Preview

Gram Staining Essay

Good Essays
Open Document
Open Document
665 Words
Grammar
Grammar
Plagiarism
Plagiarism
Writing
Writing
Score
Score
Gram Staining Essay
Introduction:The objective throughout the gram staining experiment was to classify bacteria through their chemical nature as well as the physical structure of their cell walls. Through this experiment one would be able to observe either a thick or thin layer of peptidoglycan by the appearance of the bacteria staining either gram-positive blue-purple or gram-negative pink.
Question: Is there a subsequent effect of the bacteria when decolorizing with alcohol?
Hypothesis: If there is either a removal of the outer cell membrane or dehydration of the bacteria then there is to be an effect in cause of the decolorizing agent .
Materials: One bunsen burner, Two bacteria cultures, Two microscope slides, Inoculating loop, Clothespin, Gram’s crystal violet, Gram’s iodine, Decolorizing agent: Gram’s alcohol, Safranin, Distilled water, 1 large petri dish, 1 small petri dish, Microscope
Procedure: Once in groups and materials are obtained one is to heat fix a bacteria culture by sterilizing the inoculating loop with an ignited bunsen burner using the loop to obtain the distilled water to place on a microscope slide the inoculating loop is then again sterilized and used to place a single bacteria culture unto the same microscope slide. The microscope slide is then set a side attached to the clothespin to semi air dry where once done the slide is then passed through the ignited bunsen burner several times to heat-fix the observed smear produced. The bacteria is then
…show more content…
When conducting the gram staining test there was of evidence to support the initial hypothesis of the effect of the bacterial cell with the addition of Gram’s alcohol as the the lipopolysaccharide layer was removed in Culture A and in Culture B there was in observance of a shrinkage in pore

You May Also Find These Documents Helpful

  • Good Essays

    G Straine Lab Report

    • 1558 Words
    • 7 Pages

    To grow the bacterial culture, use 10 ml of liquid LB growth media for incubation. 500 ml of the bacterial culture is allowed to grow overnight at 37°C. It is later shaken vigorously to increase the OD600 to 0.5, which means that time equals zero. At time zero, 1 mL of the culture is transferred into a 1.5 mL centrifuge tube and centrifuged for 5-10 minutes to obtain a pellet. The supernatant should be discarded. The centrifuge with the bacterial pellet is labeled “G0” and stored at -20°C. The culture is induced with 1 Mm of IPTG and allowed to keep growing. After 3 hours past induction, 1 mL of the culture is pelleted into a different 1.5 mL centrifuge tube, and the bacterial pellet is labeled “G3.” The centrifuge with G0 bacterial strain needs 15 mL of the strain to be collected and to be pelleted into the centrifuge tube. The last pellet is labeled “G3-15 mL.” Finally, both the G3 and G3-15 mL are to be stored at -20°C.…

    • 1558 Words
    • 7 Pages
    Good Essays
  • Powerful Essays

    Double Unknown Lab Report

    • 1229 Words
    • 5 Pages

    The following tables are each corresponding to either the Gram-positive sample or Gram-negative sample and include the tests utilized along with their results all in the order each test was performed. In section 10, Figures, there are some pictures corresponding to the stains performed. In Figure 1, the Gram-positive stain, you can clearly see the purple color and cocci morphology in grapelike clusters. Figure 2 is the Gram-negative stain with the safranin color and shows bacilli cellular morphology.…

    • 1229 Words
    • 5 Pages
    Powerful Essays
  • Good Essays

    Gram Staining Lab

    • 423 Words
    • 2 Pages

    Prokaryotes are a large group of organisms with no membrane bound organelles. They consist of two domains: Archaea and Bacteria. These organisms are only found in extreme environments such as volcanoes. Prokaryotes are still being researched and are a very diverse group. In this lab we focused on trying to identify if the bacteria found had a lot of peptidoglycan by gram staining. Testing this could be done by using a Petri dish full of agar and testing different bacteria on it to see if the bacteria obtained is gram positive or gram negative. My hypothesis is there will be a lot of bacterial growth on all of the plate.…

    • 423 Words
    • 2 Pages
    Good Essays
  • Good Essays

    Gram staining is a technique that was invented by Hans Christian Gram in 1882 (Cantey & Doern, 2015). First, a drop of water was placed on a microscope slide. Using a loop and aseptic techniques (working by an open flame to prevent contamination, and sterilizing the loop in the flame until red hot), a small amount of bacteria from the master plate was mixed with the water then streaked onto the slide. The slide was allowed to dry, then the bacteria was heat fixed onto the slide by running it through the flame twice. A clothespin was attached to the slide and the slide was placed on a staining tray. The smear was covered with crystal violet and allowed to stain the bacteria for two minutes. Then, the slide was rinsed with distilled water at an angle, not directly onto the smear. Grams iodine was added to the slide and allowed to sit for one minute and rinsed again with distilled water. Next, the differentiation step occurred (Bartholomew & Mittwer, 1952) using a small amount of alcohol (about 8 drops) rinsed over the slide, followed immediately by rinsing with distilled water. Safranin was then added to the slide and allowed to sit for 30 seconds then rinsed with distilled water. After blotting the slide with bibulous paper, the slide was viewed under the microscope at 1000X magnification. The counterstain Safranin can be substituted for another…

