Difference between revisions of "2017 experiments"
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Cheryl Ching (talk | contribs) (added to 1/30/2017) |
Cheryl Ching (talk | contribs) m (fixed header for 1/31/2017) |
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We checked on the three milk cultures from last week. All of them had solidified to yogurt. S. salivarius had grown mold in it, so we started a new culture. We streaked plates for isolates, but found the agar was too soft and it was difficult to avoid puncturing the surface with the inoculation loops while streaking. Also, we streaked them directly from the dairy cultures, as we did not have liquid media to wash the cells with. | We checked on the three milk cultures from last week. All of them had solidified to yogurt. S. salivarius had grown mold in it, so we started a new culture. We streaked plates for isolates, but found the agar was too soft and it was difficult to avoid puncturing the surface with the inoculation loops while streaking. Also, we streaked them directly from the dairy cultures, as we did not have liquid media to wash the cells with. | ||
==1/31/2017== | |||
Revision as of 02:00, 1 February 2017
1/23/2017
We autoclaved three different agar media and poured plates:
Nutrient Agar:
- 2 g Carolina Nutrient Broth Mix
- 2.5 g Agar
- 250 ml distilled water
CCL1:
- 6.3 g soy powder
- 0.63 g K2 HPO4
- 1.56 g NaOAc
- 0.055 g magnesium chloride
- 0.016 manganese chloride
- 2.5 g agar
- 6.25 glucose
- 270 ml distilled water
MSY
- 2% soy powder
- 0.5% yeast extract
- 1.5% agar
CCL1 overflowed in the autoclave, so we were only able to pour the MSY and Nutrient Broth plates.
We also inoculated bacterial cultures on 2% skim milk (Berkeley Farms DairyPure), from freezedried commercial cultures:
- Streptococcus thermophilus
- Streptococcus salivarius ssp. thermophilus
- Lactobacillus paracasei
1/30/2017
We checked on the three milk cultures from last week. All of them had solidified to yogurt. S. salivarius had grown mold in it, so we started a new culture. We streaked plates for isolates, but found the agar was too soft and it was difficult to avoid puncturing the surface with the inoculation loops while streaking. Also, we streaked them directly from the dairy cultures, as we did not have liquid media to wash the cells with.