The Shawnee Jefferson County Public Schools, Louisville, Kentucky The Effect of Micro-Gravity on the Viability of Lactobacillus GG.

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Presentation transcript:

The Shawnee Jefferson County Public Schools, Louisville, Kentucky The Effect of Micro-Gravity on the Viability of Lactobacillus GG

Working Toward Our Project Crystals, E. coli, fish egg’s, penicillin limitations- size, materials, food/nutrients and conditions/monitoring. WHY? Cosmonaut and bacterial research. Used everyday, cultural bacteria, and acid resistant Currently not implemented in NASA diet

Experimental Methods Serial Dilutions helped us get down to 9 million bacteria per milliliter. Needed 9 million for optimal growth and counting without overcrowding Plating the bacteria allowed us to view bacterial growth

Experimental Methods cont. The Incubator allowed us to control the environment of the bacteria The Spec 20 was another form of counting bacteria, but only the presence of the bacteria was accounted for

Results -curve for space growth is inconsistent -curve for Earth growth is smoother, but counter to our expectation -measurements appear to converge at -20 and -25

Results -curve for space increased its count over two days, especially at -15, slower growing -curve for Earth doesn’t show the same shape as before -the convergence at higher dilution factors remains, beginning at -15 here

Limitations Delayed delivery of Lactbacillus GG to school Length of experiment time vs. actual time needed Trouble with bacteria growth on R2A Broth Inconsistent CFU count Some plates were contaminated No sterile environment

Conclusions There is a slightly elevated growth difference in the space samples; however, the difference between the two is extremely small. Taking our limitations under consideration, our experiment indicates that micro-gravity has little to no effect on the growth of bacteria. How would our results differ if.. The experiment time was extended? We had put the bacteria under stress? We had up-to-date technology?