OSMOTIC PRESSURE 1. 24-hour cultures of. Escherichia coli Staphylococcus epidermidis Saccharomyces cerevisiae Spore suspension of Penicillium 3. TSA plates: 1 each of 2. TSA (0% NaCl + 0% sucrose) TSA + 5% NaCl TSA + 10% NaCl TSA + 15% NaCl TSA + 10% sucrose TSA + 25% sucrose TSA + 50% sucrose
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- Normal Streptococcus pyogenes No Spacing Heading 1 Heading 2 Streptococcus pneumoniae Title you observed the growth of Streptococcus pyogenes, Streptococcus pneumoniae and Staphylococcus epidermidis on the Horse Blood Agar (HBA) plates. The colonies and their surroundings looked like those in the image below. Based on the content of (HBA) plates and the specific properties of these three organisms, explain the particular appearance of the colonies on the plates. Name and describe the three subtypes of a process that occur on these plates. Styles Dictate Sensitivi Pane Staphylococcus epidermidis Focus E ETime point (min) Absorbance of culture at 660nm Approximate cell concentration Approximate # cells in 1mL extract 0 0.298 1.49 x 108 cells/mL 1.49 x 108 cells 10 0.316 1.58 x 108 cells/mL 1.58 x 108 cells 20 0.374 1.87 x 108 cells/mL 1.87 x 108 cells 30 0.429 2.145 x 108 cells/mL 2.145 x 108 cells 40 0.512 2.56 x 108 cells/mL 2.56 x 108 cells 50 0.544 2.72 x 108 cells/mL 2.72 x 108 cells 60 0.607 3.035 x 108 cells/mL 3.035 x 108 cells a. Using these data, prepare a growth curve of this strain ofEscherichia coli (E. coli).b. Estimate the doubling time for this strain of E. Coli. Clearly showhow you estimated this value from the empirical data presented.Sulfur Indole Motility (SIM) Medium H2S produced, color and +/-: ______________________________ Indole present/Tryptophan hydrolysis, color and +/-: ___________________________ Motile or non-motile: _____________________________
- . A certain medium has the following composition: Glucose 15 g Yeast extract 5 g Peptone 5 g KH2PO4 2 g Distilled water 1,000 ml Tell what chemical category this medium belongs to, and explain why this is true. How could you convert Staphylococcus medium (table 3.6A) into a nonsynthetic medium? a. Name four categories that blood agar fits. Alpha hemolysis Beta hemolysis Gamma Alpha prime Name four differential reactions that TSIA shows. Observe figure 3.15. Suggest what causes the difference in growth pattern between nonmotile and motile bacteria. Explain what a medium that is both selective and differential does, using figure 3.18. a. What kind of medium might you make to selectively grow a bacterium that lives in the ocean? MSA Mannitol salt agar One that lives in the human stomach? Why are intestinal bacteria able to grow…3- Visible Growth in Tubes Growth in Petri Dishes 0 µg/ml 2 µg/ml 0 1 3 4 ÖÖÖÖÖÖÖÖ 2 5 6 7 number 1, and After addition of The figure given above summarizes an experiment carried out to test the efficacy of an antimicrobial substance. In the tube number 0, no antimicrobial substance was added into bacterial culture. 2 µg/ml of antimicrobial substance was added into tube the amount of antimicrobial was doubled for each consecutive tube. antimicrobial into tubes, tubes were incubated for overnight and after incubation tubes were observed for growth. The growth status of bacteria in each tube was shown as (+) and (-). In addition to observation of visible growth, 1 ml of sample from each tube was collected and plated into petri dishes and incubated for additional overnight. Similarly, the growth status in petri dishes was as (+) and (-). According to given information; a. Determine the minimum inhibitory concentration (MIC). b. Determine the minimum bactericidal concentration (MBC). c.…Table C. Xanthoproteic Reaction Samples |1. Tryptophan 2. Tyrosine 3. Casein 4. Albumin 5. Peptone 6. distilled water Observation
- I. Match the bacterium being described in column X with its best classification found in column Y. Choose the best answer. Column X1. Staphylococcus aureus can be grown on mannitol salt agar that contains 7.5% NaCl. The bacterium is________. 2. Lactobacillus acidophilus grows best at pH 4.5. It is considered a(n) ________. Column Y A. acidophile B. alkalophile C. barophile 3. A bacterium that thrives in the Great Salt Lake but not in fresh water is probably a ________.4. Bacteria isolated from the bottom of the ocean need high atmospheric pressures to survive. They are________.5. A bacterium that thrives in a soda lake where the average pH is 10.5 can be classified as a(n) ________. D. halotolerant E. halophileSome Metabolic Activities of Bacteria A. Questions: 1. List 5 importance of using selected and differential culture media. 2. Mannitol Salt Agar is a differential or selective media? Explain why? 3. What enzyme and explain the principle on how Simmons citrate agar change in color for positive result? 4. What two groups of bacteria that can be differentiated with the catalase test?Imagine you have been given a liquid culture of yeast with a starting concentration of 3.67 x 10' cells/ml and are asked to carry out the sample dilution process shown in the figure below. 100μl 100μl 100μl 100μl 100μl 0.9ml 0.9ml 0.9ml H2O H₂O 6.9ml 0.9ml H₂O H₂O H₂O Original 10-1 102 10-3 104 Culture 105 100μl 100μl 100μl Plate A Plate B Plate C a. How many colonies should have been present on Plate A in this example? - Answers must be whole numbers as partial colonies are not expected. b. Imagine you carried out the same dilution scheme shown in the figure above, but now, you do not know the concentration of the original culture. If you counted 163 colonies on Plate B, what is the concentration of cells/ml in the original culture?
- I U Cardo 12 1三 ニ 三 rI TI3 4. 111 I. 5. What are the basic shapes of bacterial cells? What are the basic Know the terms. Which types of organisms have axial filaments? How would classify the following in terms of gram stain reaction and shape and arrangement of the cells Escherichia coli? Staphylococcus aureus? Streptococcus pyogenes? Bacillus anthracis? Do these organisms cause any important diseases? arrangements? you IIIク94% P 9:12 docs.google.com a * ZAIN IQ Iı. component used as a solidifying. . -1 * agent for media إجابتك media are used when specimen . . -2 .cannot be cultured soon after collection إجابتك media which can be used for. . -3 * motility testing إجابتك staining used for Mycobacterium. .-5 tuberculiosisIN YOUR OWN WORDS. Differentiate the following. (Not more than 10 sentences) 1. Aseptic Teachnique vs. Sterile Technique 2. Microbistatic Agent vs. Microbicidal Agent 3. Sterilization vs. Disinfection 4.How is radiation, autoclave and ultrasonic waves used in the hospitals or clinics as a means to inhibit the growthbof microbes? 5. How is filtration applied nowadays in relation to Covid-19?