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Team:Newcastle/23 July 2010
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| - | '''Table 1:''' Arginine test using pH indicator stick to measure pH changes of the media. Table represents the change in pH over the time span of 300 minutes i.e. 5 hours. Here, | + | '''Table 1:''' Arginine test using pH indicator stick to measure pH changes of the media. Table represents the change in pH over the time span of 300 minutes i.e. 5 hours. |
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#Control (1) - LB media | #Control (1) - LB media | ||
#Control (2) - LB media with 10 mM of arginine | #Control (2) - LB media with 10 mM of arginine | ||
Revision as of 22:09, 25 October 2010
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Contents |
Arginine experiment
Aim
The aim of this experiment is to determine whether B. subtilis 168 is able to take up external arginine.
Procedure
- Please refer to Arginine test
Results
Arginine is an amino acid that is acidic. Therefore if B. subtilis 168 is able to take up arginine, it will cause a pH change in the media. This would result in an increase in pH.
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Figure 1: Arginine test using pH indicator stick to measure pH changes of the media.
| Time (in minutes) | Control (1) | Control (2) | Control (3) | Test (1) | Test (2) |
|---|---|---|---|---|---|
| 0 | pH 7 | pH 7 | pH 7 | pH 7 | pH 7 |
| 30 | pH 7 | pH 7 | pH 7 | pH 7 | pH 7 |
| 60 | pH 7 | pH 7 | pH 7 | pH 7 | pH 7 |
| 90 | pH 7 | pH 7 | pH 7 | pH 7 | pH 7 |
| 120 | pH 7 | pH 7 | pH 7 | pH 8 | pH 8 |
| 150 | pH 7 | pH 7 | pH 7 | pH 8 | pH 8 |
| 180 | pH 7 | pH 7 | pH 7 | pH 9 | pH 9 |
| 210 | pH 7 | pH 7 | pH 7 | pH 9 | pH 9 |
| 240 | pH 7 | pH 7 | pH 7 | pH 9 | pH 9 |
| 270 | pH 7 | pH 7 | pH 8 | pH 9 | pH 9 |
| 300 | pH 7 | pH 7 | pH 8 | pH 9 | pH 9 |
Table 1: Arginine test using pH indicator stick to measure pH changes of the media. Table represents the change in pH over the time span of 300 minutes i.e. 5 hours.
Here,
- Control (1) - LB media
- Control (2) - LB media with 10 mM of arginine
- Control (3) - LB media plus B. subtilis 168
- Test (1) - LB media with 10 mM of arginine plus B. subtilis 168
- Test (2) - LB media with 10 mM of arginine plus B. subtilis 168
Conclusion
B. subtilis 168 breakdowns arginine to urea by producing arginase. The urea is then further broken down to ammonia and carbonate. This will lead to an increase in pH. Both the test 1 and test 2, which contain B. subtilis 168 and 10 mM of arginina show an increase in pH from 7 to 9. While the control 1 and control 2, which contain no B. subtilis 168 remains at pH 7. The control 3 which contain B. subtilis 168 but without addition of arginine show an increase in pH from 7 to 8. This could be due to unidentified products that are secreted by the bacteria.
Therefore this experiment have shown that B. subtilis 168 is able to utilise arginine, and thus increase the overall pH of the media. The overalll change in pH will cause calcium ions to precipitate with carbonate, forming calcium carbonate.
   
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