Desulfotomaculum nigrificans derived from ATCC® 7946™*

KWIK-STIKPrepare and Use ISF (modified Infant Soy Formula) Broth using the following steps:
1. Fill tubes with 10 ml Infant Soy Formula. Infant Soy Formula may be purchased at a grocery store.
2. Place a four-penny nail in each tube. A four-penny nail is approximately 1.5 inches, or 38 mm, in length. It should contain steel or iron.
3. Sterilize the broth.
4. Inoculate ISF Broth with one LYFO DISK® or KWIK-STIK™.
5. Grow at 55°C in anaerobic conditions for 48 hours. The broth will turn grey, indicating growth.
6. Make two dilutions, 1:10 and 1:100.
7. Sub with a swab to Sulfite Agar. Plate the undiluted sample and the 1:10 and 1:100 dilutions. It is necessary to plate the diluted samples because at higher concentrations the colonies are pin-point which makes colony characteristics difficult to see. Sulfite Agar is used for detecting thermophilic anaerobes which produce sulfite.
8. Incubate the agar in anaerobic environment at 55°C for 48 hours to 7 days.

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