Metallothioneins （MTs） were discovered in 1957 by Margoshes and Vallee and identified as low-molecular weight and sulphydryl rich proteins. It is not surprising that most mammalian tissues contain age related basal ...Metallothioneins （MTs） were discovered in 1957 by Margoshes and Vallee and identified as low-molecular weight and sulphydryl rich proteins. It is not surprising that most mammalian tissues contain age related basal levels of MTs since they are involved in metalloregulatory processes that include cell growth and multiplication. In an effort to understand the biology of this intriguing tumor, various biomarkers such as oncogenes, p53 tumor suppressor gene, war 1 protein, proliferating cell nuclear antigen, telomerase, microsatellite markers and cytogenetic changes have been examined. One biomarker which has recently shown to be expressed in various human tumors but still less reported in carcinoma is MT. Immunohistochemical detection of MT proteins in cold acetone-fixed paraffin embedded liver sections was performed by the streptavidin-avidin-biotin immunoperoxidase complex method.展开更多
AIM： To detect Salmonella enteritidis （S. enteritidis） in paraffin slices and antigen location in infected duck tissues. METHODS： The rabbits were immunized with purified bacillus to obtain S. enteritidis-specific...AIM： To detect Salmonella enteritidis （S. enteritidis） in paraffin slices and antigen location in infected duck tissues. METHODS： The rabbits were immunized with purified bacillus to obtain S. enteritidis-specific antibody, which were then extracted by the caprylic-ammonium sulphate method, purified through High-Q columns. An indirect immuno-fluorescent staining method （IFA） was established to detect the S. enteritidis antigen in paraffin slices. Detected S. enteritidis in each organ tissue of ducklings experimentally infected with S. enteritidis. RESULTS： The gland of Garder, heart, kidney, spleen, liver, brain, ileum, jejunum, bursa of Fabricius from S. enteritidis experimentally infected ducklings were positive or strongly positive, and the S. enteritidis antigen mainly distributed in the infected cell cytoplasm.CONCLUSION： IFA is an intuitionist, sensitive and specific method in detecting S. enteritidis antigen in paraffin wax slices, and it is a good method in diagnosis and antigen location of S. enteritidis. We also conclude that the gland of Garder, heart, kidney, spleen, liver, ileum, jejunum are target organs in S. enteritidis infections of duck, and S. enteritidis is an intracellular parasitic bacterium.展开更多
【目的】结合纳米技术建立检测大肠杆菌(Escherichiacoli)O157∶H7高灵敏检测技术。【方法】采用化学共沉淀法制备出核心粒径约为10nm的免疫纳米磁颗粒,柠檬酸钠还原法制备粒径约为20nm的免疫胶体金。压电免疫传感器通过金黄色葡萄球菌...【目的】结合纳米技术建立检测大肠杆菌(Escherichiacoli)O157∶H7高灵敏检测技术。【方法】采用化学共沉淀法制备出核心粒径约为10nm的免疫纳米磁颗粒,柠檬酸钠还原法制备粒径约为20nm的免疫胶体金。压电免疫传感器通过金黄色葡萄球菌蛋白A(Protein A from Staphylococcus aureus SPA)法将抗体固定于石英晶振上,两种免疫纳米颗粒借助不同的抗体连接于传感器上对检测频率信号进行放大。【结果】SPA在石英晶振上的最佳固定浓度和时间为1.2mg/mL和40min,抗体的最佳固定浓度和时间为1.0mg/mL和60min。压电免疫传感器通过两种免疫纳米颗粒的放大作用,使其对大肠杆菌O157∶H7的检测限从104cfu/mL提高到101cfu/mL。【结论】免疫纳米颗粒强化对压电免疫传感器的检测频率信号具有很好的放大效应,可以明显提高其检测灵敏度。展开更多
A piezoelectric immunoassay based on nanoprobe immunoagglutination was proposed for rapid and sensitive detection of IgG. The nanoprobes were prepared by labeling gold nanoparticles with anti-IgG antibody. And a piezo...A piezoelectric immunoassay based on nanoprobe immunoagglutination was proposed for rapid and sensitive detection of IgG. The nanoprobes were prepared by labeling gold nanoparticles with anti-IgG antibody. And a piezoelectric sensor was used to monitor the changes in solution density and viscosity caused by the immunoagglutination of IgG and anti-IgG nanoprobes. The effects of pH and ionic strength were investigated. It is found that the developed immunoagglutination assay is sensitive to IgG with the detection limit of 1.12, 0.72, 0.70 nmol/L to the detection time of 10, 20, 30 min, respectively, and it is unnecessary for immobilization of immunoactive entities.展开更多
文摘Metallothioneins （MTs） were discovered in 1957 by Margoshes and Vallee and identified as low-molecular weight and sulphydryl rich proteins. It is not surprising that most mammalian tissues contain age related basal levels of MTs since they are involved in metalloregulatory processes that include cell growth and multiplication. In an effort to understand the biology of this intriguing tumor, various biomarkers such as oncogenes, p53 tumor suppressor gene, war 1 protein, proliferating cell nuclear antigen, telomerase, microsatellite markers and cytogenetic changes have been examined. One biomarker which has recently shown to be expressed in various human tumors but still less reported in carcinoma is MT. Immunohistochemical detection of MT proteins in cold acetone-fixed paraffin embedded liver sections was performed by the streptavidin-avidin-biotin immunoperoxidase complex method.
