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德國Spherotech
Spherotech公司是全球最知名的微球產品生產商之一。Beckton Dickinson（BD）公司即用Spherotech的Rainbow熒光微球來對其流式細胞儀進行靈敏度的校驗。
Spherotech公司生產的微球廣泛的應用于生物醫學研究和診斷，包括免疫熒光和免疫酶學檢測等。其微球適用于熒光顯微鏡技術、激光共聚焦（Confocal）技術、流式細胞術、影像細胞術、磁性細胞分離技術、磁珠酶免測定法(EIA)等多種檢測方法。
Spherotech常規生產高質量的乳膠微球、熒光微球、順磁性微球、鐵磁性微球和多種有色微球，這些微球表面可根據應用的需要添加不同的功能基團(如羧基和氨基等)。此外，Spherotech公司還生產各種包被有抗體或配體，如親合素、鏈霉親合素和生物素等的微球，用于免疫學的研究和臨床。

Spherotech was established in 1992 to manufacture and supply uniform microparticles for biomedical and diagnostic applications. It is located in Lake Forest, Illinois, about 25 miles north of Chicago. From inception, Spherotech has established itself as a reliable source of various microparticles. Our experienced staff working in our well-equipped laboratory and manufacturing facility routinely makes high quality latex, fluorescent, paramagnetic, ferromagnetic and various colored microparticles. The surfaces of these particles are modified with functional groups to suit various applications. We also manufacture particles that are coated with various antibodies or ligands such as avidin, streptavidin and biotin for immunological applications.

Microparticles manufactured by Spherotech are used in applications such as fluorescence immunoassay, enzyme immunoassay, fluorescence microscopy, confocal fluorescence microscopy, flow cytometry, image cytometry, magnetic cell separation, magnetic particles EIA and many other applications.