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Only 1% of bacteria are harmful for humans however there are methods of preventing the spread of the harmful bacteria. Chemical substances that are used to either kill or inhibit growth of bacteria are known as antimicrobial agents, of which the three basic types are disinfectants, antiseptics and antibiotics. Disinfectants are chemicals used to inhibit growth or kill bacteria on living tissues, antiseptics inhibit growth or kill bacteria on nonliving things and antibiotics are compounds that block the growth and reproduction of bacteria.
Although microorganisms can develop a resistance to these agents, the effectiveness depends on factors such as environmental conditions etc.
Since the effectiveness varies, if environmental factors and other conditions were kept the same, the antibiotic would be most effective.
Number the quadrants 1-4 on the edges only. Turn the dish back up. DO NOT SPILL.
Immediately dispose loop.
We used a control disk in order to base the results on something in order to compare the effectiveness of the antimicrobials. Without the control, we would have no basis for comparison. The antibiotics did not do as good of a job as expected because they need to be continuously taken for a set period of time. Due to this reason, doctors subscribe antibiotics for 10 days and if use is stopped before that period, they can easily divide and multiply. The school bathroom soap showed the best results because it had the most amount of clear area. The use of a control showed that the inhabitance of bacteria observed was due to the antibiotic on the disk rather than the disk itself. If a serious staphylococcus infection developed in the locker room of the school gym and I were in charge, I would take a sample of the bacteria and repeat this experiment in order to find the most effective disinfectant.
I think that antibiotics seem to lose their effectiveness against a particular population of bacteria after a prolonged period of time because they adapt to the change and mutate overtime. It is important to take an antibiotic for the exact period of time it is prescribed because the bacteria could be dormant and if not completely killed, they can easily reproduce and make the person ill again. If I were infected with E-coli I would want to be prescribed a stronger antibiotic than erythromycin because it did not give the best result in the experiment.
All antimicrobials used inhibited the growth of the bacteria to some extent however the school bathroom soap showed the best results and inhibited growth to the furthest extent, which rejected my hypothesis. Although it did inhibit growth better than others, it wasn’t as effective as the school bathroom soap. I thought the antibiotic would work best, as it’s the most common used antimicrobial in hospitals however because it was only used once, it was quite ineffective. The hand sanitizer was least effective as it barely inhibited growth. In the end the hand sanitizer and antibiotic disks were both semi cloudy whereas the bathroom soap was clear. In conclusion the bathroom soap worked much better than I expected and I would surely use it before and after lunch in order to avoid being infected.
Antimicrobial Effectiveness in Bacterial Growth. (2016, Mar 31). Retrieved from https://studymoose.com/document/antibiotic-lab-report
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