BACILLUS PYOCYANEUS AND ITS PIGMENTS.

Area of Science:

• Microbiology
• Bacteriology
• Biochemistry

Background:

• Pseudomonas aeruginosa (B. pyocyaneus) is known to produce pigments.
• The relationship between fluorescent pigment production and pyocyanin production in B. pyocyaneus requires further elucidation.

Purpose of the Study:

• To investigate the conditions governing pigment production in B. pyocyaneus.
• To differentiate B. pyocyaneus varieties based on pigment production.
• To understand the stability and variability of pigment production.

Main Methods:

• Cultivation of B. pyocyaneus under various conditions.
• Observation and characterization of pigment formation (fluorescence and pyocyanin).
• Oxidation studies of pigments.
• Classification of bacterial varieties based on pigmentogenic and fluorescigenic powers.

Main Results:

• Fluorescent pigment production by B. pyocyaneus occurs under similar conditions as in other fluorescent bacteria.
• Pyocyanin production is independent of phosphate, sulfate, and proteid content of the medium, and not tied to all metabolic activities.
• Pyocyanin production is lost more readily than fluorescence during artificial cultivation, with significant natural and acquired variations in pyocyanogenic power.
• Both pigments can be oxidized to different colored products (yellow from fluorescent, black from pyocyanin).
• B. pyocyaneus can be classified into four varieties: alpha (both pigments), beta (pyocyanin only), gamma (fluorescence only), and delta (non-chromogenic).
• These varieties show limited plasticity and are not easily converted into one another.

Conclusions:

• B. pyocyaneus pigment production, specifically pyocyanin and fluorescence, is governed by distinct but related factors.
• The stability of pyocyanin production is lower than that of fluorescence, leading to distinct bacterial varieties.
• Further research is needed to correlate chromogenic variations with other physiological functions of B. pyocyaneus.