用口蹄疫灭活苗稀释伪狂犬病、猪瘟活疫苗混合免疫效果评价

为综合评价疫苗混合免疫效果,采用猪口蹄疫OA二价灭活疫苗(Re-O/MAY98/JSCZ/2013株+Re-A/WH/09株)稀释伪狂犬病和猪瘟活疫苗,通过比较疫苗黏度、抗原含量,免疫前后口蹄疫、伪狂犬病和猪瘟抗体水平等方法进行效果评价。结果显示3种疫苗混合后对剂型、黏度、抗原含量无显著影响,混合免疫组与分别免疫对照组相比口蹄疫、伪狂犬病、猪瘟抗体均无差异,综合效果评价推荐采用混合免疫。     

中国专利情报视角下的中日RV减速机专利技术研究现状与发展态势对标研究

[目的/意义]以机器人核心关键技术RV减速机为切入点,系统、深入地剖析技术研发现状,梳理技术发展脉络,透视中国在该领域技术创新的现状和不足.[方法/过程]采用对标研究方法,围绕中日RV减速机专利技术发展历程、中日专利技术竞争者分析、专利技术研发布局、高价值专利、专利申请的法律状态等方面,对中国和日本的RV减速机技术研发...     

肉鸡腹水症和右心室扩张关系的研究

本试验研究表明,右心室重与心室重之比值可作为测量肉鸡右心扩张的可靠指标。并有助地肉鸡腹水症的诊断。腹水病肉鸡的右心扩张和肝脏肿大常并存,而心扩张肉鸡的右心扩张病变明显,而肝肿大病变高营养水平日粮、鸡舍内有害气体和药物应激引起右心扩张最终导致腹水症。     

Combining cover cropping with deficit irrigation in a Mediterranean low vigor vineyard

The aim of this research was to test the effects of vineyard soil management practices combined with deficit irrigation strategies on the performance of the grapevine (Vitisvinifera L.) red variety Tempranillo. Two soil management practices (soil tillage – ST and permanent resident vegetation – RV) were combined with three deficit irrigation treatments (regulated deficit irrigation – RDI, partial rootzone drying – PRD and conventional sustained deficit irrigation – DI) during two growing cycles. Compared to ST, RV reduced soil water content during spring, inducing a significant reduction in vine vegetative growth, yield and must titratable acidity. The effects of irrigation treatments were not much pronounced. Only in the second season RDI showed a significant reduction on vine vegetative growth, yield and must titratable acidity as compared to PRD and DI whose results were similar to one another.     

L-Arginine inhibiting pulmonary vascular remodelling is associated with promotion of apoptosis in pulmonary arterioles smooth muscle cells in broilers

Objective

Pulmonary vascular remodelling is one of the important pathological bases of broiler pulmonary hypertension syndrome (PHS). Nitric oxide (NO) has been found to inhibit proliferation and to induce apoptosis in pulmonary artery smooth muscle cells (SMC) in mammals with pulmonary hypertension. The present study was conducted to evaluate the effects of NO precursor l-arginine on pulmonary vascular remodelling in broilers with pulmonary hypertension induced by cold exposure and to examine whether NO-induced apoptosis in pulmonary arteriole SMC is involved in the regulatory mechanisms.

Methods

Two hundred and forty mixed-sex commercial broilers were equally assigned to three groups and reared in normal brooding temperatures before day 14. Starting on day 14 continuing until the end of the experiment, the control group was brooded in normal temperatures whereas the other two groups were subjected to low ambient temperatures with or without l-arginine added to the basal diets. Cumulative PHS mortality and body weight were recorded in each group. Right/total ventricle ratio (RV/TV), plasma NO concentration and pulmonary vascular morphological changes were analyzed. TdT-mediated dUTP-biotin nick-end labeling (TUNEL) assay was used to detect apoptosis in pulmonary arteriole SMC.

Result

l-Arginine, in group A, had no effect on body weights under cold temperature condition. Birds kept in group B had increased PHS mortality, RV/TV ratio, vessel wall area/vessel total area ratios (WA/TA) and mean media thickness in pulmonary arterioles (mMTPA) (P < 0.05). Percentages of apoptotic SMC in pulmonary arterioles in group B were not altered by cold exposure (P > 0.05). Supplemental dietary l-arginine in group A elevated plasma NO level (P < 0.05), reduced PHS mortality (P < 0.05), attenuated pulmonary vascular remodelling and increased the percentages of apoptotic SMC (P < 0.05) when compared with the group B.

Conclusion

Supplemental l-arginine partially inhibited pulmonary vascular remodelling that occurred secondary to increased pulmonary pressure; NO-induced apoptosis in arteriole SMC might contribute to its regulatory effect on pulmonary vascular structural changes.     

猪流行性腹泻、猪传染性胃肠炎和猪轮状病毒RT-PCR鉴别诊断技术研究

分别设计了三对引物对猪流行性腹泻病毒(PEDV)、猪传染性胃肠炎病毒(TGEV)和猪轮状病毒(RV)的RNA进行RT-PCR，结果其扩增产物的目的条带分别为：199bp、886bp、342bp，证明对引起猪病毒性腹泻的最主要的三种病毒用RT—PCR方法，可在3h作出内快速鉴别诊断。病毒间无交叉反应。     

狂犬病毒CVS株G基因和IFN-a基因共表达重组腺病毒载体的构建

通过RT-PCR方法扩增得到狂犬病毒G基因,PCR方法得到IFN-Αa基因并亚克隆入pIRES获得pIRES-a质粒.双酶切G基因和pIRES-a质粒并回收目的基因与腺病毒穿梭载体pAdTrack-CMV连接,再与pAdEasy-1质粒在BJ5183菌中同源重组产生腺病毒载体质粒.线性化后的重组腺病毒质粒转染人胚肾293细胞,通过观察报告基因绿色荧光蛋白的表达鉴定重组的腺病毒.结果表明:该重组病毒质粒经酶切鉴定与预期结果一致;转染293细胞后观察到绿色荧光蛋白的表达,说明成功构建了G和IFN-a双基因共表达重组腺病毒载体.     

多价荧光抗体监测外源病毒污染的研究

用猪瘟病毒（ＨＣＶ）、猪细小病毒（ＰＰＶ），牛病毒性腹泻／粘膜病病毒（ＢＶＤ／ＭＤＶ），伪狂犬病病毒（ＰｒＶ），兰舌病病毒（ＢｔＶ），羊口疮病毒（ＯＶ）等六种病毒，多次同时或先后强化免疫猪，制取六价高免血清；用狂犬病病毒（ＲＶ）免疫兔，制取ＲＶ单价高免血清，分别用异硫氰酸荧光素（ＦＩＴＣ）标记制成荧光抗体（ＦＡ），并按二者最佳染色价配制成七价（多价）ＦＡ。由于各病毒在其宿主细胞中复制部位和与宿主细     

槽式翻抛机RV减速器传动偏差理论分析

行星齿轮作为一级传动系统和二级系统摆线针轮共同组成RV减速机，在减速器整机装配过程中各零部件的偏差源通过偏差传递后的偏差值的大小直接影响着其传动精度。因此本文着重研究槽式翻抛机RV减速器在装配过程中偏差传递机理对其精度的影响，并基于蒙特卡洛法并研究和分析其偏差源及其偏差传递机理对RV-40E减速器及整机的装配偏差统计量进行求解，得出第2级传动偏差值对减速器整机偏差传递的影响最大的结论。对促进减速器的研究开发以及对我国有机肥翻抛系统的开发有着重要的工程实际意义。