Protective efficacy of a live attenuated Mycoplasma hyopneumoniae vaccine with an ISCOM-matrix adjuvant in pigs     

Qiyan Xiong  Yanna Wei  Zhixin Feng  Yuan Gan  Zhanjun Liu  Maojun Liu  Fangfang Bai  Guoqing Shao 《Veterinary journal (London, England : 1997)》2014,199(2):268-274

An attenuated Mycoplasma hyopneumoniae vaccine that requires intrathoracic administration is commercially available for use against mycoplasmal pneumonia in China. Given the limitations of such a route of administration, this study was undertaken to assess the capacity of an ISCOM-matrix adjuvant to enhance immunogenicity following intramuscular use. Immune responses in pigs following vaccination and subsequent intra-tracheal bacterial inoculation were examined using lymphocyte proliferation, serology and mucosal IgA in both nasal and saliva swabs.Vaccination induced clear lymphocyte proliferation, but only slight serum antibody responses although these were significantly increased following experimental infection. Mucosal IgA was not detected in either nasal or salivary secretions. Following bacterial challenge, animals vaccinated with the adjuvant-containing live vaccine exhibited less severe pulmonary lesions (median score 3.67) than unvaccinated pigs (median score 13.58). The degree of ciliary loss on the respiratory tract surface was reduced in vaccinated pigs compared with experimentally infected controls. The findings indicated that the adjuvant vaccine administered IM provided protection against experimentally induced mycoplasmal pneumonia and could have commercial potential.  相似文献   

5种细胞质雄性不育小麦败育过程中活性氧代谢保护酶的响应   总被引：1，自引：0，他引：1  

石晓艺  胡甘  蒙立颖  齐智  宋喜悦 《麦类作物学报》2014,34(12):1656-1660

为了解异质雄性不育小麦败育过程中活性氧代谢中几种保护酶的变化特点,以5种小麦雄性不育系U116A、Ju116A、Va116A、C6116A、K116A及其相应保持系116B为材料,分析了小麦雄性不育系在花药不同发育时期的过氧化物酶(POD)、过氧化氢酶(CAT)、超氧化物歧化酶(SOD)活性与保持系的差异。结果表明,不育花药的POD活性自单核早期后均比同一发育时期的可育花药高;自单核晚期开始,不育系CAT活性总体上呈下降趋势,而可育系则呈升高趋势;受试材料花药中SOD活性总体呈上升趋势,且不育系高于保持系。经差异分析,不育系U116A、Ju116A、Va116A、C6116A的败育关键期是单核晚期,而K116A的败育关键期则是单核晚期至二核期。以上结果说明,5种异质小麦雄性败育时期有所不同,并且雄性育性与POD、CAT和SOD活性密切相关。  相似文献   

Ochracenoids A and B,Guaiazulene-Based Analogues from Gorgonian Anthogorgia ochracea Collected from the South China Sea     

Juan-Juan Zheng  Chang-Lun Shao  Min Chen  Li-She Gan  Yu-Chun Fang  Xu-Hui Wang  Chang-Yun Wang 《Marine drugs》2014,12(3):1569-1579

Two new guaiazulene-based analogues, ochracenoids A (1) and B (2), along with four known analogues (3–6), were isolated from the gorgonian Anthogorgia ochracea collected from the South China Sea. The planar structures of the new compounds were elucidated by comprehensive spectroscopic data. The absolute configuration of 1 was determined as 3R by the comparison of TDDFT calculated electronic circular dichroism with its experimental spectrum. Compound 1 is a rare guaiazulene-based analogue possessing a unique C₁₆ skeleton. The possible generation process of 1 through an intermolecular one-carbon-transfer reaction was also discussed. Compound 2 was previously described as a presumed intermediate involved in the biogenesis of anthogorgienes A and I. Compound 3 exhibited antiproliferative effects on the embryo development of zebrafish Danio rerio.  相似文献   

Aaptamine Derivatives with Antifungal and Anti-HIV-1 Activities from the South China Sea Sponge Aaptos aaptos     

Hao-Bing Yu  Fan Yang  Fan Sun  Jing Li  Wei-Hua Jiao  Jian-Hong Gan  Wen-Zhen Hu  Hou-Wen Lin 《Marine drugs》2014,12(12):6003-6013

Five new alkaloids of aaptamine family, compounds (1–5) and three known derivatives (6–8), have been isolated from the South China Sea sponge Aaptos aaptos. The structures of all compounds were unambiguously elucidated by spectroscopic analyses, as well as by comparison with the literature data. Compounds 1–2 are characterized with triazapyrene lactam skeleton, whereas compounds 4–5 share an imidazole-fused aaptamine moiety. These compounds were evaluated in antifungal and anti-HIV-1 assays. Compounds 3, 7, and 8 showed antifungal activity against six fungi, with MIC values in the range of 4 to 64 μg/mL. Compounds 7–8 exhibited anti-HIV-1 activity, with inhibitory rates of 88.0% and 72.3%, respectively, at a concentration of 10 μM.  相似文献   

Synthesis and Evaluation of Some New Aza-B-homocholestane Derivatives as Anticancer Agents     

Yanmin Huang  Jianguo Cui  Sijing Chen  Qifu Lin  Huacan Song  Chunfang Gan  Bin Su  Aimin Zhou 《Marine drugs》2014,12(4):1715-1731

