Gram positives

‘Gram positives’

a PHYLUM (potentially of KINGDOM status) of the DOMAIN BACTERIA. see CLASSIFICATION. Most members are distinguished by their Gram-positive (see GRAM'S STAIN) CELL WALL. ORGANISMS within this group include ACTINOMYCETES, BACILLUS species, LACTOBACILLUS species, STREPTOCOCCUS species, Clostridium species and the photosynthetic bacterium Heliobacterium.
References in periodicals archive ?
Statistical analysis for Gram Positives: The use-fulness of all drugs was calculated against Gram Posi-tive isolates.
Overall, 84 isolates were available for analysis, 61/84 were Gram negative rods whereas 8/84 were Gram positive cocci.
Based on Catalase test react-ions, the Gram positive cocci were divided into either Staphylococci or Streptococci/Enterococci.
Gram positives predominated in our set of patients, and there was drift in bacteriology from Pseudomonas sp.
Gram positives were seen in 65% of cases, while gram negatives in 31% of cases.
The majority of gram positives (65/75) were seen in the safe ears.
All cotrimaxalole resistant gram positives were sensitive vancomycin, tetracycline and linezolid.
A bacterial count of 1x[10.sup.4] / ml was considered significant for gram positive organisms.
Both gram negative and gram positive isolates were resistant to Ciprofloxacin (11/15), Cefepime (8/15), Amoxyclav (9/15), Cotrimaxazole (9/15) and Gentamicin (4/15).
Experts note that "only thick walled organisms can be Gram-positive because the wall acts as a permeability barrier restricting diffusion of the crystal violet:mordant complex." [7] The peptidoglycan layer in Gram positives is, on average, 10-15 times thicker than that in Gram negatives.
This explanation is supported by the observation that damage to the cell wall caused by prolonged exposure to solvents, in addition to the age of the organism and use of antibiotics, will cause Gram positives to stain Gram negative.
Though the final color of both Gram positives and Gram negatives is altered slightly, this step results in better contrast between Gram negatives and background material, making organisms easier to detect.