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Gram-negative bacteria are bacteria that, unlike gram-positive bacteria, do not retain the crystal violet stain used in the Gram staining method of bacterial differentiation. [1] Their defining characteristic is their cell envelope, which consists of a thin peptidoglycan cell wall sandwiched between an inner (cytoplasmic) membrane and an outer ...
Enterobacteriaceae. Rahn, 1937. Genera [1] See text. Enterobacteriaceae is a large family of Gram-negative bacteria. It includes over 30 genera and more than 100 species. Its classification above the level of family is still a subject of debate, but one classification places it in the order Enterobacterales of the class Gammaproteobacteria in ...
A Gram stain of mixed Staphylococcus aureus (S. aureus ATCC 25923, gram-positive cocci, in purple) and Escherichia coli (E. coli ATCC 11775, gram-negative bacilli, in red), the most common Gram stain reference bacteria. Gram stain (Gram staining or Gram's method), is a method of staining used to classify bacterial species into two large groups ...
Carbapenem-resistant Enterobacteriaceae (CRE) or carbapenemase-producing Enterobacteriaceae (CPE) are gram-negative bacteria that are resistant to the carbapenem class of antibiotics, considered the drugs of last resort for such infections. They are resistant because they produce an enzyme called a carbapenemase that disables the drug molecule.
Proteus is a genus of Gram-negative bacteria. It is a rod shaped, aerobic and motile bacteria, which is able to migrate across surfaces due its “swarming” characteristic in temperatures between 20 and 37 °C. [1] Their size generally ranges from 0.4 to 0.8 μm in diameter and 1.0–3.0 μm in length. They tend to have an ammonia smell. [2]
However, some gram-positive bacteria may also have a capsule: Bacillus megaterium for example, synthesizes a capsule composed of polypeptide and polysaccharides. Bacillus anthracis; Streptococcus pyogenes synthesizes a hyaluronic acid capsule. Streptococcus pneumoniae [20] has at least 91 different capsular serotypes. [21]
Fusobacterium is a genus of obligate anaerobic, Gram-negative, [ 2 ] non-sporeforming bacteria [ 3 ] belonging to Gracilicutes. Individual cells are slender, rod-shaped bacilli with pointed ends. [ 4 ][ 5 ]Fusobacterium was discovered in 1900 by Courmont and Cade and is common in the flora of humans. [ 6 ][ 7 ] Strains of Fusobacterium can ...
Bacteroides is a genus of Gram-negative, obligate anaerobic bacteria. Bacteroides species are non endospore -forming bacilli, and may be either motile or nonmotile, depending on the species. [3] The DNA base composition is 40–48% GC. Unusual in bacterial organisms, Bacteroides membranes contain sphingolipids.