Using analogues of some marine steroidal oximes as precursors, a series of aza-B-homocholestane derivatives possessing different substituted groups at the 3-position of the steroidal nucleus were synthesized. Their biological activity against cancer cell proliferation was determined with multiple cancer cell lines. Aza-B-homocholestane derivatives possessing 3-hydroxyl, 3-hydroximino and 3-thiosemicarbazone groups displayed remarkable cytotoxicity to cancer cells via apoptosis inducing mechanism. Compounds 5, 10, 12, 15 and 18 exhibited better potency to inhibit cancer cell proliferation. In addition, compound 15 was further evaluated with three dimensional (3D) multicellular spheroids assay to determine its potency against spheroid growth. The structure-activity relationship (SAR) generated in the studies is valuable for the design of novel chemotherapeutic agents.  相似文献   

基于北斗和GPS的双模田间作业机车定位系统     

辛德奎  黄操军  甘龙辉 《黑龙江八一农垦大学学报》2014,(1):85-87,112

为获取田间作业机车空间信息和运行信息,设计了一种基于北斗/GPS的双模定位系统。采用单片机对北斗/GPS双模接收机模块输出的数据进行解析,可以得到作业机车的位置、运行状态和作业状态等信息。上位机可以实时对车辆运行信息进行监控和储存,为实现田间机车智能化调度提供了可靠依据。  相似文献   

受限空间下散热对微火焰稳定性的影响     

甘云华  罗燕来  冯清颖  史艳玲 《农业机械学报》2014,45(4):37-41

以无水液体乙醇为燃料,用铁铬合金电热丝为燃烧室内反应物加热,采用实验与数值模拟相结合的方法研究乙醇-空气小尺度层流扩散火焰散热对受限空间微火焰稳定性的影响。结果表明,采用电热丝向受限空间内的燃烧反应物加热,可以减少散热损失的影响,对稳燃有一定的帮助。电加热功率为合适值时,稳定燃烧极限最宽。电加热可提高火焰温度,增大化学反应速率,使火焰中心向上游移动。一定范围内,电加热功率的增幅大于散热的增幅,外加热功率对散热损失有抑制作用,增强微火焰的稳定性。  相似文献   

基于过程本体的奶牛养殖业信息协同服务系统的建立   总被引：2，自引：0，他引：2  

徐勇  甘国辉  牛方曲  王志强  王健 《农业工程学报》2010,26(3):227-232

农业信息协同服务是农业信息化发展的重要方向之一,也是目前农业信息领域倍受关注的热点学术问题。该文将农业本体论思想引入农业生产经营过程,并以奶牛养殖业为例,探讨并划分了奶牛业生产经营过程阶段和对应的信息需求单元,构建了奶牛养殖过程本体和奶牛养殖业信息协同服务业务链模型,建立了基于业务链模型的奶牛养殖业信息协同服务系统,进而对系统的服务功能进行了初步实现。研究结果表明：建立在生物学特征基础上的农业过程本体在作为农业信息统一分类标准方面具有显著优势,基于过程本体的业务链模型有效地解决了农业信息资源优化调度和协同服务机制难题,实现了农业搜索服务和异构网站服务的协同。  相似文献   

圈养蓝鹇和白鹇繁殖行为的时间节律观察     

刘选珍  李洪文  毛杰  袁梨  甘静  刘芳 《野生动物》2013,34(1):25-28

采用瞬时取样法对圈养的2对蓝鹇和2组白鹇繁殖期行为的时间节律进行了初步研究,分别选择蓝鹇和白鹇繁殖行为较为明显的时期,各记录15 d,即蓝鹇为2008年3月30日～4月15日(12、13日因故未观察),白鹇为2008年4月16～30日;每天观察12 h,即从7:00～19:00。结果表明第一组蓝鹇和白鹇的繁殖行为都明显少于第二组蓝鹇和白鹇,蓝鹇和白鹇的繁殖行为的发生次数随日期出现波动,两物种繁殖行为的高峰多在早晚时段。蓝鹇和白鹇的产蛋周期分别为3～4 d和1～3 d;两物种雌性个体在产蛋前均有较多繁殖行为发生;两物种的繁殖对配对个体日间发情的同时性要求均不高,白鹇的繁殖与配对个体繁殖行为发生的绝对频次多少也无关,蓝鹇的繁殖与配对个体繁殖行为发生绝对频次多少的关系尚不明确。  相似文献   

法氏囊在鸡淋巴细胞性白血病发生发展中的作用   总被引：3，自引：1，他引：2  

罗国玲  甘永华  李学斌 《畜牧与兽医》1999,31(1):5-7

用鸡淋巴细胞性白血病病毒ＲＡＶ－１株接种３５只１日龄伊莎鸡雏，于接毒后不同批次扑杀，采取法氏囊做组织学、免疫细胞化学、透射电镜观察。结果：接毒后１个月，法氏囊滤泡髓质淋巴细胞开始转化，接毒后２～５个月更明显，在法氏囊滤泡髓质区形成成淋巴细胞克隆增殖灶。接毒后６个月，法氏囊萎缩。生物素－亲和素（ＢＡ）法染色表明法氏囊一直存有病毒和群特异性抗原，以接毒后３～４个月含量最高。电镜观察，在接毒后１～４个月的实验鸡法氏囊滤泡髓质淋巴细胞、巨噬细胞和网状细胞中观察到淋巴细胞性白血病（ＬＬ）病毒粒子。组织学、免疫细胞化学和电镜观察都表明法氏囊是该病的主要靶器官之一，法氏囊在鸡淋巴细胞性白血病的发生发展中起一定的作用  相似文献