I've seen dynamic memory work better with other guests though, so it might be either something I'm doing wrong, or a side effect of the File Server role. Either way, I've gotten better results with setting static amounts of RAM on my file/DFS servers.
A biological heart valve is a heart valve recovered from a donor or created from donor tissue. A cadaveric valve comes from a human donor. Bovine valves are recovered from cows and porcine valves come from pigs.
The mitral valve is one of the four heart valves. It controls proper blood flow from the left atrium into the left ventricle. In mitral valve prolapse, the valve bulges inward and does not close properly. Most people with mitral valve prolapse are born with it.