Isolation and identification of a morpholine-degrading bacterium

Area of Science:

• Microbiology
• Environmental Science
• Biotechnology

Background:

• Microbial utilization of morpholine is crucial for bioremediation.
• Isolation of novel morpholine-degrading microorganisms is essential for developing efficient biological treatment systems.

Purpose of the Study:

• To isolate and characterize a novel bacterial strain capable of utilizing morpholine as a sole source of carbon, nitrogen, and energy.
• To determine the growth characteristics and optimal conditions for the isolated strain.

Main Methods:

• Isolation of bacteria from a mixed culture in a laboratory reactor.
• Cultivation and identification of the isolated strain.
• Determination of growth kinetics (maximum specific growth rate, half-velocity constant, yield) under varying conditions.
• Optimization of temperature and pH for growth.

Main Results:

• A gram-positive, slowly growing rod was isolated and tentatively identified as Mycobacterium aurum.
• The strain effectively utilized morpholine as the sole source of organic carbon, nitrogen, and energy.
• Growth characteristics at 20°C and pH 6.5 included a maximum specific growth rate of 0.052 h⁻¹, a half-velocity constant of 1.3 mg/L, and a yield of 0.37 g/g.
• The optimum temperature and pH for growth were determined to be 31°C and 6.0, respectively.

Conclusions:

• Mycobacterium aurum is capable of morpholine degradation.
• The isolated strain demonstrates potential for biotechnological applications in morpholine-containing waste treatment.
• Understanding the growth kinetics and optimal conditions is vital for process design and efficiency.