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Updated: May 21, 2026

A Microscopic Phenotypic Assay for the Quantification of Intracellular Mycobacteria Adapted for High-throughput/High-content Screening
Published on: January 17, 2014
[Ultrastructural changes in cells of mycobacteria affected by flurenizid derivatives]
Abstract:
In cells of micobacteria of all investigated samples the following ultrastructural changes were observed: disorganization of a nucleoid and citoplasm, formation of the citoplasmic vacuoles and endocellular lipide-like inclusions, and also change of the cells form into spheroid and formeless mass, disappearance of periplasmatic space, occurrence of cells of small-size and short incompletely divided cells in the samples. They were observed more often after 72 hours of exposition of the cultures with antibacterial substances, than after 24 hours of exposition. The highest concentration of these substances being used, the ultrastructural changes were more essential. No significant difference between the nature of changes in the structure of cells studied using antibacterial substances has been found.
Insights
Antibacterial substances cause significant ultrastructural changes in mycobacteria, including cell disorganization and morphological alterations. These effects intensify with longer exposure and higher concentrations.
Area of Science:
- Microbiology
- Cell Biology
- Bacteriology
Context:
- Investigating the impact of antibacterial substances on mycobacterial cell structure.
- Observing ultrastructural changes in mycobacteria under varying exposure times and concentrations.
Purpose:
- To document and analyze the morphological and ultrastructural alterations in mycobacteria induced by antibacterial agents.
- To compare the effects of different exposure durations and concentrations of antibacterial substances on mycobacterial cells.
Summary:
- Exposure to antibacterial substances induced significant ultrastructural changes in mycobacteria, including nucleoid and cytoplasm disorganization, vacuole formation, and altered cell morphology.
- Observed changes were more pronounced after 72 hours compared to 24 hours and intensified with increasing substance concentrations.
- No significant differences were noted in the nature of changes across different antibacterial substances tested.
Impact:
- Provides detailed insights into the cellular mechanisms of antibacterial action against mycobacteria.
- Contributes to understanding mycobacterial susceptibility and potential resistance pathways.
- Informs the development of novel antibacterial strategies targeting mycobacterial ultrastructure.
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