Gram Positive/Negative Bacteria And Antibiotics Ex Essay

1149 WordsMay 6, 20125 Pages
Abstract: For my experiment, I wanted to find out how gram positive and gram negative bacteria were affected by different antibiotics. After researching, I found out that some antibiotics are used to target specifically gram negative or gram positive bacteria. I performed an experiment anyway, but it produced inadequate results and no accurate conclusions could be reached from it. Introduction: There are many different types of bacteria, some are helpful and some are harmful. We have ways of differentiating them by shape (bacillus, spirillum, and coccus) and by testing the amount peptidoglycan in their cell membranes. The process of testing for it is known as gram staining, and it can separate bacteria into two distinct groups. Those with more peptidoglycan stain purple and are called ‘’gram positive’’, while those with less stain red and are called ‘’gram negative’’. Knowing whether certain bacteria are gram positive or gram negative is important for doctors treating bacterial infections. For example, if a patient seeks treatment for a bacterial infection, samples of the bacteria will be taken, cultured, and a gram stain would be performed to narrow down the possibilities of what bacteria it could be. Gram staining, along with determining the shape and environment of the bacteria can be used to find an effective treatment for that particular bacterial infection. Bacterial infections are treated with antibiotics, which work by either inhibiting the bacteria’s ability to synthesize a cell wall, inhibiting protein synthesis, or by interfering with their ability to reproduce. The four antibiotics used in my experiment are penicillin, ampicillin, neomycin, and erythromycin. Antibiotics such as penicillin and ampicillin work by inhibiting cell wall synthesis, making them more effective against gram positive bacteria ( which have more peptidoglycan and simpler

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