dye‚ all of which inhibit the growth of gram-positive bacteria. As the name suggests‚ SS agar should theoretically only allow the growth of Salmonella and Shigella. In fact‚ many gram-negative bacteria cannot grow on SS agar. However‚ some enteric bacteria are able to grow on this medium‚ due to shared characteristics with Salmonella and Shigella‚ though their proliferation is limited. Both EMB and SS agars are also differential as they contain lactose‚ which causes indicator dyes in the media to
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The Effectiveness of Common Acne Products against P. acnes Bacteria Kathryn Henshaw Taunton High School Honors Chemistry I Mr. Osowick January 23‚ 2013 Table of Contents Abstract3 Background Research4-9 What is Acne Vulgaris? 4 How does Acne Vulgaris Form?6 How is Acne Vulgaris Treated?8 Purpose10 Hypothesis10 Materials10 Procedure11-14 Data15-16 Results17 Conclusion18-19 Figures20-22 References23-24 Abstract Acne is one of the most common pests to human beings. Although
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Academic Year 2012-2013. ABSTRACT Motility and chemotaxis play an important role in survival of bacteria by allowing them to move into an environment that is most favourable for growth. In this exercise‚ rate of migration was determined using Nutrient soft agar with the test organisms Pseudomonas aeruginosa‚ Erwinia carotovora and Staphylococcus aureus while demonstration of motility and chemotaxis was done by microscopic assay and capillary assay using chemoeffectors like malate‚ glucose and streptomycin
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| | | animals | Question 3 | | 1 / 1 point | In Pasteur’s swan-neck flask experiment‚ the importance of the S-shaped curves in the flasks was twofold. The curves allowed entry of air‚ and yet excluded ________. | | oxygen | | | nutrients | | | airborne bacteria | | | broth | | | heat | Question 4 | | 1 / 1 point | Pasteurization was first developed to kill ________ in wine. | | endospore-producing bacteria | | | all bacteria | | | disease-causing
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bacteria? a. flagella b. ability to persist in unfavorable environments c. selectively permeable membranes d. fast growth e. ability to sense chemical gradients f. peptidoglycan 3. (1 pt) Capsules‚ sheaths‚ and slime layers generally aid with a. nutrient transport b. cell attachment c. chemotaxis d. heat resistance 4. (1 pt) Penicillin controls bacterial growth by: a. preventing synthesis of the lipopolysaccharide layer b. inhibiting protein synthesis c. preventing cross-link formation in
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for their ability to metabolize many different organic nutrients‚ allowing them to be viable in multiple‚ diverse conditions. The Pseudomonas organisms had to initially be enriched from a soil sample
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throughout testing period‚ with stains‚ dishes‚ agars‚ and test reagents readily available. Lab procedures are considered orthodox and usage thereof is noted chronologically. 3/15/05 We obtained a 24 hour old stock broth culture of the unknown specimen 16. It appeared turbid‚ reflecting a substantial amount of growth. To determine that the stock culture was pure‚ we performed a streak plate using loops of the stock broth on a fresh dish of nutrient agar and then incubated it for 48 hours at Standard
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and hands (Sherwood‚ 2017). In addition‚ public places exemplified by hospitals‚ grocery stores‚ and schools present an environment‚ which promotes the growth of microbes. 2. Would you expect all types of microbes in your samples to grow well on nutrient agar at room temperature? Why or why not? The answer is no since microbes thrive well in different conditions.
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identified our unknown as Pseudomonas aeruginosa. Pseudomonas aeruginosa is Gram negative and rod shaped that we found to be motile in the lab. Our strain of P. aeruginosa formed colonies that were round in shape and had scalloped margins on nutrient agar. On our agar slant‚ the P. aeruginosa colonies had a filiform appearance on the edges. I think we correctly identified our unknown as P. aeruginosa because we performed several different tests‚ eleven of which helped us identify our organism on the
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Harley−Prescott: Laboratory Exercises in Microbiology‚ Fifth Edition Front Matter Preface © The McGraw−Hill Companies‚ 2002 PREFACE Take interest‚ I implore you‚ in those sacred dwellings which one designates by the expressive term: laboratories. Demand that they be multiplied‚ that they be adorned. These are the temples of the future—temples of well-being and of happiness. There it is that humanity grows greater‚ stronger‚ better. Louis Pasteur (French chemist‚ founder of microbiology
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