Chilomastix cuspidata Larsen and Patterson
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ATCC highly recommends that appropriate personal protective equipment is always used when handling vials. For cultures that require storage in liquid nitrogen, it is important to note that some vials may leak when submersed in liquid nitrogen and will slowly fill with liquid nitrogen. Upon thawing, the conversion of the liquid nitrogen back to its gas phase may result in the vial exploding or blowing off its cap with dangerous force creating flying debris. Unless necessary, ATCC recommends that these cultures be stored in the vapor phase of liquid nitrogen rather than submersed in liquid nitrogen.
1. Gently invert the test tube 10 times to evenly distribute the cells and aseptically transfer 0.5 ml from a growing culture to a 16 x 125 mm screw-capped glass test tube containing 13 ml of ATCC medium 1525 bacterized with Klebsiella pneumoniae subsp. pneumoniae (ATCC 700831).
2. Incubate at 25C on a 15 degree horizontal slant with the cap tightly sealed.
DMSO 2.0 ml
Fresh growth medium w/o bacteria 8.0 ml
2. Harvest cells from a culture that is at or near peak density by filtration and centrifugation at 800 x g for 5 min.
3. Adjust the concentration of cells at least 2 x 106/ml in fresh medium.
4. Mix the cell preparation and the cryoprotective solution in equal portions.
5. Dispense in 0.5 ml aliquots into 1.0 - 2.0 ml sterile plastic screw-capped cryules (special plastic vials for cryopreservation).
6. 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
7. Ampules are stored in either the vapor or liquid phase of a nitrogen refrigerator.
8. To establish a culture from the frozen state place the vial in a 35°C water bath. Immerse the vial to a level just above the surface of the frozen material. Do not agitate the vial.
Immediately after thawing, do not leave in water bath, aseptically remove the contents of the ampule and inoculate into a 16 x 125 mm screw-capped glass test tube containing 13 ml of ATCC medium 1525 bacterized with Klebsiella pneumoniae subsp. pneumoniae (ATCC 700831).
9. Incubate at 25C on a 15 degree horizontal slant with the cap tightly sealed.
10. Once the culture is at or near peak density, follow the protocol for maintenance of culture.
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