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Core Practical Mint or Garlic Toothpaste? Testing anti-bacterial properties.

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Core Practical - Mint or Garlic Toothpaste? Hypothesis I think that the garlic will have higher antibacterial properties than the mint. This is because the garlic is more acidic, and therefore will be able to destroy the bacteria easier, and have a larger zone of inhibition. Variables The Independent variable in this investigation is the presence of the garlic or mint. The Dependant variable in this investigation is the zone of inhibition around the disc. This will be measured by measuring the zone around the disc, using a ruler, after the Petri dish had been left for an adequate amount of time. The control variable was the length of time that the mint or garlic had to kill the bacteria. This was controlled by everyone leaving the dishes for the same amount of time, 48 hours. Other variables includes concentration of plant material, lawn of bacteria on Petri dish, contamination of Petri dish by other microbes, and the volume of plant material on each disc. ...read more.


The results should be accurate as the equipment is all functioning correctly currently. Results Mint Garlic 1 2 3 4 5 6 7 8 Group 1 0 0 0 0 0 0 0 0 Group 2 16 27 21 22 12 20 15 11 Group 3 0 0 0 0 16 20 22 15 Group 4 0 6 0 0 16 17 14 15 Group 5 16 14 18 20 14 13 17 11 Group 6 4 0 6 5 9 8 10 6 Average 1.3 13.8 Zone of inhibition (mm) The table above shows the results for our investigation into the antibacterial properties of mint and garlic, and the results seem to follow a general trend. Conclusion The patterns in the results is that generally the results support the hypothesis which is that the more schlerenchyma fibres that are used, the larger the mass that can be held. However, there are a few possible anomalies, using the graph I can see that Group 1's result for 4 and 5 strands is particularly different to the other sets of results as it does not follow the general trend stated in the hypothesis. ...read more.


Different people extracting the celery fibres may also have an effect on the outcome as fibres of different sizes and thickness may be acceptable to some, but not others. Next time I would have the same person extracting all the fibres, to minimise differences in the results. Some people lowered the mass onto the celery fibres, wheras others almost dropped the mass on. Obviously this can have an impact on the strength of the mass, and how long the fibre lasts. If I was to conduct the experiment again, I would get everyone to do the same thing, lower the weight down. A random error that may have taken place could have been that a particularly strong or weak fibre was used. I think that the results were valid, as they tested the hypothesis. I also think that the results are relatively reliable, due to the 6 repetitions, however I think that the results were quite inaccurate due to the many systematic and random errors that took place due to the method and the apparatus. ...read more.

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