Thermococcus profundus Kobayashi et al.
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2. If needed exchange the gas in the test tube for 80% N2 20% CO2.
3. If the medium is pink (see discussion about resazurin) add 2.0 ml of reducing agent (1.5% sodium sulfide, stock solution) per 100 ml of medium. Let the medium sit at room temperature for 10 to 20 minutes - until the resazurin becomes colorless - before inoculating.
4. When the Balch tube is ready to inoculate, thaw the frozen vial at room temperature under a gentle stream of oxygen free gas.
5. For inoculation, use a 1.0 ml syringe tipped with 22 gauge needle, withdraw the cell suspension from the vial and transfer it to the broth. Plate 0.1 ml of the inoculated culture onto a non-selective medium and incubate aerobically at 37oC. Use 0.1 ml of the inoculated culture to inoculate a nonselective aerobic broth. Incubate the inoculated tubes at 80oC.
6. Growth should be detected in the #1942 broth within 48 to 72 hours. There should be no growth detected on the aerobic plate or broth.
a. Resazurin is a commonly used redox indicator that is pink when the redox potential is above 50 mv., and colorless when the redox potential is below 110 mv. i.e. highly reducing. Most strict anaerobes require this low redox potential for optimum growth.
b. To obtain a fully reduced medium, it is necessary that the medium be anoxic and that a reducing agent be added. Common reducing agents are sodium sulfide, cysteine, dithiothreitol, and titanium citrate.
c. Syringes can be made anaerobic by one of two methods. 1. Displace the dead space in the syringe with a sterile
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Validation list no. 53. Int. J. Syst. Bacteriol. 45: 418-419, 1995.
Kobayashi T, et al. Thermococcus profundus sp.nov., a new hyperthermophilic archaeon isolated from a deep-sea hydrothermal vent. Syst. Appl. Microbiol. 17: 232-236, 1994.
Chung YC, et al. Purification and properties of extracellular amylase from the hyperthermophilic archaeon Thermococcus profundus DT54432. Appl. Environ. Microbiol. 61: 1502-1506, 1995.