Atto

An electrical device designed to reduce the strength of a signal.

The G-protein coupled receptor (GPCR) family transduces extracellular signals across the plasma membrane, activating cellular responses through a variety of second messenger…

Adjustment for the effect of tissue thicknesses through which gamma's travel from an activity concentration origin to the scanner's detectors. The count…

The fraction of beam intensity being lost per unit length of the transmitting material in a chosen x direction.

A weakening in force or intensity.

Live vaccines prepared from microorganisms which have undergone physical adaptation (e.g., by radiation or temperature conditioning) or serial passage in laboratory animal…