| 产品名称： |
Euglena gracilis Klebs |
| 商品货号： |
TS193760 |
| Strain Designations： |
1224-5/25 CCAP 1224/5Z, Pringsheim Z, UTEX 753 |
| Biosafety Level： |
1
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 material from Saedeleer, 1950 |
| Product Format： |
frozen |
| Storage Conditions： |
Frozen: -70°C or colder for 1 week, vapor phase of liquid nitrogen for long-term storage |
| Axenic/Xenic： |
Axenic |
| Type Strain： |
no |
| Comments： |
cryopreservation photosynthetic |
| Medium： |
ATCC® Medium 351: Hutners medium for Euglena
|
| Growth Conditions： |
Temperature: 25°C |
| Cryopreservation： |
- Harvest cells from a culture which is at or near peak density by centrifuging at 100 x g for 1 minute
Note: Centrifugation at the lowest speed and the shortest time to allow sedimentation of the cells will maximize recovery.xa0
- Adjust the concentration of cells to 4 x 106/ml with fresh broth medium.
- Transfer the concentrated cell suspension to a sterile Petri dish and allow the cells to remain undisturbed for at least one hour.xa0
- Transfer the cell suspension (note the volume) from the Petri plate to a 15 ml plastic centrifuge tube.xa0
- Add an equal volume of 6% (v/v) sterile reagent grade methanol solution that has been prepared in fresh ATCC medium 351.
- Dispense in 0.5 ml aliquots into 1.0 - 2.0 ml sterile plastic screw-capped cryules (special plastic vials for cryopreservation).xa0 The time from mixing of the cell preparation and the methanol solution, before the cooling cycle begins, should be no greater than 15 min.
- 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.xa0 Place the apparatus at -80°C for 1.5 to 2 hours and then plunge ampules into liquid nitrogen.xa0 (The cooling rate in this apparatus is approximately -1°C/min.) xa0xa0
- The frozen preparations should be stored in either the vapor or liquid phase of a nitrogen refrigerator. Frozen preparations stored below -130°C are stabile indefinitely. Those stored at temperatures above -130°C are progressively less stabile as the storage temperature is elevated. Vials can be stored between -80 and -70°C for no longer than one week.
- To establish a culture from the frozen state follow steps 1-4 listed above under the heading ESTABLISHING A CULTURE FROM A FROZEN AMPULE.
|
| Name of Depositor： |
EG Pringsheim |
| Year of Origin： |
1950 |
| References： |
Hwang SW, Hudock GA. Stability of Chlamydomonas reinhardi in liquid nitrogen storage. J. Phycol. 7: 300-303, 1971.
|
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