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Articles by Nicholas N. Watkins in JoVE
JoVE Bioengineering
Çok kanallı mikroakışkan Cihazlar ayırmak Boncuk ve Hücreler Dielectrophoresis ve Laminar Flow
1Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, 2Micro and Nanotechnology Lab, University of Illinois at Urbana-Champaign, 3Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, 4Bioengineering, University of Illinois at Urbana-Champaign
Dielectrophoresis (DEP) hücreleri manipüle etmek için etkili bir yöntemdir. Baskılı devre kartları (PCB) mikroakışkan cihazlar içinde ücretsiz cep manipülasyon için yeniden kullanılabilir, ucuz ve etkili elektrotlar sağlayabilir. PCB üzerinde lamelleri ile PDMS tabanlı mikroakışkan kanalların bir araya getirerek, çok kanallı mikroakışkan cihazlar içinde boncuk ve hücre manipülasyon ve ayrılık göstermektedir.
Other articles by Nicholas N. Watkins on PubMed
A Microfabricated Electrical Differential Counter for the Selective Enumeration of CD4+ T Lymphocytes
We have developed a microfabricated biochip that enumerates CD4+ T lymphocytes from leukocyte populations obtained from human blood samples using electrical impedance sensing and immunoaffinity chromatography. T cell counts are found by obtaining the difference between the number of leukocytes before and after depleting CD4+ T cells with immobilized antibodies in a capture chamber. This differential counting technique has been validated to analyze physiological concentrations of leukocytes with an accuracy of ∼9 cells per µL by passivating the capture chamber with bovine serum albumin. In addition, the counter provided T cell counts which correlated closely with an optical control (R(2) = 0.997) for CD4 cell concentrations ranging from approximately 100 to 700 cells per µL. We believe that this approach can be a promising method for bringing quantitative HIV/AIDS diagnostics to resource-poor regions in the world.
