In this situation, translation begins at the 5' end of the mRNA while the 3' end is still attached to DNA. In all types of cells, the ribosome is composed of two subunits: the large (50S) subunit and the small (30S) subunit (S, for svedberg unit, is a measure of sedimentation velocity and, therefore, mass).
The most common types of nuclear power plants use water for cooling in two ways: 1  To convey heat from the reactor core to the steam turbines. 2  To remove and dump surplus heat from this steam circuit.
A basic knowledge of the move-. ment and usage of water in a cooling water system is es-. sential to maximizing the control over the system in prepa-. ration for running a high-cycle operation. Operation at high cycles in a cooling tower can increase. the corrosion and scaling tendencies of the water. There-. fore, exchangers that experience second- or third-pass. water can incur more problems when operating at higher. cycles.