Acidilobus aceticus Prokofeva et al.
BAA-268 ™
BAA-268 ™
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2. Exchange gas in the Hungate test tube for 80% N2 - 20% CO2.
3. If the medium is oxidized (see discussion about resazurin below) add 0.1 ml of reducing agent (see above) to the medium and let the medium sit for 30 minutes before inoculating.
4. When the Hungate test tube is ready to be inoculated, place the frozen LN2 vial under a stream of oxygen-free gas and thaw at room temperature.
5. Using a syringe in which the dead space has been filled with an anaerobic gas mixture or reducing agent (see below), withdraw the cell suspension from vial and transfer to a single tube (5 to 6 ml) of the recommended broth. Withdraw 0.5 ml of broth from this tube and transfer it to a second tube (5 to 6 ml).
6. Over pressurize the headspace to 150 kPa using a gas mixture of 80% N2 20% CO2. Place the tubes at 80ºC.
ANAEROBIC CONDITIONS:
a. Balch tube refers to a special type of test tube that is designed to be pressurized and is suited for anaerobic work. The Balch test tubes can be purchased from Bellco Glass (www.bellcoglass.com stock no. 2048-00150).
b. 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.
c. 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.
d. Syringes can be made anaerobic by one of two methods. 1. Displace the dead space in the syringe with a sterile
Using the syringe transfer method, you must make the transfer as quickly as possible. Sometimes during transfer the medium will oxidize and turn pink (due to resazurin), however it may reduce itself back to the clear broth color during incubation. If the color does not change back, anaerobic conditions were not met and the culture will not grow.
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Prokofeva MI, et al. Acidilobus aceticus gen. nov., sp. nov., an novel anaerobic thermoacidophilic archaeon from continental hot vents in Kamchatka. Int. J. Syst. Evol. Microbiol. 50: 2001-2008, 2000. PubMed: 11155973
hot spring on Moutnovski volcano, Kamchatka peninsula