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Micriamoeba tesseris

PRA-369

Product category
Protists
Classification
Micriamoebae
Strain designation
tmp4
Type strain
Yes
Isolation source
Hospital cooling tower
Geographical isolation
France; Auvergne-Rhone-Alpes; Lyon
Product format
Frozen
Storage conditions
-80°C or colder for 1 week, vapor phase of liquid nitrogen for long-term storage
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Documentation

ATCC determines the biosafety level of a material based on our risk assessment as guided by the current edition of Biosafety in Microbiological and Biomedical Laboratories (BMBL), U.S. Department of Health and Human Services. It is your responsibility to understand the hazards associated with the material per your organization’s policies and procedures as well as any other applicable regulations as enforced by your local or national agencies.

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.

Required Products

These products are vital for the proper use of this item and have been confirmed as effective in supporting functionality. If you use alternative products, the quality and effectiveness of the item may be affected.

Detailed product information

Characteristics

Comments
This axenic culture must be fed with heat-killed Escherichia coli bacteria (ATCC® 23740™ or similar).

Handling information

Medium
Instruction for complete medium
Fed with heat-killed Escherichia coli bacteria (ATCC® 23740™ or similar)
Temperature
20-25°C
Atmosphere
Aerobic
Culture system
Axenic
Handling procedure
Storage and Culture Initiation
Frozen ampules packed in dry ice should either be thawed immediately or stored in liquid nitrogen.  If liquid nitrogen storage facilities are not available, frozen ampules may be stored at or below -70°C for approximately one week.  Do not under any circumstance store frozen ampules at refrigerator freezer temperatures (generally -20°C).  Storage of frozen material at this temperature will result in the death of the culture.
  1. To thaw a frozen ampule, place it in a 35°C water bath such that the lip of the ampule remains above the water line. Thawing time is approximately 2 to 3 minutes.  Do not agitate the ampule.  Do not leave ampule in water bath after it is thawed.
  2. Immediately after thawing, aseptically transfer the entire contents to a T-25 flask containing 10 mL complete medium. 
  3. Add 0.1 to 0.5 mL from a preparation of heat-killed Escherichia coli bacteria (ATCC® 23740™ or similar).  The quantity of the food-source bacteria to be added will depend on the density of the heat-killed bacterial suspension and the desired rate of growth for Micriamoeba, and should be determined empirically.
  4. Incubate with the cap tightly sealed at 20-25°C.
Handling notes
This axenic culture must be fed with heat-killed Escherichia coli bacteria (ATCC® 23740™ or similar).
Culture maintenance
Subculture at peak density (approximately every 7-14 d) to a fresh T-25 flask of complete medium in the following manner:
  1. Vigorously agitate the flask and aseptically transfer 0.25 mL to a T-25 tissue culture flask containing 10 mL complete medium.
  2. Add 0.1 to 0.5 mL from a preparation of heat-killed Escherichia coli bacteria (ATCC® 23740™ or similar).  The quantity of the food-source bacteria to be added will depend on the density of the heat-killed bacterial suspension and the desired rate of growth for Micriamoeba, and should be determined empirically.
  3. Incubate with the cap tightly sealed at 20-25°C.
Reagents for cryopreservation
Reagents
Cryoprotective Solution
DMSO, 1.5 mL
Fresh complete growth medium, 8.5 mL

Cryopreservation
  1. To achieve the best results, set up cultures with several different inocula (i.e., 0.25 mL, 0.5 mL, 1.0 mL).  Harvest cultures and pool when the culture that received the lowest inoculum is at or near peak density.
  2. If the cell concentration exceeds the required level do not centrifuge, but adjust the concentration to between 2 x 106 and 2 x 107cells/mL with fresh growth medium.  If the concentration is too low, centrifuge at 1200 to 1600 x g for 5 min and resuspend the pellet in the volume of fresh medium required to yield the desired concentration.
  3. While cells are centrifuging prepare a 15% (v/v) solution of sterile DMSO as follows:  Add the required volume of DMSO to a glass screw-capped test tube and place it in an ice bath.  Allow the DMSO to solidify.  Add the required volume of refrigerated medium.  Dissolve the DMSO by inverting the tube several times.  Note: If the DMSO solution is not prepared on ice, an exothermic reaction will occur that may precipitate certain components of the medium.
  4. Mix the cell preparation and the DMSO in equal portions. Thus, the final concentration will be between 106 and 107 cells/mL and 7.5% (v/v) DMSO. The time from the mixing of the cell preparation and DMSO stock solution to the start of the freezing process should be no less than 15 min and no longer than 30 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 are stored in either the vapor or liquid phase of a nitrogen freezer.
  8. To establish a culture from the frozen state, place an ampule in a 35°C water bath (2-3 min). Immerse the vial just sufficiently to cover the frozen material. Do not agitate the vial.
  9. Immediately after thawing, aseptically remove the contents of the ampule and inoculate into 10 mL complete medium in a T-25 flask.
  10. Add 0.1 to 0.5 mL from a preparation of heat-killed Escherichia coli bacteria (ATCC® 23740™ or similar).
  11. Incubate with the cap tightly sealed at 20-25°C.
  12. Follow the protocol for maintenance of culture.

