Techniques, apparatuses and systems for providing communications based on time reversal of a channel impulse response of a pulse in a transmission channel between a transmitter and a receiver to enhance reception and detection of a pulse at the receiver against various effects that can adversely affect and complicate the reception and detection of the pulse at the receiver. In a mobile communication system having a first mobile station on a calling side, a second MS on a called side, and a base station and an MSC that enable communication between the first and second MSs, the MSC has a storage component that stores picture information of each MS. This spares the individual the inconvenience of generating his or her own electronic-mail referrals, and also enables the central controller to determine the format and tone of the referral. It is preferable to adjust the predetermined temperature to be slightly higher than the bubbling temperature of liquid, particularly to 250 to 490 C. A rotational driver-coupling is mounted to the proximal end of the screw, allowing for activation of the canister by engaging the screw. Diagnostic kits containing such polypeptides, DNA sequences or antigenic epitopes and a suitable detection reagent may be used for the detection of B.