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Staphylococcus Epidermidis Research Paper

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Nguyen Nguyen Professor Microbiology 1 May 18th, 2016 01MW – Staphylococcus Epidermidis The Staphylococcus Epidermidis is classified as bacteria. Scientists reckon it to Firmicutes phylum and adjust it in Bacillales order of Bacilli class. This bacteria belongs to Staphylococcaceae family. As the name order, it is settled into Staphylococcus genus and S. Epidermidis species. S. Epidermidis makes its home on human skin, mucosal layer and nasal mucosa. Diseases can be taken form in human body and warm-blooded animals such as septicemia and endocarditis. In fact, S. Epidermidis is not too harmful on healthy tissue. The infection often occurs on newborn baby, drug users, and older people and those who need to use assistant devices on every part …show more content…

From the Unknown tube professor Cooper gave me, I scratched a little on the slant surface with the sterilized inoculating loop. Then I place it on a clean prepared slide which already had a slight drop of water. The two substances are mixed together in the middle of the slide and let dry completely. One extra step of “heat fix” is necessary to adhere everything to the surface of the slide. To start gram staining, I slightly pour crystal-violet all over the slide and let it sit for 30 seconds before wash it off with water. Next, I dye the Unknown with Gram’s iodine to create a complex only have on gram positive. The slide is rinsed by water after 30 seconds. Decolorization is the next step of the whole process. I let the alcohol flow on 45-degree angle slide within 15 seconds and wash it with water to remove colors on the surface. Lastly, the unknown is once again dyed with safranin for 1 minute then wash it off with water for the last time and dry it using bibulous paper. After experiment on microscope under oil immersion, I learned that my Unknown is gram positive. Under the lens, the bacteria appears in purple color. Its morphology is cocci arranged in cluster. However, during decolorizing process, I put too much alcohol to the crystal violet-iodine complex making the color overly removed. That led to the result of my gram positive has slightly redish

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