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.
Noun. 1. pulmonary valve-a semilunar valve between the right ventricle and the pulmonary artery; prevents blood from flowing from the artery back into the heart. semilunar valve-a heart valve with cusps shaped like half-moons; prevents blood from flowing back into the heart. 1  Facebook.2  Twitter.ulmonary valve-a semilunar valve between the right ventricle and the pulmonary artery; prevents blood from flowing from the artery back into the heart.