title: Generation of oxygen gradients with arbitrary shapes in a microfluidic device.
abstract: We present a system consisting of a microfluidic device made of gas-permeable polydimethylsiloxane (PDMS) with two layers of microchannels and a computer-controlled multi-channel gas mixer. Concentrations of oxygen in the liquid-filled flow channels of the device are imposed by flowing gas mixtures with desired oxygen concentrations through gas channels directly above the flow channels. Oxygen gradients with different linear, exponential, and non-monotonic shapes are generated in the same liquid-filled microchannel and reconfigured in real time. The system can be used to study directed migration of cells and the development of cell and tissue cultures under gradients of oxygen.
authors.affiliation: Department of Physics, University of California, San Diego, 9500 Gilman Drive, MC 0374, La Jolla, CA 92093, USA.
authors.forename: Micha
authors.initials: M
authors.lastname: Adler
authors.forename: Mark
authors.initials: M
authors.lastname: Polinkovsky
authors.forename: Edgar
authors.initials: E
authors.lastname: Gutierrez
authors.forename: Alex
authors.initials: A
authors.lastname: Groisman
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D017022:Flow Injection Analysis / Q000295:instrumentation*; D046210:Microfluidic Analytical Techniques / Q000295:instrumentation*; D010100:Oxygen / Q000032:analysis* / Q000737:chemistry*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D010100:Oxygen