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

Biology Lab Report - Effects of Mouthwash on Oral Bacteria

Extracts from this document...

Introduction

BIOLOGY LAB REPORT: Investigating the effects of mouthwash on oral bacteria. Introduction Mouthwash targets bacteria in the mouth and are either antiseptic or antibacterial in nature. Antiseptics are antimicrobial substances that are applied to living tissue or skin to reduce the possibility of infection. Antiseptics are generally distinguished from antibiotics by the latter's ability to be transported through the lymphatic system to destroy bacteria within the body, and from disinfectants, which destroy microorganisms found on non-living objects. Some antiseptics are true germicides, capable of destroying microbes (bacteriocidal), whilst others are bacteriostatic and only prevent or inhibit their growth. Antibacterials are antiseptics that have the proven ability to act against bacteria. An accumulation of oral bacteria can lead to a build-up of dental plaque (the material that adheres to the teeth and consists of bacterial cells, which if are not removed through flossing and brushing, can lead to gingivitis or periodontal disease). According to the American Dental Association, regular brushing and proper flossing are enough in most, and mouthwash should only be used as a short-term solution. ...read more.

Middle

2. Without removing the lid, carefully turn the plate upside down and using a marker, divide the plate . into 4 quadrants. 3. label the quadrants. 4. Using the sterile swab, swab the inside of your cheek. 5. Open the petri dish and gently (so as not to destroy the agar) wipe the swab across the entire plate. 6. When finished swabbing the plate, quickly replace the lid. 7. Obtain three samples of mouthwash in small beakers. 8. Place a filter paper disc in each solution to soak for about lA s. 9. Carefully remove the lid from your agar plate and using forceps, place a soaked filter paper disc in each quadrant. 10. Make a note of which mouthwash disc was placed in which quadrant. 11. Seal the edges of your agar plate with tape. (From now on, the tape and lid are not to be removed!!) 12. Place your agar plate in the incubator for 48 hours. Day 2 1. Obtain your group's agar plate from the incubator - DO NOT REMOVE TAPE 2. ...read more.

Conclusion

Water is not at all effective at killing mouth bacteria. There was no zone of inhibition surrounding the filter paper soaked in water. iv. Which mouth wash is the 'best buy'? Scope-Mint. v. Was your hypothesis correct or incorrect? Explain. My hypothesis was incorrect. The experiment showed that Mouthwash B (Listerine-Cool Mint) an average zone of inhibition of 0.36cm, the lowest average zone of inhibition on bacteria compared to the other mouthwashes. Instead, mouthwash B (Scope-Mint).It showed an average zone of inhibition of 1.4cm, the highest average zone of inhibition on bacteria compared to the other mouthwashes. vi. What are the weaknesses or limitations of the lab procedure?(at least 2) The duration of the procedure was too short for substantial results to be observed. There was uneven bacterial growth over the agar, leading to inaccurate zones of inhibition. vii. What are your suggestions for improvements to the lab procedure?(based on the weaknesses listed in vi) The duration of the procedure could be extended another day to allow for more bacterial growth for more accurate results in the experiment. Ensure that the entire petri dish is completely swabbed without gaps in between. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate Biology 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 International Baccalaureate Biology essays

  1. Marked by a teacher

    Biology: Lab report Germination

    4 star(s)

    2. Sprinkle thirty cress seeds in the Petri dish, on the cotton wool. Water until cotton wool is drenched. 3. Put the lid on. Repeat this for the remaining Petri dish. 4. Place both of the dishes in a regular environment.

  2. Mitosis Lab report

    These chromatids are then known as chromosomes when separate. In anaphase, the chromatids are not at the sides yet, but rather just separated and heading towards the sides. Telophase: The chromatids have reached each side of the cell, and then the whole cell starts to split.

  1. effect of microwave radiation on lentil seeds lab report

    The results above show us several things that need to be taken into consideration. The groups of lentil seeds exposed to different intensities of light produced by electromagnetic radiation from the microwave grew at different speeds and to different extents. Some grew a lot and some didn't grow at all.

  2. The Effects of Salinity on Wheat Germination

    0.5 0.5 1.0 0.5 1.5 0.5 0.5 7.0 2% number 3 0.0 0.0 0.0 0.0 0.0 1.0 0.5 0.5 0.5 1.0 0.5 1.0 0.5 0.0 5.5 2% number 4 0.0 0.0 0.0 0.0 0.5 0.5 0.5 0.5 1.0 0.5 0.5 2.0 0.5 0.0 6.5 2% number 5 0.0 0.0 0.0

  1. Vitamin C Lab

    Furthermore, another reason why the concentration is particularly low at 10�C is perhaps because we had left the freshly squeezed lemon juice totally exposed to air and light, and by the time we tested the concentration at 10�C, it was nearly an hour after the juice was squeezed out.

  2. Pill Bug Lab

    The results in the attached chart and graph demonstrate the experiment. Table 2. Data collected during a trial to find out if Pill bugs prefer saltwater, tap water, or sugar water saturated potting soil. 3 mL of each type of water were added to 30 mL of potting soil that

  1. Plant Tropism Lab

    Degrees to the right (�) March 11 March 12 March 15 March 16 March 17 March 18 M-1 - - - - - - M-2 - - - - - - M-3 - - - - - 5 M-4 30 70 - 30 22 60 M-5 - - - 42

  2. Plant Science Lab Report

    However, the other plants have all died due to the presence of salt in them. This is because salt in plants dehydrates the cells in plants causing the plants to die. The salt has also affected the process of photosynthesis by stopping it.

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