Some people with chest pain have normal or minimal narrowing of heart arteries; in these patients, vasospasm is a more likely cause for the pain, sometimes in the context of Prinzmetal's angina and syndrome X.
You are here. Pure Live Seed. Pure live seed (PLS) is a measure used by the seed industry to describe the percentage of a quantity of seed that will germinate. PLS is obtained by multiplying the purity percentage by the percentage of total viable seed, then dividing by 100.
Forget cryopreservation â hot and dry conditions might be all you need to awake far into the future. A date palm seed some 2000 years old â preserved by nothing more than storage in hot and dry conditions â has germinated, making it the oldest seed in the world to do so. The ancient seed was found along with several others in the 1960s in the Masada fortress on the edge of the Dead Sea in Israel.