Millisia

Abstract

Mil.li'si.a N.L. fem. n. named after Nancy F. Millis, a celebrated microbiologist who promoted wastewater microbiology in Australia Actinobacteria / Actinobacteria / Corynebacteriales / Nocardiaceae / Millisia Aerobic, Gram‐stain‐positive to Gram‐stain‐variable, acid–alcohol‐fast, nonmotile, catalase‐positive actinomycete that forms non‐sporing rods which show only rudimentary right‐angled branching and which contain polyphosphate storage granules. In stationary phase, the rods fragment into spherical unicells (Figure 1). Salmon pink, irregular colonies with filamentous margins and sparse unbranched aerial hyphae are formed on glucose‐yeast extract agar. Colonies are matt and dry in appearance, soft in texture, and easy to emulsify. Diffusible pigments are not produced. Whole‐organism hydrolysates are rich in meso ‐diaminopimelic acid, arabinose, and galactose. The organism contains N ‐glycolated muramic acid residues, a predominant dihydrogenated menaquinone with eight isoprene units, and diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol, phosphatidylinositol, and phosphatidylinositol mannosides as major polar lipids. Mycolic acids have 44–52 carbon atoms (principal components C 48 , C 50 , and C 52 ), and oleic, palmitic, and palmitoleic acids are the predominant fatty acids, with relatively small amounts of myristic, stearic, and tuberculostearic acids. A member of the family Nocardiaceae in the order Corynebacteriales . DNA G+C content (mol%) : 64.7 (HPLC). Type species : Millisia brevis Soddell, Stainsby, Eales, Kroppenstedt, Seviour and Goodfellow 2006a, 742 VP .