目的观察猪带绦虫六钩蚴45 W-4B抗原对仔猪的免疫保护作用。方法用IPTG诱导表达融合蛋白GST-45W-4B,用GST柱进行纯化,以Montan ide ISA 206为佐剂制成疫苗免疫仔猪。间接ELISA检测仔猪血清抗45W-4B IgG抗体水平,MTT法进行外周血淋巴细...目的观察猪带绦虫六钩蚴45 W-4B抗原对仔猪的免疫保护作用。方法用IPTG诱导表达融合蛋白GST-45W-4B,用GST柱进行纯化,以Montan ide ISA 206为佐剂制成疫苗免疫仔猪。间接ELISA检测仔猪血清抗45W-4B IgG抗体水平,MTT法进行外周血淋巴细胞殖试验。免疫1个月后全部实验组经口攻击感染25000枚/头猪带绦虫虫卵,攻虫3个月后剖检,计算减虫率及保护率。结果免疫组注射疫苗的第2周起,抗体为阳性,45W-4B组持续升高至第8周,淋巴细胞增殖明显高于未免疫感染组。用该抗原制备的疫苗获得了95%的减虫率和33%的保护率。结论该抗原对猪囊尾蚴病具有很好的免疫保护作用。展开更多
The microstructure and properties of the 93W-4Ni-2Co-1Fe(mass fraction,%) tungsten heavy alloys prepared by mechanical alloying and electric current activated sintering from mixed elemental powders were investigated.A...The microstructure and properties of the 93W-4Ni-2Co-1Fe(mass fraction,%) tungsten heavy alloys prepared by mechanical alloying and electric current activated sintering from mixed elemental powders were investigated.After 15 h milling,the average W grain size in the powders is decreased to 120 nm.For the powders milled for 15 h,the density,hardness and transverse rupture strength of the alloys sintered only by an intensive pulse electric current are the maximum.When the total sintering time keeps constant,the properties of the sintered alloys can be obviously improved by optimizing the sintering time of pulse-and constant-currents.A bulk ultrafine alloy with an average W grain size of about 340 nm can be obtained by sintering 15 h-milled powders in a total sintering time of 6 min.The corresponding sintered density,hardness and transverse rupture strength reach 16.78 g /cm3,HRA84.3 and 968 MPa,respectively.展开更多
文摘目的观察猪带绦虫六钩蚴45 W-4B抗原对仔猪的免疫保护作用。方法用IPTG诱导表达融合蛋白GST-45W-4B,用GST柱进行纯化,以Montan ide ISA 206为佐剂制成疫苗免疫仔猪。间接ELISA检测仔猪血清抗45W-4B IgG抗体水平,MTT法进行外周血淋巴细胞殖试验。免疫1个月后全部实验组经口攻击感染25000枚/头猪带绦虫虫卵,攻虫3个月后剖检,计算减虫率及保护率。结果免疫组注射疫苗的第2周起,抗体为阳性,45W-4B组持续升高至第8周,淋巴细胞增殖明显高于未免疫感染组。用该抗原制备的疫苗获得了95%的减虫率和33%的保护率。结论该抗原对猪囊尾蚴病具有很好的免疫保护作用。
基金Project(2007CB616905) supported by the National Basic Research Program of ChinaProject(2007AA03Z112) supported by the National High-tech Research and Development Program of China+1 种基金Project(x2jqB6080210) supported by the Natural Science Foundation of Guangdong Province,ChinaProject(9140A18040709JW1601) supported by the Advanced Research Fund of Department of Defense,China
文摘The microstructure and properties of the 93W-4Ni-2Co-1Fe(mass fraction,%) tungsten heavy alloys prepared by mechanical alloying and electric current activated sintering from mixed elemental powders were investigated.After 15 h milling,the average W grain size in the powders is decreased to 120 nm.For the powders milled for 15 h,the density,hardness and transverse rupture strength of the alloys sintered only by an intensive pulse electric current are the maximum.When the total sintering time keeps constant,the properties of the sintered alloys can be obviously improved by optimizing the sintering time of pulse-and constant-currents.A bulk ultrafine alloy with an average W grain size of about 340 nm can be obtained by sintering 15 h-milled powders in a total sintering time of 6 min.The corresponding sintered density,hardness and transverse rupture strength reach 16.78 g /cm3,HRA84.3 and 968 MPa,respectively.