基金the National Key Technology R&D Program of China, No. 2004BA 901A 03National Scientific and Sechnical Support Program, No. 2007Z06-017+3 种基金The Cultvation Fund of the Key Scientific and Technical Innovation Project & Ministry of Education of China, No. 706050Program for New Century Excellent Talents in University, No. NCET-04-0906/NCET-06-0818Sichuan Province Basic Research Program, No. 04JY0290061/07JY029-017Program for Key Disciplines Construction of Sichuan Province No. SZD0418
文摘AIM： To detect Salmonella enteritidis （S. enteritidis） in paraffin slices and antigen location in infected duck tissues. METHODS： The rabbits were immunized with purified bacillus to obtain S. enteritidis-specific antibody, which were then extracted by the caprylic-ammonium sulphate method, purified through High-Q columns. An indirect immuno-fluorescent staining method （IFA） was established to detect the S. enteritidis antigen in paraffin slices. Detected S. enteritidis in each organ tissue of ducklings experimentally infected with S. enteritidis. RESULTS： The gland of Garder, heart, kidney, spleen, liver, brain, ileum, jejunum, bursa of Fabricius from S. enteritidis experimentally infected ducklings were positive or strongly positive, and the S. enteritidis antigen mainly distributed in the infected cell cytoplasm.CONCLUSION： IFA is an intuitionist, sensitive and specific method in detecting S. enteritidis antigen in paraffin wax slices, and it is a good method in diagnosis and antigen location of S. enteritidis. We also conclude that the gland of Garder, heart, kidney, spleen, liver, ileum, jejunum are target organs in S. enteritidis infections of duck, and S. enteritidis is an intracellular parasitic bacterium.
文摘【目的】结合纳米技术建立检测大肠杆菌(Escherichiacoli)O157∶H7高灵敏检测技术。【方法】采用化学共沉淀法制备出核心粒径约为10nm的免疫纳米磁颗粒,柠檬酸钠还原法制备粒径约为20nm的免疫胶体金。压电免疫传感器通过金黄色葡萄球菌蛋白A(Protein A from Staphylococcus aureus SPA)法将抗体固定于石英晶振上,两种免疫纳米颗粒借助不同的抗体连接于传感器上对检测频率信号进行放大。【结果】SPA在石英晶振上的最佳固定浓度和时间为1.2mg/mL和40min,抗体的最佳固定浓度和时间为1.0mg/mL和60min。压电免疫传感器通过两种免疫纳米颗粒的放大作用,使其对大肠杆菌O157∶H7的检测限从104cfu/mL提高到101cfu/mL。【结论】免疫纳米颗粒强化对压电免疫传感器的检测频率信号具有很好的放大效应,可以明显提高其检测灵敏度。
文摘A piezoelectric immunoassay based on nanoprobe immunoagglutination was proposed for rapid and sensitive detection of IgG. The nanoprobes were prepared by labeling gold nanoparticles with anti-IgG antibody. And a piezoelectric sensor was used to monitor the changes in solution density and viscosity caused by the immunoagglutination of IgG and anti-IgG nanoprobes. The effects of pH and ionic strength were investigated. It is found that the developed immunoagglutination assay is sensitive to IgG with the detection limit of 1.12, 0.72, 0.70 nmol/L to the detection time of 10, 20, 30 min, respectively, and it is unnecessary for immobilization of immunoactive entities.
