A generally applicable cryopreservation method for nitrite-oxidizing bacteria.

Area of Science:

• Microbiology
• Environmental Science
• Biotechnology

Background:

• Nitrite-oxidizing bacteria are crucial for the nitrogen cycle.
• Their study is limited by difficulties in cultivation and preservation.
• Lack of stable preservation methods hinders research.

Purpose of the Study:

• To develop a simple and rapid cryopreservation protocol for nitrite-oxidizing bacteria.
• To evaluate the efficacy of different cryoprotectants and media.
• To establish a reliable method for long-term storage of these bacteria.

Main Methods:

• Tested cryopreservation of Nitrobacter, Nitrospina, Nitrococcus, Nitrotoga, and Nitrospira strains.
• Evaluated cryoprotectants: dimethyl sulfoxide (DMSO) and Hatefi.
• Assessed preservation media: diluted TSB, and diluted TSB with trehalose or sucrose.

Main Results:

• Successful long-term cryopreservation was achieved for all tested genera.
• Optimal conditions varied by strain; marine strains were more sensitive.
• A general protocol using 10% DMSO with or without diluted TSB proved effective.

Conclusions:

• A simple, rapid cryopreservation protocol using DMSO is effective for diverse nitrite-oxidizing bacteria.
• This method facilitates the study and availability of these important microorganisms.
• The protocol offers a stable preservation solution for research and applications.