RESISTANCE OF BACTERIAL SPORES TO THE TRIPHENYLMETHANE DYES.

Area of Science:

• Microbiology
• Bacteriology
• Antimicrobial Agents

Background:

• Bacterial spores exhibit remarkable resistance to antimicrobial agents.
• Triphenylmethane dyes, such as gentian violet, are commonly used in microbiology.
• Understanding dye resistance in bacterial spores is crucial for effective disinfection and treatment.

Purpose of the Study:

• To investigate the resistance of bacterial spores to the bactericidal effects of triphenylmethane dyes.
• To compare the resistance of bacterial spores and vegetative cells to these dyes.
• To explore the potential for bacteria to develop resistance to dye treatments.

Main Methods:

• Exposure of Bacillus anthracis and Bacillus subtilis spores to saturated aqueous solutions of gentian violet under various temperature and time conditions.
• Testing the selective bactericidal action of dyes on vegetative cells of Gram-positive and Gram-negative bacteria.
• Assessing the bacteriostatic and bactericidal resistance variations in Bacillus anthracis vegetative cells and spores.

Main Results:

• Bacterial spores, including Bacillus anthracis and Bacillus subtilis, demonstrated significant resistance to gentian violet, even at high temperatures.
• The bactericidal action of triphenylmethane dyes was primarily effective against vegetative cells, with spores showing greater resistance.
• Bacillus anthracis exhibited increased resistance to gentian violet over time, enabling growth in previously inhibitory dye concentrations.

Conclusions:

• Bacterial spores possess inherent resistance to triphenylmethane dyes, necessitating specific strategies for their eradication.
• The development of dye resistance in pathogenic organisms is a concern, supporting the use of maximum tolerable dye concentrations.
• Frequent dye applications are recommended for preventing infections by spore-bearing bacteria due to the transient nature of dye bacteriostasis compared to spore dormancy.