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Streptococcus pneumoniae (pneumococcus) is a Gram-positive, oval-to-lancet-shaped diplococcus; it is a facultative anaerobe that forms α-hemolytic colonies and is pathogenic only in humans. More than 100 capsular serotypes have been identified on the surface, linked covalently to teichoic acids【1】 via phosphorylcholine【2】; the capsule is both the key to immune evasion and the target of current vaccines.Serotype Diversity and Capsule BiologyThe structural diversity of the glycocalyx【3】 distinguis

Vibrio cholerae is a Gram-negative, comma-shaped, motile bacterium that causes cholera. It spreads via the fecal-oral route, primarily through contaminated water and food, and poses serious public health challenges under inadequate sanitation conditions. Naturally present in aquatic ecosystems, V. cholerae is notable for its environmental reservoirs and pathogenic properties. Microbiological CharacteristicsMorphology and PhysiologyVibrio cholerae is a Gram-negative, comma-shaped bacterium belong

A series of bacteria, cell have adapted to intracellular parasitism, but living within the cell nucleus is exceedingly rare for “high-level parasitism.” Nuclear parasitism is typically carried out by protists via pathogenic bacteria; however, a new study published in Nature Microbiology has identified such a phenomenon in deep-sea snails. ‘Ca. Endonucleobacter’ bacteria live in the gills of the bivalves Bathymodiolus puteoserpentis and Gigantidas childressi, divide within the cell nucleus, and r

The black locust tree, known botanically as Robinia pseudoacacia L., is a leguminous species belonging to the Fabaceae (legume) family. Native to North America, it is among the first exotic tree species introduced to Türkiye. It is also commonly known as “false acacia.” This species attracts attention due to its rapid growth potential, low soil requirements, resilience, and showy flowers, and is widely used for various purposes in both forestry and non-agricultural applications.Natural Distribut

Bacillus cereus is a Gram-positive, rod-shaped, motile bacterium that forms endospores. It is generally facultatively anaerobic, meaning it can grow in both aerobic and anaerobic environments. Its cell wall contains a thick layer of peptidoglycan, causing it to appear purple in Gram staining. Its spores are highly resistant and can survive for extended periods in the environment by withstanding heat, dryness, and chemicals.HistoryThis bacterium was first described in 1887 by Frankland and Frankl