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Tetrahymena thermophila Nanney and McCoy (ATCC® 30382)

Strain Designations: B-18684  /  Depositor: EM Simon, DL Nanney  /  Biosafety Level: 1

Permits and Restrictions

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Strain Designations B-18684
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 Not available
Product Format test tube
Storage Conditions Frozen: -70°C or colder
Freeze-Dried: 2°C to 8°C
Live Culture: See Protocols Section
Type Strain no
WH-6 X WH-14, Urbana, IL, 1950 (?)
One of a set of related inbred stocks. Designations provide information about the history and mating type. For example, strain A-17682a has the mating type allele A, is the 17th generation of inbreeding, the last inbreeding cross was made in 1968, and this line is mating type II (2). The lower case letter (a) indicates that more than one line of the particular mating type was kept from the cross, and the letter identifies the line.
use of plastic ampoules for freeze preservation
Medium ATCC® Medium 357: Tetrahymena medium
ATCC® Medium 1034: Modified PYNFH medium (Available from ATCC as ATCC cat. no. 327-X)
ATCC® Medium 383: Haskins agar for Tetrahymena
Growth Conditions
Temperature: 25°C
Culture System: Axenic
Cryopreservation Reagents
RM-9 Media for cryopreservation of Tetrahymena
Proteose Peptone (Difco 0120), 5.0 g
Tryptone, 5.0 g
K2HPO4, 0.2 g
Glucose, 1.0 g
Liver extract, 0.1 g
Glass distilled water, 1.0 L
Dissolve components in glass distilled H2O and autoclave.

Dryl’s Salt Solution
0.1 M NaH2PO4 . 3H20, 10.0 mL
0.1 M Na2HPO4 . 7H20, 10.0 mL
0.1 M Sodium citrate . 2H20, 15.0 mL
0.1 M CaCl2 . 2H20, 15.0 mL
Distilled water 950.0, mL
Add the first 3 components to the distilled H2O and mix thoroughly.
Add the CaCl2 solution and mix thoroughly.
(Adding the solutions in the order indicated will avoid the precipitation of Ca salts.)

Harvest and Preservation
  1. Transfer tetrahymena from usual growth medium to RM-9 medium and allow to grow to near peak density.
  2. Harvest cells from a culture by centrifugation at 300 x g for 2 min.          
  3. Adjust concentration of cells to 2 x 106/mL in fresh medium.
  4. While cells are centrifuging, prepare a 22% (v/v) sterile solution of sterile DMSO in fresh medium.
    1. Add 2.2 mL of DMSO to an ice cold 20 x 150 mm screw-capped test tube;
    2. Place the tube on ice and allow the DMSO to solidify (~5 min) and then add 7.8 mL of ice cold medium;
    3. Invert several times to dissolve the DMSO;
    4. Allow to warm to room temperature.
  5. Add a volume of the DMSO solution equal to the cell suspension volume but add in 3 equal aliquots at 2 min intervals. Thus, the final concentration of the preparation will equal 11% (v/v) DMSO and 106 cells /mL.
  6. Dispense in 0.5 mL aliquots into 1.0 - 2.0 mL sterile plastic screw-capped cryules (special plastic vials for cryopreservation).
  7. Place the ampules in a controlled rate freezing unit. The cooling cycle should be initiated no less than 15 min and no longer than 60 min after the addition of the DMSO to the cell preparation. 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  -50°C ampules are plunged into liquid nitrogen.
  8. Store in the vapor or liquid phase of a nitrogen refrigerator.
  9. To establish a culture from the frozen state aseptically add 0.5 mL sterile Dryl's Salt Solution to an ampule. Immediately place the ampule in a 35°C water bath, until thawed (2-3 min).  Immerse the ampule just sufficient to cover the frozen material. Do not agitate the ampule.
  10. Immediately after thawing, aseptically remove the contents of the ampule and inoculate into 5.0 mL of fresh medium in a 16 x 125 mm screw-capped test tube with a slightly loosened cap. Incubate at 25°C.
Name of Depositor EM Simon, DL Nanney
Chain of Custody
ATCC <-- EM Simon, DL Nanney <-- S.L. Allen

Borden D, et al. The inheritance of enzyme variants for tyrosine aminotransferase, NADP dependent malate dehydrogenase, NADP dependent isocitrate dehydrogenase and tetrazolium oxidase in Tetrahymena pyriformis syngen 1. Genetics 74: 595-603, 1974.

Simione FP Jr., et al. The use of plastic ampoules for freeze preservation of microorganisms. Cryobiology 14: 500-502, 1977. PubMed: 891238

Nanney DL, et al. Comparison of sequence differences in a variable 23S rRNA domain among sets of cryptic species of ciliated protozoa. J. Eukaryot. Microbiol. 45: 91-100, 1998. PubMed: 9495037

8310 C: Chemotactic test with freshwater ciliate Tetrahymena thermophila. Washington, DC:American Public Health Association;Standard Methods for the Examination of Water and Wastewater, 2005 APHA8310 - Ciliated Protozoa;.

Notice: Necessary PermitsPermits

These permits may be required for shipping this product:

  • Customers located in the state of Hawaii will need to contact the Hawaii Department of Agriculture to determine if an Import Permit is required. A copy of the permit or documentation that a permit is not required must be sent to ATCC in advance of shipment.
Basic Documentation