    • 1550 Words
    • 7 Pages
    Good Essays
  • Good Essays

    MicroOrganism

    • 777 Words
    • 4 Pages

    The purpose of this experiment is to distinguish and indentify an unknown bacterium. There are several tests that can help one eliminate and narrow down the options. The most useful test, and the very first one done, is a gram stain. This test will tell whether the bacterium is gram-positive or gram-negative. After the type of gram stain is identified, the tester has a wide array of differentiating tests at their disposal. Based on the results from these tests, and the numerous others that are available, one can accurately establish the identity of an unknown bacterium.…

    • 777 Words
    • 4 Pages
    Good Essays
  • Satisfactory Essays

    Lab 4

    • 890 Words
    • 4 Pages

    Name and Course Section: Avital Gershtein, Section 701 Title: Aseptic Technique & culturing Microbes - Lab # 4…

    • 890 Words
    • 4 Pages
    Satisfactory Essays
  • Good Essays

    The first and easiest data to record is the color of the bacterial colonies on a nutrient agar plate. Growing the cultures on the agar can be done by streaking a plate so as to isolate the bacterial colonies. Then separate the two colonies that are different in growth on a TP plate by using the same streaking techniques with a sterile loop. Both bacteria will then undergo a simple stain and a gram stain. The simple stain uses the charged portion of a chromogen and allows it to act as a dye where it becomes positively charged as a result of picking up a hydrogen ion or losing a hydroxide ion. Thus, the cell becomes colored. The simple stain is useful for identifying the shape of the unknown bacteria. A gram stain is also performed on the unknowns. The gram stain first uses crystal violet as the primary stain. Iodine is then used as a mordant fixodent to lock the stain in. Ethanol is used to decolorize the cell. Safarin is then used as the counter stain in order to show a contrast between the two colors. If the bacteria cell is…

    • 1159 Words
    • 5 Pages
    Good Essays
  • Good Essays

    Unknown Lab Report

    • 1149 Words
    • 5 Pages

    Prepare two slides for gram staining and viewing under a microscope. {Either my gram-stain slides were bad or the microscopes I chose for viewing were not good. No bacteria were found under the microscope.}…

    • 1149 Words
    • 5 Pages
    Good Essays
  • Good Essays

    Purpose: The purpose of this lab is to familiarize the student with the use of a compound microscope and the Gram Stain test. Students will review a brief video and slides to introduce the compound microscope. Students will also view a video about the Gram Stain procedure and then answer questions related to it.…

    • 512 Words
    • 3 Pages
    Good Essays
  • Good Essays

    Unknown Lab Report

    • 638 Words
    • 3 Pages

    | To determine the ability of a bacterium to fremnet a carbohydrate, make acid or gas…

    • 638 Words
    • 3 Pages
    Good Essays
  • Satisfactory Essays

    lab 1

    • 433 Words
    • 2 Pages

    Purpose: Is to gain knowledge on how to use a microscope and oil immersion lens while observing prepared bacterial slides and also to prepare slides for observable bacteria culture from yogart.…

    • 433 Words
    • 2 Pages
    Satisfactory Essays
  • Good Essays

    Upon performing a gram stain on a colony from a streak of the unknown bacteria, at 100x, the bacteria stains negative for the gram stain. In addition, the structure of the bacteria is bacilli.…

    • 698 Words
    • 3 Pages
    Good Essays
  • Good Essays

    Unknown Bacteria Essay

    • 614 Words
    • 3 Pages

    Secondly both bacteria had to be gram stained, so that they could be identified as gram-positive or as gram-negative. The same gram staining method was used for both bacteria, which consisted of inoculating each bacteria into a…

    • 614 Words
    • 3 Pages
    Good Essays
  • Good Essays

    Unknown Bacteria Essay

    • 708 Words
    • 3 Pages

    Many different species of bacteria look similar under the microscope and also have the same staining results (ex. Gram stain). To be able to differentiate between the different species, one can look at the metabolic differences (fermentation), as well as the environmental condition differences (temperature, pH, oxygen requirements). Being able to manipulate these conditions in a controlled environment can help to correctly identify the exact bacteria. Different media can be used to culture and identify bacteria.…

    • 708 Words
    • 3 Pages
    Good Essays
  • Powerful Essays

    It is also customary to write in the past tense for most of the report. This includes the introduction,…

    • 1647 Words
    • 7 Pages
    Powerful Essays