05/30/2026
Living Rock
Sand, Urea Fertilizer, Calcium Chloride, Sporosarcina Pasteurii
how to make Sporosarcina PasteuriiTo "make" Sporosarcina pasteurii, you do not synthesize it from scratch; rather, you obtain a starter culture from a biological repository and grow (culture) it in a highly alkaline, urea-rich nutrient environment. Because it requires strict sterile techniques and specialized equipment like autoclaves and laminar flow hoods, this process must be conducted in a standard microbiology laboratory.The standard laboratory protocol involves three major stages:1. Procuring the Starter StrainSource: Purchase a pure, authenticated freeze-dried pellet of Sporosarcina pasteurii (commonly strain ATCC 11859 or DSM 33) from official repositories like the ATCC or the DSMZ.Safety: It is classified as a Biosafety Level 1 (BSL-1) organism, meaning it is non-pathogenic and safe to handle under standard laboratory precautions.2. Preparing the Growth Medium (NH₄-YE or Urea Medium)S. pasteurii is alkaliphilic and thrives at a high pH (typically 9.0). It requires ammonium ions or urea to grow effectively.Standard Recipe per Liter of Distilled Water:Yeast Extract or Nutrient Broth: 20 grams (provides essential organic nutrients and vitamins).Ammonium Sulfate (\((NH_4)_2SO_4\)): 10 grams (or substitute with 20 grams of Urea to selectively induce urease activity).Tris Base: 15.75 grams (acts as a chemical buffer to maintain high alkalinity).Sterilization Trick (Critical Step):The Problem: You cannot autoclave urea because high heat decomposes it.The Solution: Dissolve the yeast extract and Tris base in water, adjust the pH to 9.0–9.2 using hydrochloric acid (HCl) or sodium hydroxide (NaOH), and sterilize it in an autoclave at 121°C for 20 minutes.Dissolve the urea separately in a small volume of water, push it through a 0.22 µm sterile syringe filter, and mix it into the autoclaved medium only after it cools down to room temperature.3. Culturing and InoculationRehydration: Inside a sterile laminar flow hood, open the strain vial and use a sterile pipette to add 1 mL of your prepared liquid broth to the freeze-dried pellet. Mix gently to dissolve.Plating: Streak a few drops of the rehydrated mixture onto solid agar plates containing the same media formulation if you want to grow individual colonies.Liquid Expansion: Transfer the rest of the mixture into an Erlenmeyer flask filled with your liquid growth medium.Incubation: Place the flask into an incubator shaker set to 30 °C and agitate it at 120 to 200 rpm. Agitation is vital because the bacterium is strictly aerobic and demands oxygen.Harvesting: The bacteria will multiply rapidly. Peak growth usually occurs between 10 to 24 hours, which you can confirm when the liquid becomes highly cloudy (turbid). At this stage, the bacteria are rich in urease and fully ready to be mixed into sand or concrete mixes for biocementation experiments.Are you cultivating this bacterium for a school experiment, or are you looking to scale it up into large-scale bioreactors for engineering or concrete-healing applications? Let me know, and I can provide tailored advice on scale-up or optimization.8 sitesProduction of Biocement Bricks Using S.Mar 6, 2025 — the research investigates microbially induced calide precipitation using ESP pastri to produce biocement bricks it explores the ef...1mJoVEShelf-Stable Sporosarcina pasteurii Formulation for Scalable ...Jan 20, 2025 — S. pasteurii DSM33 was obtained from the Leibniz Institute DSMZ (Braunschweig, Germany) and used throughout this study. S. pasteur...National Institutes of Health (.gov)Sporosarcina pasteurii can be used to print a layer of calcium ... - PMC2.1. ... S. pasteurii (ATTC 11859) was used as ureolytic microorganism as this strain has a very high specific ureolytic activity,National Institutes of Health (.gov)
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