Sealing of a microfluidic cartridge is a challenge, because the cartridge commonly contains heat-sensitive biomolecules that must also be protected from contamination. In addition, the objective is usually to obtain a sealing method suitable for mass production. Laser welding is a rapid technique that can be accomplished with low unit costs. Even though the technique has been widely adopted in ...

Deficiencies of vitamin A and iron affect a significant portion of the world's population, and efforts to characterize patterns of these deficiencies are hampered by a lack of measurement tools appropriate for large-scale population-based surveys. Vitamin A and iron are not easily measured directly, so reliable proxy markers for deficiency status have been identified and adopted. Measurement of...

This paper presents a simple fluid handling technique for microchip immunoassay. Necessary solutions were sequentially injected into a microchannel by air-evacuated poly(dimethylsiloxane), and were passively regulated by capillary force at the inlet opening. For heterogeneous immunoassay, microchips are potentially useful for reduction of sample consumption and assay time. However, most of the ...

Immunoassays are among the most powerful and useful techniques for analysis of biological materials. There are numerous variations in which immunoassays can be performed. Coupled with enzyme, using chromogenic substrates, the enzyme immunoassay technique is used to trace the target antigen in tissues. The technique also is used to measure the concentration of antigen in tissue extracts. This ch...

forty renal allograft patients with three months under immunosuppression by cycloserine were examined for their gingival overgrowth and it's correlation with several parameters including the trough levels of blood cyclosporine and it's metabolites measured by the fluorescence polarization immunoassay technique. no correlation was found between the scores of gingival overgrowth and both the age ...