| 產品名稱 |
Chlorella sp. |
| 商品貨號 |
B179441 |
| Deposited As |
Chlorella pyrenoidosa Chick |
| Strain Designations |
CU 211/8b |
| Application |
Biofuel production |
| 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 |
Plant material, USA, 1923 |
| 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 |
cryopreservation photosynthetic |
| Medium |
ATCC® Medium 5: Sporulation agar
|
| Growth Conditions |
Temperature: 25°C
Culture System: Axenic |
| Cryopreservation |
Harvest and Preservation
- Harvest cells from a culture that is at or near peak density by centrifugation at 800 x g for 5 min.
- Adjust the concentration of cells to 2 x 106 - 2 x 107/mL in fresh medium.
- While cells are centrifuging prepare a 10% (v/v) solution of sterile methanol in fresh medium.
- Mix the cell preparation and the 10% methanol in equal portions. Thus, the final concentration will be 106 - 107 cells/mL and 5% (v/v) Methanol. The time from the mixing of the cell preparation and methanol stock solution to the beginning of the freezing process should be no less than 5 min and no greater than 15 min.
- Dispense in 0.5 mL aliquots into 1.0 - 2.0 mL sterile plastic screw-capped cryules (special plastic vials for cryopreservation).
- Place the vials in a controlled rate freezing unit. From room temperature cool at -1°C/min to -40°C. If the freezing unit can compensate for the heat of fusion, maintain rate at -1°C/min through the heat of fusion. At -40°C plunge 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 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 should not be stored above -55°C.
- To establish a culture from the frozen state place an ampule in a water bath set at 35°C. Immerse the vial just to a level just above the surface of the frozen material. Do not agitate the vial.
- Immediately after thawing, do not leave in the water bath, aseptically remove the contents of the ampule and add to a centrifuge tube containing 5 mL of ATCC medium 5 without agar. Centrifuge at 300 x g for 5 min.
- Remove most of the supernatant (=methanol, which can inhibit growth) and then resuspend the pellet. Transfer the culture to a 16 x 125 mm screw-capped test tube containing 5 mL of ATCC medium 5 broth or to the surface of an ATCC medium 5 agar plate (20 x 100 mm Petri plate containing 20 mL of ATCC medium 5 agar).
- Incubate the culture at 50-100 µEinsteins/m2/s irradiance at 25°C. Maintain under a 14/10h light-dark photoperiod.
|
| Name of Depositor |
RW Krauss |
| Chain of Custody |
ATCC <-- RW Krauss <-- ... <-- Emerson |
| Year of Origin |
1923 |
| References |
Hwang SW, Hudock GA. Stability of Chlamydomonas reinhardi in liquid nitrogen storage. J. Phycol. 7: 300-303, 1971.
Hwang SW, Horneland W. Survival of algal cultures after freezing by controlled and uncontrolled cooling. Cryobiology 1: 305-311, 1965. PubMed: 5872223
|
