abstract |
A temperature cycling system ( 10, 110 ) is provided for repeatedly heating and cooling a reaction mixture ( 16 ). The system ( 10, 110 ) includes a first heater ( 27 ) and a second heater ( 28 ) each movable between a first orientation in which the first or second heater ( 27, 28 ) affects the temperature of the reaction mixture ( 16 ) and a second orientation in which the first or second heater ( 27, 28 ) does not substantially affect the temperature of the reaction mixture ( 16 ). During temperature cycling, the second heater ( 28 ) is in the second orientation when the first heater ( 27 ) is in the first orientation, and the second heater ( 28 ) is in the first orientation when the first heater ( 27 ) is in the second orientation. |