A student used cubes of agar jelly containing universal indicator, which changes colour at different pH. Five different sizes of cubes were cut from a larger block using a scalpel. • Cubes were placed in a beaker containing hydrochloric acid (enough to cover the cubes) and a stopwatch was started, • After 2 minutes the cubes were removed, rinsed with distilled water and blotted dry. • Acid absorbed at the outside continued diffusing towards the centre of the blocks. • The time taken for the blocks to turn entirely red was recorded. The results are shown in Table 22.1 on the insert. Length of one side of Surface Time taken to turn red (min) Cube area to agar cube volume Test 1 Test 2 Test 3 Mean (mm) ratio 1.20 6.4 2.9 5.4 4.9 10 0.60 14.8 15.5 14.6 15.0 20 0.30 30.6 28.3 27.4 28.8 D 30 0.20 44.1 42.2 43.0 43.1 40 0.15 58.7 60.1 57.4 58.7 Table 22.1 Whhal was Iie role ul the universal iridicalur in this expetiment?

Jack, a new MLT at Cape Fear Hospital was given the following information from a patient's urine sample which had been tested for the presence of S. aureus. The urine contained 6.4 x 107 CFU/ml S. aureus, the plate dilution was 10, and the sample had been taken from the 10-5 dilution tube. Calculate the number of bacterial colonies which must have been counted on the plate and what volume of the sample in µl that was actually plated to give the above results. PS, both of these values can be calculated.

Hello, please answer the following Microbiology question correctly. *If you solve the question CORRECTLY and I will 100% leave a thumbs up for you. Please do not give me an extremely long answer. Just follow the directions as such. Thank you. Question: 11) WHAT Microbiology TEST IS USED TO DETECT CONTAMINATED WATER? What is a positive? Describe the 4.

Hi, my question is 6 ml of urine is added to 30 ml of water. 0.1 ml is plated. 109 colonies form. What is the CFU/ml of the urine culture?