Biosafety classification is based on U.S. Public Health Service Guidelines, it is the responsibility of the customer to ensure that their facilities comply with biosafety regulations for their own country.
Isolation
Freshwater aquarium at pet store, Rockville, MD, 1987
Product Format
frozen
Storage Conditions
Frozen Cultures: -70°C for 1 week; liquid N2 vapor for long term storage
Freeze-dried Cultures: 2-8°C
Live Cultures: See Protocols section for handling information
Type Strain
no
Comments
Structure/phylogeny of glyceraldehyde-3-phosphate dehydrogenase genes
Medium
ATCC® Medium 1171: TYGM-9 medium
Growth Conditions
Temperature: 25°C
Atmosphere: Anaerobic
Culture System: Grown with mixed bacteria from natural flora
Cryopreservation
Harvest and Preservation
Harvest the cells from a culture that is at or near peak density by centrifuging at 850 x g for 5 minutes.
If the cell concentration exceeds the required level do not centrifuge, but adjust the concentration to between 2 x 106 and 2 x 107 cells/mL with fresh medium. If the concentration is too low, centrifuge at 850 x g for 5 min and resuspend the pellet in the volume of fresh medium required to yield the desired concentration.
While cells are centrifuging prepare a 20% (v/v) solution of sterile DMSO as follows: Add the required volume of DMSO to a glass screw-capped test tube and place it in an ice bath. Allow the DMSO to solidify. Add the required volume of refrigerated medium. Dissolve the DMSO by inverting the tube several times.
*NOTE: If the DMSO solution is not prepared on ice, an exothermic reaction will occur that may precipitate certain components of the medium.
Mix the cell preparation and the DMSO in equal portions. Thus, the final concentration will be between 106 and 107 cells/mL and 10% (v/v) DMSO. The time from the mixing of the cell preparation and DMSO stock solution before the freezing process is begun should be no less than 15 min and no longer than 30 min.
Dispense in 0.5 mL aliquots into 1.0 - 2.0 mL sterile plastic screw-capped cryules (special plastic vials for cryopreservation).
Place vials in a controlled rate freezing unit. From room temperature cool at -1°C/min to -40°C. If freezing unit can compensate for the heat of fusion, maintain rate at -1°C/min through heat of fusion. At -40°C plunge ampules into liquid nitrogen. Alternatively, place the vials in a Nalgene 1°C freezing apparatus. Place the apparatus at -80°C for 1.5 to 2 hours and then plunge ampules into liquid nitrogen. (The cooling rate in this apparatus is approximately -1°C/min.)
The frozen preparations are stored in either the vapor or liquid phase of a nitrogen freezer.
To establish a culture from the frozen state place an ampule in a water bath set at 35°C (2-3 min). Immerse the vial just sufficient to cover the frozen material. Do not agitate the vial.
Immediately after thawing, aseptically remove the contents of the ampule and inoculate into 8 mL of fresh ATCC medium 1171 in a 16 x 125 screw-capped test tube. Incubate on a 15° horizontal slant at 25°C.
Name of Depositor
TA Nerad
Year of Origin
1987
References
Rozario C, et al. Primary structure and phylogenetic relationships of glyceraldehyde-3-phosphate dehydrogenase genes of free-living and parasitic diplomonad flagellates. J. Eukaryot. Microbiol. 43: 330-340, 1996. PubMed: 8768438
Morin L. Long branch attraction effects and the status of "basal eukaryotes": phylogeny and structural analysis of the ribosomal RNA gene cluster of the free-living diplomonad Trepomonas agilis. J. Eukaryot. Microbiol. 47: 167-177, 2000. PubMed: 10750846
