• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

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

Extracts from this document...

Introduction

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.

Middle

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.

Conclusion

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.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Molecules & Cells section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Molecules & Cells essays

  1. Marked by a teacher

    Beetroot Practical Write up

    3 star(s)

    any, structure to the cell membrane to hold in the pigment if the lipids have been damaged or destroyed. Biological molecules and cell membrane: The cell membrane can be seen as a fluid structure in which proteins can move about depending upon the fluidity of the lipids and the amount of cholesterol.

  2. Peer reviewed

    Why do they put mint in toothpaste? Would garlic be better?

    3 star(s)

    All the equipment we used had been autoclaved We did not open the Petri dishes that contained the growing bacteria The Petri dishes containing the bacteria were autoclaved after we finished the experiment. Results Inhibition Zone (mm) Mint Garlic Control test 1 16 22 13 test 2 16 20 13

  1. Free essay

    Investigation into the antibacterial properties of mint and garlic.

    * Escherichia coli (E. coli) * Pestle and mortar * Sterile syringe * Sterile forceps * Filter paper discs (5-10mm diameter) * Tape * Marker pen * Incubator set at 52�C * Methylated spirits Safety: Methylated spirits is toxic and highly flammable.

  2. Beetroot Core Practical (AS)

    iii. There is a certain degree of inaccuracy with measuring 5cm� and 2cm� by eye. iv. Temperature in water baths should be kept constant. v. The time each test tube spends in each water bath should be kept equal.

  1. Catalyse Investigation

    Firstly I must decide what I'm going to investigate. I am going to investigate the effect of pH and temperature on the activity of the enzyme amylase. Therefore I have developed two similar experiments (one for each factor I'm investigating).

  2. Why do they put mint in toothpaste? Would garlic be better?

    * When seeding the agar jelly with the bacteria we raised the lid of the Petri dish only enough to give access to the agar jelly. * When sealing the Petri dishes we did not fully seal them, therefore preventing anaerobic conditions and the bacteria that survives in these conditions which can be harmful to humans.

  1. Enzyme Assay.

    This means that a graph of the rate of reaction (i.e. amount of product formed /min) against the concentration of substrate is hyperbolic. At high concentrations of substrate, the curve tends towards the maximum rate of reaction, Vmax. In order to characterise an enzyme, and understand how its activity will

  2. Cost effectiveness of mainstream bench cleaners against generic supermarket cleaners on the number of ...

    Counting methods often involve the use of microbial growth rather than direct counting. The large numbers of individuals involved also creates difficulties, for example if a sample from a bacterial colony is inoculated into nutrient broth and incubated overnight in optimum conditions, approximately 108 organisms will grow per cm3.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work