History

Deposited as
Micriamoeba tesseris
Depositors
M Pelandakis
Chain of custody
ATCC <-- M Pelandakis, Univ. Claude Bernard, Lyon, France
Year of origin
2007
Cross references
GenBank FN562429.1 Amoebozoa sp. Tmp4 partial 18S rRNA gene, isolate Tmp4

Legal disclaimers

Intended use
This product is intended for laboratory research use only. It is not intended for any animal or human therapeutic use, any human or animal consumption, or any diagnostic use.
Warranty

The product is provided 'AS IS' and the viability of ATCC® products is warranted for 30 days from the date of shipment, provided that the customer has stored and handled the product according to the information included on the product information sheet, website, and Certificate of Analysis. For living cultures, ATCC lists the media formulation and reagents that have been found to be effective for the product. While other unspecified media and reagents may also produce satisfactory results, a change in the ATCC and/or depositor-recommended protocols may affect the recovery, growth, and/or function of the product. If an alternative medium formulation or reagent is used, the ATCC warranty for viability is no longer valid.  Except as expressly set forth herein, no other warranties of any kind are provided, express or implied, including, but not limited to, any implied warranties of merchantability, fitness for a particular purpose, manufacture according to cGMP standards, typicality, safety, accuracy, and/or noninfringement.

Disclaimers

This product is intended for laboratory research use only. It is not intended for any animal or human therapeutic use, any human or animal consumption, or any diagnostic use. Any proposed commercial use is prohibited without a license from ATCC.

While ATCC uses reasonable efforts to include accurate and up-to-date information on this product sheet, ATCC makes no warranties or representations as to its accuracy. Citations from scientific literature and patents are provided for informational purposes only. ATCC does not warrant that such information has been confirmed to be accurate or complete and the customer bears the sole responsibility of confirming the accuracy and completeness of any such information.

This product is sent on the condition that the customer is responsible for and assumes all risk and responsibility in connection with the receipt, handling, storage, disposal, and use of the ATCC product including without limitation taking all appropriate safety and handling precautions to minimize health or environmental risk. As a condition of receiving the material, the customer agrees that any activity undertaken with the ATCC product and any progeny or modifications will be conducted in compliance with all applicable laws, regulations, and guidelines. This product is provided 'AS IS' with no representations or warranties whatsoever except as expressly set forth herein and in no event shall ATCC, its parents, subsidiaries, directors, officers, agents, employees, assigns, successors, and affiliates be liable for indirect, special, incidental, or consequential damages of any kind in connection with or arising out of the customer's use of the product. While reasonable effort is made to ensure authenticity and reliability of materials on deposit, ATCC is not liable for damages arising from the misidentification or misrepresentation of such materials.

Please see the material transfer agreement (MTA) for further details regarding the use of this product. The MTA is available at www.atcc.org.

Permits & Restrictions

Import Permit for the State of Hawaii

If shipping to the U.S. state of Hawaii, you must provide either an import permit or documentation stating that an import permit is not required. We cannot ship this item until we receive this documentation. Contact the Hawaii Department of Agriculture (HDOA), Plant Industry Division, Plant Quarantine Branch to determine if an import permit is required.

MORE INFORMATION ABOUT PERMITS AND RESTRICTIONS

Frequently Asked Questions

References

Curated Citations

Atlan D, et al. Micriamoeba tesseris nov. gen. nov. sp.: a new taxon of free-living small-sized amoebae non-permissive to virulent Legionellae. Protist 163(6): 888-902, 2012. PubMed: 22677099

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