12+-+Micro+Lab+-+Antimicrobial+Drugs_Fillable

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School

Troy University, Phenix City *

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Course

MICROBIOLO

Subject

Biology

Date

Apr 3, 2024

Type

pdf

Pages

7

Uploaded by jayleygreene on coursehero.com

Antimicrobial Drugs and Sensitivity LAB#12 Learning Objectives: Student should explain the term minimal inhibitory concentration (MIC) Students will perform and antibiotic sensitivity test for a gram positive and a gram negative bacterium. Students will provide the rationale for the agar diffusion technique. Materials Required: Growing Broth Culture (2) Nutrient Agar Plates (2) Sterile Swab Bunsen Burner Ethanol Forceps Antibiotic Discs Test Tube Holder Ruler or Measurement tool for MM (second day) Instructions for this assignment: Students will be provided with 4 different antibiotics and two petri plates. Students will test the effectiveness of 4 different antibiotics using a gram positive and a gram negative bacteria. Record the names of the antibiotics in the table in the lab report by name and disc code.
Antibiotic Sensitivity Protocol A. Please be certain to label plates prior to spreading bacteria. B. Mix the tube of bacteria well while the top is secure. C. Immediately after mixing remove a sterile swab from package and place the swab into mixed bacterial sample. D. Roll the swab gently on the agar plate, making every effort to contact every area of the agar plate. Turn the plate and swab the plate again coming in contact with every are of the plate again. Repeat this until you have turned the plate in a complete circle. Repeat this at least 2 times. E. Place the plate near the flame from the Bunsen burner and leave the lid slightly open so that the plate will dry. F. On the writing surface of the plate (bottom) divide the plate into 4 quadrants labeling them 1 through 4. G. Repeat steps A through F for the second agar plate. H. Before applying the antibiotic discs to each plate label the table in this lab with the 4 selected antibiotics. Make sure that the antibiotics are the same for each plate. I. Alcohol flame the forceps making sure that your hand is above the forceps and the alcohol is dripping away from your hand. J. Remove the antibiotic disc for quadrant 1 and place the disc in the center of quadrant. Then tap the disc slightly to ensure good contact with the media. K. Repeat this step for quadrant 2 – 4. Please be certain you are placing the proper antibiotic in the proper quadrant. L. Repeat steps F through K for the second agar plate. M. Once you are finished with both agar plates place the plates in the incubator media side up.
Lab Report: Antimicrobial Drugs and Sensitivity Purpose: ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ Day 2 A. Remove inoculated plates from the incubator. B. Measure in millimeters (mm) and record the diameter of the zone of inhibition (area of clearing around the disc) in the table below and evaluate each using the key to determine if your results are Susceptible (S), Intermediate (I) or Resistant (R). DATA TABLE ANTIBIOTIC NAME DISC CODE Staphylococcus epidermitis Escherichia coli Zone Size S, I or R Zone Size S, I or R 1. 2. 3. 4. Conclusion: State a conclusion of your results for each bacteria and for each antibiotic treatment. __________________________________________________________ __________________________________________________________ __________________________________________________________ __________________________________________________________ __________________________________________________________ __________________________________________________________ Streptomycin S10 Tetracycline Te30 Penicillin Chloramphenicol 13mm 23mm P10 13mm C30 24mm 34mm 19mm 25mm 14mm I I S S R R S S To determine which antibiotics are susceptible, intermediate, or resistant to certain bacterias. Streptomycin is Intermediate to Staph Epi and E.Coli. Tetracycline is susceptible to both S.Epi and E.Coli. Penicillin is resistant to both S.Epi and E.Coli. Chloramphenicol is susceptible to both S.epi and E.Coli.
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