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Bacillota (synonym Firmicutes) is a phylum of bacteria, most of which have gram-positive cell wall structure. [2] The renaming of phyla such as Firmicutes in 2021 remains controversial among microbiologists, many of whom continue to use the earlier names of long standing in the literature.
Gracilicutes (gram-negative, it is split in many groups, but some authors still use it in a narrower sense) Firmacutes [sic] (gram-positive, subsequently corrected to Firmicutes, [4] today it excludes the Actinomycetota) Mollicutes (gram variable, later renamed Tenericutes and now Mycoplasmatota, e.g. Mycoplasma)
Eubacterium eligens is a member of the Bacillota (previously Firmicutes) phylum, which is one of two phyla which constitute more than 90% of microflora in the human gut. [4] [5] Characteristics of this phylum include low GC content in the DNA and Gram-positivity. [2]
Scotobacteria (non-photosynthetic, now the Proteobacteria and other gram-negative nonphotosynthetic phyla) Firmacutes [sic] (gram-positive, subsequently corrected to Firmicutes [43]) several orders such as Bacillales and Actinomycetales (now in the phylum Actinobacteria) Mollicutes (gram variable, e.g. Mycoplasma)
Roseburia is a genus of butyrate-producing, Gram-positive anaerobic bacteria that inhabit the human colon. Named in honor of Theodor Rosebury, they are members of the phylum Bacillota (formerly known as Firmicutes). [2] [3] Increased abundance of Roseburia is associated with weight loss and reduced glucose intolerance in mice. [4]
Many well-studied phyla of bacteria are diderms and stain gram-negative, whereas well-known monoderms that stain Gram-positive include Firmicutes (or Bacillota) (low G+C gram-positives), Actinomycetota (high-G+C gram-positives) and Deinococcota (gram-positive diderms with thick peptidoglycan).
Gram-negative Gracilicutes, with a thin cell wall and little peptidoglycan; Gram-positive Firmicutes, with a thicker cell wall and more peptidoglycan (the name was later changed in "Firmicutes"), and; the "Mollicutes", without a cell wall. [9]
Many works have implicated that the Negativicutes should be reclassified as an order within the class Clostridia, based on close phylogenetic branching, and the observation that the spore-forming members of the Negativicutes share similar sporulation genes as the Clostridia, and that both stain gram-negative.