3rd Results of Diluting the Plain Yogurt
June 19
Our goal is to dilute three times and average them. So, after the two successful dilutions of the plain yogurts, I repeated the same procedures but with different dilution factors for the brands I could not count in the previous experiment.
Procedure:
**
- Dannon: dilute up to 104x
- Stonyfield: dilute up to 103x
- Siggi's: dilute up to 106x
- Chobani: dilute up to 106x
**
- Dannon: plate 103x and 104x
- Stonyfield: plate 102x and 103x
- Siggi's: plate 105x and 106x
- Chobani: plate 105x and 106x
Results:
Dannon:
Had nothing
CFU's = [23.7 x 102] / 0.1mL = 2.37 x 104
- 103x:
CFU's = [3.7 x 103] / 0.1mL = 3.7 x 104
CFU's = [253 x 105] / 0.1mL = 2.53 x 108
- 106x:
CFU's = [26.7 x 106] / 0.1mL = 2.67 x 108
Chobani:
- 105x:
CFU's = [193 x 105] / 0.1mL = 1.93 x 108
- 106x:
CFU's = [20 x 106] / 0.1mL = 2.0 x 108
Our goal is to dilute three times and average them. So, after the two successful dilutions of the plain yogurts, I repeated the same procedures but with different dilution factors for the brands I could not count in the previous experiment.
Procedure:
**
- Dannon: dilute up to 104x
- Stonyfield: dilute up to 103x
- Siggi's: dilute up to 106x
- Chobani: dilute up to 106x
**
- Dannon: plate 103x and 104x
- Stonyfield: plate 102x and 103x
- Siggi's: plate 105x and 106x
- Chobani: plate 105x and 106x
Results:
Dannon:
Had nothing
Stonyfield:
- 102x:
A
|
26
|
B
|
25
|
C
|
20
|
Average
|
23.7
|
A
|
6
|
B
|
2
|
C
|
3
|
Average
|
3.7
|
Siggi's:
- 105x:
A
|
246
|
B
|
267
|
C
|
247
|
Average
|
253
|
A
|
27
|
B
|
26
|
C
|
27
|
Average
|
26.7
|
Chobani:
- 105x:
A
|
197
|
B
|
197
|
C
|
186
|
Average
|
193
|
- 106x:
A
|
15
|
B
|
22
|
C
|
23
|
Average
|
20
|
 |
| The count of Siggi's plain yogurt |
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