Fecal coliform

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  • Publicado : 15 de julio de 2010
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1. | |
  | Based on the information in the table below select the correct combination of answers for the items listed below:   | | CFU | |
Dilution Water Blank | | 0 | |
100 mlsample | | 37 | |
10 ml sample | | 6 | |
1 ml sample | | 0 | |
Positive Control | | 87 | |
Rinse Blank | | 0 | |
* Calculate the fecal coliforms * What culture would youuse for the positive control? * Is the Dilution Water Blank ok? |
A. | 37 cfu/100 mls |
B. | 39 cfu/ 100 mls |
C. | E. coli |
D. | Enterobacter aerogenes |
E. | yes |
F. | no |
||
  | Student Response | Value |
1. | A, C, E | 100% |
2. | B, C, E | |
3. | A, D, E | |
4. | A, D, F | |
5. | A, C, F | |
|
Score: | 1.25/1.25 |
  |
|
2. ||
  | Based on the information in the table below select the correct combination of answers for the items listed below:   | | CFU | |
Dilution Water Blank | | 0 | |
0.01 ml sample || 57 | |
0.001 ml sample | | 7 | |
0.0001 ml sample | | 1 | |
Positive Control | | TNTC | |
Negative Control | | 0 | |
Rinse Blank | | 0 | |
* Calculate the fecalcoliforms * What culture would you use for the negative control? * Is the rinse blank ok? |
A. | 585,586 cfu/100 mls |
B. | 570,000 cfu/100 mls |
C. | E. coli |
D. | Enterobacteraerogenes |
E. | yes |
F. | no |
|
|
  | Student Response | Value |
1. | A, C, E | |
2. | A, D, F | |
3. | B, C, E | |
4. | B, D, E | 100% |
5. | B, D, F | |
|Score: | 1.25/1.25 |
  |
|
3. | |
  | Based on the following dilutions, calculate the cfu/100 ml. All are for fecal coliform analysis.
The volume of each dilution bottle is 99 mls. All 100ml from each bottle was passed through the filter. Calculate the fecal coliforms |
|
  | Student Response | Value |
1.  | 89109 cfu/100 ml  | 0% |
|
Score: | 0/1.25 |
  |
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4. |...
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