Generating Inbred Mice. Inbred Strains. A strain is defined as inbred when it has been mated brother x sister for 20 or more consecutive generations (F20). All offspring can be traced back to a single ancestral breeding pair in the 20th or subsequent generation.
suction head. The energy per unit weight of fluid on the suction side of a pump. 1  Facebook.
The higher the fluid's specific gravity (SG), the more power is required. Another specification to consider is net positive suction head (NPSH) - the difference between the pump's inlet stagnation pressure head and the vapor pressure head. The required NPSH is an important parameter in preventing cavitation in a pump.