Soilwater: GR+ Medium

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Soilwater: GR+ Medium Recipe

The basic garden-type soilwater; includes a pinch of CaCO3, which is added to the soil and water prior to steaming; suitable for most phototrophic freshwater algae. Optional ingredients: add vitamin B12 to cultures of Volvox; a pinch of NH4MgPO46H2O added to soilwater cultures of Botryococcus, Synechococcus and some Euglenoids enhances growth and to LB 826 Gonium pectorale increases the numbers of 16-celled colonies formed.


For 200 mL Total

  1. Combine components.
  2. 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.
  3. Refrigerate 24 hours or more and bring to room temperature before use.

# Component Amount Stock Solution Concentration Final Concentration
1 Green House Soil 1 tsp
2 CaCO3 (optional) (Fisher C 64) 1 mg 0.05 mM
3 dH2O 200 mL