gram positive

Edge evidence

• thick peptidoglycan cell wall retains crystal violet-iodine complex

  Thick Gram-positive cell walls retain the dye-iodine complex during decolorization.

  • DOI:10.3109/10520299609117151 cell wall ... responsible for retention Supports retention of crystal violet-iodine complex by the Gram-positive cell wall.
• wall teichoic acids embedded in thick peptidoglycan cell wall biolink:located_in

  Wall teichoic acids are major glycopolymers in the Gram-positive wall matrix.

  • DOI:10.1038/nrmicro1861 peptidoglycan-attached Supports teichoic acids as peptidoglycan-attached Gram-positive wall polymers.
• lipoteichoic acids contributes to thick peptidoglycan cell wall RO:0002326

  Lipoteichoic acids are membrane-attached glycopolymers in Gram-positive cell envelopes.

  • DOI:10.1038/nrmicro1861 membrane-attached Supports lipoteichoic acids as membrane-attached Gram-positive glycopolymers.
• alcohol decolorization fails to remove crystal violet-iodine complex

  Gram-positive cells retain dye complex after decolorization and remain purple.

  • DOI:10.3109/10520299609117151 retention of a crystal violet:iodine complex Supports retention during the Gram reaction.
• crystal violet-iodine complex produces gram positive METPO:2000202

  Retained dye complex produces the observed Gram-positive staining phenotype.

  • DOI:10.1128/jb.156.2.837-845.1983 crystal violet-iodine complex Supports the dye complex as the chemical basis of staining.
• iodine mordant causes crystal violet-iodine complex formation biolink:causes

  Iodine acts as a mordant, interacting with crystal violet to form large complexes.

  • DOI:10.52403/ijrr.20230934 When iodine is added, it interacts with CV+ to form large complexes.
• crystal violet-iodine complex formation produces crystal violet-iodine complex METPO:2000202

  Formation of the crystal violet-iodine complex retained within the peptidoglycan mesh.

  • DOI:10.1038/s42003-026-10072-8 The Gram stain relies on retention of crystal violet-iodine complexes within the peptidoglycan mesh.
• peptidoglycan mesh low porosity increases crystal violet-iodine complex RO:0002213

  Low-porosity thick peptidoglycan walls trap and retain the dye complex.

  • DOI:10.1038/s42003-026-10072-8 Crystal violet-iodine retention depends on the physical porosity of the peptidoglycan mesh; thick, low-porosity walls can trap the complex.
• D-alanine esters on teichoic acids neutralizes teichoic-acid negative charge

  D-alanine esters neutralize the phosphate-rich negative charge of teichoic acids.

  • DOI:10.1038/s41564-023-01411-0 These polymers are commonly modified with D-alanine esters that neutralize phosphate-rich negative charge.
• D-alanylation of teichoic acids increases positively charged cell surface RO:0002213

  D-alanylation of both teichoic acid types leads to a more positively charged cell surface.

  • DOI:10.1093/femsre/fuaa064 D-alanylation of both teichoic acid types leads to a more positively charged cell surface.
• wall teichoic acids influences positively charged cell surface

  Wall teichoic acids and their anionic/cationic balance affect cell-surface charge.

  • DOI:10.1146/annurev-micro-092412-155620 WTAs anionic/cationic balance affects cell-surface charge and antimicrobial interactions.