A mixer for anaerobic decomposition of sludge in a digester, captures and compresses biogas emitted by the decomposing sludge. In particular examples, a wheat variety comprising high gluten content is designated AUBR31101W, AUIMIW30494, AUBR31109W, AUBR31117W, AUBR31059W, or AUBR30450W. A second semiconductor chip has a wiring structure including a plurality of wiring layers, a second coil formed over the wiring structure, and an insulation film formed over the wiring structure. A content flow engine configured to automatically select the content sessions based on the at least item of interest and on content flow rules and initiate presentation of the selected content sessions via the user interface. For example, various metal-oxide-semiconductor field-effect transistors can include a dielectric layer andor a passivation layer prepared from such polysulfone-based materials and exhibit good device performance. The improvement resides in storing the gases in a liquid incorporating a reactive compound having Lewis basicity capable of effecting a reversible reaction between a gas having Lewis acidity.