UTEX sells Soilwater: VT Medium at 1X concentration only. Stock solutions and individual components for this specific medium are currently not available for purchase.
Soilwater: VT Medium
Freshwater Medium | 6 < pH < 8
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Deadline to place an order for Soilwater: VT Medium with a 2022 shipment date: Dec 14, 2022 at 5:00 PM CST
Soilwater: VT Medium
Soil having little or no organic content is substituted for garden-type soil; lacks supplements; for some strains of Closterium, freshwater dinoflagellates and others.
For 200 mL Total
Cover the medium container and steam for 2 consecutive days, 3 hours on each day. Pasteurization is a gradual rising of temperature to approximately 95 °C in 15 minutes. Then increased just over 98 °C for the 3 hour duration. Cooling occurs gradually at room temperature.
Refrigerate 24 hours or more and bring to room temperature before use.
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: