Gram-positive bacteria

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  • Gram Positive Bacteria Report

    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.…

    Words: 1140 - Pages: 5
  • KOH String Test Lab Report

    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…

    Words: 1945 - Pages: 8
  • Lab Report: Bionic Antibiotics Vs. Bacteria

    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…

    Words: 2028 - Pages: 9
  • Gram Unknown Lab Report

    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…

    Words: 1105 - Pages: 4
  • Bacteria Structural Morphology

    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…

    Words: 1262 - Pages: 6
  • Gram-Bad Bacteria

    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…

    Words: 1590 - Pages: 6
  • Catalase Test Essay

    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…

    Words: 1742 - Pages: 7
  • Essay On Healthcare Acquired Infections

    Healthcare acquired infections, or HAIs, are preventable infections that a patient obtains while receiving treatment for another infection or surgical condition. These types of infections can occur in a variety of clinical care settings such as acute care hospitals, ambulatory surgical centers, dialysis facilities, outpatient care, and long-term care facilities. HAIs can be caused by the use of medical devices such as catheters, central lines, or ventilators, and by surgical procedures. In fact,…

    Words: 913 - Pages: 4
  • Microbiology Unit 4 Microorganisms

    A total of four microorganisms were isolated from the sample brought back from Mars. To identify the microorganisms which were isolated from the sample brought back from Mars, an rDNA sequence analysis was required. Every sequence had an S_ab score of 1.000 meaning the sequence is identical to the microorganism that it was matched to. Before gathering phenotypic results, we gathered phylogenetic data for the four microorganisms which includes Micrococcus luteus, Citrobacter freundii, Hafnia…

    Words: 963 - Pages: 4
  • Squeezed Orange Juice Case Study

    Fruit juices has a pH range <4.5 which serve as a good hurdle for the growth of microorganism (Aneja et al 2014). The addition of the extracts did not affect the pH of the orange juice, but it could be possible that the extracts maintained the pH of the juice and hence, limiting the growth of some microorganism. The minimum pH for the growth of yeast and mould is 1.5, whereas for the aciduric bacteria is between pH 2.9-4.5 (Aneja et al 2014). This show that the low pH environment of the juice…

    Words: 2106 - Pages: 9
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