Disclosed are systems, apparatus, methods, and computer readable media for selecting updates to associated records to publish on an information feed in an on-demand database service environment. In one of the images, a region of interest, such as a tumor, is identified. Also, existence of a false broken concave condition can be diagnosed by movements of the concave responsive to operation of the driver. Additionally, a cathode reservoir is also multiplexed with one or more separation channels. The analog-to-digital converter is configured to provide a digital output signal in response to the buffered input signal.