Semipermeable means the cell membrane can pick and choose what goes out of it and into it. At least, that's what I believe it is.
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Maize (Zea mays); energy; protein quality; nutritive value; poultry ... Although it is the preferred grain for feeding poultry [5], it is found to be low in protein ... Maize provides more feed for livestock than any other cereal grain [6]. ... of maize, particularly from the main end‐products of the “wet‐milling” process of starch
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the exploitation of biological processes for industrial and other purposes, especially the genetic manipulation of microorganisms for the production of antibiotics, hormones, etc.