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.
1 Wild Bird Seed is commonly abbreviated WBS and is often a mixture of several different types of seeds and can be used as either a loose grain or as a cake substrate. 2  When it is dry, it can be powdered to create a flour commonly abbreviated as WBSF.