武汉市新洲区2021年高致病性禽流感和新城疫免疫抗体监测数据浅析     

叶汉珍  程新旺  王巧娜 《畜牧兽医杂志》2023,(2):112-114

高致病性禽流感（highly pathogenic avian influenza, HPAI）和新城疫（newcastle disease, ND）等烈性传染病对养禽业危害严重,是养禽业需重点防控的疾病,其中HPAI是国家规定的强制免疫疫病。武汉市新洲区为家禽养殖大区,有规模禽场350余家,养殖规模近1140万只。为了解2021年度武汉市新洲区规模养殖场高致病性禽流感和新城疫免疫抗体合格率,武汉市新洲区农业技术推广服务中心连续12个月对辖区内规模鸡场进行蛋样抽检,运用血凝和血凝抑制试验,分别检测了高致病性禽流感H5亚型、H7亚型和新城疫的免疫抗体。结果显示,高致病性禽流感H5亚型、H7亚型和新城疫的整体免疫抗体合格率分别为94.1%、96.4%和88.9%,均达到了农业农村部规定的免疫抗体合格率不低于70.0%的标准。  相似文献   

不同牛粪配比基质对盆栽五彩观赏椒生长的影响   总被引：1，自引：0，他引：1  

马李军  李学俊  陈丽娜  龙卫平 《长江蔬菜》2019,(12):69-72

为筛选出适于盆栽的五彩观赏椒基质配比,以椰糠、园土、牛粪组成6种不同配比基质,分析五彩观赏椒长势的动态变化、植株及结果性状、根冠比差异。试验结果表明,不同牛粪配比基质对五彩观赏椒长势有影响,在定植20d内,各处理的株高、株幅、叶片数差异小,30~50d处理差异拉大,至50d时,T5[(椰糠∶园土)∶牛粪=10∶4]的株幅、叶片数均最大。T5的植株性状、结果性状和根冠比均最优,T6其次。因此,T5基质的牛粪配比最适合五彩观赏椒盆栽。  相似文献   

Growth performance of bath sponge (Spongia officinalis Linnaeus, 1759) farmed on suspended ropes in the Dardanelles (Turkey)     

İhsan Çelik  Şükran Cirik  Uğur Altιnağaç  Adnan Ayaz  Pιnar Çelik  Haluk Tekeşoğlu  Harun Yιlmaz  Alkan Öztekin 《Aquaculture Research》2011,42(12):1807-1815

Commercial bath sponge population in the Mediterranean has been recently reduced due to diseases and the depletion of natural banks. The commercial supply is far below the demand on the last 10–15 years. In this study, we aimed to investigate the farming performance of Spongia officinalis in the Dardanelles. Sponges collected from the Dardanelles cut into pieces of different weight. They were divided into two groups depending on the wet weight ranging from 50 to 150 g (mean weight 102.6 ± 4.81 g) and from 160 to 360 g (mean weight 235.8 ± 8.56 g). Three rope systems located parallel to each other with 6–7 m inter‐distance were constructed for the cultivation of sponges. At the end of the study, while small‐sized sponges could reach mean wet weight of 120.7 ± 14.8 g, large‐sized sponges reached mean wet weight of 247.6 ± 22.4 g. Growth rates were estimated 5–17% at 21st month. The survival rates were found 82% and 88%.  相似文献   

不同冷冻贮藏时间对三种鱼类肌肉中孔雀石绿残留量的影响     

高丽娜  陈永平  马丹  李春青 《河北渔业》2014,(10):7-10

研究鲤鱼、鳗鲡、鳜鱼在加入不同浓度的孔雀石绿标准样品且在不同冷冻贮藏时间下对孔雀石绿残留量的影响。三种基质中,鳗鲡组织中添加有无色孔雀石绿降解速率最慢、鳜鱼次之、鲤鱼较快。三种基质中添加10μg/kg、50μg/kg、100μg/kg有色孔雀石绿平均降解率分别为57.9%、48.0%、23.0%;无色孔雀石绿平均降解率分别为46.6%、43.4%、19.8%,有色孔雀石绿较无色孔雀石绿降解快,低浓度较高浓度降解快。在三种基质鲤鱼、鳗鲡、鳜鱼组织中有色和无色孔雀石绿降解反应均符合准一级反应动力学。分析可能由于鳗鲡组织脂肪较多,其结合方式影响了有色无色孔雀石绿的降解。  相似文献   

Distribution of invasive plants in urban environment is strongly spatially structured     

Kateřina Štajerová  Petr Šmilauer  Josef Brůna  Petr Pyšek 《Landscape Ecology》2017,32(3):681-692

  相似文献   

Nonnenkontroll -und Vorbeugungsmethode nach Professor Forst.-Ing. Ant. Dyk.     

