UTEX sells Soilwater: GR-/NH4 Medium at 1X concentration only. Stock solutions and individual components for this specific medium are currently not available for purchase.
Soilwater: GR-/NH4 Medium
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$ 60.00
Deadline to place an order for Soilwater: GR-/NH4 Medium with a 2025 shipment date :
Wed, Dec 10, 2025 at 5:00 PM CST
Soilwater: GR-/NH4 Medium
A garden-type soilwater without supplements. Suitable for Spirogyra, Zygnema and a few other phototrophic algae.
Directions
For 200 mL Total (pH 7.3)
- Prepare Soilwater: GR- Medium
- Add pinch of NH4MgPO4•6H2O after pasteurizing.
| # | Component | Amount | Stock Solution Concentration | Final Concentration |
|---|---|---|---|---|
| 1 | Soilwater: GR- Medium | 200 mL | ||
| 2 | NH4MgPO4 (Sigma 529354) |
1 mg | 0.04 mM |
Important Notes To Consider:
- The quality of water, including natural seawater, is important. The term 'dH2O' generally refers to distilled, deionized, distilled/deionized water, Milli-Q water (Millipore Corp.), etc. Natural seawater and natural freshwater should be obtained from a non-polluted source.
- When dissolving chemicals, wait for the first component to dissolve before adding the second. Stirring, and sometimes the addition of heat, is often required to dissolve the chemicals efficiently. Preparation of stock solutions for frequently made algal culture media make preparing media convenient but also necessary to avoid errors from weighing very tiny amounts.
- Attention should be given to the pH of the final medium. In most cases, if pH adjustment is required, this occurs before sterilization. Please note that autoclaving removes carbon dioxide from media lacking carbonate stabilizing buffers. This would make the medium very alkaline soon after removal from the autoclave. In these cases, you should wait approximately 24 hours for gaseous equilibrium before inoculating the medium.
Additional algal culture media recipes can be found at the following other major Collections' websites:
- Culture Collection of Algae and Protozoa (CCAP)
- National Center for Marine Algae and Microbiota (NCMA)
- National Institute for Environmental Studies (NIES) Microbial Culture Collection
- The Pasteur Culture Collection of Cyanobacteria (PCC)
- The Culture Collection of Algae at Goettingen University (SAG)
- Canadian Phycological Culture Centre (CPCC)
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