新城疫La Sota、V4疫苗免疫鸡和免疫攻毒鸡的特异性IgA抗体动态变化规律比较

应用间接ELISA对新城疫LaSota、V4疫苗免疫鸡及免疫攻毒鸡的IgA抗体动态变化进行了测定和比较。试验表明，LaSota和V4免疫鸡泪液中特异性IgA均在免疫后第5天出现，8天开始明显升高，与血清中IgG出现时间相似，免疫后21天达到高峰。LaSota免疫鸡的泪液IgA抗体水平略高于V4免疫鸡；而两免疫组哈德氏腺(HG)中的特异性IgA高峰出现较迟。免疫攻毒鸡泪液中的特异性IgA抗体水平均先呈短暂的升高，之后下降的趋势，而HG中的IgA则首先表现降低，之后很快升高，5天后趋于下降，两攻毒组差异不显著，对IgA回忆应答均不明显。     

棕尾虹雉短角鸟虱新种描述（食毛目：短角鸟虱科,短角鸟虱属）

本文报道了从上海动物园棕尾虹雉（Lophophorusimpejanus）体上所采集的鸟虱,经鉴定后,该虫神为头角亚目（Amblycera）短角鸟虱科（Menoponidae）短角鸟虱属（Menopon）一新种,文内对其所具有的分类特征进行了描述,并绘图。     

Black yeast-like fungi associated with Lethargic Crab Disease (LCD) in the mangrove-land crab, Ucides cordatus (Ocypodidae)

Lethargic Crab Disease (LCD) caused extensive epizootic mortality of the mangrove land crab Ucides cordatus (Brachyura: Ocypodidae) along the Brazilian coast, mainly in the Northeastern region. The disease was named after the symptoms of slow movement of infected crabs. Causative agents were suspected to be two black yeast-like fungi of the family Herpotrichiellaceae (ascomycete order Chaetothyriales), judged by infected tissue biopsies from moribund U. cordatus. The aim of the present study is to prove that two species are involved in the disease: the recently described black yeast Exophiala cancerae, but also a less virulent, hitherto undescribed fonsecaea-like species, introduced here as the novel species Fonsecaea brasiliensis. Strains were identified by ITS rDNA sequencing, and species borderlines were established by multilocus sequencing and AFLP analysis. Fonsecaea brasiliensis proved to be closely related to the pathogenic species Cladophialophora devriesii which originally was isolated from a systemic infection in a human patient. The virulence of F. brasiliensis is lower than that of E. cancerae, as established by artificial inoculation of mangrove crabs.     

澳大利亚墨尔本WHO流感中心对南极洲企鹅的禽流感监测

2013年,澳大利亚墨尔本世界卫生组织流感参考和研究合作中心对南极企鹅开展了禽流感病毒监测。在270份企鹅血样中,检出34份禽流感抗体阳性,抗体阳性率为16%;对301份咽喉?泄殖腔拭子进行禽流感病原学检测,检出8份阳性,病原阳性率为2.5%,并成功分离到4株H11N2禽流感病毒。企鹅携带禽流感病毒这一事实,引发了全球共同抗击全球化动物疫情的思考。     

盐度对刺参消化酶活力的影响

本文应用酶学分析方法研究了盐度对刺参消化道内各种消化酶活力的影响.蛋白酶活力测定采用福林一酚法,脂肪酶活力测定采用水解法,淀粉酶活力和纤维素酶活力测定采用水杨酸显色法.试验结果表明,除脂肪酶外,盐度对消化道内消化酶活力具有显著影响(P＜0.05).淀粉酶和蛋白酶在盐度30时活力最大,而纤维素酶在盐度26时活力最大.     

