Gram Positive Bacteria And Gram Negative Bacteria

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Bacteria can be divided into two types of species, gram positive bacteria and gram negative bacteria. To determine whether a certain type of bacteria was classified tests were conducted by Hans Christian Gram; who discovered the differences within the cell walls of the bacteria. Gram positive bacteria have a thick wall which consists of the protein peptidoglycan. This is opposite to gram negative bacteria which has a thin cell wall, which fold over each other (Wells, 2017). They retain a much thinner peptidoglycan wall between two membranes. The membrane surrounding the cytoplasm and the outer membrane. (Wikipedia, 2017). Both gram positive and gram negative bacteria both stain, gram positive retains violet dye. Gram positive bacteria don't retain the dye and turn red or pink (Diffen, 2017). Due the difference in cell wall thickness gram negative bacteria is harder to inhibit, compared to gram positive bacteria.

Two types of bacteria will be tested throughout this investigation, Serratia Marcescens and Staphylococcus Epidermidis. Serratia Marcescens are gram negative bacteria, which can be found on any surface. They mainly occur in water, soil, or and within animals located in their digestive tract (Antonette B Climaco, 2017 ). They are stained red which can often be mistaken with blood drops. This bacteria can affect the macrophages within the human body, this affects the immune system and the destruction of foreign pathogenic cells within the body. Staphylococcus
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