Ulothrix gigas (Vischer) Mattox and Bold (ATCC® 30443)

Organism: Ulothrix gigas (Vischer) Mattox and Bold  /  Depositor: UTEX

Deposited As Uronema gigas Vischer
Strain Designations UTEX 174 [CCAP-386/3]
Application
algal resistance testing paint
Biosafety Level 1
Isolation
freshwater, Switzerland, 1930
Product Format frozen
Type Strain no
Comments
This strain is recommended by ATCC for use in the tests described in ASTM Standard Test Method E1366-91 where only the taxon is specified.
photosynthetic
Medium Medium 847: Algal proteose agar
Growth Conditions
Temperature: 25.0°C
Duration: axenic
Cryopreservation

1.  Harvest cells from a culture that is at or near peak density by centrifugation at 800 x g for 5 min.

2.  Adjust the concentration of cells to 2 x 106 - 2 x 107/ml in fresh broth medium.

3.  While cells are centrifuging prepare a 14% (v/v) solution of sterile DMSO in fresh broth medium.

4. Mix the cell preparation and the 14% DMSO in equal portions. Thus, the final concentration will be 106 - 107 cells/ml and 7% (v/v) DMSO. The time from the mixing of the cell preparation and DMSO stock solution to the beginning of the freezing process should be no less than 5 min and no greater than 15 min.

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 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.)  

7.  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.

8.   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.

9.   Immediately after thawing, do not leave in the water bath, aseptically remove the contents of the ampule and inoculate a 16 x 125 mm screw-capped test tube containing 5 ml of ATCC medium 847 broth.

10.          Incubate the culture on a 15° horizontal slant at 25°C with the cap screwed on loosely (loosened one-half turn) and incubate under a 14 hour light (~50 mEinsteins/m2/s irradiance)/10 hour dark cycle.

Name of Depositor UTEX
Chain of Custody
ATCC <<--UTEX<<--. . . <<--- W. Vischer strain 69
Year of Origin 1930
References

Starr RC. The culture collection of algae at Indiana University. Am. J. Bot. 51: 1013-1044, 1964.

Standard Test Method for Determining the Resistance of Paint Films and Related Coatings to Algal Defacement. West Conshohocken, PA:ASTM International;ASTM Standard Test Method D 5589-97 (Reapproved 2002).