Ing. Dr. Octavianus Farský 《Journal of pest science》1938,14(6):65-67

Ohne Zusammenfassung Mit 3 Abbildungen.  相似文献   

秸秆粉碎还田与整地复式作业机连接装置设计与试验     

孙妮娜  王晓燕 《农业机械学报》2022,53(2):15-24，87

针对东北稻区秸秆粉碎质量不达标影响后续整地质量,机具下地作业次数多土壤压实严重的问题,设计一种连接装置可连接秸秆粉碎还田机与整地机具,一次下地实现秸秆粉碎还田与整地的复式作业。综合考虑秸秆粉碎还田与犁耕之间的交互作用与匹配性,从横垂面、纵垂面、水平面3个运动平面对连接装置进行理论分析,并通过仿真对连接装置进行稳定性分析。通过理论分析,进行连接装置横垂面幅宽匹配性、纵垂面作业位置匹配性、水平面动力学匹配性研究;根据理论分析得的连接参数,进行连接装置结构设计;通过ANSYS Workbench进行关键连接装置的静力学分析及动态分析,设计的装置满足强度要求及运输状态的稳定性要求。复式作业与分段作业的田间试验表明,复式作业能够达到犁耕的工作稳定性要求,耕深平均值为17.3 cm,耕深稳定性系数为91.2%,耕宽平均值为119.2 cm,耕宽稳定性系数为93.6%;复式作业植被覆盖率为95.7%,分段作业植被覆盖率为98.3%,二者无显著性差异,且复式作业油耗比分段作业少,可减少油耗3.15 kg/hm²。  相似文献   

基于转录组测序分析的黄精种子休眠解除相关差异基因研究     

罗丽娜  向增旭 《中国农学通报》2021,37(11):1-8

旨在获得黄精转录组数据库并挖掘参与其种子发育和休眠解除相关基因,以休眠解除前后的黄精种胚为试材,利用新一代高通量测序手段对供试样品进行转录组测序,并进行系统的生物信息学分析。黄精种子休眠解除前后样品中共得到79716个差异表达基因,上调的表达基因有60074个,下调的表达基因有19642个。休眠解除前后的黄精种胚中共有130284个差异表达基因被GO功能注释到生物进程、分子功能和细胞组分3个大类56个亚类,注释的差异表达基因与代谢过程、生物调控、细胞组分合成和酶催化活性等密切相关。KEGG代谢通路结果表明,共有65038个差异表达基因,涉及138个代谢通路,主要参与碳代谢、次生代谢产物的生物合成和多糖的代谢。基于KEGG数据库中注释结果,共发现15条与黄精种胚休眠解除相关的代谢通路。黄精种子发育与休眠解除过程,大量的种胚形态建成、多糖分解及蛋白质合成差异基因参与表达,并涉及到多个代谢途径的相互作用,构成复杂的休眠解除调控网络。  相似文献   

Glucose slows down the heat-induced aggregation of β-lactoglobulin at neutral pH     

Da Silva Pinto M  Bouhallab S  De Carvalho AF  Henry G  Putaux JL  Leonil J 《Journal of agricultural and food chemistry》2012,60(1):214-219

The behavior of β-lactoglobulin (β-Lg) during heat treatments depends on the environmental conditions. The influence of the presence or absence of a reducing sugar, namely, glucose, on the modification of the protein during heating has been studied using fluorescence, polyacrylamide gel electrophoresis (PAGE), size-exclusion chromatography (SEC), and transmission electron microscopy. Glycated products were formed during heating 24 h at 90 °C and pH 7. The fluorescence results revealed an accumulation of the advanced Maillard products and the formation of aggregates during heating. PAGE and SEC data suggested that the products in the control samples were essentially composed of covalently linked fibrillar aggregates and that their formation was faster than that for glycated samples. We showed that glucose affected the growing step of covalent aggregates but not the initial denaturation/aggregation step of native protein. Glucose-modified proteins formed a mixture of short fibrils and polydisperse aggregates. Our results revealed that β-Lg forms fibrils at neutral pH after heating and that glucose slows the formation of these fibrils.  相似文献   

Effect of soil chemical properties on growth,foliation and nutrition of Norway spruce stand affected by yellowing in the Bohemian Forest Mts., Czech Republic     

Stanislav Vacek  Michal Hejcman  Věra Semelová  Jiří Remeš  Vilém Podrázský 《European Journal of Forest Research》2009,128(4):367-375

In 1998, a fertilizer experiment aiming to investigate the effects of slow-release N, P, K and Mg fertilizer (SILVAMIX Mg NPK^®) on a 60-year-old spruce stand with symptoms of yellowing was established. In this paper, trees were selected to investigate the relation between annual diameter increment, yellowing, foliation, needle and soil chemical properties: ten from the fertilized treatment (F), ten green trees from the control (CG) and ten yellow trees from the control (CY). CG and CY trees were growing in close proximity at a distance of only several meters apart under the same soil conditions. In treatment F, increased annual diameter increment, improved foliation, needle Mg concentration, plant-available Mg and P concentrations in the soil and absence of yellow trees were recorded 7 years after a single application of the fertilizer. During the last 15 years, annual growth increment and foliation of CY trees have continuously decreased while relatively stable values were recorded for CG trees and increased for F trees. In 2006, CG and CY trees differed significantly in Mg concentration in needles, foliation, yellowing and annual diameter increment. Although differences in soil chemical properties between CG and CY treatments were not significant, lower concentrations of plant-available Mg²⁺ and higher concentrations of H⁺ and Al³⁺ were found in soils under CY trees. There was a negative correlation between soil concentration of Mg and yellowing, but this correlation was relatively weak, indicating that there is no simple relation between soil and needle concentrations of Mg. In the investigated locality, the “new type” of yellow tree decline has been a long-term gradual process.  相似文献