Apical growth in facultative Anaerobic actinomycetes as determined by immunofluorescent labeling

Apical growth, following synthesis of newly formed cell wall material at the poles of rods of Actinomyces israelii, A. naeslundii, Arachnia propionica and Bacterionema matruchotii, has been demonstrated by means of immunofluorescent labeling, confirming previous observations by scanning electron microscopy. Some implications of the phenomenon are discussed.