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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 that their cell envelope consists of a thin peptidoglycan cell wall sandwiched between an inner ( cytoplasmic ) membrane and an outer ...
Roseomonas is a genus of Gram negative bacteria. The cells are coccoid rods when viewed microscopically. The cells are coccoid rods when viewed microscopically. Certain species are known to be opportunistic infections for humans.
Providencia rettgeri (commonly P. rettgeri), is a Gram negative bacterium that is commonly found in both water and land environments. P. rettgeri is in the genus Providencia, along with Providencia stuartii, Providencia alcalifaciens, and Providencia rustigianii. P. rettgeri can be incubated at 37 °C in nutrient agar or nutrient broth.
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]
Acinetobacter is a genus of Gram-negative bacteria belonging to the wider class of Gammaproteobacteria. Acinetobacter species are oxidase-negative, exhibit twitching motility, [7] and occur in pairs under magnification. They are important soil organisms, where they contribute to the mineralization of, for example, aromatic compounds.
Stenotrophomonas is a genus of Gram-negative bacteria, [2] comprising at least twenty-six species. The main reservoirs of Stenotrophomonas are soil and plants. [ 3 ] Stenotrophomonas species range from common soil organisms ( S. nitritireducens ) to opportunistic human pathogens ( S. maltophilia ); the molecular taxonomy of the genus is still ...
Bacteroides fragilis is an anaerobic, Gram-negative, pleomorphic to rod-shaped bacterium. It is part of the normal microbiota of the human colon and is generally commensal , [ 1 ] [ 2 ] but can cause infection if displaced into the bloodstream or surrounding tissue following surgery, disease, or trauma.
Yersinia species are Gram-negative, coccobacilli bacteria, a few micrometers long and fractions of a micrometer in diameter, and are facultative anaerobes. [2] Some members of Yersinia are pathogenic in humans; in particular, Y. pestis is the causative agent of the plague .