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Which bacterium showed some hydrogen sulfide precipitate after 24 hours? Would you expect this to increase or decrease after 48 hours? Explain.
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- You are given a mixed culture of 3 bacteria–Methicillin-resistant Staphylococcus aureus(MRSA), Escherichia coli and Enterobacter aerogenes. Assume that Escherichia coli can ferment glucose, maltose, sucrose and lactose and also produce carbon dioxide gas on fermenting these. Assume that Enterobacter aerogenescan ferment only sucrose and cannot ferment glucose, maltoseand lactose. Also on fermenting sucrose it produces hydrogen sulphide gas. Assume that MRSA does not ferment any of these 4 sugarsbut forms endosporesand is sensitive to penicillin. Also they all give similar looking white-colored colonieson an agar plate. Question:Generate pure cultures of these 3 bacteria using the following tools that you learned in the lab. Use any (some or all)of these toolsto generate pure cultures as well as confirm them. A) Any of Staining methods B) Special media plates(McConkey Agar or Blood Agar or Mannitol Agar plates) C) Fermentation media tubes(Triple Sugar Iron (TSI)or Durham tubes) D) Any…Which of the following species of microbe is associated withbeing a good indicator of fecal contamination and an extremelyversatile opportunistic pathogen?(a) Escherichia coli (d) Shigella dysenteriae(b) Campylobacter jejuni (e) Salmonella typhi(c) Yesinia enterocoliticaWhich of the following bacteria would be the most accurate indicatorof fecal contamination?a. Enterobacter aerogenes b. Thiobacillus acidophilus c. Escherichia coli d. Staphylococcus aureus
- t /g = (Log Nt – Log N0) /0.301 10 mL of a culture of Enterobacter at 104 cells/mL is introduced into 990 mL of the same broth at the same temperature (37° C) with adequate mixing. It is 8 p.m. the night before class on Tuesday at 11 a.m. Doubling time for this species is 40 minutes. Will the culture reach Stationary Phase before class?SIM media Give me the expected results (3 each) for Enterobacter aerogenes, Salmonella typhimurium, and Escherichia coli. Enterobacter aerogenes- Salmonella typhimurium- Escherichia coli-Coliform bacteria are common contaminants of meats. High coliform counts in food indicate the potential for finding which intestinal pathogens?
- Which parameter is generally less for a fixed dome type digester? Select one: a. Life span b. Excavation work c. Maintenance cost d. Temperature during winterWhich of the following bacteria that cause food poisoning produces enterotoxin?a) Campylobacter colib) Yersinia enterocoliticac) Bacillus cereus d) Shigella flexnerie) Salmonella enteritidisExplain why escherichia coli is frequently used for protein production and describe escherichia coli's limitations.
- Antimicrobial therapy can decrease the amount of susceptible bowel flora and allow proliferation of relatively resistant colonic bacteria. Which one of the following species can proliferate and produce a toxin that causes diarrhea?- a.Enterococcus species b.Staphylococcus epidermidisC.Pseudomonas aeruginosad.Clostridium difficilee.Bacteroides fragilisorrectly identify the bacteria based of the information provided: Cocci, Gram+, Catalase+, Facultative anaerobic Question 2 options: Streptococcus Enterobacter Vibrio Micrococcus NeisseriaAn asthmatic patient is prescribed a course of prednisolone 5mg enteric-coated tablets to take continuously at a dose of 45mg on starting day 1, but reducing every other day by 5mg until a dose of 5mg is reached for 5 days. How many tablets should be dispensed?