RATIO AND AGAR BLOCKS Conclusion: For this experiment the agar jelly had to be cut in to five different block sizes‚ after that has been done we had to add all five blocks in to the test tube with the acid and time to see how long it would take for the colour to change from a pinky purple to clear. From this experiment I learnt that the bigger the size of the jelly is the more time its going to take for the colour change to take place‚ the colour change represents the rate of diffusion‚ the smaller
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certain situations. Different samples of bacteria cultures were gathered from different places such as the mouth‚ shaded mulch‚ and from the table top. The samples were collected by using a cotton swab and swiped onto a petri dish filled with nutrient agar. The bacteria were then left to grow on their own in a relatively well shaded area. As a control‚ a cotton swab that had nothing on it was used. It was recognized that different types of bacteria exist in different environments and grow in different
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Materials • 30 petri dishes • Nutrient agar (a culture containing agar used to grow bacteria) • Sterile paper disks • Bacillus subtilis broth • Home-built incubator (a sealed box with a heat pad underneath) • Light box • Penicillin • Streptomycin • Tetracycline • Glutaraldehyde • 5 percent phenol alcohol • Fresh garlic extract Procedures 1. Divide petri dishes into six groups of five. 2. With adult supervision‚ melt the agar medium. 3. When liquid agar cools‚ pour an equal amount into each
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- 3 Petri dishes prepared with agar - 1 disinfected swab - 1 bottle of disinfected water - A piece of filter paper - A hole puncher - 4 test tubes - 1 measuring cylinder - 1 pipette with disposable tips - Tetracycline - Clindamycin - Benzoyl peroxide - 1 beaker of water - P. acne bacteria culture - 1 forcep - 1 digital weighing scale - 1 marker pen 1. Before starting the experiment‚ make sure you clean your work area with Chlorox and wear gloves at all
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Hypothesis: The hypothesis for this particular practical experiment is that‚ as the pH decreases or increases from neutral pH of approximately 7‚ the amount of microbial growth on the agar solution will decrease Materials: Agar Solution Preparation: *hand sanitizer/ hand wash soap *small container *1g of agar powder *0.25g of beef extract stock *60mL of heated water *electronic balance *small spoons (2x) *teaspoons (2x) *0.2M Acetic Acid Solution (pH of 3) *0.2M Sodium Hydroxide Solution
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active transport? What is passive transport? How is osmosis related to diffusion? How can we demonstrate active transport? How can we demonstrate Brownian movement? How can we demonstrate diffusion (2 ways)? How can we demonstrate osmosis (3 ways)? In terms of relationships between substances‚ how can we define “hypertonic”‚ “isotonic”‚ and “hypotonic”? What is the relationship between the size of a molecule and its rate of diffusion? ____________________________________________________________________________
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satisfactory method employed to evaluate the effectiveness of antiseptic agents against selected test organism. In this method‚ sterile filter paper disk is impregnated with an antiseotic and placed on fresh heavily inoculated agar plate of a test organism. Following incubation‚ the agar plate is looked for a zone of inhibition. The presence of a clear zone of inhibition surrounding the disk is indicative of inhibitory (antimicrobial) activity against the organism. This experiment deal with the evaluation
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alcohol solution‚ 1 Zip bag‚ 1 Pan to heat agar‚ 1 Isopropyl alcohol (rubbing alcohol)‚ 1 Cultures: S. epidermidis and L. acidophilus‚ 1 Gloves‚ Disposable‚ 1 Pencil‚ marking‚ 11 Petri dish‚ 60 mm‚ 2 Candles (flame source)‚ 1 Thermometer-in-cardboard-tube‚6 Test Tube(6)‚ 16 x 125 mm in Bubble Bag‚ 1 Test tube holder‚ 1 Test-tube-rack-6x21-mm‚ 1 Pipet Graduated Small (5 mL)‚ 1 Baker’s Yeast Packet – Saccharomyces cerevisiae‚ 1 Agar‚ MRS - 18 mL in Glass Tube‚ 4 Agar‚ Nutrient - 18 mL in Glass Tube‚ 1 Broth
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Contributors to Bacteriology In an unassuming way‚. they moved agar from the kitchen to the lab‚ revolutionizing bacteriology WOLFGANG HESSE T RANSLATED BY D IETER H. M. GR~SCHEL Walther Hesse was a well-known community health physician in the Kingdom of Saxony‚ a student of Max von Pettenkofer‚ the father of hygiene‚ and of Robert Koch‚ the father of medical microbiology. His American wife‚ Fanny Angelina‚ introduced agar-agar to the new science of microbiology. The Hesse Family Walther
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Lab Report - Microbes Aim: To investigate four areas of the school and to find out which of the four have the most microbes. Areas to Sample: 1. Girl’s locker room (Senior school) 2. Girl’s locker room (Elementary school) 3. Boy’s locker room (Senior school) 4. Boy’s locker room (Elementary school) Hypothesis: We predict that the boy’s locker room in the senior school will have the most microbes. First of all‚ there are more people using our locker rooms in the Senior School
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