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<p>engineering strains of <a href="page.php?w=Escherichia_coli">Escherichia coli</a> to incorporate the necessary pathway, the Wood-Werkman cycle.</p>

<p><big>Industrial uses</big></p>
<p>Propionic acid inhibits the growth of <a href="page.php?w=Mold_%28fungus%29">mold</a> and some bacteria at levels between 0.1 and 1% by weight.  As a result, some propionic acid produced is consumed as a <a href="page.php?w=preservative">preservative</a> for both animal feed and food for human consumption. For animal feed, it is used either directly or as its <a href="page.php?w=ammonium">ammonium</a></p><p>
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