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Surfactant-free CO2-based microemulsion-like systems

Surfactant-free CO2-based microemulsion-like systems

                                                         Robert F. Hankel, Paula E. Rojas, Mary Cano-Sarabia, Santi Sala, Jaume Veciana, Andreas Braeuer* and Nora Ventosa* Chem. Commun., 2014,50, 8215-8218

Detection of the early stage of recombinational DNA repair by silicon nanowire transistors

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nanolett26042012

Marco Chiesa, Paula P. Cardenas, Francisco Otón, Javier Martinez, Marta Mas-Torrent, Fernando Garcia, Juan C. Alonso, Concepció Rovira, Ricardo Garcia

Nano Lett. 2012, 12, 1275−1281.

dx.doi.org/10.1021/nl2037547

A silicon nanowire-based biosensor has been designed and applied for label-free and ultrasensitive detection of the early stage of recombinational DNA repair by RecA protein. Silicon nanowires transistors were fabricated by atomic force microscopy nanolithography and integrated into a microfluidic environment. The sensor operates by measuring the changes in the resistance of the nanowire as the biomolecular reactions proceed. We show that the nanoelectronic sensor can detect and differentiate several steps in the binding of RecA to a single-stranded DNA filament taking place on the nanowire-aqueous interface. We report relative changes in the resistance of 3.5% which are related to the interaction of 250 RecA·single-stranded DNA complexes. Spectroscopy data confirm the presence of the protein-DNA complexes on the functionalized silicon surfaces.







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