Population genetics. Population genetics is a subfield of genetics that deals with genetic differences within and between populations, and is a part of evolutionary biology. Studies in this branch of biology examine such phenomena as adaptation, speciation, and population structure.
In the fluid-filled case, the wellbore is presumed to be full of either all liquid or gas which gets compressed as afterflow continues into the wellbore. The wellbore storage constant (C) is a function of the wellbore volume (Vw) and the wellbore fluid compressibility (cwb) as shown below: For a fluid-filled wellbore:
1 A very thin layer of slippery, viscous joint fluid, called synovial fluid, separates and lubricates the two cartilage-covered bone surfaces. 2  A healthy knee joint has up to 4 mL, or less than a teaspoon, of synovial fluid. 2. 3  A synovial membrane encapsulates the joint surfaces and synovial fluid. A very thin layer of slippery, viscous joint fluid, called synovial fluid, separates and lubricates the two cartilage-covered bone surfaces. 2  A healthy knee joint has up to 4 mL, or less than a teaspoon, of synovial fluid. 2. 3  A synovial membrane encapsulates the joint surfaces and synovial fluid.