A microfluidic sensing device comprising: a channel ; an impedance sensor within the channel , the impedance sensor comprising: a local ground within the channel ; and an electrode within the channel , wherein the local ground and the electrode are to form an electric field region that is elongated along the channel , a platform supporting the channel and the electrode and the local ground of the impedance sensor; a circuit supported upon the platform to generate the electric field region using the electrode and the local ground of the impedance sensor; and a pump supported upon the platform configured to move liquid and particles through the channel across the impedance sensor, characterized in that the pump comprises a bubble jet pump comprising a resistor configured to be fired to a temperature so as to vaporize a portion of the liquid to form a bubble which drives surrounding liquid and particles, wherein the resistor additionally serves as a heating device, the device further comprising: - a controller configured to control operation of the pump and heating of the device by the resistor, such that the heating device heats the microfluidic sensing device to a prescribed temperature, and - a temperature sensor configured to detect a temperature to which the device has been heated by the resistor, the temperature sensor being in communication with said controller to provide a closed loop feedback regarding the heating of the device by the resistor. a channel ; an impedance sensor within the channel , the impedance sensor comprising: a local ground within the channel ; and an electrode within the channel , wherein the local ground and the electrode are to form an electric field region that is elongated along the channel , a local ground within the channel ; and an electrode within the channel , wherein the local ground and the electrode are to form an electric field region that is elongated along the channel , a platform supporting the channel and the electrode and the local ground of the impedance sensor; a circuit supported upon the platform to generate the electric field region using the electrode and the local ground of the impedance sensor; and a pump supported upon the platform configured to move liquid and particles through the channel across the impedance sensor, characterized in that the pump comprises a bubble jet pump comprising a resistor configured to be fired to a temperature so as to vaporize a portion of the liquid to form a bubble which drives surrounding liquid and particles, wherein the resistor additionally serves as a heating device, the device further comprising: - a controller configured to control operation of the pump and heating of the device by the resistor, such that the heating device heats the microfluidic sensing device to a prescribed temperature, and - a temperature sensor configured to detect a temperature to which the device has been heated by the resistor, the temperature sensor being in communication with said controller to provide a closed loop feedback regarding the heating of the device by the resistor. - a controller configured to control operation of the pump and heating of the device by the resistor, such that the heating device heats the microfluidic sensing device to a prescribed temperature, and - a temperature sensor configured to detect a temperature to which the device has been heated by the resistor, the temperature sensor being in communication with said controller to provide a closed loop feedback regarding the heating of the device by the resistor. <EOS>