Merhylobucterium rhodesiunum MB 126, a pink-pigmented facultatively methylotrophic bacterium that uses the serine pathway for the assimilation of reduced C1 compounds, is able to produce poly-3-hydroxybutynte (PHB) under certain limitation conditions. Mutants of this bacterium, which were isolated after the treatment with sodium nitrite, are impaired in their ability to synthesize PHB, but produce another polymer in addition to PHB. namely an exopolysaccharide (EPS). This paper attempts to explain this surpri…
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