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The 36 pages that link to Gram-negative bacteria, each with the reason it gives.

• PeptidoglycanCompared with: Their outer membrane changes how peptidoglycan is exposed and how antibiotics reach it.

• Gram-positive bacteriaCompared with: Their outer membrane and thin wall create the contrasting stain result.

• Bacterial cell wallBroader topic: Their wall occupies the periplasm, beneath an additional outer membrane.

• Escherichia coliNarrower topic: E. coli belongs to this group, whose outer membrane shapes its staining and interactions with hosts.

• Cell wallBroader topic: Their wall architecture contrasts with the thick peptidoglycan layer of Gram-positive bacteria.

• Pseudomonas aeruginosaNarrower topic: P. aeruginosa belongs to this broad bacterial group.

• LipopolysaccharideNarrower topic: This bacterial group is characterized by an outer membrane that commonly contains LPS.

• CephalosporinRelated: Later cephalosporins often have expanded activity against these bacteria.

• ChlorhexidineCompared with: Their outer membrane can reduce chlorhexidine penetration compared with many Gram-positive bacteria.

• Gram stainBroader topic: They are decolorized and then appear pink or red after counterstaining.

• LysozymeCompared with: Their outer membrane can shield peptidoglycan from lysozyme unless that barrier is disrupted.

• EndotoxinNarrower topic: Their outer membrane is the principal bacterial source of endotoxin.

• Neisseria meningitidisNarrower topic: Its outer membrane shapes meningococcal structure, immune recognition, and antibiotic susceptibility.

• SalmonellaRelated: Salmonella has the cell-envelope structure characteristic of this group.

• Bacterial cell envelopeBroader topic: Their outer membrane and thin wall create a distinct multilayered envelope.

• Penicillin GCompared with: The outer membrane limits Penicillin G entry into many Gram-negative species.

• Vibrio choleraeNarrower topic: V. cholerae’s outer membrane shapes its interaction with hosts and environmental stress.

• ShigellaNarrower topic: Shigella belongs to this bacterial group and has its characteristic outer membrane.

• Bacterial morphologyCompared with: Gram reaction distinguishes wall structure rather than morphology.

• BacteroidotaNarrower topic: Bacteroidota members share the broad envelope classification described by this group.

• AztreonamRelated: Aztreonam’s clinical activity is concentrated on susceptible members of this group.

• Crystal violetRelated: They initially take up crystal violet but are counterstained after the dye complex is removed.

• ActinomycetotaCompared with: Their outer membrane distinguishes them from the classic Gram-positive actinomycetotan cell plan.

• Bacterial cell structureBroader topic: Their additional outer membrane distinguishes their envelope from Gram-positive cells.

• SafraninRelated: They typically appear pink or red after safranin counterstaining in Gram staining.

• VibrioNarrower topic: Vibrio belongs to this broad bacterial group and has its characteristic outer membrane.

• Bacteroides fragilisNarrower topic: B. fragilis has the outer membrane and staining behavior characteristic of this group.

• CefotaximeRelated: Cefotaxime's expanded activity against many members of this group shaped its clinical use.

• Legionella pneumophilaNarrower topic: L. pneumophila belongs to this broad bacterial group.

• NeisseriaNarrower topic: Neisseria belongs to this broad bacterial group, whose outer membrane shapes its biology.

• PseudomonadotaNarrower topic: Pseudomonadota share this defining envelope architecture.

• Aliivibrio fischeriNarrower topic: A. fischeri has the cell-envelope structure characteristic of Gram-negative bacteria.

• ChlamydiotaRelated: Chlamydial cell envelopes share key features with Gram-negative bacteria despite atypical staining.

• FosfomycinRelated: Their outer membrane and drug-entry systems influence fosfomycin activity and resistance.

• SpheroplastBroader topic: Their multiple envelope layers make the term spheroplast especially relevant.

• PilusRelated: Many well-studied pili cross this two-membrane envelope during assembly.