Team:Bielefeld-CeBiTec/Notebook/Journal/rMFC/Jun

From 2014.igem.org

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<li><b> Reduction and Oxidation of neutral red </b>
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<li><b> Reduction and oxidation of neutral red </b>
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<li> This week we checked the properties of neutral red under oxidizing and reducing conditions by adding chemical agents </li>
<li> This week we checked the properties of neutral red under oxidizing and reducing conditions by adding chemical agents </li>
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<li> Conclusion: the color of the solution depends on the pH </li>
<li> Conclusion: the color of the solution depends on the pH </li>
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<li><b> Further cultivation experiments with neutral red </b></li>
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<ul> 
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<li> This week we cultivated <i>E. coli</i> in LB-medium with 100 µM neutral red which is reduced by different concentrations of sodium dithionite before </li>
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<ul>
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<li> Attempts and controls </li>
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<ul>
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<li> Negative controls:
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<ul>
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<li> 0 µl of sodium dithionite </li>
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<li> 100 µL of sodium dithionite </li>
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<li> 200 µl of sodium dithionite </li>
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<li> 500 µl of sodium dithionite </li>
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<li> Positive control:
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<ul>
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<li> 0 µl sodium dithionite with <i>E. coli</i> </li>
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</ul>
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<li> Attempts: </li>
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<ul>
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<li>100 µl sodium dithionite with <i>E. coli</i></li>
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<li> 200 µl sodium dithionite with <i>E. coli</i> </li>
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<li> 500 µl sodium dithionite with <i>E. coli</i> </li>
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</ul>
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</ul>
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<li> Results </li>
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<ul>
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<li> Negative controls: all controls got colored probably through oxidation by air </li>
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<li> Positive control: turned yellow and turbid probably because of alkaline conditions and high cell density </li>
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<li> Attempts: all attempts turned red but no turbidity is visible probably because sodium dithionite could be toxic to the cells </li>
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</ul>
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Revision as of 18:11, 26 September 2014


June

Week 3     06/16 - 06/22
Week 3     06/16 - 06/22
  • Initial cultivation experiments with neutral red
    • This week we wanted to test the properties of neutral red during a cultivation on a small scale
      • Cultivation of the E. coli strain with porines (attempt 1) and wildtyp as control (attempt 2)in LB-medium with 100 µM neutral red
      • pH was set up at 8.75
      • Results
        • Attempt 1 turned red (pH = 7.495)
        • Attempt 2 remained yellow
Week 4     06/23 - 06/29
Week 4     06/23 - 06/29
  • Reduction and oxidation of neutral red
    • This week we checked the properties of neutral red under oxidizing and reducing conditions by adding chemical agents
      • Reducing agent: sodium dithionite
        • Red solution got reduced and turned colorless
        • Got oxidised by air again afterwards
      • Oxidizing agent: hydrogen peroxide
        • Red solution stayed red
        • Yellow solution stayed yellow
      • Conclusion: the color of the solution depends on the pH
Week 5     06/30 - 07/06
Week 5 06/30 - 07/06
  • Further cultivation experiments with neutral red
    • This week we cultivated E. coli in LB-medium with 100 µM neutral red which is reduced by different concentrations of sodium dithionite before
      • Attempts and controls
        • Negative controls:
          • 0 µl of sodium dithionite
          • 100 µL of sodium dithionite
          • 200 µl of sodium dithionite
          • 500 µl of sodium dithionite
        • Positive control:
          • 0 µl sodium dithionite with E. coli
        • Attempts:
          • 100 µl sodium dithionite with E. coli
          • 200 µl sodium dithionite with E. coli
          • 500 µl sodium dithionite with E. coli
      • Results
        • Negative controls: all controls got colored probably through oxidation by air
        • Positive control: turned yellow and turbid probably because of alkaline conditions and high cell density
        • Attempts: all attempts turned red but no turbidity is visible probably because sodium dithionite could be toxic to the cells

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