Actinomyces naeslundii str. Howell 279

Actinomyces naeslundii str. Howell 279 is a gram-positive, rod-shaped bacterium that thrives in a mesophilic temperature range, classified as a chemoheterotroph. This microbe primarily inhabits the human oral cavity, yet has been isolated from other body sites such as the gastrointestinal tract and respiratory tract. A. naeslundii is considered an obligate anaerobe, meaning it requires an oxygen-free environment for optimal growth, and it is commonly found in biofilms associated with dental plaque. As a gram-positive organism, A. naeslundii retains the crystal violet stain used in the Gram staining procedure, resulting in a deep purple appearance under a microscope. This characteristic is indicative of a thick peptidoglycan layer in its cell wall, which provides structural strength and plays a role in its pathogenic potential. The rod-shaped morphology is typical for many species within the Actinomyces genus, allowing for efficient colonization and interaction with other microbes. Being a chemoheterotroph, A. naeslundii derives its energy and carbon from organic compounds, which it accesses in the nutrient-rich environments of the human body. Its anaerobic nature facilitates its survival in low-oxygen niches, allowing it to coexist with other microorganisms in the complex and dynamic oral microbiome. This microbe plays a crucial role in dental health, as it contributes to the formation of dental plaque, a precursor to caries and periodontal diseases. Moreover, A. naeslundii has been studied for its potential applications in biotechnology and medicine, given its enzymatic capabilities and interactions with other microbial species in the human microbiome. Its unique properties make it a subject of interest in research related to oral health and microbial ecology.