浙东白鹅肉用性能测定

为研究浙东白鹅的种质特性和生产性能,笔者曾于2006年5月对浙东白鹅(10周龄未经肥育肉鹅)的屠宰性能、鹅肉的常规营养成分及肉质性状进行测定分析,现将结果报告如下。1材料与方法试验从浙东白鹅原种场随机选择10周龄未经肥育的浙东白鹅12只(公5只,母7只),空腹12h后按常规方法屠     

猪链球菌2型诊断与防制措施

<正>猪链球菌(Streptococcus suistype 2,SS2)已经成为危害养猪生产及人类健康的重要人畜共患病。可引起猪脑膜炎、关节炎、心内膜炎及猝死等;致人败血症、心内膜炎、脑膜炎,严重的致人链球菌毒素休克综合征而死亡。1998年7月江苏南通某地猪群暴发猪链球菌2型,同时导致21     

L-arginine prevents reduced expression of endothelial nitric oxide synthase (NOS) in pulmonary arterioles of broilers exposed to cool temperatures

This study investigated nitric oxide synthase (NOS) expression in the endothelium of pulmonary arterioles of broilers during the development of pulmonary hypertension syndrome (PHS). PHS was triggered by exposing broilers to sub-thermoneutral (cool) temperatures and an additional 1.0% L-arginine was added to the basal diet to evaluate the effects of supplemental L-arginine on nitric oxide (NO) production, endothelial NOS expression, and the incidence of PHS. Cumulative mortality from PHS, right/total ventricle weight ratios (RV/TV), and body weights were recorded. Plasma NO concentration and NOS expression in the endothelium of pulmonary arterioles with an outer diameter ranging from 100 to 200 microm were determined. Birds exposed to cool temperatures had increased pulmonary hypertension and PHS mortality and diminished endothelial NOS expression. Supplemental dietary L-arginine reduced PHS mortality and elicited higher NOS expression within the pulmonary endothelium coincident with elevated NO production. The results demonstrated that broilers developing PHS exhibited diminished NOS expression in the endothelium of their pulmonary arterioles. Supplemental L-arginine prevented the reduced expression of NOS in the pulmonary endothelium, which might contribute to the increased production of NO by the pulmonary vasculature.     

Inhibition of porcine circovirus type 1 and type 2 production in PK-15 cells by small interfering RNAs targeting the Rep gene

Porcine circovirus type 1 (PCV1) and type 2 (PCV2) are two genotypes of porcine circovirus. Both of them are presumed to be widespread in the swine population. Currently, there is no specific treatment for their infections. RNA interference (RNAi) is a sequence-specific RNA degradation mechanism mediated by small interfering RNA (siRNA), which represents a possible therapeutic application for the treatment of viral infections. In this study, three siRNA expression plasmids (pS-RepA, pS-RepB and pS-RepC) were generated to target three different coding regions of the Rep protein (Rep) of PCV. These siRNAs were used to inhibit PCV production in a porcine kidney cell line, PK-15 cells. Our results revealed that Rep gene expression was inhibited by pS-RepA, pS-RepB and pS-RepC to different degrees. Moreover, our study also showed that the production of PCV1 and PCV2 was reduced by these siRNAs. pS-RepC, which targets the middle region of Rep gene, proved to be the most efficient siRNA for inhibition of Rep expression and viral production. Taken together, our data suggest that RNAi could be investigated as a potential treatment for PCV infection.     

斗牛犬

斗牛犬起源于英国大不列颠群岛,由于该犬在当地常被用来进行“纵犬咬牛”游戏,而得此名。据传说,大约在1209年左右,英国斯坦福城堡围墙内,有两头公牛为了一头母牛在城堡内草地上争斗,直到所有牛屠宰完就剩下这头获胜公牛后,让屠夫们所养的犬去追捕这头公牛,这头公牛在犬吠叫声、人们噪杂声和众多的犬追逐中疯了,当地统治者威廉·厄尔·华伦感到很高兴,于是他让出那块围捕追逐的城堡草地,作为城中屠宰者的公共用地,进行“纵犬咬牛”游戏,此项游戏运动后来被永远地保留下来了。这种游戏虽然有点残忍,但通过这