致雏鹅痛风新型鹅星状病毒研究进展

近几年,我国江苏、安徽、山东、广东等主要养鹅地区鹅群发生了一种高度致死的关节型和内脏型痛风,发病鹅群感染率和死亡率最高分别可达80％和50％,给我国养鹅业造成了严重的经济损失[1-2].此次痛风发病鹅群主要为3周龄以内的雏鹅,典型临床症状为发病雏鹅由于关节肿胀而导致无法正常站立,典型病变为肝脏、脾脏和肾脏等内脏器官表面...     

白菌僵分生孢子用于粉纹夜蛾幼虫的生物测定

本文记述了一种生物测定方法,能有效的用来测定昆虫病原真菌—白僵菌分生孢子制剂Beauveia bassiana(Bals)vuill,对取食用不同浓度的分生孢子表面处理叶盘上的粉纹夜蛾Trichoplusia ni(Hubner)一龄幼虫的毒力。48小时后,幼虫转移到未处理的半合成饲料上(温度25±1℃),五天后终止测定。这种生物测定的剂量—死亡率回归方程是:Y=2.1420 1.3352X。计算得出的致死浓度Lc20、Lc50和Lc80分别为每平方毫米上总分生孢子数32,139和590个。     

高粱产量及其它数量性状的遗传

1977年雨季在印度 Indore 进行的两个播期、两种肥力的随机区组试验(二次重复)中,种植 CSV_3、555(易感粒霉病)、IS9327IS9333、IS9530(轻感)、2219B、SPV29(中抗)及其全部可能组合成的 F_1。从单行小区内选取5株记载50%开花期、株高、单株籽粒     

全球氮肥供应及需求展望（上）

影响氮肥消耗的主要因素有:人口增长、减少贫穷与改善营养不良的需要、农产品增长、人类饮食的变化、全球地区经济福利状况、耕地与水的可利用性以及有助于平衡、完善植物营养的政策。肥料的利用会被天气、种子发育、农业耕作实践及耕作体系、技术应用、农耕专业知识、环境管理     

Magnetic property of loess strata recorded by Kansu profile in Tianshan Mountains

Kansu (KS) profile is located in the east of Yili basin, western Xinjiang, where typical loess sediments are distributed. The magnetic parameters (such as IRM, SIRM SOFT, and M) and grain size in the KS profile were analyzed in the study. The results showed that the magnetic property of KS loess is dominated by ferrimagnetic minerals, such as magnetite and maghemite. Antiferromagnetic and superparamagnetic minerals also exist in the profile, but had less impact on magnetic susceptibility. Compared with the typical loess sediments of the central Loess Plateau in China, the strata of Kansu profile contained more magnetic minerals and hard magnetic minerals. The analysis of grain size for magnetic minerals indicated that the properties of loess and paleosol were respectively dominated by PSD/MD and coarse SSD magnetite. The research found that the contents of magnetic minerals in loess and paleosol sequences in Kansu profile were similar, but the proportion of fine grained magnetite and soft magnetic minerals were varying, which implies a positive relationship between the value of magnetic susceptibility and intensity of pedogenesis.     

二氟沙星肺靶向微球制剂的制备

以可生物降解的明胶为载体,液体石蜡为油相,Span-80为乳化剂,选择正交设计优化空白明胶微球生产工艺,并考察其理化性质,采用乳化交联法制备二氟沙星肺靶向明胶微球。采用紫外可见分光光度计法,测定微球中二氟沙星的含量。结果表明,优选所制的二氟沙星肺靶向明胶微球形态圆整,表面光滑,平均粒径为8.33μm,粒径分布在5.0～25.0μm的微球达到95.71%,二氟沙星明胶微球包封率为62.43%,载药量为13.71%。采用动态分析法研究体外释药特性,二氟沙星明胶微球在12h处药物释放量达到65%,24h内药物释放量达到71%。制备工艺稳定可行,所得二氟沙星明胶微球具有良好的缓释效果。     

Experimental Investigation on the Aseismic Behavior of Seismic Damage Masonry Wall Retrofitted with Grouting and Steel Hoops

In order to accurately evaluate the aseismic behavior of the seismic damaged masonry pagodas destroyed by Wenchuan earthquake and strengthened after the earthquake, a test was conducted to acquire related parameters on seismic performance from the specimens made by masonry and retrofitted with grouting and steel hoops. Taking a seismic damaged ancient masonry pagoda in Sichuan as a case study, four kinds of primitive specimens are fabricated by simulating the conformation of the masonry pagoda. Then the primitive specimens are destroyed under cycle loads and the damaged specimens are repaired by grouting and steel hoops. Cycle controlling tests are conducted with the specimens and relevant data are acquired. Experimental results showed that grouting combined with steel hoops could improve the ductility and energy dissipation capacity of a seismic damage of brick masonry structure, but it do a little to improve the stiffness of a seismic damage structure. And the cracking load of the repaired masonry is much lower than the original undamaged structure.     

蔬菜休闲观光新方式 品牌传播新平台——记北京世界园艺博览会之“百蔬园”

普通的蔬菜,登上世界园艺的舞台,传统的美食,带来精致的生活感受,设施农业的蔬菜主角,在融合中走出了新路径。2019年4月29日,北京世界园艺博览会(以下简称“世园会”)在万众期待中正式开园,拉开了162天盛展的大幕。由农业农村部规划设计研究院设施农业研究所策划设计的“百蔬园”也盛装亮相,以蔬菜全面替代其他景观元素,打造了集建筑、科技、生态、健康、景观、艺术、体验活动于一体的蔬菜历史演变大剧和生活场景,展示了“大蔬菜、大园艺”的独特魅力。     

冷应激对雏鹌鹑十二指肠肠道菌群的影响

为探索促进动物冷适应的方法,使动物在寒冷环境中能够保持正常生理机能,在建立雏鹌鹑急、慢性冷应激模型的基础上,应用变性凝胶电泳技术（ＰＣＲ-ＤＧＧＥ）,检测急、慢性冷应激对十二指肠组织肠道菌群的影响．结果表明,急、慢性冷应激均可以导致雏鹌鹑十二指肠内肠道微生物数量和种类的改变．冷应激会引起雏鹌鹑肠道生物屏障功能受损．     

补肾化癖方对PCOS大鼠卵巢颗粒细胞 CYP450表达的影响

〔摘要〕目的观察补肾化疲方对多囊卵巢综合征(PCOS)大鼠卵巢颗粒细胞CYP450蛋白表达的影响〔方法 运用补肾化疲方对PCOS模型大鼠进行干预后,采用免疫组化法观察卵巢颗粒细胞CYP450的蛋白表达〔结果模 型组与正常组比较,卵巢颗粒细胞CYP450的蛋白表达在表达面积及表达强度上均低于正常组,差异具有统计学 意义(P<0.01);补肾化疲方中、高、低剂量组及妈富降组用药后,卵巢颗粒细胞的CYP450的蛋白表达明显升高,差 异具有统计学意义(P<0.01, P<0.05);其中补肾化疲方中剂量对PCOS大鼠卵巢颗粒细胞CYP450的蛋白表达效果 最佳、结论补肾化疲方能增强PCOS大鼠卵巢颗粒细胞CYP450的蛋白表达,调节卵巢内分泌失调,改善PCOS高 雄血症.逆转卵泡的发育异常.使排卵成功、