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Why most you use deionized water rather than tap water in this experiment?
A- Tap water has many ions
B- Tap water has virus
C- tap water has pathogens
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Solved in 2 steps
- The MPN mostly looks to grow E. coli as the indicator species of fecal contamination. Most E. coli is not pathogenic, and you can get many more harmful things like viruses from fecal contamination. Why is E. coli the only thing we look for in the lab to determine whether water is contaminated with fecal matter? (like why not look for the viruses?)the scientist is studying the effect of water purification tablets on the creek water in her local area. She collected several different 2 L samples from a creek. For each sample, she measured the number of coliform group bacteria colonies in the water initially, and then added a water purification tablet and measured the number of coliform group bacteria colonies over time. She found that the following equation was a good fit to the data: C(t) = 80e−0.05t + 8(t + 1)−0.5.Her model says that C(t) is the number of coliform group bacteria colonies at time t, where t is measured in minutes since the tablet was added to the water. (a) According to this model, how many coliform group bacteria colonies would initially be in a 2 L sample of the water? background information: The quality of drinking water is determined by tests for coliform group bacteria, which are organisms found in soil and in the intestinal tract of warm-blooded animals. Coliform group bacteria are not considered to…The number of bacteria in culture increases rapidly. The table below gives the number of bacteria a few times (in hours) after the moment when. (a) Find the average rate of change for the number of bacteria from 0 hours to 3.1 hours. (b) Find the average rate of change for the number of bacteria from 6.2 hours to 15.5 hours.
- What is minimum amount of time one much wash his or her hard to kill microbes? A. 1 second B.60 seconds C.20 seconds D. 10 secondsYou obtain a 1 mL sample of contaminated drinking water in order to calculate the number of fecal bacteria in the water. The 1 mL sample is diluted into a first bottle with 99 mL of sterile saline. One mL from the first bottle is transferred into a second bottle of saline containing 9 mL. Finally, 1 mL from the second bottle is transferred to a third bottle with 9 mL of saline. You create two spread plates from the third bottle: plating 0.1 mL results in 106 colonies, while plating 1 mL results in 562 colonies. How many fecal bacteria per mL are in the drinking water? This is a homework assignment, and I am struggling to do this correctly. Thanks for your help.A culture starts with 8600 bacteria. After 1 hour the count is 10, 000. A. Find a function the models the number of bacteria after t hours B. Find the number of bacteria after 2 hours. C. After how many hours will the bacteria count double?
- Which of the following prevented an aerotolerant anaerobic, mesophilic and halophilic bacterium from contaminating your home aquarium? the water was at 37ºC you placed a high amount of glucose into the aquarium you placed several pennies in the aquarium you were using a .45 um filtering unit you placed carbon dioxide instead of oxygen into the aquariumMicrobes can be used to decrease the use of chemical fertilizers & pesticides. Explain how can this be accomplished?The average time a molecule spends in its reservoir is known as ________. a. residence time b. restriction time c. resilience time d. storage time
- Why do raw household ingredients such as granulated sugar and cooking oils never go bad in normal conditions? Extrinsic factors (room temperature) These foods have a very low Aw ph of these ingredients is too low to support spoilage organisms They do spoilColey’s Toxin is really: a mix of harmless viruses. a mix of pathogenic bacteria. a mix of random organisms taken from sick individuals. a mix of microbes from the soil.The iCHIP allows scientists to: grow bacteria in the natural environment. grow large numbers of a bacterial species and harvest large amounts of antibiotic. grow viruses effectively. grow a single diverse biofilm to later be tested in the lab.