Gram-positive bacteria

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    that are gram positive are staphylococci which produce enzymes such as catalase which break down hydrogen peroxide bonds, bacillus cereus - food poisoning, bacillus anthracis - anthrax and clostridium tetani - tetanus. Penicillin is an antibiotic that prevents gram positive bacteria from forming peptidoglycan. Peptidoglycan plays a key role in the cell wall. If peptidoglycan was not present, then the bacterium would swell and burst due to the high internal pressure. Cephalosporin is another antibiotic that works against gram positive bacteria as they prevent the bacteria walls from synthesis. Sulfamethoxazole and Sulfisoxazole are antibiotics that are also effective in working against gram positive bacteria.…

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    KOH String Test Lab Report

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    Introduction: Bacteria are very diverse and are part of the prokaryotic domain. Some bacteria can be harmful, but others can also be beneficial in many ways. There are bacteria everywhere on Earth; places that you would think would have bacteria, like your gastrointestinal tract or our skin (Wenner, 2007). Although bacteria are small in size and are a simple cell organism, it is essential to life. There are different ways in how to distinguish and classify bacteria. One way is you can look…

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    Unknown Bacteria

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    When it derives to contemplating out an unknown bacterial species the whole purpose is to benefit us in order to better understand what this species is capable of. Throughout a general basis of identifying an unknown species we must figure out either it will become a gram-positive or gram-negative type of bacteria and in doing so we must do a gram staining method. This method works because it will direct us to what test we can do next based off either it is negative or positive bacteria, which…

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    Gram Unknown Lab Report

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    of two unknown bacteria, I performed a series of experiments over several days. To begin this process I created a dichotomous key that I utilized as a guide to perform a series of inoculations, while using both selective, and differential media. The series of inoculations eliminated bacterium based on test results until the correct bacteria were both positively identified. On day one of this process I received two bacteria, one labeled 7A and the other labeled 7B. I began the experiment with…

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    Identification of bacteria can be a difficult process due to the fact that individual bacterial cells can possess similar structural morphology to other types of bacteria. As we have demonstrated in previous lab experiments there are key biological and chemical processes that are characteristic to different types of bacteria. Using various biochemical tests we can evaluate and detect these different processes to aid in our identification of unknown bacterial samples. The implications of these…

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    Period 3 Biology H February 27th 2015 Bionic Antibiotics VS. Bacteria Abstract: The bacteria lab preformed in class tested the effectiveness of antibiotics against bacteria. During the lab we tested the antibiotics penicillin, streptomycin and tetracycline against the bacteria Escherichia coli and Staphylococcus epidermis in order to determine which antibiotics fought which bacteria most successfully. In order to monitor the experiment, we kept a control sample in which no bacteria was…

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    Gram-Bad Bacteria

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    determine the identity of three unknown bacteria contained in broth medium stored in labeled test tubes that were randomly assigned containing: one Gram positive bacterium, one Gram-negative paracolon, and one Gram-negative coliform (Carson, 2016). The unknown sample assigned in this experiment was #19. After initially streaking the solution on clean streak plates and TSA agar, the identity was determined from a Gram-stain of a single, isolated colony; this was confirmed by isolation of that…

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    Gramicidin Research Paper

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    There were several types of antibiotics that have a structure similar to that of a crown ether and one antibiotic that has a structure similar to crown ether would be gramicidin. Gramicidin works against gram-positive bacteria but it doesn’t work against gram-positive bacilli. It also works against select gram-negative organisms. In the year 1939, René Dubos discovered the gramicidin antibiotic.1 Gramicidin contains a mixture of three antibiotic compounds, gramicidins A, B and C and with its…

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    S. Coli Lab Report

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    Azziz reported that the hexane extract of S.aromaticum has good antibacterial properties on both E.coli, and S. aureus based on the zone of inhibition which has a diameter range of 7mm to 10mm. In this study, the extract of hexane of S.aromaticum showed positive antibacterial properties against E. coli, and S. aureus for concentrations of 25, 50, 75, 100. The methanol extract showed positive against S. aureus for 75 and 100 mg/ml. The DCM extract showed positive for E. coli, S. aureus, (100…

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    Catalase Test Essay

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    After performing the gram staining and observing which unknown culture was gram positive, a catalase test was performed. The catalase test allows lab workers to differentiate Staphylococci and Streptococci genus. The test was performed only on the gram-positive culture. Bacteria that respire by the use of oxygen, otherwise known as aerobic respiration, produce enzyme or “catalase”. This protects the bacteria from the harmful by-product produced from oxygen metabolism that would normally be…

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