A method for assaying the proteinase inhibitor content of tissue of a plant. The inner tubular comprises an axially extending lip seal. In one embodiment, the unrefined plant protein material of the meat product has a nitrogen solubility index of from about 30% to about 80% and at least one of the following properties: a salt tolerance index of from about 30% to about 80%; a water hydration capacity of at least 3. In another embodiment, the bond pads of a substrate are coated with a flux or adhesive and lowered into a fluidized ball reservoir for direct attachment of solder balls. Consequently, a sag can be reduced.