Systems and methods for providing personalized services to remote customers using personal teller machines from a centralized call center. The sense amplifier also can include a pump capacitor substantially maintaining a value of the reference signal; and a gain circuit coupled with the reference node and disposed to adaptively adjust gain of an output signal produced by the sense amplifier. An exemplary catheter in accordance with the disclosure includes an elongate body having a proximal end and a distal end, and a retractable sheath mounted on the elongate body proximate the distal end. Other embodiments are formed by fastening together a group of elements to form different housing configurations. A thermal insulating device is provided comprising an insulating material, the device having a plurality of chambers for receiving specimen samples, the device further includes a thermal ballast whereby the rate of thermal energy removal is controlled and influenced by the thermal ballast.