File:Pseudomonas_aeruginosa_Gram.jpg · Wikimedia Commons · See Wikimedia Commons
gram-negative bacteria
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group of bacteria that do not retain the Gram stain used in bacterial differentiation
Gram-negative bacteria are a group of bacteria that don't retain the Gram stain, a dye used to tell different types of bacteria apart under a microscope. This distinction matters because gram-negative and gram-positive bacteria have different structural properties that affect how they respond to antibiotics and other treatments.
AI-generated from the Wikipedia summary — may contain errors.
Research
980,432 papers- Epidemiology and Diagnostics of Carbapenem Resistance in Gram-negative Bacteria.Clinical infectious diseases : an official publication of the Infectious Diseases Society of America · 2019
- Carbapenemase producing Gram negative bacteria: Review of resistance and detection methods.Diagnostic microbiology and infectious disease · 2024
- Quorum sensing signal-response systems in Gram-negative bacteria.Nature reviews. Microbiology · 2016
- Newly developed antibiotics against multidrug-resistant and carbapenem-resistant Gram-negative bacteria: action and resistance mechanisms.Archives of microbiology · 2025
- Potent Antibiotics Active against Multidrug-Resistant Gram-Negative Bacteria.Chemical & pharmaceutical bulletin · 2020
via PubMed
Wikidata facts
- Subclass of
- bacteria
- Named after
- Hans Christian Gram
Show 3 more facts
- topic's main category
- Category:Gram-negative bacteria
- opposite of
- gram-positive bacteria
- Commons category
- Gram negative bacteria
via Wikidata · CC0
~14 min read
Encyclopedic overview
Microscopic image of gram-negative Pseudomonas aeruginosa bacteria (pink-red rods)
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. Their defining characteristic is that their cell envelope consists of a thin peptidoglycan cell wall sandwiched between an inner (cytoplasmic) membrane and an outer membrane. These bacteria are found in all environments that support life on Earth.
Excerpted from Wikipedia’s “gram-negative bacteria” article, available under the CC BY-SA 4.0 licence.