炎的发生率组间对比无差异(P>0.05)。观察组的全身不良反应、血液毒性发生率高于对照组(P<0.05)。结论:适形调强放疗联合顺铂为基础的化疗治疗≥5 cm NSCLC患者,疗效较好,可有效控制疾病进展,提高患者生存率。
