The composition of neutral, polar and sphingolipids of Hall & Dunn during resting spore formation has been investigated. Sporogenesis was accompanied by an increase in the total lipid concentration and a decrease in the polar/neutral lipid ratio. The most prevalent neutral lipid fatty acids were C, C, C and C; the concentration of C increased greatly during sporogenesis. Polar lipids were characterized by high concentrations of C, C and C; the concentration of C decreased and those of C and C increased during resting spore formation. The fatty acid composition of neutral and polar lipids was similar in several strains of and proved their conspecificity irrespective of the facility with which each strain produced resting spores.


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