In this article, a rapid, sensitive, and disposable microfluidic immunosensor is presented for point-of-care (POC) testing and clinical diagnosis. For the first time, the blocking process is eliminated from a microfluidic heterogeneous immunoassay by using protein A functionalized polydimethylsiloxane microchannels. The nonspecific binding of the assay is maintained around the chip background level by using a pair of antibodies with different affinity to protein A under optimized experimental conditions. C-reactive protein (CRP), a biomarker for inflammation and cardiovascular disease risk assessment, is selected as a model analyte to demonstrate the sensitivity of this blocking-free microfluidic heterogeneous immunoassay. A four parameter logistic function is used to model and assess the data. The limit of detection obtained is 0.54 μg/mL, which is lower than the cut-off value for clinical diagnosis. The overall assay is completed in 5 min. The protein A modified PDMS chips wet-stored at 4°C can maintain biofunctionality up to 14 months. The developed blocking-free microfluidic heterogeneous immunoassay will immediately provide benefits to most immunosensing microdevices targeted for POC diagnostics by shortening analysis time, simplifying fluid transportation, reducing sample consumption, and lowering waste generation.
El presente artículo describe el diseño de un collar que porta un código QR para la identificación de las mascotas por medio de una aplicación de software. Se almacena el registro de sus datos y toda la información que los dueños consideren relevante. Este desarrollo permitió que un sector de estudiantes realizase un registro exitoso de sus mascotas en el aplicativo, demostrando un correcto funcionamiento.
El artículo socializa el diseño de un software para la validación de unos indicadores para analizar el impacto económico y social de las cooperativas de ahorro y crédito, analizando la información de la organización cooperativa, para validar de esta manera el cumplimiento del objeto social y económico, generando datos relevantes, confiables y útiles, para la toma de decisiones. El software se diseñó bajo la metodología clásica en cascada siendo necesario para las prácticas sociales esenciales de las cooperativas.
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