The description relates to an exhaust gas purification system for exhaust gases that are emitted from an internal combustion engine, in particular a diesel engine. The switch is manually movable between on and off position and is adapted to electrically connect the power supply to the bulb when the switch is in the on position, and in response to disposing the switch in the on position, heat generated by the bulb is dissipated through the conductor, the heat sink, and the openings. The feedstuff contains a pure finely divided cellulose additive and optionally a prebiotic additive. The invention further provides isolation and culturing methods of taste cells wherein the time that the cells are exposed to isolation solution and proteolytic enzymes is minimized and the cells are cultured in coated culture vessels with the medium replaced in intervals of at least 5 days from first replacement onwards. A data entry access to the data model comprises dynamically constructing search indexes, each search index defined as a unique data field and a text searchable concatenation of other fields’ data in any given data table of the data model.